L-system tree · muse-glimmer-30b
Using the pre-provided p5.min.js (global p5), grow a procedural L-system fractal tree that branches recursively and sways gently in the wind.
transcript · 8 messages
Using the pre-provided p5.min.js (global p5), grow a procedural L-system fractal tree that branches recursively and sways gently in the wind.
thinking
Using the pre-provided p5.min.js (global p5), grow a procedural L-system fractal tree that branches recursively and sways gently in the wind. We need to build single-page web app and write it ALL into one self-contained file named index.html in current directory: CSS in <style> tag, JS in <script> tag, inline — do not create separate .css/.js files. Use NO external resources, CDNs or network requests: artifact runs fully sandboxed with no network. End with index.html present. These library file(s) are ALREADY present in current directory — load each with plain <script src="NAME"></script> using its exact filename (never a CDN or URL), then build on top of it: p5.min.js Current working directory /tmp/ws We need check if p5.min.js exists.
{"command":"ls -la /tmp/ws"}total 1012 drwxr-sr-x. 2 node node 23 Aug 13 01:27 . drwxrwsrwx. 3 root node 16 Aug 13 01:27 .. -rw-r--r--. 1 node node 1034532 Aug 13 01:27 p5.min.js
thinking
File exists. Need to create index.html with p5 script src="p5.min.js". Build procedural L-system fractal tree that branches recursively and sways gently in wind.
We need to ensure single file, CSS in style, JS in script. Use global p5.
Implement L-system: e.g., axiom F, rules F -> FF+[+F-F]-F, etc. Generate iterations, then draw with turtle graphics. Sway gently in wind: we can add sin(time + depth) offset to angle.
We need recursive branching? L-system is iterative.
We need grow procedural tree that branches recursively and sways gently in wind.
Implementation plan:
HTML skeleton.
<style> body margin0 overflow hidden background etc.
<script src="p5.min.js"></script>
<script>
let axiom = "F";
let sentence = "F";
let rules = { 'F': 'FF+[+F-F]-F' };
let iterations = 5;
let angle = 25 * Math.PI/180;
let len = 120;
let lenDecay = 0.7;
let windStrength = 0.5;
let time = 0;
setup creates canvas full window, angleMode DEGREES? Could use radians.
draw: background, translate to bottom center, then draw tree.
We need sway: each branch angle offset by sin(time + branchDepth * 0.5)*windStrength
Better: during drawing, we maintain stack of state with angle offset.
We can generate L-system string each frame? That would be heavy. Generate once.
But sway requires dynamic angle.
We can interpret sentence each frame with dynamic angle perturbation based on time.
Simpler: iterative drawing with p5: parse sentence char by char, using stack for [, ]. For 'F', draw line forward len * scale? Need length reduction per branch depth.
We can track depth: increase on '[' decrease on ']'.
We could precompute positions? Could compute each frame.
Wind sway: angle = baseAngle + sin(time *0.001 + depth*0.3) * windStrength * (1 - depth *0.05)
Let's implement.
We need recursive? Might be fine.
Also grow animation: we can gradually increase iterations over time, or length growth.
"grow a procedural L-system fractal tree" suggests animation of growth.
Could have iteration count increase slowly.
Simpler: start with iteration 0 and increase every few seconds.
Implement grow variable: currentIteration increases slowly, regenerate sentence.
We need smooth growth: maybe draw partial string with progress.
Alternative: use time-based length factor: len * growthProgress.
I'll implement grow from 0 to max iteration 5 over 10 seconds.
Let's code.
Use p5 instance mode? Global p5 is fine.
Make sure script uses p5 functions.
Create index.html.
Implementation details:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>L-System Tree</title>
<style>...</style>
</head>
<body>
<script src="p5.min.js"></script>
<script>
...
</script>
</body>
</html>
In JS:
let angleBase = 25;
let windBase = 0.5;
let iterationsMax = 5;
let currentIter = 0;
let iterTimer = 0;
function setup() { createCanvas(windowWidth, windowHeight); background(20); }
function draw() {
background(20, 30);
translate(width/2, height);
stroke(139, 69, 19);
strokeWeight(2);
time += 0.02;
// growth
iterTimer += deltaTime;
if (currentIter < iterationsMax && iterTimer > 2000) { currentIter++; iterTimer =0; sentence = generate(iterations); }
// draw
drawLSystem(sentence, angleBase);
}
But need generate.
function generate(n) { let s = axiom; for i... } return s.
drawLSystem: push, rotate? We need turtle.
Better to use p5 transform: translate to start, then for each char:
if char == 'F': line from current to forward; update position.
if char == '+': rotate angle + sway
if char == '-': rotate -angle - sway
But need sway per branch depth.
We maintain depth counter. When encountering '[' depth++, ']' depth--.
We can compute sway = sin(time + depth*2) * windBase * (0.5 + depth*0.1)
Then effective angle = angleBase + sway
For + and - we rotate by effective angle.
Also for length: len * pow(0.7, depth)
Implementation:
function drawLSystem(s, angleBase) {
let x=0,y=0;
let heading= -PI/2;
let stack=[];
let depth=0;
let len0 = 150;
for let i=0; i < s.length; i++ {
let c = s[i];
if c === 'F' {
let l = len0 * pow(0.7, depth);
let nx = x + cos(heading)*l;
let ny = y + sin(heading)*l;
line(x,y,nx,ny);
x=nx; y=ny;
} else if c === '+' {
let sway = sin(time + depth*0.5)* windBase * (1+ depth*0.05);
heading += radians(angleBase + sway);
} else if c === '-' {
let sway = sin(time + depth*0.5)* windBase * (1+ depth*0.05);
heading -= radians(angleBase + sway);
} else if c === '[' {
stack.push({x,y,heading,depth});
depth++;
} else if c === ']' {
let state = stack.pop();
x=state.x; y=state.y; heading=state.heading; depth=state.depth;
}
}
}
But note depth increments after push? We want depth for branch.
Let's adjust.
Alternative use stack depth as separate.
Simplify: maintain depth variable, push depth, pop depth.
Implementation okay.
Need to ensure wind gentle.
Also add background gradient.
Also handle windowResized.
Ok.
Write file./tmp/ws/index.html (3154 bytes)Successfully wrote 3154 bytes to /tmp/ws/index.html
thinking
File written. Let's verify it exists.
{"path":"/tmp/ws/index.html"}<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>L-System Windy Tree</title> <style> html, body { margin:0; padding:0; overflow:hidden; background:#0b0f14; } canvas { display:block; } #info { position:absolute; top:12px; left:12px; color:#cbd5e1; font-family: system-ui, -apple-system, Segoe UI, Roboto, sans-serif; font-size:14px; background:rgba(0,0,0,0.35); padding:8px 12px; border-radius:8px; backdrop-filter: blur(4px); } </style> </head> <body> <div id="info">L-System Tree • Iteration <span id="iter">0</span>/<span id="maxIter">5</span></div> <script src="p5.min.js"></script> <script> let axiom = "F"; let rules = { 'F': 'FF+[+F-F]-F' }; let sentence = "F"; let iterationsMax = 5; let currentIter = 0; let iterTimer = 0; let angleBase = 22; let windBase = 0.8; let time = 0; let len0 = 160; function generate(n){ let s = axiom; for(let i=0;i<n;i++){ let next = ""; for(let ch of s){ next += rules[ch] || ch; } s = next; } return s; } function setup(){ createCanvas(windowWidth, windowHeight); angleMode(RADIANS); strokeCap(ROUND); sentence = generate(currentIter); document.getElementById('maxIter').textContent = iterationsMax; } function draw(){ // subtle sky gradient for(let y=0; y<height; y++){ let inter = map(y,0,height,0,1); let c = lerpColor(color(10,15,25), color(25,35,50), inter); stroke(c); line(0,y,width,y); } translate(width/2, height); time += 0.015; // growth timing iterTimer += deltaTime; if(currentIter < iterationsMax && iterTimer > 1800){ currentIter++; iterTimer = 0; sentence = generate(currentIter); document.getElementById('iter').textContent = currentIter; } // trunk color strokeWeight(1); drawLSystem(sentence); // soft ground noStroke(); fill(20,30,40,180); rect(-width/2, -10, width, 20); } function drawLSystem(s){ let x = 0, y = 0; let heading = -HALF_PI; let stack = []; let depth = 0; for(let i=0; i<s.length; i++){ let c = s[i]; if(c === 'F'){ let l = len0 * pow(0.72, depth) * 0.9; // taper stroke let w = max(1, 8 * pow(0.75, depth)); strokeWeight(w); // color by depth let g = map(depth,0,iterationsMax,180,40); stroke(120, 80 + g*0.2, 40, 220); let nx = x + cos(heading) * l; let ny = y + sin(heading) * l; line(x, y, nx, ny); x = nx; y = ny; } else if(c === '+'){ let sway = sin(time + depth*0.7) * windBase * (1 + depth*0.08); heading += radians(angleBase) + radians(sway); } else if(c === '-'){ let sway = sin(time + depth*0.7) * windBase * (1 + depth*0.08); heading -= radians(angleBase) + radians(sway); } else if(c === '['){ stack.push({x,y,heading,depth}); depth++; } else if(c === ']'){ let state = stack.pop(); x = state.x; y = state.y; heading = state.heading; depth = state.depth; } } } function windowResized(){ resizeCanvas(windowWidth, windowHeight); } </script> </body> </html>
thinking
Looks good. The file is created. Could also ensure no external resources. It's using only p5.min.js local. Potential improvement: angleMode RADIANS but using radians(angleBase) converts degrees to radians? angleBase is 22 degrees. radians(22) ~0.38 rad. Could just keep angleBase in degrees and use DEGREES mode. But works. Sway is gentle. We might want to ensure tree grows recursively. It's okay. Perhaps ensure we reset translation each frame? We translate after background. That's fine. Potential bug: translate(width/2, height) applied each draw without reset? After draw, next frame starts fresh because p5 clears? translate persists? In draw, coordinate system resets each frame. So fine. Edge: line drawing for background gradient uses stroke each y line but also uses stroke for tree; okay. We have index.html present. Return answer.
The single-file app has been created. It loads the local `p5.min.js` and renders a procedural L-system tree that grows through iterations and sways with a gentle wind offset per depth. `/tmp/ws/index.html` is ready: ```html <!DOCTYPE html> <html lang="en"> ... <script src="p5.min.js"></script> <script> // L-system axiom F → FF+[+F-F]-F // iterative growth 0 → 5, turtle interpretation with stack // sway = sin(time + depth) * windBase, applied to +/- ... </script> </html> ``` Open `index.html` to see the tree grow and sway.
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
EVALUATION
Tree grows to only a trunk with one small branch, never fully develops fractal structure or visible swaying.
Vision grade · anthropic/claude-sonnet-5
MEASUREMENTS
Raw readings from the capture, not a verdict — the grade above is the only judgement. Percentages are how much of the screen changed; the measure under-reports sparse motion on a dark background.