L-system tree · glm-5.3-flash
Output generated Cost / run $0.0070 Runtime 293.1s
Prompt for this run
Build an animated L-system tree using the provided p5.js library. Use HTML, CSS, and JavaScript as needed. Write it to `index.html` in the current working directory using your file tools. Inline your own CSS and JavaScript. Do not use external assets, CDNs, or network requests. Use the provided `p5.min.js` (global `p5`) through a plain local script tag; the runner will inline it into the final artifact. Required behavior: - Define an axiom, explicit production rules, and an angle for a branching L-system. Expand the grammar and interpret it to draw a connected trunk and branches; an unrelated random-line drawing is not sufficient. - Show progressive growth from the trunk toward branch tips. Once grown, the tree sways gently in the wind while child branches remain attached to their parents. - Provide a generation control from 1 to 5 and Regrow. Changing generation or pressing Regrow restarts growth using the same chosen grammar. - Bound grammar expansion and keep the whole tree visible at every supported generation. - Use procedural graphics. Choose branch styling, leaves, colors, and the particular branching grammar freely. Verify: Sample branch growth and inspect visible parent-child connections. Change the generation setting and check that growth restarts with a different branching structure. If growth has completed during inspection, sample the wind motion as well.
TAKE IT TO CODE
A single self-contained HTML file — copy it and open in any browser, or reuse the prompt with your own pi-agent run.
RUN
METRICS
Transcript · 51 messages
Build an animated L-system tree using the provided p5.js library. Use HTML, CSS, and JavaScript as needed. Write it to `index.html` in the current working directory using your file tools. Inline your own CSS and JavaScript. Do not use external assets, CDNs, or network requests. Use the provided `p5.min.js` (global `p5`) through a plain local script tag; the runner will inline it into the final artifact. Required behavior: - Define an axiom, explicit production rules, and an angle for a branching L-system. Expand the grammar and interpret it to draw a connected trunk and branches; an unrelated random-line drawing is not sufficient. - Show progressive growth from the trunk toward branch tips. Once grown, the tree sways gently in the wind while child branches remain attached to their parents. - Provide a generation control from 1 to 5 and Regrow. Changing generation or pressing Regrow restarts growth using the same chosen grammar. - Bound grammar expansion and keep the whole tree visible at every supported generation. - Use procedural graphics. Choose branch styling, leaves, colors, and the particular branching grammar freely. Verify: Sample branch growth and inspect visible parent-child connections. Change the generation setting and check that growth restarts with a different branching structure. If growth has completed during inspection, sample the wind motion as well.
thinking
Write a p5 L-system tree. Use segment-based growth: expand string to generation N, interpret into segments, each segment has growth progress based on depth, sway via angle offsets oscillating.
Simplest: parse string into segments (each F = segment with start point computed at build time from base angles). Store each segment with absolute base position/angle and length; growth reveals segments progressively in order along the string; sway adds oscillating angle to each segment scaled by depth, applied around each segment's start.
Implementation: build segments iteratively: simulate turtle with position, angle, stack; each F becomes segment {x,y,angle,len,depth,order}. Draw: progress parameter t (0..1) global; each segment drawn fraction based on (order/total). Simpler: animate per-segment: segment i drawn when global progress > i/total, partial. That gives tip-ward growth. Sway: rotate each segment around start by sin(time + order*0.3)*0.02*(depth+1), and children drawn starting from segment end — but if parent sways, child start point must follow. So draw recursively: since segments are ordered along string and children immediately follow parents in draw order, compute positions on the fly during draw in string order with accumulated transforms. But partial parent growth: child tip should attach at parent's grown tip. Handle: compute effective angle per segment incl. sway, then position accumulates: child start = parent end where parent end = start + dir*len*growthFrac. If parent not fully grown, child attaches at that partial tip — fine, since growth order means children appear after parents complete? With per-order progress, child growth starts only when progress passes its index, parent (lower index) fully grown by then. Good.
So draw pass: iterate segments in order, maintain pos/angle; angle = seg.angle + sway(seg, t). length drawn = seg.len * clamp((progress*total - i),0,1). Update pos by full len always? No — pos must advance only by grown length so later segments attach at tip. But if parent fully grown, pos advances full. Since later segments have higher index, they're only drawn when fully grown anyway. So pos += grownLen works.
Sway offset: angle += sin(time*1.5 + i*0.15)*0.03*(1+depth*0.6)*windFactor... apply also during growth (fine).
Leaves: at segments with no children (or every k-th at ends), draw leaf when grown. Mark leaf if segment is last F before ] or end. Simple: mark leaf=true when next token is ']' or end of branch.
Grammar: axiom F; rule F -> FF-[-F+F+F]+[+F-F-F], angle 22°. Gen 1..5, expansion bounded: limit string length, if exceeded cap F count. Length grows fast; gen 5 ~ 4^... F-> has 4 F's plus? Let's do F -> F[+F]F[-F]F[+F]: 5 F's, gen5 = 5^4=625 F's, fine. Better shape: F -> F[-F]F[+F][F]? Use classic: F -> FF-[-F+F+F]+[+F-F-F] (4 F's) → gen5 1024 F, fine.
UI: select generation 1-5, Regrow button, HTML controls overlaying canvas.
Growth progress: increments; duration scales with segment count.{"command":"ls /tmp/job-Lk7Lr2"}p5.min.js
index.html (5169 bytes)Successfully wrote to index.html
thinking
Problem: bracket handling in draw — I dropped it. Segments store idx but not bracket structure. I need to handle [ and ] during draw. Better: store tokens array and process during draw: for tokens, F uses segments[idx] with growth, [ push (x,y,a), ] pop. Let me rewrite the draw to iterate tokens. Also random(-8,8)*0 is silly; and fill(hsb?) — default colorMode RGB, fill(60, hue, ...) wrong. Fix leaf color: use colorMode HSB temporarily or compute RGB. Simpler: fill with lerp greens: color(60+20*sin, 120, 60). Let's rewrite.
index.html (5483 bytes)Successfully wrote to index.html
thinking
Concern: fit at gen 5. Expansion: F→ has 5 F's? Rule "FF-[-F+F+F]+[+F-F-F]" has F count: 2 + 3 + 3 = 8 F's. Gen 5: 8^4 = 4096 F's. String length gen5: len ~ 8*len prev… gen1 len 18, gen2 ~ 140, gen3 ~1100, gen4 ~8800, gen5 ~70000 > MAXLEN 60000 → capped, so gen5 ≈ gen4 expansion? Actually expansion loop: builds out, if out.length > MAXLEN break without assigning. So gen5 = gen4 result (8^3=512 segments). Tree size: 512 segments × len ~ 320/2.2^4 ≈ 13.7→ min 13? 320/23.4≈13.7→13. Total extent could be big. Horizontal spread with 22° branching: rough tree width maybe ~ 20-25 × len? With len 13, width ~300px — fine, but trunk height: segments per path depth... depth up to 4, path length up to sum of consecutive F. Should fit. But gen3 has 8^2? wait gen n: axiom expanded n times. gen1: 1 F? No—gen1: one expansion → 8 segments. Hmm, "generation 1" gives 8 segments, small tree. Maybe axiom should be 'F' but gen1 tree small is fine. Actually to have gen1 a small tree, fine. But baseLen formula: min(13, max(4, 320/2.2^(n-1))). n=1: 13 (clamped), tree height ~ 8 segs. n=3: 320/4.84≈66→13. n=5: 320/23.4≈13.7→13. Hmm max 13 always except large n. So len mostly 13 always — tree size scales with segments. Gen4 (512 segs) extent: path max consecutive F count: rule has max 2 consecutive F; with brackets resetting... trunk: F F then branch. Path length along a branch: at most ~ 2F + sub-branch. Tree height maybe ~ 6-10 × len ≈ 130px?? Actually branching spreads. Tree might be too small/large? Hard to compute; just test in browser. Wait gen3: 8^2=64 segments, at len 13, tree maybe ~100px tall — small. Let's just test visually. Also 'F' count: "FF-[-F+F+F]+[+F-F-F]" → FF (2), [-F+F+F] (3), [+F-F-F] (3) = 8. Yes. Test in browser.
{"action":"screenshot"}Frame 1, +0ms
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{"console":["warning: An iframe which has both allow-scripts and allow-same-origin for its sandbox attribute can escape its sandboxing.","log: Did you just try to use p5.js's radians() function? If so, you may want to move it into your sketch's setup() function.\n\nFor more details, see: https://github.com/processing/p5.js/wiki/p5.js-overview#why-cant-i-assign-variables-using-p5-functions-and-variables-before-setup","error: radians is not defined","error: Cannot access 'gen' before initialization"],"dom":"L-SYSTEM TREE\nGenerations:\n1\n2\n3\n4\n5\nRegrow\nGrowing…\nAxiom: F\nF → FF-[-F+F+F]+[+F-F-F]\nangle: 22° · + right · − left · [ ] branch","images":"attached"}
thinking
radians() called before setup (global const ANGLE). Fix: compute in setup or use Math.PI/22/180.
`radians()` was called before setup. Fixing:
{"edits":[{"newText":"const ANGLE = 22 * Math.PI / 180;","oldText":"const ANGLE = radians(22);"}],"path":"index.html"}Successfully replaced 1 block(s) in index.html.
{"action":"reload"}Frame 1, +0ms
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{"console":["warning: An iframe which has both allow-scripts and allow-same-origin for its sandbox attribute can escape its sandboxing."],"dom":"L-SYSTEM TREE\nGenerations:\n1\n2\n3\n4\n5\nRegrow\nGrowing… (512 segments)\nAxiom: F\nF → FF-[-F+F+F]+[+F-F-F]\nangle: 22° · + right · − left · [ ] branch","images":"attached"}
thinking
Growth started. Let it finish and screenshot to check size/fit.
{"action":"motion"}Frame 1, +0ms
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{"console":["warning: An iframe which has both allow-scripts and allow-same-origin for its sandbox attribute can escape its sandboxing."],"dom":"L-SYSTEM TREE\nGenerations:\n1\n2\n3\n4\n5\nRegrow\nGrown — swaying (512 segments)\nAxiom: F\nF → FF-[-F+F+F]+[+F-F-F]\nangle: 22° · + right · − left · [ ] branch","images":"attached"}
thinking
Tree looks good, connected, swaying (frames differ). Fit at gen 3 fine. Test gen 5 fit and gen 1.
Looks good — connected branches, leaves, and visible sway between frames. Now check gen 5 and gen 1 fit:
{"action":"select","text":"5"}Validation failed for tool "browser": - action: must be equal to constant - action: must be equal to constant - action: must be equal to constant - action: must be equal to constant - action: must be equal to constant - action: must be equal to constant - action: must be equal to constant - action: must be equal to constant Received arguments: { "action": "select", "text": "5" }
{"action":"click","x":132,"y":72}Frame 1, +0ms
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{"console":["warning: An iframe which has both allow-scripts and allow-same-origin for its sandbox attribute can escape its sandboxing."],"dom":"L-SYSTEM TREE\nGenerations:\n1\n2\n3\n4\n5\nRegrow\nGrown — swaying (512 segments)\nAxiom: F\nF → FF-[-F+F+F]+[+F-F-F]\nangle: 22° · + right · − left · [ ] branch","images":"attached"}
{"action":"click","x":154,"y":194}Frame 1, +0ms
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{"console":["warning: An iframe which has both allow-scripts and allow-same-origin for its sandbox attribute can escape its sandboxing."],"dom":"L-SYSTEM TREE\nGenerations:\n1\n2\n3\n4\n5\nRegrow\nGrown — swaying (512 segments)\nAxiom: F\nF → FF-[-F+F+F]+[+F-F-F]\nangle: 22° · + right · − left · [ ] branch","images":"attached"}
thinking
Dropdown click didn't select 5 (still shows 3, 512 segments). Select via JS instead. Use key/type? Easier: use keyboard on select — set value via browser "type"? Instead use bash? Can't reach page JS. Try clicking option at its coordinates — options listed at y:96(1),117(2),146(3),170(4),194(5). I clicked 194 but tree redrawn with same 512 seg... wait gen5 gives 512 too (capped). Actually gen4 = 8^3=512, gen5 capped to gen4 result also 512 segments. So maybe it did select 5 and it's identical count! Status says 512 segments, same as before. Hmm, but select still displays "3". Did onchange fire? Can't tell. Let me verify via key: press down arrow on select? Try keyboard: click select, then key Down twice... Simpler: check tree shape differences. Let me click select and use keys.
{"action":"key","text":"screenshot"}keyboard.press: Unknown key: "screenshot"
{"action":"screenshot"}Frame 1, +0ms
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{"console":["warning: An iframe which has both allow-scripts and allow-same-origin for its sandbox attribute can escape its sandboxing."],"dom":"L-SYSTEM TREE\nGenerations:\n1\n2\n3\n4\n5\nRegrow\nGrown — swaying (512 segments)\nAxiom: F\nF → FF-[-F+F+F]+[+F-F-F]\nangle: 22° · + right · − left · [ ] branch","images":"attached"}
thinking
Select still shows 3, didn't change. The click on option didn't register via headless. Use keyboard: click select then key ArrowDown twice and Enter.
{"action":"click","x":132,"y":72}Frame 1, +0ms
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{"console":["warning: An iframe which has both allow-scripts and allow-same-origin for its sandbox attribute can escape its sandboxing."],"dom":"L-SYSTEM TREE\nGenerations:\n1\n2\n3\n4\n5\nRegrow\nGrown — swaying (512 segments)\nAxiom: F\nF → FF-[-F+F+F]+[+F-F-F]\nangle: 22° · + right · − left · [ ] branch","images":"attached"}
{"action":"key","text":"ArrowDown"}Frame 1, +0ms
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{"console":["warning: An iframe which has both allow-scripts and allow-same-origin for its sandbox attribute can escape its sandboxing."],"dom":"L-SYSTEM TREE\nGenerations:\n1\n2\n3\n4\n5\nRegrow\nGrown — swaying (512 segments)\nAxiom: F\nF → FF-[-F+F+F]+[+F-F-F]\nangle: 22° · + right · − left · [ ] branch","images":"attached"}
{"action":"key","text":"ArrowDown"}Frame 1, +0ms
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{"console":["warning: An iframe which has both allow-scripts and allow-same-origin for its sandbox attribute can escape its sandboxing."],"dom":"L-SYSTEM TREE\nGenerations:\n1\n2\n3\n4\n5\nRegrow\nGrown — swaying (512 segments)\nAxiom: F\nF → FF-[-F+F+F]+[+F-F-F]\nangle: 22° · + right · − left · [ ] branch","images":"attached"}
{"action":"key","text":"Enter"}Frame 1, +0ms
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{"console":["warning: An iframe which has both allow-scripts and allow-same-origin for its sandbox attribute can escape its sandboxing."],"dom":"L-SYSTEM TREE\nGenerations:\n1\n2\n3\n4\n5\nRegrow\nGrowing… (4096 segments)\nAxiom: F\nF → FF-[-F+F+F]+[+F-F-F]\nangle: 22° · + right · − left · [ ] branch","images":"attached"}
{"action":"motion"}Frame 1, +0ms
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{"console":["warning: An iframe which has both allow-scripts and allow-same-origin for its sandbox attribute can escape its sandboxing."],"dom":"L-SYSTEM TREE\nGenerations:\n1\n2\n3\n4\n5\nRegrow\nGrown — swaying (4096 segments)\nAxiom: F\nF → FF-[-F+F+F]+[+F-F-F]\nangle: 22° · + right · − left · [ ] branch","images":"attached"}
thinking
Gen 5 tree is 4096 segments and slightly overflows top at 800px height (top cut off). Reduce baseLen scaling so gen 5 fits. Height overflow by ~100px. Scale len by height: baseLen factor reduce. Currently baseLen for n=5: 320/2.2^4=13.7 → 13 (cap). Change cap formula: use max(4, min(13, 250/2.2^(n-1)))? For n=5: 250/23.4=10.7 → height scales by ~0.82, ~660px tall — fits. n=4: 250/10.6=23.6→13 same. n=3: 250/4.84=51→13. Good, only gen5 shrinks. But gen4 tree looked ~420px; gen5 with 0.82 factor → previous height ~ 900*0.82≈740 fits. Also lower y start? Base at height-30. Change 320→240.
Gen 5 slightly overflows the top. Shrinking the segment length for large generations:
{"edits":[{"newText":" const baseLen = Math.min(13, Math.max(3.5, 240 / Math.pow(2.2, n - 1)));","oldText":" const baseLen = Math.min(13, Successfully replaced 1 block(s) in index.html.
{"action":"reload"}Frame 1, +0ms
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{"console":["warning: An iframe which has both allow-scripts and allow-same-origin for its sandbox attribute can escape its sandboxing."],"dom":"L-SYSTEM TREE\nGenerations:\n1\n2\n3\n4\n5\nRegrow\nGrowing… (512 segments)\nAxiom: F\nF → FF-[-F+F+F]+[+F-F-F]\nangle: 22° · + right · − left · [ ] branch","images":"attached"}
thinking
Reload reset to gen 3 (default). Set to 5 and verify fit. Click select, ArrowDown, Enter again.
{"action":"click","x":132,"y":72}Frame 1, +0ms
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{"console":["warning: An iframe which has both allow-scripts and allow-same-origin for its sandbox attribute can escape its sandboxing."],"dom":"L-SYSTEM TREE\nGenerations:\n1\n2\n3\n4\n5\nRegrow\nGrown — swaying (512 segments)\nAxiom: F\nF → FF-[-F+F+F]+[+F-F-F]\nangle: 22° · + right · − left · [ ] branch","images":"attached"}
{"action":"key","text":"ArrowDown"}Frame 1, +0ms
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{"console":["warning: An iframe which has both allow-scripts and allow-same-origin for its sandbox attribute can escape its sandboxing."],"dom":"L-SYSTEM TREE\nGenerations:\n1\n2\n3\n4\n5\nRegrow\nGrown — swaying (512 segments)\nAxiom: F\nF → FF-[-F+F+F]+[+F-F-F]\nangle: 22° · + right · − left · [ ] branch","images":"attached"}
{"action":"key","text":"ArrowDown"}Frame 1, +0ms
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{"console":["warning: An iframe which has both allow-scripts and allow-same-origin for its sandbox attribute can escape its sandboxing."],"dom":"L-SYSTEM TREE\nGenerations:\n1\n2\n3\n4\n5\nRegrow\nGrown — swaying (512 segments)\nAxiom: F\nF → FF-[-F+F+F]+[+F-F-F]\nangle: 22° · + right · − left · [ ] branch","images":"attached"}
{"action":"key","text":"Enter"}Frame 1, +0ms
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{"console":["warning: An iframe which has both allow-scripts and allow-same-origin for its sandbox attribute can escape its sandboxing."],"dom":"L-SYSTEM TREE\nGenerations:\n1\n2\n3\n4\n5\nRegrow\nGrowing… (4096 segments)\nAxiom: F\nF → FF-[-F+F+F]+[+F-F-F]\nangle: 22° · + right · − left · [ ] branch","images":"attached"}
{"action":"motion"}Frame 1, +0ms
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{"console":["warning: An iframe which has both allow-scripts and allow-same-origin for its sandbox attribute can escape its sandboxing."],"dom":"L-SYSTEM TREE\nGenerations:\n1\n2\n3\n4\n5\nRegrow\nGrown — swaying (4096 segments)\nAxiom: F\nF → FF-[-F+F+F]+[+F-F-F]\nangle: 22° · + right · − left · [ ] branch","images":"attached"}
thinking
Gen 5 fits fully now (top ~155px, base ~770px). Swaying visible between frames; parent-child connections continuous. Done. Quick gen 1 check optional — regrow button tested implicitly? Not tested. Test Regrow button click while at gen 5? Regrow restarts growth — verified status changes? Skip; behavior identical to build. I'll do a quick gen1 check via select... that's more keys. It's fine — gen1 has fewer segments, baseLen capped at 13, small tree fits. I'm reasonably confident. Report.
Gen 5 now fits fully within the viewport. All behaviors verified. **`index.html`** — a self-contained animated L-system tree on p5.js: - **Grammar**: Axiom `F`, production `F → FF-[-F+F+F]+[+F-F-F]`, angle 22°, with `[ ]` push/pop branches. Expansion is bounded (`MAXLEN` cap on string length) and segment length shrinks per generation so the tree fits the viewport at every generation. - **Growth**: the parsed string becomes an ordered segment list; a fractional growth counter reveals segments tip-ward over ~2.6 s. Branches attach to the parent's current tip each frame, so parent-child connections stay continuous (visible in screenshots — no detached segments). - **Wind**: once grown, each segment gets a per-index sinusoidal angle offset scaled by branch depth; sway confirmed by comparing motion frames. - **Controls**: generation dropdown (1–5) and Regrow button; either restarts growth from the trunk with the chosen grammar. Status readout shows segment count and growth state. Verified in-browser: growth animation, connected branching at gens 3 and 5 (4096 segments), full-tree visibility at gen 5 (an initial overflow at the top was fixed by shrinking segment length), generation change restarting growth with a denser structure, and wind sway after completion. Not explicitly exercised: the Regrow button click (same code path as generation change) and gen 1/2 visuals.