The user wants an SVG animation of a man drawing a compound bow and releasing an arrow. Requirements:

This is a browser-openable deliverable (SVG animation in HTML), so I should use the website_version_manager tool. Let me think about this carefully.

A compound bow has distinctive features:

The physics of drawing a compound bow:

For the animation, I need:

This is a complex SVG animation. Best approach: HTML page with SVG, use CSS/SMIL animations or JavaScript-driven animation for precise control. JavaScript gives the best control over the cam rotation, string path, limb flex, etc.

Actually, for perfect control, I could compute the string path as a function of draw length. Let me think about the geometry:

Compound bow geometry (side view, bow held vertically):

At rest (brace): string is relatively close to the grip (brace height ~7 inches) At full draw: string pulled back ~28-30 inches, arrow point near the rest

For the animation phases:

Key details for realism:

Given "特写镜头" (close-up shot), the framing should be tight on the bow — maybe we see the archer's bow hand, grip, the full bow vertically, and the drawing hand/face partially at the edge.

Let me design the coordinate system:

Cam mechanics simplified:

For visual purposes, I'll draw:

The archer:

Animation implementation: JavaScript with requestAnimationFrame, phase-based timeline, parametric functions for:

Let me carefully compute string path.

Simplified cam model:

At brace: nock point is on the string between cams, nearly straight line (string lies close to the line connecting cam tangent points).

So the string path as polyline: topCamTangent → nockPoint → bottomCamTangent. When at rest, nockPoint ≈ on the line.

Limb flex: limbs bend toward the shooter (rightward) as drawn... actually limbs bend such that limb tips move toward each other and slightly toward the archer? No — when you draw a bow, limb tips move toward the archer's hand (the string pulls the cams back/inward). The tips move inward (toward riser center) and toward the archer. For a vertical bow: top limb tip moves down and back (right), bottom tip moves up and back (right).

For the SVG, I can rotate/flex the limbs via path morphing computed in JS: limb as quadratic curve from riser end to cam axle, control point offset increases with draw.

Cam rotation: rotate cam group by angle θ(d). Also the cable positions.

Let-off visualization: at full draw, cams hit stops — maybe show a small "valley" — hard to show visually beyond rotation. Fine.

Release dynamics:

Timeline (total ~8s loop? or play once with replay button):

Better to loop automatically with a replay button and maybe a phase label + slow-mo option? Keep it clean: auto-play, loop, and a small control bar (play/pause, replay, speed 1x/0.5x/0.25x). A slow-motion toggle would really help "完美还原放箭瞬间" — add speed control. Also maybe phase captions in Chinese: "开弓", "满弓/靠位", "撒放", "箭矢离弦", "随势".

Add a slow-motion "release moment" emphasis? Could auto slow during release on first play? That complicates. Just provide speed selector including 0.25x, plus a timeline scrubber? A scrubber is nice for examining the release moment frame by frame. Let me add: play/pause, replay, speed (1x/0.5x/0.25x), and a progress bar scrubbable. That's genuinely useful and not too complex.

Now the drawing details. Let me set up geometry.

ViewBox: 0 0 1280 800.

Bow setup:

Actually let me reconsider: bow center (arrow nock point at brace) should be around y=400. Grip slightly below arrow. Riser from y≈180 to y≈620. Limb pockets at y≈240 and y≈560. Axles at y≈150 and y≈650 at brace. String at brace roughly straight line x≈390 (string plane slightly behind grip? Brace height: string is BEHIND the grip (toward archer). If archer is on the right, string is to the right of grip by brace height ~60-70px). So string plane at brace x≈500, grip at x≈430. Cam axles at x≈425. Cams sit at limb tips; string wraps cams; free string from cam edge to nock.

Full draw: nock pulled to x≈780 (draw length ~28in * scale ≈ 280px). Arrow at full draw: point near rest (arrow length ~30in ≈ 300px), so arrow spans from nock x=780 to tip x≈480. At brace (release end), nock at x≈500, tip at x≈200. Then free flight continues left.

Cam geometry: each cam ~ radius 34px, with an axle hole offset. Modern dual-cam: both cams identical, elliptical. Draw cam as a path: outer track circle-ish with a groove, plus inner detail, module screws, axle. Rotation angle: at brace θ=0; at full draw θ≈-160° (top cam rotates one way, bottom the other). Cable: control cable runs from top cam to bottom cam too (in dual cam, string and buss cable cross). Visually: string (thicker, served center) from top cam outer track → nock → bottom cam outer track; cable from top cam side → cable slide → bottom cam side, crossing? In a dual-cam bow, each cam has a string track (outside) and cable track (inside); the cables run from one cam's cable track to the other cam's axle/cable track, passing through the cable guard/slide offset to the right (toward archer side) so the arrow passes cleanly.

Simplify: draw two cables from top cam to bottom cam offset x≈+45 (behind string plane), passing through cable slide which sits on cable guard rod mounted on riser. Cable slide moves along rod during draw (at full draw slide moves toward string? Actually cables pull the slide toward the string as cables are drawn). Cable guard rod: from riser at grip level, extends back-right ~40px, parallel to string plane. Slide at its far end holding both cables.

At draw: cables tension more, slide pulls toward string plane (left) slightly. I'll animate slide x slightly and cables bending? Cables stay straight between cams passing through slide ring — at brace cables are straight top-cam→bottom-cam through slide point which is near that line; at full draw, cams rotate taking up cable, and the cable contact points shift. For visual: keep cables straight segments topCam→slide→bottomCam, with slide slightly moving. Good enough.

String on cams: free string segment endpoints = tangent points on cam circles. Since nock point and axle positions known, approximate tangent from nock to cam circle: compute tangent lines from point to circle. That's doable in JS: given external point P and circle (C, r), tangent points. The string also wraps the cam from tangent point around to its anchor — I'll draw the cam disc itself covering the wrap, plus draw string arc along cam circumference from tangent to anchor point for realism (arc on the cam rim). The wrap arc length changes with cam rotation: anchor point rotates with cam. Nice detail: draw arc from tangent point along rim to anchor (anchor = fixed angle on cam, rotates with θ). At full draw more of the string is unwrapped → free segment longer... visually the arc shrinks. Good.

Also the peep sight: small ring on the string above center, moves with string? The peep sits in the string at a fixed position along the string's length (between strands), so at brace it's near center-ish (actually at eye level when at full draw anchor). At brace, string is straight, peep at some position above nock; at full draw, string is V-shaped, peep ends up near the archer's eye. Compute peep position as a point at fixed fraction along string path from top. With serving: string has center serving around nock.

D-loop: small loop of cord at nock point, tied above/below arrow nock; release aid clamps it. D-loop ~15px. The release aid: small caliper head + wrist strap on drawing hand.

Archer figure (profile, facing left):

Colors: outdoor background — soft blue sky gradient, distant blurred treeline/forest green, sunlit. Background out of focus (use slight blur on bg layers) to emphasize close-up. Ground line low or out of frame. Add subtle bokeh circles for realism. Depth-of-field feel: bg blurred (SVG filter feGaussianBlur on bg group).

Bow colors: camo or matte black riser + camo limbs (e.g., green/brown camo pattern via pattern fill), cams anodized (e.g., black with colored accents, or camo). Modern: black riser, camo limbs (let's do Mossy-Oak-ish camo pattern with irregular blobs). String: dark green/black with serving. Sight: black housing with bright pins (green/red/yellow fiber dots). Stabilizer: black with weights, maybe camo. Quiver with arrows? Maybe skip quiver to reduce clutter; or include a small 5-arrow quiver hood on riser top — adds realism but occludes cam. Skip quiver; keep focus on mechanics.

Arrow: carbon black shaft with cresting (colored band), white/colored vanes (e.g., 2 orange +1 white — in profile see 2), green nock (lighted nock? no), aluminum insert + field point (steel point). Arrow spine label text maybe.

Now, physics numbers for the timeline (use t in seconds):

drawLength d(t):

Arrow motion:

Speed lines / motion blur on arrow during flight: draw semi-transparent elongated gradient behind tip? Simpler: add 3 short white streak lines at tip region while in fast flight, fading.

Also string serving blur? skip.

Cam rotation function: θ(d) = -170° * (d/D) with slight nonlinear (cams rotate fast early, roll over at end — actually they rotate ~linearly then hit stops). Use θ = -170 * smooth-ish(d/D). Draw stops contact near end: add tiny cam "stop" peg drawn touching limb at full draw? Detail skip or small.

Limb flex: limb tip (axle) moves: at brace top axle (425,150); at full draw axle moves to (455, 195) — down + back. Define axle position = lerp along an arc. Similarly bottom mirrored. Also limb curvature: draw limb as path from pocket with bend increasing. And limb tip angle changes (cams tilt toward string). Cam rotation + position lerp gives most of it; limbs drawn as tapered curves from pocket to axle with slight S-curve flex.

Cable slide: at brace slide at (545, 400)-ish? Cables from top cam rear tangent (~(455,150)) to bottom (~(455,650)) pass through slide ring at x≈470? Hmm cables offset behind string plane by cable guard ~25-40px: slide at (505, 400). Cable guard rod: mounts on riser at (~(470, 430)) extending right/back to (510, 430)? The rod usually angles back from riser near grip. Slide rides along rod; during draw slide moves toward string (left) by ~10px as cables tighten.

Peep: on string between center strands; position = point at param s along string path measured from top tangent, s chosen so at full draw peep lands near eye (~(860, 455)). Compute: at full draw string path: top tangent (~(455,160)) → nock (780,400) → symmetric. Length top→nock = sqrt(325² + 240²) ≈ 404. Eye at (865, 450): along from top toward nock: direction (0.804, 0.594); to reach y=455: t=(455-160)/240404 ≈ 496?? that's beyond nock (404). Hmm eye higher: peep at y≈445: still >404. So peep can't reach eye if eye below the line... The peep at full draw is between eye and sight — it should be right at the eye. Let me instead place anchor/eye so that peep on string at fraction f=0.85 of top→nock lands at eye height. point = top + 0.85(nock-top) = (455+0.85325, 160+0.85240) = (731, 364). So eye ~ (745, 360)?? Eye is above nock (arrow at 400) by ~40px — realistic (eye above arrow). But the draw hand anchors below jaw; peep aligns with eye which is above hand. Eye at (740, 355), nock at (780,400), hand at (795, 415), jaw around (810, 380)?? Face geometry: eye above and slightly forward of jaw corner. Head center ~ (900, 380): eye at (830, 360), nose at (815,390) pointing left, jaw corner (835, 415), ear (880, 365). Hmm profile facing left: forehead left-top, nose protrudes left, lips, chin, jaw back to ear. Eye ~ (845, 350). Peep should be ~10-20px in front of eye: peep at (830, 355). Distance peep→eye tiny is fine (close-up).

So at full draw: nock point (780, 400); peep at param such that peep ≈ (830, 355)? But peep is ON the string which goes top tangent → nock. At full draw the string V: from (455,160) to (780,400) to (455,640). The upper segment passes near the face. Points on upper segment: parametrize from top: (x,y) = (455 + 325u, 160 + 240u). For y=355: u=0.8125 → x=719. So peep at (719, 355), eye at (745, 350) — peep ~26px in front of eye.

Then head: eye (745,350). Profile: forehead up-left, skull back to x≈860, chin/jaw: jaw corner at (790, 415)?? hand anchors at jaw corner: hand at (795, 420), knuckle touching jaw at (785,412). Nock at (780,400) right under hand ✓. String continues from nock down — lower string segment passes near chest — fine.

Nose at ~(735, 375)? Nose tip leftmost ~ (730, 378). Hmm the string at nose height y=375: u=(375-160)/240=0.896 → x=746. Nose at 730 is left of string → string would touch nose — actually at anchor string touches nose tip lightly (common reference). Put nose tip at (748, 378) touching string ✓ nice realism.

Cap brim pointing left at forehead (y≈320), shading eyes slightly. Sunglasses? Optional; maybe clear glasses or none. Add slight beard stubble? Keep clean-shaven, focused expression, eye looking through peep toward sight (left).

Sight: mounted on riser front (left side of riser) at arrow height: housing ring at (385, 395) radius ~28, pins extending from top with colored dots at different x (different distances... pins are horizontal positions for distances: 20,30,40,50,60 yd — dots at varying heights). In profile we see the housing ring edge-on?? A bow sight housing is a ring whose plane is vertical facing the archer; from the side (profile view) you'd see it edge-on as a thin ellipse. Hmm — but for the close-up to look good, showing the sight ring face-on would require an over-shoulder angle. Compromise: draw sight slightly angled (3/4 view): housing as ellipse (rx=30, ry=34) mounted on dovetail arm from riser, pins as short horizontal bars with fiber dots visible inside. A slight 3/4 perspective for the whole bow? That complicates string geometry. Keep bow strictly side-on; sight housing drawn as narrow ellipse with 5 pin dots + level bubble; it's recognizable.

Actually many hunting sights: pins are vertical posts with dots, arranged so dots at different heights within ring. Side view: you see the pin blades edge-on (thin horizontal lines) with dots facing archer (not visible from side)... From pure side, sight is mostly a thin profile. To keep realism yet readable: draw housing as a circle seen at slight angle (ellipse rx 10, ry 30) with fiber optic dots glowing (they're bright even from side slightly). Fine — close-up viewers will recognize. Also add a small bubble level at bottom of housing.

Stabilizer: from riser front at grip level extending left-forward and slightly down: from (420, 450) to (310, 470), rod with 2-3 weight discs at end + dampener. It also reacts on release (slight bounce) — animate stabilizer tip oscillation after release (damped sine, small).

Arrow rest: whisker biscuit at (455, 400): ring with bristles radial inward; arrow passes through center. In profile: draw as ring (donut) around arrow + few bristle strokes. During flight arrow passes through it (at brace, tip still inside; fully leaves when tip passes x≈455). Arrow leaves BOW when nock passes rest?? Actually arrow is "off the string" at brace; it passes through rest and fully clears bow when its nock clears... define visual: arrow fully exits frame left eventually. The moment "箭矢离弓" (arrow leaves bow): tip clears rest around when nock at ~ x≈460?? arrow length 300: tip at nock-300. Tip at 455 when nock at 755 — that's DURING draw. At release from brace: nock starts at 500 (tip at 200, already past rest). So the arrow tip is already past the biscuit at brace... The arrow leaves the bow effectively when nock passes the rest (x_nock < 455)? Hmm. Real sequence: at brace, arrow tip sits just ahead of rest (broadhead ahead of riser). Full draw: tip pulled back to near/behind rest. On release: string pushes arrow until brace, arrow moving fast, tip exits biscuit quickly, nock follows; the arrow is fully free once nock passes the rest region (~a few inches after brace). For animation: at brace nock at 500, tip at 200 (tip already 255px left of biscuit at 455 — that's fine, shaft still passes through biscuit until nock < 455). Arrow "clears the bow" at nock x = 455, shortly after brace. Add a tiny vane-biscuit interaction wiggle? Keep simple: no.

Fletching: 3 vanes, in profile see 2 (one up-ish, one down-ish at 120° offsets) — draw as small parallelogram fins near nock, offset heights, helical twist slight. Also nock (small green piece) and D-loop above/below.

Grip/hand detail: bow hand (left hand) at grip: thumb & fingers relaxed around grip, sling on wrist (wrist sling is a realism detail — compound archers use wrist slings). Draw hand (right): mechanical release in hand, wrist strap. At release: trigger finger... release aid trigger pressed by thumb/index — on release, caliper opens, D-loop free, hand stays at jaw then drifts back slightly (follow-through). Animate: at t=4.6, D-loop detaches from release, hand remains; string/arrow go.

Release aid drawing: small caliper (jaw) at D-loop, shank to wrist strap on right wrist. After release, draw tiny open jaw. Keep simple: release head rotates slightly + D-loop leaves.

Bow hand after release: bow jumps slightly forward-left then settles (with stabilizer, jump is mild). Animate whole bow group translate x -3px quickly then damped back, plus tiny rotation. Follow-through.

Breathing: pre-draw and hold phases: subtle vertical bob of torso/arms (±1.5px, slow sine).

Now, sound? No audio needed.

UI: title bar "复合弓撒放特写 · Compound Bow Release", phase caption overlay top-left changing per phase, controls bottom: play/pause, replay, speed select, scrubber. Also a "慢放撒放瞬间" quick button that jumps to 4.4s at 0.25x. Nice touch.

Implementation: single HTML file with inline SVG + JS. Use requestAnimationFrame loop with clock; state machine by time t (loop total ~9s, then pause at end? Loop with 1s rest). I'll make it loop seamlessly: after 8.5s, reset to 0 with brief fade? Better: loop continuously (arrow reset via fade? Arrow teleport is jarring). Option: at end hold 1.2s then fade to start frame over 0.4s. Acceptable.

Alternatively play once and stop with replay button + auto-loop toggle. I'll auto-loop; most users fine.

Total duration: let me re-time: 0–1.0 idle (breathing) 1.0–3.4 draw (2.4s) 3.4–4.8 hold/anchor (1.4s) — add aiming settle: sight pin micro-movement 4.8 release (fast return 0.26s) → brace at 5.06 5.06–5.9 arrow flight + follow-through 5.9–7.5 settle 7.5–8.2 fade & loop

Caption text per phase:

Also a small info panel? Maybe side annotations that appear at phases: e.g., during full draw show "峰值拉力已过 · 省力比 ~75%". Keep captions concise.

Camera: "特写镜头" — frame tight. Maybe add subtle camera: slight zoom-in during draw (scale 1.0→1.06) pushing into the bow, then at release a quick 2px shake. Subtle. Implement via transform on root group. Zoom center on bow center (~(500,400)).

Let me now write the code. Single index.html in /tmp, then serve? For website delivery: build a small project? The website_version_manager handles plain HTML pages. I'll create /tmp/bow/index.html (single file), maybe that's enough; then build_version. Let me check the skill for webapp? This is a single HTML page — no need for React. The guidance: website delivery tool covers plain/single-file HTML pages. I'll load mshtools-website_version_manager at start. Let me also consider using the webapp-building skill — it says "Read this skill before starting any frontend or full-stack project". A single-file SVG animation HTML is arguably a plain page; webapp-building is for React apps. For efficiency, single HTML file is right. I'll load version manager tool and save version at end.

Now detailed SVG structure plan (ids, groups):

<svg viewBox="0 0 1280 800"> defs: gradients (sky, skin, metal, camoPattern, stringServing, arrowCarbon, lens), filters (bgBlur, softShadow), markers none.

Layers:

Bow hand only matters near grip: string at brace x=500 vs grip 430 — 70px apart, they don't overlap anyway. Draw hand at jaw overlaps string → draw hand before string. Simplest: draw order: 1 torso 2 bow arm (to grip) 3 head/neck/cap 4 draw arm (shoulder→elbow→wrist at jaw) 5 bow (riser, limbs, cams, cables, guard, accessories, arrow, arrow rest, sight, stabilizer) 6 draw hand + release aid 7 string + D-loop + peep 8 bow hand + sling Wait, string should connect to cams — string drawn after cams is fine visually (string over cam edges, ok since string wraps in front? string sits in cam groove, edge-on to viewer; overlay fine). Also cables: cables are behind string plane (offset right) — draw cables with bow (5) but they'd be under string (7) ✓. Cable slide overlaps arrow? Arrow at y=400 passes above guard rod; ok.

Arrow must be under rest ring? Rest (biscuit) ring around arrow — draw biscuit after arrow so ring surrounds (bristles over shaft slightly). Put rest in group 5 after arrow. Sight in front of riser ✓.

b. foreground vignette? maybe subtle.

Now geometry functions in JS:

const B = { brace: {nockX: 500, nockY: 400}, D: 280, // draw px topAxleRest: {x: 428, y: 150}, botAxleRest: {x: 428, y: 650}, topAxleFull: {x: 470, y: 200}, botAxleFull: {x: 470, y: 600}, camR: 34, grip: {x: 430, y: 432}, };

k = d/D (0..1). axle positions = lerp. Cam angle θ = -160° * easeCam(k)? linear is fine: θ = -150k (top), +150k (bottom mirrored sign? Both cams rotate same visual direction? For symmetric dual cam with string drawing center: top cam rotates clockwise (seen from this side), bottom counterclockwise? Think: string pulls cams' contact points toward archer; both cams rotate such that string unwraps... top cam: string leaves top of cam going down-back; drawing rotates top cam clockwise. Bottom cam: string leaves bottom going up-back; drawing rotates bottom cam counterclockwise. In screen coords (y down), top cam rotation: negative angle? I'll just pick signs so the wrap arcs shorten as drawn — visually verify mentally: anchor point on cam rim rotates toward the string side. I'll set top θ = -150k°, bottom θ = +150k° (SVG rotation positive = clockwise since y down). Try: top cam anchor initially at angle pointing toward nock side; rotate by -150 (counterclockwise in standard math but screen...). I'll just implement and eyeball via screenshot with browser tool. Good — I have browser tools to screenshot and iterate! Definitely do that: render, screenshot at several times, adjust.

String path:

Cables: from topCam cable anchor (rotates with cam; at radius camR*0.55 on inner side) through slide point S=( sx, 400+... hmm two cables: control cable top→bottom. Draw each as path M topCablePt L slideTop L ... Actually simple: two lines top→slide, slide→bottom, slight different slide holes (y 390, 410). Slide x = 512 - 18k (moves toward string during draw... cables pull slide forward(left) — actually cables get tighter angle; slide slides along guard toward bow(left)? The cable slide moves toward the string as cables are drawn: x decreases? Cable guard points back; as you draw, cables angle pulls slide toward string plane (left). sx = 505 - 12k. Cable endpoints on cams rotate with θ at radius r2=20, base angles chosen.

Cable guard rod: from riser back face at (455, 445) line to (520, 425)? Rod angles back-up slightly. Slide group at (sx, ~415-430) with two ring holes at y 412 & 428. Arrow at y=400 clears above ✓ (real bows: arrow above cables ✓).

Peep: position on string at fraction fp of polyline length from top tangent (fp chosen so at full draw near (719,355)). Compute at k=1: length top→N = 404; want u=0.8125 → fp = 0.8125*404 / totalLen(top→N→?) peep is on upper half: fp relative to upper segment length only; compute position by walking from top tangent along upper segment by s=fp0 * segLen where fp0=0.80 constant. At brace upper segment = top→N straight (nearly): s=0.8 * len((455?,150)-(500,400))... brace top tangent ≈ (462? ...). Fine, peep sits slightly above center at brace ✓ (real: peep above nock at brace? Peep is at eye level at full draw; at brace it sits above the nock point on the string ✓).

Draw peep as small ring (r=5) rotated to string angle, with 2-3 strand lines of string splitting around it (draw string as double line near peep: two thin strands merging). Simplify: at peep, draw tiny ellipse ring over the string + short parallel strand lines. Good enough.

Serving: string center served (thicker, different color) around nock ±40px along path. Draw as thicker stroke segment along path near nock. Implement: second path same d, stroke wider, stroke-dasharray to show only near middle? Easier: compute two points along path at ±45px from nock, draw path topT→p1, p1→p2 (serving, wider lighter), p2→botT? I'll construct path pieces manually via point-along-path helper (my own polyline walker). Doable: stringPts = [topT, N, botT]; function pointAt(dist). Serving from len/2-45 to len/2+45. Also upper serving near peep (string served where peep tied: small segment ±18px around peep).

D-loop: two short cords from string just above & below nock (offsets ±14px along string direction at nock region) to a knot point behind N (toward archer ~18px). At full draw D-loop knot at (798,400) where release jaw grips. On release, D-loop stays with string (it snaps forward with string) ✓ (it's tied to string). So D-loop moves with string always; release detaches at t_release: caliper opens, stays with hand.

Release aid: wrist strap on right wrist (~(870,455) at full draw), rigid shank from strap to head at D-loop knot: draw line + small caliper shape (two tiny jaws). At release, jaw opens (rotate small line) and shank stays with hand; add tiny gap between caliper and D-loop knot afterwards.

Hands:

Let me set concrete: S=(1005, 452). W_full=(802, 420). mid=(903,436), dist=sqrt(203²+32²)=205.5. Want elbow E ≈ (1000, 405): |S-E|=sqrt(5²+47²)=47?? upper arm only 47px=4.7in — too short. Real proportions: at anchor, upper arm (shoulder→elbow) points back-and-slightly-up, forearm forward to jaw. upper arm ~12in=120px: E = S + 120*(dir back-up) = (1005+115, 452-35)=(1120, 417). forearm |E-W| = sqrt(318² + 3²) = 318px=32in?? too long. Total 120+318=438px=44in — arms aren't that long (~28-30in total). Contradiction with jaw anchor at x=802 while shoulder at 1005: distance 205px=20.5in with arm 30in → elbow offset = perpendicular h = sqrt(150² - 102²)=110px. So elbow ≈ mid + 110up-back perp. Elbow ≈ (903 - 17?, 436-109) with perp up = (dy,-dx)... S→W dir = (-0.988, -0.156); up-perp (pointing up, i.e., -y) = (-0.156, 0.988)?? That has +y. Choose perp = (0.156, -0.988): E = (903+17, 436-109)=(920, 327). Elbow at y=327 — above head?? head top ~300. Real photos: at full draw the draw elbow is roughly at ear/shoulder height, NOT above head... because draw length includes chest depth: hand at jaw which is in FRONT of shoulder by chest depth? In pure side view, jaw is roughly above/forward of shoulder: shoulder joint under ear-ish, jaw corner ~ 4-6in forward of shoulder joint → W_x ≈ S_x - 60. And draw length: nock at jaw; bow at draw length from nock. So W=(S_x-60, 420), S=(1005,452): dist=sqrt(60²+32²)=68px; arm 300 folds hugely: h=sqrt(150²-34²)=146 → elbow = mid+146perp. That gives elbow way high/behind — but anatomically elbow can't fold that way; real anchor: elbow ~ horizontal with shoulder, upper arm along line to elbow behind shoulder: E≈(1090, 440)?? |S-E|=85px=8.5in — upper arm ~ 8.5in plausible (humerus ~13in=130px... hmm 10px/in might over-scale body).

I think the issue: my bow scale (10px/in) makes body huge. Body: shoulder width ~18in=180px, head ~9in=90px tall. That's fine actually. Human arm: shoulder→wrist ≈ 24in=240px (upper 12 + fore 11 + hand). At full draw side view: hand at jaw (x = S_x - 55), elbow: upper arm points BACKWARD from shoulder nearly horizontal, elbow at (S_x + 130, S_y - 10) = (1135, 442); forearm from elbow to wrist: dist = sqrt((1135-950)² + (442-420)²) = sqrt(185²+22²)=186px=18.6in — forearm+hand ~ 15-17in real... close-ish. It means elbow sticks out behind (x>S_x) — YES that's correct form! Draw elbow behind the line, roughly at shoulder height, pointing back. In profile you see elbow behind torso. Slightly reduce: E=(1120, 438). forearm 176px=17.6in ok-ish. Total arm 130+176=306... fine for stylized.

So: no IK needed; keyframe the elbow:

So use 2-bone IK, L1=127, L2=184, branch = "elbow back" — but which branch at setup? Setup: W0=(534,410), dist=318: a=(127²-184²+318²)/(2318) = (16129-33856+101124)/636 = 131.1; h=sqrt(127²-131²) negative!! L1+L2=311 < 318 ✗. Just extend: allow L to stretch: if dist > L1+L2, use straight-line arm with elbow at L1/(L1+L2) along. 318 vs 311: stretch factor 1.02 — invisible. Set L1=135, L2=195 (330) to be safe: full draw: a=(135²-195²+68²)/(136)= (18225-38025+4624)/136 = -111.6, h=sqrt(18225-12455)=76, E = S + adir + hperp = (848+88, 458+68)+(760.61, -760.79)=(936+46, 526-60)=(982, 466) — elbow back 134 at shoulder-8 ✓ good. Setup: a=(18225-38025+101124)/636=127.8, h=sqrt(18225-16333)=43.5, dir=(W-S)/318=(-0.987,-0.151), perp=(0.151,-0.987)?? branch: E = S + adir ± hperp. S+127.8(-0.987,-0.151) = (848-126, 458-19)=(722,439). ±43.5*perp: choose (dy,-dx)? dir=(-0.987,-0.151): perpA=(-dy,dx)=(0.151,-0.987): E=(722+6.6, 439-43)=(729,396) — elbow slightly up; perpB=(dy,-dx)=(-0.151,0.987): E=(715,482) elbow down ✓ natural for setup (arm relaxed down). So branch flips between setup (down) and full draw (up) — the elbow RAISES during draw ✓ real! Implement branch blend: elbowDir angle interpolates from down to up as k increases? The IK two-branch jump is discontinuous. Instead: drive elbow by explicit keyframes (artistic control): define elbow as function of k: E(k) = lerp between E0=(730, 492) (k=0, soft down), E0.5=(870, 480), E1=(982, 464) (k=1, back at shoulder height). And wrist W(k) = nock + (14, 16) = (532+... nock(500+d,400): W=(514+d, 416). At k=0 W=(514,416); at k=1 W=(794,416). Wait earlier said W0=(534,410) — offset (14,16) gives (514,416): hand at release-grip position: release head at D-loop (518,400), hand fist below-right ~(520,420) ✓ ok offset (6,20)? Fist center ≈ (524, 422). Use W = N + (10, 22). k0: (510,422) k1: (790,422). Hmm anchor: hand under jaw: jaw corner (790,412) — hand at (790,422) ✓.

Arm drawn as: path S→E→W with muscle thickness (stroke-linecap round, two strokes: outline dark + inner skin/shirt). Upper arm: shirt sleeve (short sleeve → upper arm clothed to mid, forearm skin). Draw: sleeve from S to mid-upper-arm (shirt color), rest skin. Simple: two segments with different colors, widths ~34/26.

Torso: from right edge: chest/shoulder shape: path covering x>860 region, y 430-650, with shirt (camo?). Since close-up, show upper chest & shoulder hint: polygon from (870,470) to (1030,450) etc. Also chest guard? skip.

Head details (profile facing left), skin tone #d9a178 with shading:

String touches nose tip at full draw: nose tip at (733,372); string at y=372: x = 455+325u, u=(372-160)/240=0.883 → x=742. Nose tip at 733 < 742 → string behind nose tip?? string should touch nose: string x at 372 = 742 means string passes at 742; nose tip at 733 is LEFT (in front) → no touch. Move nose tip to (742,372): touches ✓. Adjust face: nose slightly more prominent? It's fine—profile nose at x≈742.

Peep at u=0.80: (715, 352); eye at (762,358): peep 47px in front of eye — a bit far but fine; make fp=0.86 → (735,366)?? y=160+240*0.86=366, x=455+279=734: peep (734,366), eye (762,358): peep in front-left of eye ✓ 30px away. But peep should be at eye height and close to eye; nose at (742,372) would collide with peep (734,366)!! Peep ON string; string at y=366: u=0.858→x=734. Nose tip (742,372) is right of that point?? x=742 > 734: nose crosses string line?? String at nose-tip y=372: x=742 = nose tip exactly touching ✓. Peep at (734,366) is 8px from nose tip — too cramped; move peep up: fp=0.82 → y=357, x=721. Peep (721,357), eye (762,358) same height ✓ 41px ahead — okay stylized (real peep ~5-10cm from eye; 41px=10cm ✓ actually perfect!).

Sight pins alignment: during hold phase maybe show tiny "aim" oscillation.

OK. Also the arrow at full draw: nock at (780,400); tip at (780-300, 400)=(480,400)?? Arrow length 300 → tip at 480 — tip is BEHIND rest (455)?? At full draw tip should be ~ at/just behind rest (broadhead safety: tip near rest). Tip at 480 is right of rest 455 by 25px — slightly behind rest ✓ plausible (draw length slightly long). Good visual: at full draw the arrow barely pokes past the riser.

At brace: nock 500, tip 200: tip well past riser front (riser ~430) ✓ normal.

Arrow components: shaft (black carbon w/ subtle cresting band near front), insert+field point (silver conical), vanes near nock: 3 vanes at 120°, in side view: draw two visible: one up-back, one down-back, plus hint of third as centerline ridge. Vanes: length 36px, height 9px, parabolic shape, color: two orange, one white (cock vane). Helical offset slight. Nock: green, small cylinder + throat.

Fletching position: vanes from nock-8 to nock-44.

During flight: arrow drawn with slight flex curve (bend perpendicular amplitude a(t)): path quadratic: M tip Q mid+bend nock. Bend oscillation: a = 3*sin(ω(t-tb))*exp(-6(t-tb)) for t>tb, plus during powered push (release→brace) a=2.5 constant-ish wiggle.

Speed streaks: during t in [4.8, 5.35], draw 4 lines near tip trailing right, opacity fading.

Also arrow shadow on ground? Ground out of focus far below — skip.

Cam detail design (drawn as group per cam, rotated by θ, translated to axle pos):

Wait, cams on far side vs near side: side view shows near-side cam fully ✓.

Limb design (split limbs): two parallel limb strips per end, drawn as one tapered shape for simplicity (side view merges them — side view of split limbs shows one strip edge-on... side view shows the limb from its side: a tapered bar). Draw limb as tapered curved bar from pocket to axle fork: path with varying width 26→16, camo fill. Flex: control point shifts. Draw as filled shape: compute centerline points: pocket P0=(438? ...) Let me define: top pocket at (436, 252) angle ~ -80° (nearly vertical, slightly forward(reflex) ). Limb centerline: from pocket to axle, quadratic with control offset flex(k): at brace slight curve (preload), at full draw more bend. Draw centerline as polyline, stroke with width tapering? Strokes can't taper; use filled path: build ribbon: sample centerline 8 pts, offset normals by width/2. Implement helper ribbonPath(pts, widths).

Riser: from y=250 to y=550 main body + grip area; reflex: riser curves forward (left) at center? Modern reflex riser: grip behind limb line. Draw riser path: machined with cutouts: outer shape: top pocket (430,250) curving in to grip (420,410-455) then to bottom pocket (430,550); with 2 elongated cutout windows (rounded rects) above & below grip (show background through = use fill-rule with subpaths or draw bg-colored shapes inside — better: actual holes via path evenodd so blurred bg shows ✓). Riser fill: matte dark (graphite #26282c) with subtle vertical gradient + edge highlight. Add brand-ish text? tiny "CARBON-34" engraving — maybe skip text (fonts). Small decorative lines ok.

Grip: slim side-plates (wood/rubber brown) at (418-432, 415-450).

Sight mount at riser front (left face) y≈400: bracket to housing at (370,400). Stabilizer mount at (418, 470) → rod to (300, 486) with weights. Rest mount at (445, 405): biscuit ring centered (452,400) r=17, bristles: draw 16 short lines from rim inward length 7, color tan; ring black. Arrow passes through center hole r=8.

Cable guard: mount at riser back face (448, 470)?? Guard usually near rest height pointing back: from (450, 420) rod to (515, 400)?? Earlier slide at (505,415). Rod: line (452,428)→(512,406), slide ring at (sx, ~400±) riding... slide moves along rod: slide pos = rod start + t_slide*(rod dir), t_slide from 0.92→0.78 as drawn. Cables pass through slide.

Quiver: skip. String silencers: small furry puffs on string near cams ("string leeches") — 2 tiny dark puffs at 15% from each cam ✓ nice detail, they move with string (compute pointAt).

Wrist sling: from riser bottom front (445, 452) a cord loop hanging to bow hand wrist (draw as catenary curve to wrist at (430, 455)) — moves with hand? sling loose: static-ish with sway. Add slight sway animation. Optional; include simple.

Draw hand detail (right hand holding release): fist: rounded rect-ish blob (skin) at W with 4 finger bumps curling around release handle; wrist strap: dark band at wrist + cord to release head at D-loop knot. Release head: small metal caliper (gray) at knot: two jaws (draw closed pre-release, open after). Trigger: tiny line to index finger. After release: hand stays; add subtle open-jaw rotation & 6px gap from D-loop knot which snapped away with string.

Bow hand (left): at grip: palm behind grip (right side), fingers wrap front: draw back-of-hand from wrist (450, 470)?? Bow arm: shoulder S2=(905, 470)?? Bow arm (left arm) extends from left shoulder (lower/forward): S2=(885, 480) to grip (424, 438): nearly straight, slight elbow down at (650, 462). Arm drawn sleeve→forearm→hand. Hand at grip: relaxed fingers: thumb up along riser back, fingers loosely curled front (open grip style with sling). Draw hand as shape around grip with finger hints; knuckle line.

During draw phases, bow arm pushes: S2 fixed, grip moves slightly? Bow group may translate: at draw, riser pushed forward ~6px? The draw = string moves back relative to riser; riser steady (aim). Add tiny riser rise: elbow rotation; skip—keep riser steady, only string/cams/limbs/arrow/arms animate + breathing bob of whole archer group (including bow, tiny).

Release moment effects:

Caption & timeline UI: HTML overlay top center: phase pill showing current phase name + tiny subtitle. Bottom bar: scrubber (input range 0..1 mapped 0..8.2s), play/pause btn, speed select (0.25/0.5/1/2), replay btn, and "⏯ 撒放慢放" button: sets t=4.55, speed=0.25, play. Loop: on reaching end (8.2), either stop (if user scrubbed?) — default loop = true.

Also show draw weight curve? Overkill. Maybe a small "拉力曲线" sparkline with moving dot during draw?? That's a lovely educational touch showing let-off: small SVG chart bottom-right: force vs draw curve peaking then dropping to let-off; dot follows current d; vertical marker at release. Include! It reinforces "完美还原" physics. Draw curve: F(d): rises to peak 70% then falls to 25% at full draw (let-off). Show only when bow visible; keep subtle.

Also labels pointing to parts? Could clutter; add a small legend toggle "标注" that toggles part labels (凸轮, 弓弦, 副弦, 箭台, 瞄准器, 平衡杆, 窥孔, D环, 撒放器, 省力点). Labels with leader lines, only in paused/slow? Just a toggle button. Default ON during idle? Default off, toggle on demand. Hmm — nice for "还原结构" requirement: default ON at start (before first play)? Keep simple: toggle button, default on; labels fade during release phase? Fine—labels static positions (they'd need to follow moving parts...). Moving labels = attach to computed anchor points each frame. Doable: update label positions in rAF. Leader line endpoint = part anchor (e.g., top cam axle), label fixed positions around margins, line from label to anchor. 8 labels. I'll implement with fixed label spots + dynamic lines.

Scope control: This is getting big but it's a single file; JS ~600-800 lines. Manageable. Let me be careful with the screenshot iteration loop.

Plan:

For deterministic screenshots: support ?t=SECONDS&paused=1 to render exact frame. Browser screenshot tool will help me verify. Let me build.

File structure: single index.html. Also maybe save source to /mnt/agents/work (required: code copied to /mnt/agents/work). Yes, copy at end.

Let me write the code now. I'll write in chunks to avoid the 100k limit (it'll be ~40-60KB total, one write ok maybe; keep under 100k chars). Aim ~55-70KB. Might split into 2 writes (append).

Key JS structure:

const T = {idle0:0, draw0:1.0, draw1:3.4, hold1:4.8, brace:5.06, land:5.9, end:8.2};

Phases:

Arrow: nockX = 500 + 280k for k-phase; after brace (t≥5.06): free: compute v0 at brace: derivative numerically: v ≈ (x(5.05)-x(5.04))/0.01 → but easier: choose v=1500px/s at brace, then x(t)=200... wait arrow TIP or nock? Track nock: nock(t) = 500 - v*(t-5.06) + small decel? Air drag negligible: linear. v: powered phase covers 280px in 0.26s accelerating → avg 1077, final v ≈ 2avg ≈ 2150?? Let's compute from k=(1-u)^0.6: dx/dt = 280 * 0.6(1-u)^-0.4 / 0.26 at u→1 → ∞ (asymptote). Physically string leaves arrow at brace with finite v; cap v at 1600px/s. nock_free = 500 - 1600*(t-5.06). Arrow exits view (nock x < -350) at t = 5.06 + 850/1600 = 5.59s ✓ nice fast. Slight drop: y = 400 + 0.5g(dt²), g=40px/s²: at 0.5s drop = 5px subtle ✓ plus initial slight up? arrow launched level. Add drag: v decay 3%/s? negligible over 0.5s. Keep linear + tiny drop.

Bend/flex: amp(t): during 4.8–5.06: a=2.5; after: a=3.2sin(2π9*(t-5.06))exp(-4(t-5.06)). Rotation fishtail: ang = 2.5°sin(2π7*(t-5.06))exp(-3.5(t-5.06)) — small.

Also arrow during draw: arrow moves back with nock (attached) ✓ and vanes pass through biscuit around k when nock-8 < 455 → 500+280k < 463 → k>... nock decreases? No—draw: nock INCREASES (moves right/back): vanes enter biscuit when nock-44 > 455?? Arrow moves right: tail (vanes at nock-8..nock-44) passes rest x=455 when nock-44 ≥ 455 → nock ≥ 499 → k ≥ 0: hmm at brace vanes at 456..492 right of biscuit 455?? Vanes just behind biscuit at setup — typical setup: nock arrow with vanes just off the rest ✓ fine, no interaction. At full draw vanes at 736+ — arrow fully through biscuit except tail. On release tail passes through biscuit at nock<499 → just before brace ✓ add tiny kick? skip.

Camera: scale = 1 + 0.05*smoothstep over draw; shake at release: add rnd decaying offsets for t in [4.8, 5.2]. Zoom center (520, 400): transform = translate(cx,cy) scale(s) translate(-cx,-cy) + shake.

Breathing: bobY = 1.5sin(t2π/3.2) applied to archer group only (not bow) during idle/draw/hold — but hands attach to bow & string; breathing whole scene incl bow tiny (0.8px) simpler: apply to camera group tiny translate.

Hold tremor: k = 1 + 0.004sin(t23)exp(-(t-3.4)1.5)+0.002sin(t7.3).

Sight "aim float": sight fixed on riser; target fixed; fine.

Force curve chart: F(k) = peak pattern: F = 20 + 50sin(πmin(k/0.72,1))^0.8?? Standard: rises steeply, peaks ~ k=0.65-0.75, drops to holding ~25% at k=1 (let-off 75%). F(k) = let me craft: base = sin(πk)^0.9 gives 0 at both ends; want F(1)=0.25: F(k)= (sin(πmin(k,0.98)0.5/0.75 ... simpler piecewise: k≤0.75: F = k/0.75 (linear up to 1); k>0.75: F = 1 - 0.75((k-0.75)/0.25)^1.2 → at k=1: 0.25 ✓ "wall". Draw polyline 0..1, dot at current k during draw/hold; on release dot zips back. Chart 150x90 bottom-right, semi-transparent card. Label "拉力曲线 / let-off 75%". During release maybe hide? Keep always, subtle.

Labels (标注): parts list with anchors:

Hmm wait, total scope is large. Let me make sure I implement in order and test early with screenshots: first static frame (brace) then full-draw then release.

Palette:

Fonts: system-ui; Chinese fine.

Controls styling: dark glassmorphism bottom bar; phase pill top center with dot pulse during release.

Now write it. I'll do a first version, then screenshot at t=0.2 (idle/brace), t=2.2 (mid draw), t=4.0 (full draw), t=4.95 (release mid), t=5.2 (flight), and refine.

One more mechanical check — string tangents: circle center C, radius r, external point P. Tangent points: d = |P-C|, base angle φ = atan2(P-C), α = acos(r/d). Tangent pts at angles φ±α. Two tangents; string uses the one touching cam's rear side. For top cam: N below-right of cam; tangents near horizontal... pick tangent point with larger x? String contacts cam on the side facing the nock (rear-right quadrant). I'll select tangent whose angle from cam center is closest to angle toward nock but offset by wrap direction... Simplest: compute both, choose the one that makes the string wrap look right: for top cam, the free string should leave cam heading down-right toward N; tangent point should be on right side of cam: choose tangent point with greater x? At brace, N=(500,400), C=(428,150): P-C=(72,250), φ≈73.9° (below-right), d=260, α=acos(34/260)=82.5°. Tangents at φ±α = 156.4° or -8.6°. -8.6° → point at C+34*(cos-8.6°,sin-8.6°)=(461.6,144.9) right side ✓ (156° is left side). The straight line from (461.6,144.9) to N(500,400) ✓ grazes circle. Choose tangent minimizing angular distance to φ... -8.6 is φ-α. So for top cam use φ-α; check bottom cam: C=(428,650), N=(500,400): P-C=(72,-250), φ=-73.9°, tangents φ±α = 8.6° (right side ✓) or -156.4°. Use φ+α for bottom ✓.

Wrap arcs: string wraps from tangent point around cam's outer rim (away from nock side) to anchor peg: anchor angle base: top: 200°? Anchor on cam at rim angle A(k) = A0 + θ(k). Choose A0 top = 160° (left-bottom of cam), θ top = -150k → at full draw anchor at 10°?? Wrap arc from tangent(-8.6° at brace) going counterclockwise (through -90 top? no). Hmm which way does string wrap: it wraps over the OUTER (left/front) side of cam: from tangent -8.6° going through 270°(top)? In screen coords angle measured from +x with y down: -8.6° ≈ right side. Outer/front side = left (180°). Wrap path: from -8.6° increasing through 90°(bottom) to 160°? or decreasing through -90°(top) to -200°=160°. The string comes from below (nock below top cam) so it approaches tangent from below-right and wraps over the BOTTOM-left? No... Let me think physically: top cam: string comes UP from nock (below), touches cam's lower-right, wraps around the bottom/left/top of cam (the front side), anchor somewhere on track. So wrap from tangent angle -8.6° going INCREASING? In SVG coords (y down), angle 90° = bottom of cam. From -8.6° (right) through 90° (bottom) to 160° (bottom-left): that's the near/bottom wrap ✓ plausible: arc sweep = 160-(-8.6)=168.6° at brace. As cam rotates θ=-150k (counterclockwise in screen? negative angle = CCW in standard orientation; with y down, rotation direction flips visually—whatever, tune by screenshot): anchor A(k)=160+θ. For string to UNWRAP during draw, wrap arc length should shrink: arc = A(k) - (-8.6) should shrink → A(k) decreases → θ negative ✓ top θ = -150k: A(1)=10°, arc=18.6° tiny ✓ string fully paid out at full draw ✓✓. Bottom cam mirrored: tangent 8.6°, wrap increasing through?? bottom cam: string comes from above, touches upper-right (8.6°... hmm 8.6° is right side slightly down). By symmetry (vertical flip): bottom tangent = -(top tangent) = 8.6°, bottom anchor A0 = -160°, wrap from 8.6° decreasing through -90°(top) to -160°: arc length 168.6 ✓; θ bottom = +150k → A(k)=-160+150k=-10 at full → arc tiny ✓.

Arc drawing: path arc from tangent pt to anchor pt with large-arc = (arclen>180), sweep direction: top: from -8.6 to 160 increasing → in SVG sweep-flag=1 (positive angle direction = clockwise visually since y down)... I'll compute points and use A with flags; verify visually.

Cable anchors: on each cam at radius rc=22, base angle: top cable anchor B0_top = 340°? cables attach and wrap oppositely: cable TAKES UP during draw (wrap increases). Bottom cam's cable anchor connects via cable up to top cam... In dual cam: string anchors on both cams' string tracks; control cable(s) anchor on each cam and run to the opposite cam's axle region. Visual: cable from top cam (anchor rotating, radius 22) straight down through slide to bottom cam tangent-ish. I'll draw: cable path: anchorPt_topCam(r=22, angle C0+θ) → slide hole 1 → anchorPt_botCam(r=22, angle C0b+θb). With C0 chosen so cable hugs cam inner side. Just pick angles that look right on screenshot; cables near-vertical lines at x≈455-465 passing slide. Might collide with arrow (y=400): cables at x>455 to the right of arrow shaft — arrow at y=400 spans x 480-780 at full draw — cables cross the arrow's vertical line?? Cables vertical at x≈462; arrow horizontal at y=400: they CROSS visually at (462,400). In reality cable guard holds cables to the SIDE (out of arrow plane) — in pure side view cables would overlap arrow. Solution: offset cables slightly right (x≈475-485) and draw them BEHIND arrow (draw cables before arrow). Slide/rod also behind arrow. Visual overlap acceptable (cable slide typically just below arrow; put slide at y=430 below arrow line, cables from slide up/down hugging x=478). At full draw cables angle toward cams slightly. OK.

Rest & sight relative: sight housing at (368, 392) might overlap string? String at brace x≈461-500 region... sight at x 340-395 in front of riser ✓ clear. Stabilizer (300,486) clear below.

Peep vs sight line: eye(762,358) → peep(721,357) → sight pin should align at full draw: line continues to x=368: y≈357- (tiny slope): slope = (358-357)/(762-721)=0.024 → at x=368: y = 357 + 0.024*(721-368)=365.5. So top pin dot at ~(368, 366)? Pins: set 5 dots y = 366, 376, 386, 396, 406 (20-60yd) within housing (center 392, r 30): hmm top dot at 366 near top edge ✓. The 20yd pin aligns with peep-eye at full draw ✓ nice detail — the archer aims with top pin.

Alright, also "拉开复合弓" includes initially the archer maybe raises bow — skip raising; start already holding, arrow nocked, brief idle then draw.

Let me also add subtle sun glint on cam at release? skip.

Time to code. I'll write file in 2-3 append chunks. Then open via browser tool (file:// path) — browser_visit with file:///tmp/compound_bow/index.html?t=4.0&paused=1, screenshot. Iterate.

Note: the version manager — need to load it first via select_tools. Its exact API (build_version params) will be injected at load.

Let me start writing. Chunk 1: HTML head, CSS, SVG defs, background, static archer parts skeleton... Actually all geometry computed in JS — I'll build SVG mostly via JS DOM creation? Mixed: static shapes handwritten in markup; dynamic parts (limbs, cams, string, cables, arrow, arms, hands, peep, dloop, labels, force dot) created/updated in JS. To keep code organized, I'll create most elements in JS (namespace helper) and keep markup minimal: <svg><defs>

Order of groups (z): gBg (blurred) > gCam(camera transform) contains: gArcherBack(torso,bowArm,head,drawArm) > gBow(riser,guard,cables,stabilizer,sight,limbs,cams,rest,arrow?no) careful: arrow behind rest ring but in front of riser; cables behind arrow.

gBow children order: stabilizer, riser, cableGuard rod, cables, slide, limbs(top/bot), cams, sight, restBack? whisker biscuit: ring should surround arrow: draw ring BEFORE arrow (arrow over ring center hole, bristles under arrow?) Bristles in front of arrow look better (arrow nestled in bristles): draw biscuit ring base, then arrow, then bristles overlay. I'll split rest into restBase + restBristles with arrow between.

So: gBow: stabilizer, riser, guardRod, cables, slide, limbs, cams, sight, restBase, [arrow], restBristles, stringWraps? string after hands...

Then gHands: drawHand+release (over bow, under string), then gString: string main, serving, wraps on cams, peep, dloop, silencers; then gBowHand+sling (over everything near grip); then labels group; then FX (streaks).

Wait — string wraps on cams drawn after cams ✓ (gString after gBow ✓). But string under drawHand? Draw hand holds release near D-loop; string passes in front of hand at anchor — string over hand ✓ (gString after gHands ✓). Release caliper should grip D-loop: caliper over/under dloop? caliper around knot: draw release in gHands (under string/dloop) then D-loop knot overlaps caliper — looks clamped ✓ ok.

Bow hand over string? At brace string is 70px behind grip — no overlap; fine either way; draw last anyway.

Arrow must be under string? Nock attaches ON string: string passes through nock throat: draw string over arrow ✓ (gString after gBow containing arrow ✓).

Let me now also define head/face path coordinates concretely (I'll iterate visually):

Face profile points (facing left), skin path: M 758 318 (forehead top under cap) Q 746 322 744 336 (brow) L 740 348 (brow bottom) Q 732 356 730 366 (nose bridge) Q 728 372 736 374 (nose tip) Q 744 376 742 382 (under nose) L 744 388 (philtrum) Q 750 392 748 397 (lips) Q 752 402 750 407 Q 756 416 768 420 (chin to jaw) L 792 414 (jaw corner — anchor point) L 800 396 (under ear) Q 806 380 800 366 (ear back) ... ear separate shape at (798,360). Then skull back up: Q 812 340 806 322 → cap covers top. Neck: from (796,400) down: L 812 430 L 834 462 (into collar). Close path back along top hidden by cap.

Eye: at (762,352): almond path + iris dot; eyebrow: (752,340)-(770,338) slight angle. Nose tip: adjust to touch string (742,372)-ish at full draw ✓ approx above path gives tip ~(736,374): string at y=374: u=(374-160)/240=0.89, x=455+325*0.89=745: tip at 736, gap 9px — enlarge nose a bit: nose tip to (743,373). Tune visually.

Cap: crown: M 752 316 Q 760 292 800 292 Q 846 292 856 318 L 858 330 Q 800 318 752 324 Z with camo blotches; brim: M 754 318 Q 726 320 700 332 Q 726 334 756 330 Z; button on top. Sweatband shadow over forehead.

Hair: at back under cap (820-858, 320-345) dark; sideburn.

Torso: shirt from (838, 452) shoulder → (900, 470) chest front line down-right to (980, 620) → off frame right/bottom: big path covering x>836 lower right, with camo. Only shoulder/chest sliver visible basically. Plus collar at neck base.

Bow arm (left arm): S2=(876, 486) (left shoulder lower front), elbow (640, 470), wrist/grip hand (446, 444). Sleeve to (700,476) then skin forearm. Slight muscle. Elbow crease. During draw: arm rigid; whole bow+arm micro bob.

Draw arm: S=(848,458) — wait torso shoulder for draw arm at back: S=(856, 452) under cap/behind? Draw arm shoulder = right shoulder which in profile is behind (far side) — draw it slightly darker (far arm) emerging from torso at (880, 460). Sleeve to elbow region, forearm skin to W. Elbow keyframes: k=0: E=(724, 500) (bent down); k=0.5: E=(868, 492); k=1: E=(988, 462). W(k)=N+(10,22): k0 (510,422), k1 (790,422).

Check k=0 arm: S(880,460) → E(724,500) → W(510,422): upper len = sqrt(156²+40²)=161; fore = sqrt(214²+78²)=227. k=1: S→E = sqrt(108²+2²)=108; E→W = sqrt(198²+40²)=202. Consistent-ish (161→108 upper arm changes — stylized cheat; visually shoulders don't measure). Acceptable for illustration; the motion reads correctly.

Far arm darker shade to convey depth ✓.

Hands:

At k=0 (setup), knot at (516,400), wrist W=(510,422): rod from (524,420) to (516,400) short ✓ hand right under knot ✓.

Wrist sling: cord from riser (438, 462) loop down to wrist (455, 458): catenary-ish, orange/black.

OK writing now. Also FPS-independent: use performance clock; t = (now-start)/1000 * speed; loop with modulo (end 8.2s) but hold 0.6s black? Just wrap: when t>8.2 → t-=8.2 (arrow pops back — acceptable as loop restart; add 0.3s fade via overlay? do quick fade: overlay opacity spike on wrap: detect wrap, set fadeDiv transition. Simple.)

Scrubber: input range 0..820; on input set t, pause. Play button toggles. Speed buttons. "撒放瞬间慢放" button: t=4.6, speed 0.25, play.

Force chart: canvas or svg polyline; dot. Chart precomputed path static; dot updated.

Labels: 10 items: define label spots (x,y, side) + anchor fn returning point. Update lines each frame; hide when toggled off. Also labels hidden when x of anchor + leader crosses arrow at high speed? leave.

Phase pill text updates: t<1: "待命 · 搭箭就绪" 1–3.4: "开弓 · 凸轮转动储能" 3.4–4.8: "满弓 · 省力点保持（let-off）· 三点一线瞄准" 4.8–5.06: "撒放！" 5.06–5.6: "箭矢离弦 · 离弓飞行" 5.6–8.2: "随势 · 余振衰减"

Edge: arrow "leaves bow" moment: when nock passes riser plane (x<455) mark pill "箭矢完全离弓" briefly? fold into above.

Alright — also small detail: at full draw add slight cam "valley" — the draw force chart dot at k=1 shows low force ✓ plus caption mentions.

Let me write the HTML now.

Rough size estimate: ~50KB. I'll split into two writes.

Code sketch:

<!DOCTYPE html><html lang="zh"><head><meta charset="utf-8"><meta viewport><title>复合弓撒放特写</title><style>…</style></head>

<body> <div id="stage"><svg id="svg" viewBox="0 0 1280 800">…</svg> <div id="phasePill"><span id="phaseDot"></span><span id="phaseTxt"></span></div> <div id="labels"?> labels inside svg better (gLabels). <div id="controls"> buttons…</div> <div id="fadeDiv"></div> </div> <script>…</script>

Let me write CSS: stage full viewport, dark backdrop #0e1116 around letterboxed svg; svg width 100% height 100% preserveAspectRatio meet; controls absolute bottom center glassy; pill top center.

JS helpers: const S=(id)=>document.getElementById(id); const NS='http://www.w3.org/2000/svg'; function el(name, attrs, parent){...} const lerp=(a,b,u)=>a+(b-a)*u; const clamp, easeInOutCubic, easeOutCubic, smoothstep. Geom: rot(px,py,cx,cy,deg).

State: let t=0, speed=1, playing=true, last=performance.now().

In loop: dt real; if playing t += dt*speed; if t>END {t-=END; flashFade();} compute(t): returns all points; updateDOM(computed).

I'll precreate all dynamic elements once (limb paths, cam groups, string paths, arrow group, arms paths, hands groups, cables, slide, peep, dloop, serving, silencers, labels lines, chart dot, stabilizer (static but jolts with bow group), etc.)

Bow group gBowInner gets jolt transform at release (rotate/translate damped) — but arms connect shoulder(fixed in archer group) to grip (in bow group)... if bow jolts but arm endpoints computed in global coords, mismatch. Simplify: apply jolt to gCam-wide? jolt whole bow+arms+hands+string+arrow? During release everything shakes anyway: apply jolt to a wrapper gKick containing gBow, gString, gHands, bowHand, bow arm? bow arm spans shoulder→grip; jolt moves grip; if arm not jolted, wrist detaches. Easiest: put EVERYTHING except bg & torso/head/draw-arm-upper?? draw hand interacts with string at release (stays at jaw while string jumps)... jolt includes string: string jumps forward-left; draw hand (not jolted) stays — correct physics! Bow hand grips bow (jolted together ✓ if bowHand in jolt group). Bow arm wrist at grip — jolts with bow: put bowArm in jolt group; shoulder end jolts 3px — invisible ✓. Head/torso/drawArm/drawHand outside jolt ✓. Arrow during powered phase: attached to string (jolt together ✓ put arrow in jolt group); after brace arrow free — if still in jolt group it'd shake — by then jolt decayed (~0 by 5.3s) fine. FX streaks with arrow ✓.

Jolt: rot = -1.1°*exp(-(t-4.8)*6)*cos((t-4.8)30)? plus tx = -5exp(-(t-4.8)*7). For t<4.8: 0. Pivot at grip (430,435).

Camera transform on gCam: zoom s(t): 1 → 1.05 during draw (smoothstep 1→4.8), hold, slight +0.01 at release? keep. center (520,400). Shake: t in [4.8,5.15]: amp 2.2*exp(-(t-4.8)*18)*sin((t-4.8)*120) on x.

Also idle bow cant: bow slightly tilted? Keep vertical.

Now string vibration visual after release: add tiny sine offset to N along y? N stays centered; add to serving mid? skip—string osc k covers it (string goes slightly forward/back). Also the string at rest isn't perfectly straight between cams—it is. fine.

Also nock point N for k possibly negative (osc): nockX = 500+280k fine.

One more: during draw, cams translate (axle lerp) AND rotate; limbs ribbon recomputed; riser static. Limb ribbon: centerline: pocket P0, tip at axle A(k); control: mid + normal*flex: flex(k) = 10 + 26k (bend toward right/back (+x)). Direction P0→A mostly vertical; normal ≈ (+1, small). width taper 26→15. Camo fill via pattern url.

Pockets: top pocket at (433, 258); axle rest (428,150): limb length 108px? Real limbs ~ shorter vs riser; ok.

Also add limb pockets drawn on riser (black blocks) and axle forks at tips: small U around cam: draw fork as two prongs beside cam (in front plane, side view: one line each side of cam) — draw small bracket behind cam: rect from limb end to axle + tiny axle nut front.

Cam axle nut: hexagon at cam center front (r 6, gray) — drawn in cam group NOT rotating? axle nut doesn't rotate (axle fixed to limb; cam rotates around it) → draw nut outside rotating group ✓ detail!

Let-off stops: small peg on cam edge that contacts inner limb at full draw: draw tiny peg at cam rim angle 20° (rotating); limb stop pad small; at k=1 they meet — hard to align perfectly; skip.

Alright, also FX: release "twang" lines: 3 short arcs near string mid, opacity spike at 4.8-5.1. And dust puff at cams? skip.

Chart: static path F(k) polyline points precomputed in JS into #chartPath; axes; dot #chartDot; label "拉力—行程曲线". Position: svg coords (1080,640)-(1240,760)?? overlaps torso right edge; place bottom-LEFT (60,640)-(230,770)? target blur at left edge (60,470) — chart at bottom-left corner (40,650) fine.

Hmm wait: arrow exits left crossing chart? Arrow at y≈400; chart at y 650-770 ✓ clear.

OK — write the file. Also remember KIMI_REF? This is browser-openable → website_version_manager route, NOT KIMI_REF. Copy source to /mnt/agents/work too.

Let me carefully write out the code.

Also I need browser tools to test: select mshtools-browser_visit + browser_screenshot (and version manager). Load all three now plus maybe browser_find not needed.

Write chunk 1: markup + css + bg + static svg pieces + defs + start of script (helpers, elements creation). Chunk 2: compute/update logic + loop + controls.

Let me define precise static numbers:

Also arrow crossing cables: arrow at y=400 x up to 780: cables at y=400: x≈505 (near slide) → arrow passes just left of slide? Arrow shaft at y=400; slide hole1 at (508,401)±perp: holes perpendicular to rod: rod dir ≈ (90,-24) normalized (0.966,-0.257); perp (0.257,0.966): holes at slide ±7perp → (510,404.8) & (506.4,391.2). Arrow at y=400 crosses between holes region x 506-510 — shaft would visually collide with slide block. Move slide lower: guard rod angled down-back instead: rod from (452,430) to (516,452)?? Some bows guard below arrow. Set rod from (450,424) to (518,448) (down-back); slide at param ~0.85: (508,444); holes perp: dir (0.943,0.333), perp (-0.333,0.943): holes (508∓2.3, 444±6.6) → (505.7,450.6) & (510.3,437.4) both below arrow y=400 ✓ clear by 37px. Cables from top anchor (445,159)?? to hole (510,437): passes near nock at full draw (780,400)?? no, cables near x≤510 ✓. But cable path top anchor at y=159 x=445 down to (510,437): crosses string? string at brace from (461,145) to (500,400): at y=437?? string ends at nock y=400. At y=300: string x≈481; cable x = 445+65(141/278)=478 — cables left of string by 3px at brace, converging. With +14 offset: 492 vs 481 → cable right of string ✓ good (cables on archer side). Apply offset: draw cables with +14 x shift. Bottom cable mirrored. At full draw cams rotate anchors: anchors move with θ — fine.

OK good enough; visual check will confirm.

Wait: D-loop tied points are ON string above/below nock; when string is V-shaped (drawn), the "above" point is along upper segment. pointAt(total/2 ± 13). ✓

Arrow group (id gArrow, transform translate(nockX - NOCK_REF, nockY-400) rotate(ang) ) drawn at base pose along x with nock at local x=0: so local coords: nock at (0,0), shaft from (-8,0) to (-300,0), tip point at (-300-16,0)? field point: cone from (-300,0) to (-318,0) base width 7. vanes at (-14..-52, heights). Then world nock pos = (nockX, nockY). During draw/hold/powered: nockX=500+280k, nockY=400. After: free flight params. ang slight. Arrow flex: shaft as path M -8 0 Q -160 bend -300 0 where bend varies. Vaned part rigid near nock; bend applied to front 2/3? Just whole-shaft quadratic, amplitude small.

Vanes: 2 visible: upper vane: path M -16 0 L -18 -8 Q -34 -11 -50 -5 L -52 0 Z (orange); lower similar (orange); cock vane hint: thin ridge line above shaft? In profile with helical clamp, third vane shows as small bump mid: add tiny white triangle at (-30, 3)-(−44,3)... draw small white vane edge at slight angle below/above: M -22 2 L -46 6 L -24 8 Z white 60% — suggests 3rd vane ✓.

Cresting: band at (-150..-128, ±3.2) orange + thin white pinstripe. Shaft width 6.4 (stroke 6.4? draw as rect h 5 r2.5) black with subtle top highlight line.

Nock: green piece at (-2..-12) width 7 with throat notch at 0 where string sits. Lighted nock glow? no.

Broadhead vs field point: field point (target) silver bullet cone ✓ (hunting broadhead would be near sight... field point fine).

Streaks: 3 lines from tip trailing: at (tipX+10 .. +90) slight angles, white gradient opacity = speedFactor.

Now head/face — I'll write initial path and fix visually.

Torso path: M 836 448 (shoulder front) Q 870 470 892 520 (chest) L 940 640 L 1080 660 L 1080 800?? Actually torso to bottom-right corner: cover (1080,800) corner; line back up right edge x=1080? Frame right edge is 1280; torso could extend to right edge: L 1280 700 L 1280 800 L 940 800? Simpler: torso polygon: (836,448) → (884,516) → (930,640) → (1280,760) → (1280,800) → (860,800)?? The bottom of frame: do we see archer's torso down to waist? Close-up: frame includes from ~chest up? y 450-800 includes torso mass on right. Let me: shirt region: path M 836 446 Q 900 480 940 560 Q 980 660 1000 800 L 1280 800 L 1280 640 Q 1180 560 1080 520 Q 1000 480 950 440 Q 890 420 836 446 Z with camo fill. Shoulder seam for draw arm at (880,460).

Draw arm sleeve: from S(880,460) to mid upper arm: width 40 shirt camo; then skin to wrist width 24.

Bow arm: S2 (872, 500)?? hmm left shoulder slightly lower/front: (860, 505) → elbow (632, 482) → wrist (450, 448). Sleeve to (700,488), skin forearm. Width 38/26. Elbow slight crease dot.

Bow shoulder connect to torso ✓.

Neck: from jaw (798,398) → (818,448) → (852,462) → (836,470)?? draw neck as part of head path: after ear back, path continues down neck to collar (846,456), then close via hidden region behind cap/face. Collar: shirt neckline arc at (830-880, 450-475).

Cap: as planned. Add cap rear strap & buckle hint, hair below cap back (small dark wedge (846,318)-(866,352)).

Eye: brow ridge shadow; eye almond M 756 352 Q 764 346 772 351 Q 765 355 756 352 Z, iris circle r2.2 at (764,351) dark; upper lid line stroke; eyebrow M 752 341 Q 763 336 774 340 stroke 3 brown; slight squint lines optional.

Ear: at (800,360): ellipse-ish path + inner curve.

Face shading: subtle darker under jaw, cheek shadow; nose highlight.

Also archer wears glove? Release aid → no glove ✓.

Alright — code writing time. I'll try to be meticulous about matching ids between creation and update.

Also the "fade on loop wrap": fadeDiv black overlay opacity animate 0→0.25→0 quickly (CSS transition triggered by class toggle). Minor.

Controls markup:

<div id="bar"> <button id="btnPlay">⏸</button> <button id="btnReplay">↺ 重播</button> <button id="btnSlow">🎯 撒放瞬间慢放</button> <button id="btnLabels">标注 开</button> <input id="scrub" type="range" min="0" max="820" value="0"> <div id="speeds"> <button data-s="0.25">0.25×</button><button data-s="0.5">0.5×</button><button data-s="1" class="on">1×</button><button data-s="2">2×</button></div> </div> Style: pill glass bottom center, scrub flex-1.

Emoji in buttons fine (UI, not file content rule? rule says avoid emojis in file content unless requested... these are UI glyphs in the deliverable file. "Do not insert emojis unless explicitly asked" (edit_file guideline) / artifact rule: avoid emojis in file content. Hmm — that rule targets document files mostly, but to be safe use text/SVG icons: use "❚❚"/"▶" (geometric shapes, not emoji) and plain text. Use ▶/❚❚, ↺, and "撒放慢放". Avoid 🎯.)

Now writing. I'll produce the file in ~3 appends. Let me draft carefully.

Also add <title>

One more consideration: 1280x800 viewBox; on wide screens letterboxed with backdrop blur fill — set body background #0b0e12.

Let me write chunk 1.

Actually also: labels leader lines need anchor points: define function anchors(k, geom) returning map id→{x,y}. geom object computed each frame (axles, tangents, nock, peepPos, slidePos, etc.) — reuse for labels ✓.

Label spots (left side, x≈40-240; right side near archer fewer to avoid covering face):

Anchor coords move (cam, peep, string, knot) ✓ update each frame.

Chart card bottom-left: rect (30,646,210,120) rx10 fill rgba(10,14,18,.55) stroke rgba(255,255,255,.12); title "拉力—开弓行程"; axes; path; dot; "省力比≈75%" small text right. Wait bottom-left also has 平衡杆 label (150,590) — shift chart to (30,668,210,104)?? height 104 → 668+104=772 ✓. Label 平衡杆 at (150,600) then chart below it ok. Or move chart bottom-CENTER-left (300,660)? might collide arrow flight path? arrow y≈400 ✓ safe. Put chart at (40,650,200,110). fine.

Also top-left small title card: "复合弓 · 开弓—撒放特写" + subtitle "双凸轮系统 / 省力点 / 离弦瞬间". Place top-left (30,26). Phase pill top-center.

Let me write the code now for real. I'll be careful with syntax. Roughly 700 lines JS. Split writes:

Write 1 (create): doctype→svg defs & static groups markup→ open script with helpers + constants + element refs + creation of dynamic elements. Write 2 (append): geometry compute + update functions + timeline loop + controls + labels/chart init + closing tags.

Careful: file must not exceed 100k per write; each ~30-40KB fine.

Let me now write all the actual path data etc. I'll invent static path data for riser/head/torso etc. in markup (as path d strings) and dynamic ones in JS.

Riser path (closed, evenodd with windows): Outer: M 447 244 C 455 268 458 300 456 330 (back edge upper) C 455 356 452 380 448 398 (toward grip back) C 446 420 446 442 448 462 (grip back) C 452 486 456 512 458 540 (lower back) C 459 556 458 566 452 574 (bottom pocket back) L 424 576 (bottom pocket front-ish) C 416 570 413 558 414 544 C 417 516 420 492 420 470 C 420 452 419 436 417 424 (front grip edge) C 414 402 411 380 412 356 C 413 330 416 300 420 272 C 422 258 426 248 432 244 Z Windows: M 429 300 a 9 26 0 1 0 0.1 52 ... hmm elongated hole: rounded rect path: M 429 296 C 424 296 422 302 422 312 L 422 340 C 422 350 424 356 429 356 C 434 356 436 350 436 340 L 436 312 C 436 302 434 296 429 296 Z (upper window y296-356). Second window lower: y 486-546 similar x 430ish: M 431 486 ... Z. Also small third near grip? two is fine. Plus sight window (the big cutout above grip where arrow passes — actually arrow passes OVER riser shelf; the sight window: region x 412-446 y 372-428 is where rest mounts; keep solid there (mounts). OK.

Grip: separate shape over riser at (417-447, 408-462): side plate: rounded rect path fill wood gradient.

Riser pockets: top: rect-ish (420-452, 240-268) black; limb sits from pocket going up.

Limb angles: top pocket center (436, 252); axle rest (426,152): limb leans slightly back(top x less)?? Top axle x 426 < pocket 436: limb leans back (toward archer) at top — modern deflex/reflex vary; fine.

Bottom pocket (436, 552); axle rest (426,648).

Limb centerline quad: P0=pocket edge (434,258), P2=axle, ctrl = mid + (12+22k, 0)?? bend toward +x (archer): ctrl=( (434+426)/2 + 10+24k, (258+152)/2 ) = (440+10+24k, 205). Widths: 24 at base → 15 at tip. Ribbon path computed.

Fork tip: small bracket at axle: line from limb end ±: draw rect (axle-4..axle+4? ) skip fork, add axle nut hex + small washer.

Cams: group at axle; inner rotating group g with θ. Cam artwork (local, rotation center 0,0):

Wrap arc path: from tangentPt, A r30 r30 0 largeArc sweep anchorPt. largeArc = arcLen>180 ? 1:0. sweep: top: 1 (increasing angle = clockwise in svg = sweep 1 ✓). bottom: 0.

Also the string should visually sit in groove r30 — draw wrap with same string color width 4.5.

At brace arc len 168.6 <180 → largeArc 0. ok. During draw shrinks ✓.

Cable anchors: top cam cable peg local angle 195° r20; world = 195+θt. At brace: 195° → point (426+20cos195, 152+20sin195) = (426-19.3, 152-5.2)=(406.7,146.8) — that's FRONT-left?? cos195 negative → x 406 < riser front 412 at that height (riser starts 244) so cable from (407,147) down to slide (510,444): crosses the string massively?? String from (460,145) to (500,400). Cable at y=300: x = 407 + 103*(153/297) = 460 — string at y=300 x≈481: cable 21px LEFT of string at brace. Hmm cables on wrong side again. Cable peg should be on archer side (right): local angle ~ -20°?? but cables wrap opposite: at draw, cable wraps MORE onto cam (taken up). Choose cable peg local -30°: world at brace: -30° → (426+17.3, 152-10)=(443.3,142). At full draw θt=-150 → -180° → (426-20, 152)=(406,152). Cable path: (443,142)→slide(510,444): at y=300 x=480.6 vs string at full draw from top tangent to nock(780,400): at y=300: u=(300-160)/240=0.583, x=455+3250.583=644?? wait full draw tangent changes (axle moved & k=1): tangent from N(780,400) to circle (468,196,r30): d=sqrt(312²+204²)=372.6, φ=atan2(204,312)=33.2°, α=acos(30/372.6)=85.4°, top tangent angle φ-α=-52.2° → pt = (468+30cos(-52.2), 196+30sin(-52.2)) = (468+18.4, 196-23.7)=(486.4,172.3). String upper seg from (486,172) to (780,400): at y=300: u=(300-172.3)/(400-172.3)=0.561 → x=486+2940.561=651. Cable at y=300: 480. Cable way left of string ✓ (no collision with nock/arrow at y=400: cable at y=400 x≈506 vs arrow nock 780 ✓). At brace: string upper from (461,145)?? recompute brace tangent: C(426,152) r30, N(500,400): d=259.9? (74,248): d=259, φ=73.4°, α=acos(30/259)=83.3°, tangent angle φ-α=-9.9° → pt=(426+29.5, 152-5.2)=(455.5,146.8). String brace: (455.5,146.8)→(500,400): at y=300 x≈478. Cable at brace: (443,142)→(510,444): at y=300: x=443+67*(158/302)=478!! coincides with string at y=300. Overlap exactly — bad. Push cable right: slide further right & anchor angle 0°: anchor (446,152)?? cable (446,152)→(518,446): at y=300: 446+72*(148/294)=482 vs string 478 → 4px right. Meh. Give cables constant +12x draw offset (fake perspective): then 494 vs 478 ✓ 16px separation, looks like parallel rigging ✓. And at full draw cable 492+? with offset 492 vs string 651 fine. Apply +12 to cable path x's. Slide drawn at actual (510,444) but cable bends at slide holes — with +12 offset cables pass at (522,444)-ish: draw slide AT (522,444) then? The guard rod then to (522+? ...) rod from (450,424) to (530,450): slide at 0.85 → (518,446). Offset cables pass slide holes at ±perp: fine—draw slide at cable crossing (no extra offset for slide; offset applied to anchors instead? Cleanest: apply +12 to anchor points only; cables from (anchor+12) straight to slide holes (real pos). Slight inconsistency at cam contact invisible.

OK. Bottom cable mirrored: peg local 180+30=210°?? mirror of top: bottom cable peg local +30° (world +30+θb, θb=+150k): brace: (426+17.3, 648+10)=(443.3,658)+12 → (455,658) up to slide2 (510,450): fine.

Cables color: #1a1c1f width 3.2 vs string #33463a width 4.5 — string thicker/lighter (serving). Cross-serving colors ok.

Slide: small rounded rect 12x10 at pos with two holes r2.2 — draw simplified block.

Also cable guard rod: from riser back near rest (450, 424) to slide base: line stroke #3a3f46 width 5; small clamp at riser.

Peep position: pointAt string polyline from top: s_peep = 0.80 * len(upper).

Nock set dot: pointAt(total/2 - 14) r1.6 #c8a84a.

String silencers at s=0.10L and 0.90L: fuzzy: 8 short lines radiating r4-7 stroke #1d2126 + core r3.

Now head/face path (initial; will refine via screenshot):

skin path id=headFace: M 752 318 C 744 322 741 330 741 338 C 738 344 733 350 731 356 C 728 364 727 370 733 373 (nose tip ~ (733,373)) C 739 376 740 380 738 384 C 741 388 745 390 744 394 (lips) C 748 398 747 402 745 405 C 750 412 758 418 770 421 (chin→jaw) L 793 416 (jaw corner near anchor (793,416)) C 801 410 804 400 802 388 C 808 378 808 366 802 356 C 810 340 810 324 800 314 C 790 305 768 306 752 318 Z (skull top — under cap mostly) Neck: separate path: M 790 400 L 812 448 Q 830 460 852 458 L 846 430 Q 824 420 806 396 Z?? overlapping; simpler neck: M 792 402 C 800 424 812 442 832 452 L 858 452 C 840 436 828 416 822 396 Z — tune later. Ear: M 794 356 q 10 -4 12 6 q 1 10 -7 13 q -8 2 -8 -6 q 0 -9 3 -13 + inner curve.

Nose tip (733,373): string at full draw at y=373: u=(373-172.3)/227.7=0.881 → x = 486+294*0.881=745. Gap 12px: string passes behind nose tip — visually string behind face at nose → looks like string not touching — actually CORRECT: string passes slightly behind nose tip? No, at anchor string touches nose tip: string x should ≈ nose tip x. 745 vs 733: string 12px to the RIGHT of nose tip: string appears behind nose (nose overlaps string since face drawn before string, string crosses face!). String at y=373 is at x=745 which is INSIDE face silhouette (face spans up to nose tip 733 at that y: 745 > 733 → inside head region → string will visually cut through face ✗✗. Hmm! Real anchor: string DOES run in front of face touching nose/lips slightly — in profile view, string line passes right at the face surface, crossing silhouette only at contact point. So I must shape face so its right contour at y 350-420 follows just right of string line: string from (486,172)?? no—string near face: from nock (780,400) up to tangent (486,172): face must be RIGHT of this line (string in front of face from viewer? viewer sees side; string between viewer and face? string overlays face = string in front — that's FINE and realistic: string in front of cheek/nose touching. Actually yes! At full draw the string is in front of the face plane slightly, touching nose tip. In side view drawings, string overlaps the face contour slightly and reads correctly (string touches nose). The issue is only aesthetic: string crossing deep into face looks wrong. Face contour at y=373 spans x from nose tip 733 to back of jaw ~800: string at 745 → crosses 12px into face: reads as string pressing nose tip — GOOD if subtle (≤12px). Keep nose tip at (739,374): string presses 6px — perfect "string touches nose" ✓.

Eye (762,352): string at y=352: u=(352-172.3)/227.7=0.789 → x=718: eye at 762: string 44px in front of eye ✓ peep between: peep at s=0.80upperLen: upperLen = |(486,172)-(780,400)| = sqrt(294²+228²)=372: s=297.6 → point = (486+0.8294, 172+0.8228)=(721,354.4): peep (721,354), eye (762,352): peep 41px ahead ✓ and peep 3px left of string-nose line?? peep ON string ✓. Sight line eye→peep extended to sight (366): slope (352-354)/(762-721)=-0.049 → at x=366: y = 354 + (-0.049)(721-366)=354-17.4=336.6?? That means aiming UP — pin at y 366 expected. Slope: eye slightly above peep → looking slightly down through peep?? eye (762,352), peep (721,354): from eye to peep direction: left & slightly down; continuing to sight: y at 366: 354 + (354-352)/(762-721)(721-366)?? slope = (354-352)/(721-762) = 2/-41 = -0.0488 (y per x). y(366) = 354 + (-0.0488)(366-721) = 354+17.3=371.3. Pin top at 366 vs 371 — off by 5px: adjust peep s to 0.79 → peep (718,352): slope (352-352)=0 → y(366)=352?? Then pin should be at 352 — too high for housing (inner top 364). Rather adjust EYE to (762,357): slope=(354-357)/(721-762)=(-3)/(-41)=0.0732: y(366)=354+0.0732(366-721)=354-26=328?? sign mess. Let me just do: line through eye E and peep P; want at x=366 → y≈368. Points: P(721,354). Need E such that (E.y-354)/(762-721) = (354-368)/(721-366) = -14/355 = -0.0394 → E.y = 354 + 41*(-0.0394) = 352.4. Eye y 352 ✓ current. Pin at y 368: set pins start 368.

Adjust: pins y: 368, 378, 388, 398, 408; housing center (366,394) ry 32 → inner 366..420 ✓ top pin 368 ✓ aligns ✓.

Cap: crown path: M 748 316 C 754 292 786 284 818 288 C 852 292 866 306 864 326 C 830 316 786 312 748 322 Z; brim: M 750 312 C 726 314 700 324 692 336 C 716 336 740 330 756 324 Z; underside shadow on brim; button at (812,290). Camo blotches on cap: few ellipses.

Hair: below cap back: M 858 322 q 8 6 6 22 l -10 4 q 2 -16 4 -26 Z dark brown.

Torso: M 832 446 C 872 452 916 480 948 528 C 986 584 1012 660 1024 800 L 1280 800 L 1280 620 C 1200 560 1110 516 1020 486 C 950 460 890 440 832 446 Z — plus collar: M 826 446 q 30 18 54 14 l -6 -20 q -26 4 -48 6 Z darker.

Draw arm emerges at S(886,466).

Bow shoulder S2(862, 512)?? torso front edge at y 500 x≈ 880: S2 (866,508) ok.

Breathing bob: apply to gArcher (torso, head, arms) + hands: translate y = 1.2*sin(2π t /3.4) during t<4.8, decaying after? After release breathing continues subtle ✓ keep always amplitude 1.2 except during [4.6,5.4] reduce to 0.4. Bow NOT bobbing (held steady aim) but bow hand/arm bob... inconsistency invisible at 1px. Fine: apply bob to archer parts only.

Hands detail:

Draw hand group at W (from geom): fist: path around (0,0) local: M -14 -10 q 16 -8 26 2 q 8 8 2 18 q -6 10 -20 8 q -14 -2 -14 -14 q 0 -8 6 -14?? I'll craft simpler: rounded blob: rect x-16 y-12 w 34 h 26 rx 12 fill skin; knuckle arcs: 3 small arcs along top; thumb: ellipse at (-10, 6) rotate -30; wrist strap: rect (14,-14, 16, 30) rx 6 #2a2d33 + buckle line; release shank: line from (26, -2) to knotPos (world) — draw in world coords instead: shank = line from strap front (W.x+24, W.y-2) to knot; caliper: at knot: two small arcs (jaws): path M -3 -4 q 6 2 4 8 + mirrored; trigger: line from caliper to index finger. After release: jaw rotate open: second small line rotated 35°, and shank shortens (gap to knot).

Simplify release: draw shank + caliper as small group positioned at knot pre-release, at fixed offset from hand post-release with jaw open. Pre-release caliper at knot (world). Post: caliper at (W.x+22, W.y-4) jaws open; gap visible between caliper & where knot was (knot moved with string) ✓.

Bow hand: local at grip: palm: path M 446 414 q 12 4 12 20 q 0 16 -10 22 q -12 4 -16 -6 q -4 -12 2 -24 q 4 -12 12 -12 Z (right of grip); fingers: 3 arcs wrapping front: M 424 420 q -8 2 -8 8 q 0 6 8 6 (index) similar y 434, 446 (relaxed, slightly open); thumb: M 444 414 q -6 -10 -14 -12 q -6 -2 -8 4 q 0 6 8 8 l 14 6 Z. Wrist from forearm. Sling: from (440,462) curve to wrist (448,470): path M 440 460 q 4 18 16 20 stroke orange 3.

OK, enough planning — write it, screenshot, fix.

One more: FX streaks: group in arrow local? Streaks trail the TIP in world: simpler world lines from tip back: at tip (tx,ty): lines (tx+8..tx+70, ty±3..±10) opacity k_speed. Put in gFX world group, updated.

Chart dot position: x = 40+ k*170?? chart inner: x0=52,w=150 mapping k 0..1; y: bottom=744, top=680: y = 744 - F(k)*60. F: piecewise as above (peak 1 at k .75, to .25). Draw grid line at holding force.

Also during release, dot follows k(t) backwards ✓ automatic.

Pill phases with dot color: idle gray, draw blue, hold amber, release red flash, flight green, settle gray.

Edge case scrubbing backwards past release: everything derived from t → consistent ✓ (arrow free-flight branch by t≥braceTime only; release caliper open if t>4.8 etc.) ✓ deterministic.

Loop wrap: when t crosses END→0: flash fadeDiv opacity .3 for 150ms.

Let me also handle prefers-reduced-motion? skip.

Write chunk 1 now. Keep code clean. I'll include ?t=&paused= params for testing: on load, if param t, set t & pause.

Also during hold phase add minute draw-length creep? Real: holding steady. fine with tremor.

Let me write.

Actually one concern: total JS length. I'll write compact but readable. Go.

Chunk sizes: I'll do 3 writes: (1) head+css+svg static, (2) script part A, (3) script part B + close.

Svg static markup includes: defs, gBg, gCam> (gArcher: torso, neck, head group, draw arm path ids, bow arm), gKick> (gBowStatic: stabilizer group, riser, guard rod, sight group, restBase; dynamic placeholders: limbs paths, cams groups, cables, slide, arrow group, restBristles; gHands (drawHand group, release group); gString (paths); gBowHand; gFX), gLabels, gChart, gTitleCard.

I'll create dynamic elements in JS to keep markup short: e.g., limbs path elements created in JS appended to known group ids.

Define ids: svg, gCam, gKick, bgGroup, torsoPath, neckPath, headG, drawArmUp, drawArmFo, bowArmUp, bowArmFo, stabG, riserP, guardRod, sightG, restBase, bristG, limbT, limbB, camT (translate), camTR (rotate), camB, camBR, cable1, cable2, slideG, arrowG, shaftP, ... string paths: strMain, strServ, strWrapT, strWrapB, peepG, dloopP, knotG, silT, silB, nockDot, handDrawG, relG (release), handBowG, slingP, fxStreaks, labelsG, chartDot, pill, phaseTxt, scrub, etc.

Time to write the actual file. I'll aim for correctness on first pass to minimize iterations but expect 1-2 screenshot fix rounds especially face/hands.

For cam artwork local coords: build via JS group with children at local coords; camT transform = translate(ax,ay); camTR transform = rotate(θ). Nut separate (not rotating): hexNutT/B.

Ribbon builder: function ribbon(pts, w0, w1): sample quadratic at n=10, build left/right offsets by normals, return path d.

pointAlong(polyline pts, dist): walk.

String polyline: [wrapEndT? no: free string from tanT → N → tanB] plus wraps separate paths. Serving segment: pts along middle ±46. Silencers at fractions.

Fisheye check arrow at rest: nock throat at string: nock local (0,0): draw nock piece from x -2 to -12; string passes at world nock (N). Arrow group translate(N) — the string overlaps nock ✓.

During brace idle, arrow nock at (500,400) — between cams' tangents x≈456: string from 456 to 500: slight angle: string not straight vertical — at brace string should be ~straight line tanT→tanB: tanT(455.5,146.8), tanB mirrored (455.5,653.2): straight line x=455.5! But nock at (500,400) → kink of 44px at brace?! Brace height measured from grip: string plane at brace ≈ vertical line through tangents x≈455.5; grip front at 417: brace = 38px?? I set nock brace at 500 earlier (=brace 83px=8.3in — realistic!) but then tangents must be at x≈500-ish?? Tangent x depends on cam position: cams at axle x 426, r 30: tangent x ≈ 426+29.5 = 455.5. For string plane at 500, cams must be at x≈470: set axles rest (470,152)/(470,648), riser pockets (436,...) → limbs lean BACK toward archer significantly (axle 34px behind pocket). Real bows: limb tips roughly above pockets or slightly forward... With reflex risers pockets sit forward. Move pockets forward: pocket (470? ...). Let me restructure: keep axles rest at (462,152): tangent x = 462+29.4=491; nock 500 → small kink 9px fine (string slightly bent at nock at brace — actually real: string straight; nock ON the line: nock x should equal tangent x ≈ 491). Set nock brace = 492, grip front 417 → brace 75px = 7.5in ✓ realistic! Then full draw nock = 492+280=772.

Update: axles rest (462,152)/(462,648); full (498,190)/(498,610)? tips move toward archer+inward: full (500,192)/(500,608). Pockets (452,252)/(452,552): limbs lean back slightly at brace (tip 462 > pocket 452: tip toward archer by 10px ✓ typical deflex-ish look fine). Riser: keep as drawn (back edge ~455, front ~414-420). String plane 492: cable guard offsets to ~530: slide (522,446) etc. Tangents recompute in code anyway.

Sight window: arrow at y=400 passes over riser front (412-417) ✓ rest mounted at (446,400): biscuit center (450,400)? Arrow nock x 492 at brace — rest usually at riser x≈446 — arrow passes through biscuit at (450,400) ✓ shaft spans 192..492 at brace crossing biscuit ✓.

Peep at brace: on upper string at 0.8: from tanT(491?,~147)... compute: tanT with C(462,152), N(492,400): d=250.7? (30,248): d=250, φ=83.1°, α=acos(30/250)=83.1°, tangent angle = φ-α = 0°!! pt = (492,152). Interesting: tangent point directly right of cam center at brace (because N directly below-ish). String vertical line x=492 ✓ makes sense. Bottom mirrored (492,648). Peep brace at (492, 152+0.8*248)=(492,350.4) — right at face?? face at x≤806... peep at 492 far left of eye ✓ fine at brace (peep far from eye until drawn ✓ realistic).

Full draw tangents: C(500,192), N(772,400): d=sqrt(272²+208²)=342.4, φ=37.4°, α=acos(30/342.4)=85°, tangent=φ-α=-47.6° → pt=(500+20.2, 192-22.2)=(520.2,169.8). Upper seg (520,170)→(772,400): len=sqrt(252²+230²)=341.2. Peep s=0.8*341=273 → (520+201.6, 170+184)=(721.6,354) ✓ matches earlier ✓. Nose string line: at y=373: u=(373-170)/230=0.883 → x=520+222.6=742.6 ✓ nose tip (739,374) → string presses 3.6px into nose ✓

Cam rotation sign check with new numbers: at full draw tangent angle changed -47.6° from 0° at brace: tangent point moved CCW (up) by 47.6°... anchor peg local 160°, θ=-150k: full draw peg world 10°: arc from tangent -47.6° increasing to 10° = 57.6° wrap (vs brace: tangent 0 → 160 = 160°). Wrap shrinks ✓ good. Bottom mirrored.

Draw length D: 772-492=280 ✓.

Hand W = N+(10,22): full draw (782,422) ✓ jaw corner (793,416): hand just under jaw ✓. Brace W=(502,422).

D-loop knot at N+(15,0): brace (507,400), full (787,400).

Release shank from strap (W.x+24,W.y-2) to knot: brace: (526,420)→(507,400) short ✓; full: (806,420)→(787,400) ✓.

Draw arm elbow keyframes: k0: (730,498); k0.55: (872,492); k1: (986,460). S=(886,466).

Bow arm: S2(866,508) → E(634,484) → wrist (452,450).

Stabilizer from (420,462) → (298,482). Guard rod (452,428)→(530,452), slide param .82→.66: slide = rod.p(0.82-0.16k) → brace (515.6,447.7)?? compute: rod dir (78,24): p(u)=(452+78u, 428+24u): u=.82 → (516,447.7); holes perp: dir n=(0.956,0.294), perp=(-0.294,0.956): ±8: holes (516∓2.35, 447.7±7.6) → (513.6,455.3),(518.4,440.1) ✓ below arrow 400 ✓.

Cables: top peg local -30° r20 → world angle -30+θt: brace: -30°: (462+17.3,152-10)=(479.3,142)+12off=(491.3,142) → to hole1 (518.4,440.1): vertical-ish ✓; string brace x=492: cable at y=300: 491.3+27.1*(158/298)=505.7 vs string 492 ✓ 14px right ✓. Full draw: θt=-150 → angle -180: peg=(500-20,192)=(480,192)+12=(492,192)→hole( u=.66: (503.5,443.8) perp holes (501.2,451.4),(505.8,436.2) ) take hole top (505.8,436.2): cable (492,192)→(505.8,436) nearly vertical x≈495-506 ✓; string upper from (520,170) to (772,400): at y=300 x≈651 ✓ separation large ✓.

Which hole for top cable? top cable → upper hole (518.4,440.1 at brace); bottom cable → lower hole. ✓

Bottom cable peg local +30° θb: brace (479.3,658)+12 → (491.3,658) → hole (513.6,455.3). ✓

Rest bristles overlay: after arrow.

Sight housing (366,394): distance from riser front 417 → bracket arm from (414,388)-(414,400) to housing right edge (378,394): line. Housing ring: ellipse rx 11 ry 32 stroke 5 #15171a; inner face hint ellipse rx 7 ry 28 stroke #2b2f36 1; pins: 5 bars from top: x=366, from y 366+i10, bar up to 360? pins hang from top: short vertical line from (366, 366+i10) up 6px? Real pins horizontal from side... side view: pins appear as short horizontal bars with dot at left end?? Pins point toward archer; from side you see their sides: short horizontal lines at heights, dots (fiber ends) face archer (not visible side) BUT fiber optic dots glow, visible slightly: draw dot r2.2 at bar end anyway (readable). Bars: from housing right inner (372, y) left to (358, y) with dot at (358,y)?? Dots inside ring near center-left. Colors seq: green, green, red, yellow, yellow? classic: top 3 green/yellow/red... use: #39e75f, #39e75f, #ffd23f, #ff5b4d, #ff5b4d? I'll do green, yellow, red, blue?, white? Keep: G,Y,R,G? whatever: [g, y, r, r, w]? Final: ['#42e36b','#42e36b','#ffd23f','#ff5b4d','#ff5b4d']. Bubble level at bottom inner (366, 418): tube rect + bubble dot.

Peep: ellipse rx 6.5 ry 5 rotate to string angle at peep; hole rx3 ry2.2 dark; ring #d8d2c4? peep usually black/red: use #c8552e orange ring ✓ visible.

String colors: main #3b4a3c (BCY 452X greenish), serving center #20262b?? serving often contrasting: use #c8552e?? too loud; use black serving #22262b with orange nock set. D-loop orange #e06a35 ✓.

Cam accent: orange module + orange arc ring → matches D-loop aesthetic.

Riser color: "OD green/ tan"? Black with subtle green? Choose graphite #23262b with machined edge highlight #4a5058; pockets #15171a.

Limbs camo pattern def: pattern id camoPat w 120 h 120: base #4a5a39; blobs: #33402a (3), #5e6f45 (3), #2a331f (2), some tan #7a7a52 (1). Also shirt/cap camo: reuse pattern scaled (patternTransform scale 1.4) separate id camoPat2 with greener tone? Reuse same for simplicity, different scale.

Skin: #d7a075; shade #b57e54; nail? skip.

Alright, writing files now. For real this time.

Also remember: title card & pill styling.

Let me write chunk 1 (HTML+CSS+SVG static+defs):

I'll write background:

Filters: fB6 (blur6), fB3.

gCam: contains everything.

I also want subtle shadows: drop shadow under riser? skip (air).

Write now. Also add <desc>

After writing all, test with python http server? browser_visit file:// should work. Use file:///tmp/compound_bow/index.html?t=2&paused=1.

Let me produce chunk 1 text.

CSS: html,body{margin:0;height:100%;background:#0b0e12;overflow:hidden;font-family:system-ui,...} #stage{position:fixed;inset:0} svg{width:100%;height:100%;display:block} #pill{position:absolute;top:18px;left:50%;transform:translateX(-50%);padding:8px 16px;border-radius:999px;background:rgba(12,16,20,.62);color:#eaf2f6;font-size:14px;letter-spacing:.02em;display:flex;gap:8px;align-items:center;backdrop-filter:blur(6px);border:1px solid rgba(255,255,255,.08)} #dot{width:8px;height:8px;border-radius:50%;background:#8a97a3} #bar{position:absolute;left:50%;bottom:16px;transform:translateX(-50%);display:flex;gap:10px;align-items:center;padding:10px 14px;border-radius:14px;background:rgba(12,16,20,.66);border:1px solid rgba(255,255,255,.09);backdrop-filter:blur(8px);width:min(860px,92vw)} button{background:rgba(255,255,255,.08);color:#e8eef2;border:1px solid rgba(255,255,255,.12);border-radius:9px;padding:6px 12px;font-size:13px;cursor:pointer} button:hover{background:rgba(255,255,255,.16)} button.on{background:#3f7fbf;border-color:#5b9bd5} #scrub{flex:1;accent-color:#5b9bd5} #fade{position:absolute;inset:0;background:#000;opacity:0;pointer-events:none;transition:opacity .18s} #speeds{display:flex;gap:4px}

Title card inside SVG (gTitle): rect + text.

Now chunk 1:

Actually to reduce risk of id mismatches, I'll put EVERYTHING dynamic creation + static authored shapes both: static authored in markup (bg, torso, head base shapes, riser, sight, stabilizer, rest base, guard rod, chart card, title card). Dynamic JS-created: limbs, cams, cables+slide, arrow, string set, peep, dloop, hands, release, silencers, fx, labels, bristles. OK.

Head markup: <g id="headG"><path id="neck" d="..." fill skinShade/><circle iris><path id="hairBk"/>

I'll finalize coordinates while writing; then screenshot-fix.

Time to actually output the writes. Let me carefully compose.

For the script structure:

const P = new URLSearchParams(location.search); let t = parseFloat(P.get('t')||'0'); let playing = !P.get('paused'); let speed = 1;

const END = 8.2, T_DRAW0=1.0, T_DRAW1=3.4, T_REL=4.8, T_BRACE=5.06;

function kAt(t){ if(t<T_DRAW0) return 0; if(t<T_DRAW1){let u=(t-T_DRAW0)/(T_DRAW1-T_DRAW0); return easeInOutCubic(u);} if(t<T_REL){return 1;} if(t<T_BRACE){let u=(t-T_REL)/(T_BRACE-T_REL); return Math.pow(1-u,0.62);} if(t<T_BRACE+0.7){let dt=t-T_BRACE; return 0.011Math.sin(dt46)Math.exp(-dt6.5);} return 0; } hold tremor added separately when in hold: k += 0.0035sin(t21)*exp(-(t-T_DRAW1)*1.2) etc. Add inside kAt for hold branch.

function geom(t): compute k, axles, tangents (function tangentPt(C,r,N,sign)), string pts, pointAt helper, arrow state, hands, elbows (keyframe lerp with easing), cam θ, slide, cables anchors, etc. Return object g.

function render(g,t): set attributes.

Main loop with rAF.

Init: create elements; chart path; labels; controls events.

I'll write it. Also easeInOutCubic, lerp, V=(x,y) helpers, fmt for path numbers (toFixed(1)).

Watch total length; go.

One more: arrow after exiting frame: at t>5.7 arrow off-screen left; keep rendering (cheap).

Arrow "fully leaves bow" moment nock passes biscuit x=450: nock(t)=450 → 492-1600*(t-5.06)=450 → t=5.086s. Pill: [5.06,5.086] "箭矢离弦", [5.086,5.7] "箭矢离弓 · 飞行". Actually离弦 = leaves string (at brace 5.06) ✓ then 离弓 shortly after ✓ nice.

Pill logic with priority.

Okay writing chunk 1 now — final.

Also include note text top-left title card: "复合弓 · 开弓 → 撒放 特写" sub "双凸轮 | 省力比≈75% | 离弦瞬间".

Chunk 1 below.

Now write the HTML file. I'll write in chunks. Chunk 1: head + CSS + SVG static markup + defs.

The write failed — no error message given. Maybe the content was fine but something else. Let me retry — perhaps a transient issue. Try writing again, possibly in smaller piece.

The write failed again. Maybe the issue is the directory doesn't exist? /tmp should exist. Let me check with shell. Or maybe there's an issue with the content — perhaps certain characters? Let me test with a tiny write first.

Shell works. Maybe the write_file tool has an issue with the content — perhaps the < > in content? Unlikely. Let me try write_file with a small content to see if it works at all.

Small write works. Maybe the content length (~14KB) is causing a problem, or some specific character. Possibly the issue is the ❚❚ or ↺ characters? Or the large content with special XML chars. Let me try writing the full head+style section first (~7KB), then append the rest in pieces.

Actually, maybe it was a transient failure. Let me write the file in 3 parts with append mode, each part moderate size.

That worked. The earlier failures might have been transient. Continue appending part 2: background, archer, bow static.

Now I need to insert the JavaScript before </script>. I'll use edit_file to replace <script>\n</script> with the full script. The script is large (~30KB), might exceed edit limits? Let me write the JS as a separate file and reference it? External js file requires the browser to load it — file:// with separate js should work. But for delivery, a single html folder with index.html + app.js is fine for version manager (html type folder with index.html and assets).

Actually simpler: keep separate file app.js. That keeps each write small.

Let me write app.js in chunks via write_file append.

Now the render function and main loop.

Now link app.js in the HTML — edit the HTML to add script src before closing. Currently HTML has <script>\n</script>. Replace with <script src="app.js"></script>.

Overall structure renders. Issues visible:

Alternative: accept overlap but draw the sight BEHIND the arrow (arrow over sight) — physically arrow is closer to viewer than the sight? Actually the sight is on the near side of the riser (same side as viewer for a right-handed archer's bow... the sight mounts on the side of the riser facing away from the archer... hmm. For a right-handed archer holding bow in left hand, sight faces the archer (on the back of the riser, archer side). In side profile view, we see the bow's side; the sight extends toward the viewer-ish. The arrow is in the center plane. Drawing arrow OVER sight is fine visually.

But the arrow tip passes through the ring region — when arrow flies, it'll cross the ring. With arrow drawn over sight, it just passes over it visually. Acceptable.

Actually looking at the screenshot again: the arrow crosses the sight housing and it doesn't look terrible, but the sight looks cluttered where arrow crosses. I think moving the sight housing slightly down (center y 402, ry 28, pins 370-410) and drawing arrow over it will look fine.

Also the face looks like it tilts down oddly. And the whole head might be slightly too far left relative to torso — face at x 726-811, torso starts ~830. Neck connects 790-862. In the image there's a gap between face and torso at the throat area? Looks okay-ish but throat/chest junction looks hollow.

But wait — in the image, the skin forearm appears ABOVE the green sleeve? Looking: green tube from right goes to about x=634 then skin continues to grip. Hmm actually the image shows: skin-colored arm from grip all the way to x~700, then green from there to torso. That's correct (forearm skin, upper arm sleeve).

Now the BIG issue: draw hand at brace position — it overlaps bow hand at the grip. Real sequence: archer hooks release to D-loop with bow arm extended; at brace the draw hand is at the string (492,400-ish), which is 60px behind grip (430) — so hands are 60px apart. In the image they're close but distinguishable. It reads okay actually — the draw hand is right of the bow hand, at the string. Fine.

Let me now look at full draw (t=4.0) to check the anchor geometry, then release frames.

Full draw (t=4.0) — the geometry is mostly working: string V to nock at jaw, cams rotated, arrow drawn back, vanes near face. Issues:

Alternative: reduce draw length D from 280 to 258: nock at 750 at full draw. Then string at y=373: tangent/N recomputed. N=(750,400). Vanetips at 696-734. Nose at 733 — still touching last vane tip. Move vanes closer to nock: vaneU from -14 to -46 instead of -16..-54. Vanes at 704-736 with nock 750... still near nose.

Actually, real full-draw photos: the cock vane often nearly touches the nose, and the string touches the nose tip. It's fine for vanes to be near the face. The visual problem is mainly that vanes OVERLAP the face making it hard to read. Let me move the head right by ~12px AND reduce D slightly to 265. Nock at 757. Vanes 703-741. Face nose at 745: vane trailing edge at 741 just at nose — plausible "vane almost touching nose" look.

Hmm, but moving the head right means the neck/torso junction also shifts — the head is a separate group; torso static. Face path spans 726-811; shifting +12 → 738-823. Torso starts ~830 at top (830,444). Neck 790-862 → +12 = 802-874, overlapping torso more — fine.

Also the draw arm: elbow E at (986,460) — in the image the draw arm elbow goes off to the right and the forearm (skin) crosses IN FRONT of the face?? Looking at image: the skin forearm from elbow (986,460) goes to W (782,422) — it passes along the jaw/chin area. In the image the forearm appears to pass under the chin — looks acceptable, arm below jaw. But the upper arm (dark sleeve 886,466 → 986,460) is visible going right. OK.

But wait — the string passes through the CAP BRIM region. The cap brim at y 310-336, x 689-758. String at y=325: u=(325-170)/230=0.674 → x=520+252*0.674=690. So string passes at (690,325) — right at the brim's left tip (689,336). Marginal contact — in image it looks like string just misses the brim. OK.

Also the ear is hidden behind... ear at 793-806, y 354-375 — in image I see it faintly. OK.

Face: nose is visible, lips, chin. It reads as a face but slightly "pointy". Acceptable stylization. I might smooth the nose-lips-chin transitions a bit.

But hmm — in the image the draw forearm passes IN FRONT of the bow arm's shoulder... fine.

Actually wait — looking at the image, I see the arrow tip pokes just LEFT of the riser into the sight window area? The tip at 454 vs riser front edge ~412-420 — tip is INSIDE the riser silhouette region (x 412-456 at y 400). At y=400 the riser has the sight window... the riser front edge at y=400: path says front edge around 412-417. So tip at 454 is INSIDE the riser body (between front 414 and back 448 edges)?! At y=400, riser solid from ~412 to ~448 (the grip area 408-460). Tip at 454 would be inside the riser material — impossible. Real: at full draw the arrow tip is just behind the rest (rest at 450), i.e., tip x > 450?? No wait — arrow points LEFT, tip at the LEFT end. Nock at 772, arrow extends left 318 → tip at 454. The rest is at 450. So the tip is just LEFT of (in front of) the rest — meaning tip is in the sight window region, x 454... riser at y=400 spans 412-448 (sight window cut above grip? my riser is solid there). Hmm, the arrow tip at 454 is right of the riser's back edge (448) — just behind the riser, floating above the grip. That's fine physically (tip just behind the riser back face at full draw = "draw length slightly long" — many archers draw so the point is even with the rest). Visually in image: tip is just right of riser, near the bow hand. Acceptable.

But 箭尖 at release end (brace): nock 492, tip 174 — tip well past the riser ✓.

Now the release frames: t=4.92 (mid-power), t=5.2 (flight). Also fix list:

A. Head/hat: remove hair blob sticking out; make cap crown cover back of head; slight face smoothing. B. Torso camo scale down (add patternTransform or new pattern camoPatSm scale 0.5). C. Move head right ~10px? Let me check the flight frame first. D. Vanes closer to nock slightly.

Let me check t=4.92 and t=5.25 first.

Release sequence works: at 4.93 the string is mid-return pushing the arrow, hand stayed at jaw, caliper off the D-loop. At 5.25 the arrow is flying toward the target with vanes, string back at brace, follow-through hand drift.

Issues to fix:

Remaining fixes: A. Head: fix hair blob + cap back + neck junction. B. Torso camo scale smaller. C. Shorten arrow a touch (306), move vanes slightly closer to nock. D. Maybe nudge face: the mouth/chin area — the upper lip notch. Minor. E. Also at t=0.5, the draw forearm crosses over the bow hand region — fine.

Also the neck: current path M 790 398 C 798 424 812 444 834 454 L 862 452 C 844 436 830 414 822 392 Z. The problem: it creates a wedge that doesn't visually connect to the face outline (face ends at jaw 794,417 and ear 803,389). Let me redraw: neck from under jaw (796,410) down-right to (840,458) and from ear-back (806,380) down to (860,452): path M 794 404 C 800 428 812 448 834 458 L 866 456 C 848 440 834 416 826 388 C 816 396 804 402 794 404 Z.

Face path adjustments:

Cap: extend crown back/down: current crown ends (866,326). New: C 854 289 868 304 866 326 → add C 866 340 860 350 852 356 (cover back of head down to hairline) then close back along bottom: C 830 344 800 336 ... hmm simpler: crown path: M 746 314 C 752 289 786 281 820 285 C 852 289 866 303 866 324 C 866 338 860 348 850 354 C 838 344 826 338 810 334 C 788 328 766 324 746 322 Z. And hair under cap back: small wedge at (848,350)-(862,370): M 850 352 q 10 6 8 20 l -12 4 q 0 -14 4 -24 Z — small sideburn/back hair, subtle.

Actually the "hairBk" blob currently at M 856 318 q 10 8 8 26 l -12 5 q 2 -18 4 -31 Z — spans 852-866, y 313-349. In the screenshot it renders as a dark blob sticking out to the RIGHT of the cap crown (crown ends at 866). It looks like a flap. Replace with the subtler version tucked under an extended crown.

E. Also adjust cap brim: currently brim tip at (689,336) — fine.

F. Torso/collar: collar path M 822 440 q 34 22 62 16 l -8 -24 q -28 6 -54 8 Z — after neck change, collar from ~(824,448). Keep, adjust slightly to overlap new neck bottom (834-866, 456-458): collar M 820 446 q 36 20 66 14 l -8 -22 q -30 6 -58 8 Z.

G. Camo scale: add second pattern camoPatSm with patternTransform="scale(0.55)" for torso/drawArmUp/bowArmUp... but bowArmUp uses stroke color (solid) not camo. Torso uses camoPat. Change torso fill to camoPatSm. Also cap crown maybe keep large pattern (cap looks fine).

H. Arrow: L 318→308; vanes: vaneU -14..-50; shaft front accordingly; crest at -140/-128; tip at -308.

Also for streaks tip reference: tip.x = nock.x-318 → update to 308. In render: const tip={x:g.nock.x-318,...} → make it use a constant ALEN. Let me add const ALEN=308 and use in drawArrow and render.

I. In geom(), the follow-through Wf has weird leftover: Wf={x:790+14e2+ (k<0.99?0:0),...} — clean that up: x:790+14e2. But note at t in [rel, brace], I set Wf=W inside if(t<T.brace) — but W during release = N+10 which MOVES with string — the hand should NOT move with the string after release. Fix: from t>=T.rel, hand should stay at the anchor position (790,422) regardless. Currently: W computed from N (moves), and Wf correction only applies when t>=T.brace... between rel and brace (4.8-5.06), Wf={x:W.x,y:W.y} = moves with N! In the 4.93 screenshot the hand appears near the string/arrow which is moving forward — the hand at (674+10=684,422)?? But in the image the hand looks like it's at ~x=1050 screen... let me look: at 4.93, hand appears still at the jaw area (dark fist at ~(1050,545) screen ≈ (790,420) world). Hmm wait, in the 4.93 image the fist is right where the string nock region is... The string nock at 4.93 is at 674. The fist in image is at the jaw (string passes through it). I see the fist AT the string — because W follows N. It reads as "hand still holding" which is wrong but subtle. Fix: released → W=(790,422) fixed (+ follow-through after brace).

In geom: if(t>=T.rel){ W={x:790,y:422} } (before follow-through lerp). Let me restructure: compute W_draw = N+(10,22) always for drawing; then if released: W = {x:790,y:422} and apply follow-through drift after brace.

Also elbow E similar: E keyframes depend on k; after release k→0 would swing elbow back down — but with the same fix: after rel, freeze E at (986,460) + drift.

J. Also at t between rel and brace, the arm paths use Ef/Wf — with fix they're static ✓.

K. The peep at 0.80 of upper length — at brace it's at (492, 350) — near the top pin aim? fine.

L. Minor: drawArmFo stroke color #c08454 darker than face — reads as shadowed far arm — keep.

M. The face eye: iris at (764,351) — looking left ✓.

N. Also torso front edge: at y~520 x~950 — the draw elbow at (986,460) is INSIDE torso region?? Torso at y=460: front edge ~ curve from (830,444) to (952,526): at y=460 x≈875. Elbow at 986 > 875 — outside (right of) torso ✓ visible. OK.

O. Chart: also during release the dot should zip back along curve — k goes to 0 ✓.

P. One more: the top cam at brace — the string wrap arc sweep: looks like string wraps the RIGHT side of cam (toward archer). Real: string wraps the cam's outer groove... from side view, free string leaves the cam tangent toward the nock; the rest of string wraps around the cam. My wrap goes from tangent (right side, angle ~0 at brace) counterclockwise-increasing through bottom to 160° — i.e., wraps around the BOTTOM-LEFT of top cam. In the t=0.5 image, the wrap covers bottom-left of top cam ✓ plausible.

Q. The slide: drawn rotated +90 — looks fine.

R. Bristle rest: okay.

Also — potential improvement for realism: add a subtle "arrow pass through whisker biscuit" — skip.

S. In the 5.25 shot: arrow's orange vanes visible near target ✓ nice; green nock ✓.

T. The bow tip: axle nut hex — currently circle. fine.

U. Also noticed: at 4.93, the top cam: string wrap looks okay, cable visible. The cam rotation reads ✓.

V. The title bar overlaps "凸轮" label leader a bit — fine.

W. Bottom-left chart overlaps 平衡杆 label leader slightly — acceptable.

X. Face: add subtle smile/focused mouth line and nostril? Small touches: mouth line M 744 391 q 4 2 7 1 stroke; nostril dot at (733,371). Skip nostril—too small.

Let me also double-check the "hair" and cap junction at 5.25: the dark blob reads like a back brim of a bucket hat. I'll fix as planned.

Y. Neck in 5.25: I see skin wedge from jaw going down at an angle, then a separate collar — there's a visible concave gap between chin/jaw underside and neck top. The new neck path should fix.

Z. Also the shoulder of the draw arm: sleeve (886,466)→elbow — in 5.25 the dark green sleeve visible ✓.

Additional realism: after arrow leaves (t>5.6), maybe show the arrow hitting the target? Arrow exits frame left at ~5.6; target at x=64: nock reaches x=64 at t=5.06+(492-64)/1600=5.33. The arrow passes through the target zone around t=5.3-5.5. In the 5.25 shot the arrow tip is near x=64-ish... tip at nock-308: at t=5.25, nock=492-16000.19=188, tip=-120 — tip already off-frame left, nock at 188. Target at x 18-110. So the arrow crosses the target plane at t≈5.3-5.5 — visually it would fly just over/through the blurred target. It reads as "flying toward target" ✓ good enough. Could add impact: at t when tip reaches target x (tip = 64 → nock=372 → t=5.06+(492-372)/1600=5.135), stick the arrow INTO the target and stop it there? That would be a nice touch — arrow stops at target with a tiny shake. But then arrow disappears from flight early... The target is heavily blurred; arrow stopping there reads as a hit. Let's do it: if tip reaches x<=64 before leaving, clamp: arrow stops with tip at 64, stays (with slight settling angle). Compute tHit=5.135; after that, nock.x = 64+308=372 fixed (until loop end). Small impact quiver: angle wobble for 0.4s. This is a nice payoff. But wait — target is at y=414 center; arrow flies at y=400 + drop. At t=5.135, drop=200.0756²/... y=400+20*(0.075)^2≈400.1 — arrow at y≈400 hits target upper area (target spans 358-470 at x 18-110) ✓ hits upper-left of center — plausible.

Hmm, but the arrow stops abruptly at 1600px/s → 0. Real arrows stick. Add tiny embed shake. OK implement: tHit: tip x = nock-308 = 64 → nock=372 → dt=(492-372)/1600=0.075 → tHit=5.135. if t>=tHit: nock.x=372, plus settle: small angle oscillation exp decay; nock.y stays ~400. tipV=0 (streaks off).

But then during 5.135-8.2 the arrow is stuck in target — visible ✓ nice.

Also make sure arrow renders ON TOP of blurred target (target is in bg, arrow in gKick → over bg ✓).

Also the "phase" text at t 5.135+: '命中靶心·随势' — change last phase text at land: if t>=tHit return '箭矢命中 · 随势余振'.

Let me now apply all edits:

Edit 1 — capCrown: old: <path id="capCrown" fill="url(#camoPat)" d="M 746 314 C 752 289 786 281 820 285 C 854 289 868 304 866 326 C 830 315 786 310 746 322 Z"/><path id="capCrown" fill="url(#camoPat)" d="M 746 314 C 752 289 786 281 820 285 C 852 289 866 303 866 324 C 866 338 860 349 849 355 C 838 345 824 338 808 334 C 786 328 765 324 746 322 Z"/>

hairBk: old: <path id="hairBk" fill="#3a2c1e" d="M 856 318 q 10 8 8 26 l -12 5 q 2 -18 4 -31 Z"/><path id="hairBk" fill="#3a2c1e" d="M 847 352 q 9 5 8 19 l -11 4 q 0 -13 3 -23 Z"/>

Also the crown-stroke line "M 746 314 C 786 305 830 310 866 326" — keep (hat band).

neck: old: <path id="neck" fill="#c98f60" d="M 790 398 C 798 424 812 444 834 454 L 862 452 C 844 436 830 414 822 392 Z"/><path id="neck" fill="#c98f60" d="M 792 402 C 799 428 812 448 834 458 L 868 456 C 850 440 836 416 826 388 C 816 396 804 401 792 402 Z"/>

collar: old: <path id="collar" fill="#37432c" d="M 822 440 q 34 22 62 16 l -8 -24 q -28 6 -54 8 Z"/><path id="collar" fill="#37432c" d="M 820 446 q 38 20 68 14 l -9 -22 q -30 6 -59 8 Z"/>

camoPatSm: add after camoPat pattern: <pattern id="camoPatSm" width="130" height="130" patternUnits="userSpaceOnUse" patternTransform="scale(0.55)"> Simplest: duplicate pattern content. Or use <pattern id="camoPatSm" ...> with same paths. I'll insert.

torso fill: url(#camoPat) → url(#camoPatSm).

drawArmUp stroke #46543a solid — fine.

app.js edits:

Careful with geom: THIT needs to be accessible in render for streaks (tipV handles it). Also arrow hide condition nock.x<-360 — with stop, nock stays 372 → always visible after hit ✓ good.

Edge: scrubbing before THIT then after — fine.

One more fix: at t slightly after T.rel, bend=2.2*sin(...)+1.2 — arrow flex during power — keep.

Also remove the weird (k<0.99?0:0) artifact.

Now also double check drawArrow local L const: currently const L=318,sh=2.6; inside drawArrow — change to use ALEN (global). And $('shaft') path builds with L*0.5 and tipX=-L — fine.

tipPt: from (tipX+14) to tipX — fine.

Implement edits now.

Wait — the arrow stop at nock.x=372 means tip at 372-308=64 = target x. But the arrow "leaves bow" phase: nock passes rest x=450 at t=5.06+(492-450)/1600=5.086 — the T.off=5.12 close enough.

Also the arrow flying through the sight housing region — the arrow crosses the sight at y=400 — sight at (366,394) — the arrow passes THROUGH the sight ring around t when nock is between 366+308=674 and 366... nock from 674 to 366 — but arrow stops at nock=372! Tip at 64. The arrow shaft then spans 64..372, crossing the sight at 366 permanently after hit. The shaft will visually rest across the sight ring. Hmm — the sight is in front of the riser at x=366; the arrow flying at y=400 would pass just left of the riser... but the sight ring at x 355-377 y 362-426 is exactly in the arrow's path! Physically, the arrow CANNOT pass through the sight ring — the sight is beside the arrow plane (offset toward viewer). Since we draw a pure side view, the arrow passes "behind" the sight (sight is on the near side of the bow facing the archer/viewer). So drawing the sight OVER the arrow would be more correct! The sight is between viewer and arrow.

Currently order: sightG inside bowG BEFORE dynBow (which contains arrow). So arrow is drawn OVER sight. I should move the sight to render after the arrow. But the arrow passes through the ring visually either way — with sight over arrow, the ring stays intact and arrow disappears behind it briefly — more correct depth cue. Let me move sightG to after dynBow within bowG... actually dynBow is inside bowG; I can just move the <g id="sightG"><g id="dynBow">. But dynBow also contains limbs/cams/rest/bristles — sight before restBase is fine.

Wait, but the sight is mounted on the BACK of the riser (archer side) — for a right-handed archer, yes, sight is on the side facing the archer. In a pure profile from the archer's left side... hmm, we (viewers) are looking at the archer's left side (their face in profile). The bow's left side... The sight faces the archer, i.e., toward the right (and slightly toward viewer if viewer is on the archer's side). In profile, depth ordering is ambiguous, but the convention that avoids the visual contradiction (arrow passing through a solid ring) is to draw the sight in front of the arrow. Move sightG after dynBow.

Also the stabilizer — same issue: stabilizer extends forward-left from the riser at (421,461)→(282,483); arrow at y=400 — no crossing. Fine.

Also the arrow at rest (t=0) spans 184..492 at y=400, crossing the sight at 366 — with sight drawn over arrow, looks correct.

Now also fix: arrow stuck at target spanning 64..372 — it also crosses the sight (366). With sight over arrow: shaft disappears behind sight ring — looks like the arrow is still nocked?? After the hit, the arrow spans from the target back to x=372 — which is right at the sight (366)! It would look like the arrow is still on the bow. Hmm! The arrow stops with nock at 372 — but the nock should be near the target too: arrow length 308, tip at 64 → nock at 372. A 308px-long arrow with tip in the target — yes the tail extends back to 372, near the bow (riser front 412). Real: arrow shot from ~20m would be entirely at the target — but our scale compresses distance; the target is only ~430px from the bow. The arrow tail ending near the sight looks odd — like it spans bow-to-target.

Better: let the arrow pass THROUGH and embed: tip enters target, arrow continues decelerating — arrows stick with tail out. The distance bow→target (430px ≈ at 10px/in = 43in = 1.1m!) — the target is absurdly close in scale terms, but it's "background depth" (it's blurred = far away, appears small). The blur implies the target is far; sizes aren't to scale with the foreground. So the arrow shouldn't literally stop AT the blurred target graphic with correct occlusion...

Cleaner solution: let the arrow fly off-frame (as before), and DON'T stick it. But the visual of hitting the target is satisfying... Alternative: when the arrow tip reaches the target's x, fade the arrow out quickly while spawning a tiny "hit" puff at the target + keep a small arrow stub drawn in the target (a short line sticking out of the target, static after hit). The stub: draw a short arrow-tail segment at the target (line at y≈404, x 60-110, tiny vane hint) appearing at t>=THIT. That reads as "arrow stuck in target" without the impossible shaft across the whole scene.

Implement: in render, if t>=THIT: hide arrowG (or keep arrowG showing only if nock.x>-20... at THIT nock=372 → hide), show hitStub (a group in bg? needs to be over bg target but under foreground — put stub in fxG, static position): line from (58,401) to (108,398) width 4 black + tiny orange vane marks at right end + small dust circle burst at impact for 0.3s.

Phase text: at THIT..land: '箭矢命中 · 随势'. Already set.

Let me implement: add hitStubG to fxG in app.js creation: group with: impact burst (3 arcs), shaft line, 2 vane ticks. Update in render: show when t>=THIT (burst only first 0.35s).

Also revert arrow hide logic: arrowG display none when t>=THIT or nock.x<-360.

geom: remove the clamp-stop; keep flying (nock.x keeps decreasing); tipV=1 until THIT then 0. Ang/bend decay continues — fine, arrow hidden anyway.

Edit geom accordingly: replace the stop-branch: if(t>=T.brace){ const dt=t-T.brace; nock.x=BRACE_X-1600dt; nock.y=NOCK_Y+20dtdt; const live=nock.x>372?1:0; tipV=live; ang=rad(2.2)sin(dt44)exp(-dt3.2)...; bend similar; }

THIT already = brace + (492-372)/1600 = 5.135. In render: arrowG.style.display=(t>=THIT||g.nock.x<-360)?'none':'';

Add hitStub creation after twang: const hitStub=el('g',{display:'none'},fx); shaft: el('line',{x1:60,y1:402,x2:112,y2:399,stroke:'#17181a','stroke-width':4,'stroke-linecap':'round'},hitStub); vanes: two short orange ticks at (100-108): el('line',{x1:100,y1:396,x2:110,y2:393,stroke:'#ff7a1a','stroke-width':3}) and (x1:100,y1:406,x2:110,y2:409). burst: 3 arcs around (58,402): path quarter arcs — reuse twang style; make 3 circles stroke white opacity animated: el('circle',{cx:58,cy:402,fill:'none',stroke:'rgba(255,255,255,.8)','stroke-width':1.5}) x3 → animate r/opacity for dt<0.35.

In render: const hit=t>=THIT; hitStub.style.display=hit?'':'none'; if(hit){const dh=t-THIT; burst circles: r=4+i7+dh90, opacity=dh<0.35?0.7*(1-dh/0.35):0}

Good. Implement edits now.

Also move sightG after dynBow in HTML.

Improvements landed: cap looks better, camo scale on torso is finer now, hand stays at anchor during release.

Remaining issues:

Hmm, but actually there's a subtle issue: hitStub is in fx (inside gKick). At t≥THIT the kick has decayed. OK.

Real physics: the arrow can't stop instantly; it embeds over ~10cm. Visually, since the target is "far" (blurred), the arrow should shrink as it approaches (perspective) — we don't have perspective.

Cleaner: make the arrow fly PAST the target plane quickly and off-frame left (as originally), skipping the stub entirely. The target is heavily blurred; an arrow disappearing behind/near it reads as a hit anyway. But then "命中" phase text is unsupported visually...

Alternative: keep arrow flying off-frame; at THIT show only the stub in the target (arrow already near target: at THIT arrow spans 64-372, tip at target). Fade the flying arrow out over ~0.06s right at THIT while fading the stub in. A quick crossfade at the moment the tip touches the target will read as "arrow enters target". The tail-at-372 problem: at that instant, most of the shaft (x 110-372) is between bow and target — visually this is the arrow in flight arriving — fine, it crosses the frame. The crossfade hides the impossible instant-stop.

Even simpler and cleaner: speed the arrow up so it clears the frame BEFORE THIT matters... no.

Let me do the crossfade: arrowG opacity = 1 for t<THIT-0.05, ramps to 0 by THIT+0.03; hitStub opacity ramps in from THIT-0.02 to THIT+0.05. Both groups support opacity attr.

Actually hold on — is the arrow really spanning bow-to-target at THIT? nock=372, riser front at ~414. So tail at 372 is LEFT of the riser (in front of the bow) by 42px. The shaft from 64 to 372: from target to just in front of the bow. That's a full arrow's length in front of the bow — visually it looks like the arrow is ALMOST done passing through the bow's plane... it reads as the arrow having just left the bow and reached the target — since the target is meant to be far away (depth compression), having the full arrow span the gap momentarily then crossfade into the stub is acceptable and standard in animation. OK do crossfade.

Also the label 毛刷箭台 leader points to (450,400) — fine.

Let me apply the crossfade fix and enlarge stub slightly. Also double check t=2.2 (mid-draw) for cam rotation mid-state and the draw arm elbow mid-position.

t=2.2 (mid-draw) looks good: cams mid-rotation, limbs flexing, string V forming, arrow half back, draw arm elbow mid-lift. The elbow at mid-draw (872,492) — the forearm from (872,492) to hand at ~(652,422) — in image the forearm crosses in front of the chest — looks natural ✓.

t=5.15: the hit crossfade happened — I can see the faint arrow tail near the target (left edge, semi-transparent shaft + orange vane hint) and the streak remnant. Looks acceptable. The stub reads as an arrow stuck in target at a glance.

Remaining polish items:

Now final checks:

One more consideration — at t=2.2, the draw hand: fist at W=N+(10,22) — I see it holding near string ✓ with release shank to D-loop ✓.

Minor aesthetic items I could still address: a) The face at full draw: the string seems to pass slightly behind the nose tip (nose overlaps string). Looks fine. b) The cap looks good now. c) The chart overlaps nothing important ✓. d) The 'D环+撒放器' label leader points to the knot ✓.

I think there's one more worthwhile addition for the "特写/完美还原离弓瞬间" requirement: during the release window (t in [4.8, 5.2]), add an inset "慢动作放大镜"? That's heavy. The slow-mo button + scrubber covers it.

Also check t=7.0 end-settle and idle again after fixes? Idle unchanged. OK.

Performance: rAF with attribute updates — fine.

One more possible bug: along() for peep uses g.upLen*0.80 — during release oscillation k goes slightly negative; fine.

Another check: scrubbing to before THIT after hit: hitStub hidden, arrow visible ✓ deterministic.

The version manager: project_dir must contain index.html — /tmp/compound_bow has index.html + app.js. But /tmp doesn't persist... The version manager presumably snapshots the directory. Rules say deliverables go to /mnt/agents/output. For html type, "use the plain HTML folder that contains index.html". I'll copy the project to /mnt/agents/output/compound_bow/ and also to /mnt/agents/work (source preservation), then build_version with project_dir=/mnt/agents/output/compound_bow, type=html.

Wait — can files under /mnt/agents be executed? "nothing under it can be executed" refers to binaries/chmod; serving static html for version manager is the standard flow (it reads the files). OK.

Let me copy files and build version. Also delete test.txt.

The version manager returned only a version ID (no URL). Per the rules: "when it returns only a version ID, say just that the version was saved and give the ID."

Done. Summarize the deliverable concisely.