L-system tree · qwen3.5-35b-a3b

Output generated Cost / run $0.0077 Runtime 103.7s

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.

⛨ sandboxed Open in new tab ↗

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

modelqwen3.5-35b-a3b

vendorQwen

harnesspi 0.87.1 · browser iteration

generated2026-10-16

METRICS

runtime103.7s

tokens in42k

tokens out7.1k

cached12k

cost / run$0.0077

Transcript · 19 messages

system

user

assistant

thinking

The user wants me to build an animated L-system tree using the provided p5.js library. Let me first check what's in the current directory and then create the index.html file.

Key requirements:
1. Define an axiom, production rules, and angle for a branching L-system
2. Show progressive growth from trunk to branch tips
3. Show tree swaying in wind after growth
4. Generation control from 1 to 5 with Regrow button
5. Keep the tree visible at every supported generation
6. Use procedural graphics (no external assets)

Let me first check the current directory to see the p5.min.js file.

→ bash {"command":"ls -la /tmp/job-9oCp4i"}

toolResult

total 1024 drwx------ 3 node node 4096 Oct 16 01:22 . drwxrwxrwt 6 root root 4096 Oct 16 01:22 .. drwxr-xr-x 3 node node 4096 Oct 16 01:22 .home -rw-r--r-- 1 node node 1034532 Oct 16 01:22 p5.min.js

assistant

thinking

Good, I can see p5.min.js is available. Now I'll create the index.html file with a complete L-system tree implementation.

I'll create an L-system with:
- Axiom: "F"
- Production rules: "F" -> "FF+[+F-F-F]-[-F+F+F]" (a classic fractal tree)
- Angle: 25 degrees

The implementation will:
1. Expand the L-system string based on the generation
2. Draw the tree progressively with animation
3. Show wind sway after growth completes
4. Provide generation control and Regrow functionality

Let me write the complete solution.

→ write /tmp/job-9oCp4i/index.html (10860 bytes)

toolResult

Successfully wrote to /tmp/job-9oCp4i/index.html

assistant

thinking

Let me now run the application in the browser to verify the behavior. I'll open it and check the output.

→ bash {"command":"cd /tmp/job-9oCp4i && python3 -m http.server 8080 &"}

toolResult

/bin/bash: line 1: python3: command not found

assistant

thinking

Python3 is not available. Let me try with python if available.

→ bash {"command":"which python"}

toolResult

(no output) Command exited with code 1

assistant

thinking

Neither python nor python3 is available. Let me use the browser tool to inspect the HTML file directly.

→ bash {"command":"ls -la /usr/bin/python* 2>/dev/null || echo \"No python found\""}

toolResult

No python found

assistant

thinking

Let me just use the browser tool to load and inspect the HTML file directly.

→ bash {"command":"file /tmp/job-9oCp4i/index.html"}

toolResult

/bin/bash: line 1: file: command not found Command exited with code 127

assistant

thinking

Let me just use the browser tool to load and inspect the HTML file.

→ bash {"command":"cat /tmp/job-9oCp4i/index.html | head -50"}

toolResult

<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>L-System Tree</title> <style> body { margin: 0; padding: 0; background: #1a1a2e; font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; display: flex; flex-direction: column; align-items: center; min-height: 100vh; color: #fff; } h1 { margin: 10px 0; font-size: 24px; color: #4ade80; } .controls { margin: 10px 0; display: flex; gap: 15px; align-items: center; flex-wrap: wrap; justify-content: center; } .control-group { display: flex; align-items: center; gap: 8px; } label { font-size: 14px; color: #a5b4fc; } select, button { padding: 8px 16px; border: none; border-radius: 4px; font-size: 14px; cursor: pointer; transition: all 0.2s; } select { background: #334155;

assistant

thinking

Good, the file is there. Now let me use the browser tool to load the HTML file and inspect what happens.

→ browser {"action":"screenshot"}

toolResult

Frame 1, +0ms

[Browser image supplied to model]

{"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 alpha() 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: Identifier 'alpha' has already been declared"],"dom":"🌳 L-System Tree\nGeneration:\n1\n2\n3\n4\n5\nRegrow\nWatch the tree grow and sway in the wind!","images":"attached"}

assistant

thinking

The previous implementation has issues with the p5.js alpha() function warning. I need to rewrite the index.html with a proper L-system implementation that:
1. Defines proper axiom, production rules, and angle
2. Expands the grammar and interprets it to draw a connected tree
3. Shows progressive growth with wind swaying
4. Has generation control (1-5) and Regrow button
5. Keeps tree visible at all generations
6. Uses procedural graphics with proper styling

Let me create a complete working implementation.

The previous implementation has issues. Let me create a proper L-system tree with all required functionality. <tool_call> write <file_content> <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>L-System Tree</title> <style> body { margin: 0; padding: 0; background: #1a1a2e; font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; display: flex; flex-direction: column; align-items: center; min-height: 100vh; color: #fff; } h1 { margin: 10px 0; font-size: 24px; color: #4ade80; } .controls { margin: 10px 0; display: flex; gap: 15px; align-items: center; flex-wrap: wrap; justify-content: center; } .control-group { display: flex; align-items: center; gap: 8px; } label { font-size: 14px; color: #a5b4fc; } select, button { padding: 8px 16px; border: none; border-radius: 4px; font-size: 14px; cursor: pointer; transition: all 0.2s; } select { background: #334155; color: #fff; border: 1px solid #475569; } select:hover, button:hover { transform: translateY(-2px); box-shadow: 0 4px 12px rgba(0,0,0,0.3); } select:focus, button:focus { outline: none; border-color: #4ade80; } button { background: #4ade80; color: #0f172a; font-weight: bold; } #canvas-container { margin: 10px; border-radius: 8px; overflow: hidden; box-shadow: 0 8px 32px rgba(0,0,0,0.3); } .info { font-size: 12px; color: #64748b; margin-top: 5px; } </style> </head> <body> <h1>🌳 L-System Tree</h1> <div class="controls"> <div class="control-group"> <label for="generation">Generation:</label> <select id="generation" disabled> <option value="1">1</option> <option value="2">2</option> <option value="3">3</option> <option value="4" selected>4</option> <option value="5">5</option> </select> </div> <button id="regrow">Regrow</button> </div> <div class="info">Select a generation and click Regrow to see the tree grow!</div> <div id="canvas-container"></div> <script src="p5.min.js"></script> <script> const grammar = { axiom: "F", rules: [ ["F", "F[[+F]F][[-F]F]"], ["F", "F[+F][-F]F"], ["F", "FF"], ["F", "F+F-F-F+F"], ["F", "F[[+F][-F]]F"] ], angle: Math.PI / 4 // 45 degrees }; class Branch { constructor(length, thickness, depth, maxDepth) { this.length = length; this.thickness = thickness; this.maxDepth = maxDepth; this.depth = depth; this.angle = 0; this.angleVariance = 0.3; this.finished = false; this.growProgress = 0; this.currentLength = 0; this.parent = null; } grow() { if (this.finished) return 0; const growthSpeed = 0.02 + (this.depth * 0.01); this.growProgress += growthSpeed; if (this.growProgress >= 1) { this.growProgress = 1; this.finished = true; this.currentLength = this.length; return this.length; } this.currentLength = this.length * this.growProgress; return this.currentLength; } draw() { const progress = Math.min(1, this.currentLength / this.length); const hue = 25 + (this.depth * 10); const sat = 60; const light = Math.max(30, 60 - this.depth * 5); stroke(hue, sat, light); strokeWeight(this.thickness); line(0, 0, 0, this.currentLength); } getEnd() { return createVector(0, this.currentLength); } } class LSystemTree { constructor() { this.maxDepth = 5; this.angle = Math.PI / 4; this.history = []; this.initialAngle = 0; this.generation = 4; this.growing = true; this.allGrown = false; this.growTime = 0; this.swayOffset = 0; this.swaySpeed = 0.02; this.initializeRandom(); } initializeRandom() { const r = Math.floor(Math.random() * 5); this.grammar = { axiom: "F", rules: [ ["F", "F[[+F]F][[-F]F]"], ["F", "F[+F][-F]F"], ["F", "FF"], ["F", "F+F-F-F+F"], ["F", "F[[+F][-F]]F"] ], angle: [Math.PI / 3, Math.PI / 4, Math.PI / 3, Math.PI / 5, Math.PI / 4][r] }; this.grammar.index = r; this.initialAngle = -Math.PI / 2 + (Math.random() - 0.5) * 0.5; } setGeneration(generation) { this.generation = generation; this.history = []; this.currentString = grammar.axiom; this.expandGrammar(); this.calculateTotalLength(); this.growing = true; this.allGrown = false; this.growTime = 0; this.swayOffset = 0; if (this.generation <= 2) { this.angle = Math.PI / 3; } else if (this.generation <= 4) { this.angle = Math.PI / 4; } else { this.angle = Math.PI / 5; } } expandGrammar() { this.currentString = grammar.grammar.axiom; for (let gen = 1; gen < this.generation; gen++) { let newString = ""; for (let i = 0; i < this.currentString.length; i++) { let c = this.currentString[i]; if (c === "F") { const rules = grammar.grammar.rules; const rule = rules[grammar.grammar.index]; newString += rule[1]; } else { newString += c; } } this.currentString = newString; } } calculateTotalLength() { let total = 0; let depth = 0; for (let i = 0; i < this.currentString.length; i++) { let c = this.currentString[i]; if (c === "F") { total += Math.pow(0.7, depth); } else if (c === "[") { depth++; } else if (c === "]") { depth = Math.max(0, depth - 1); } } this.totalLength = total; } setLength() { return Math.min(120, 800 / (Math.pow(1.5, this.generation))); } update() { if (this.growing) { this.growTime++; let currentLen = 0; let depth = 0; let maxBranchLen = this.setLength(); for (let i = 0; i < this.currentString.length; i++) { let c = this.currentString[i]; if (c === "F") { currentLen += maxBranchLen * Math.pow(0.7, depth); const target = currentLen; const progress = Math.min(1, this.growTime / (200 + gen * 50)); if (progress >= 1) { depth++; } } else if (c === "[") { depth++; } else if (c === "]") { depth = Math.max(0, depth - 1); } } this.swayOffset += this.swaySpeed; this.growing = this.growTime < 300 + this.generation * 50; this.allGrown = !this.growing; } } drawTree() { if (this.currentString.length === 0) return; let maxBranchLen = this.setLength(); let branch = new Branch(maxBranchLen, 4, 0, this.maxDepth); let stack = []; let currentDepth = 0; let currentAngle = this.initialAngle; let position = createVector(0, 0); let totalDrawn = 0; noFill(); for (let i = 0; i < this.currentString.length; i++) { let c = this.currentString[i]; let drawLen = 0; if (c === "F") { currentDepth++; drawLen = maxBranchLen * Math.pow(0.7, currentDepth - 1); const progress = Math.min(1, this.growTime / (250 + currentDepth * 50)); if (progress >= 1 || !this.growing) { drawLen = maxBranchLen * Math.pow(0.7, currentDepth - 1); } else { drawLen = maxBranchLen * Math.pow(0.7, currentDepth - 1) * progress; } let sway = Math.sin(this.swayOffset + currentDepth * 0.3) * 0.1 * currentDepth; push(); translate(position.x, position.y); rotate(currentAngle + sway); let hue = 25 + (currentDepth % 5) * 10; let sat = 50 + (currentDepth % 3) * 10; let light = Math.max(30, 60 - currentDepth * 5); stroke(hue, sat, light); strokeWeight(Math.max(0.5, 4 - currentDepth * 0.7)); line(0, 0, 0, -drawLen); pop(); currentAngle += sway; position.y -= drawLen; totalDrawn += drawLen; } else if (c === "F" && i > 0 && this.currentString[i-1] !== "]") { totalDrawn += maxBranchLen; } else if (c === "[") { stack.push({position: createVector(position.x, position.y), angle: currentAngle, depth: currentDepth}); } else if (c === "]") { if (stack.length > 0) { let saved = stack.pop(); position = createVector(saved.position.x, saved.position.y); currentAngle = saved.angle; currentDepth = saved.depth; } } } this.drawLeaves(totalDrawn); } drawLeaves(totalDrawn) { if (!this.allGrown) return; let maxBranchLen = this.setLength(); let drawLen = 0; let depth = 0; let positions = []; for (let i = 0; i < this.currentString.length; i++) { let c = this.currentString[i]; if (c === "F") { drawLen += maxBranchLen * Math.pow(0.7, depth); if (depth >= 3 && Math.random() < 0.3) { positions.push(createVector(0, -drawLen)); } depth++; } else if (c === "[") { depth++; } else if (c === "]") { depth = Math.max(0, depth - 1); } } let leafHues = [35, 120, 40, 60]; for (let pos of positions) { let leafHue = leafHues[Math.floor(Math.random() * leafHues.length)]; fill(leafHue, 70, 60); noStroke(); let sway = Math.sin(this.swayOffset) * 2; push(); translate(pos.x + sway, pos.y); ellipse(0, 0, 8, 6); pop(); } } draw() { this.update(); this.drawTree(); } } let tree; function setup() { let canvas = createCanvas(400, 500); canvas.parent("canvas-container"); tree = new LSystemTree(); tree.setGeneration(4); document.getElementById("generation").disabled = false; document.getElementById("generation").addEventListener("change", function() { let gen = parseInt(this.value); tree.setGeneration(gen); }); document.getElementById("regrow").addEventListener("click", function() { let gen = parseInt(document.getElementById("generation").value); tree.setGeneration(gen); }); } function draw() { clear(); tree.draw(); } </script> </body> </html> </file_content> <filePath>/tmp/job-9oCp4i/index.html</filePath> </write>