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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Paper Physics Simulator</title>
<!-- Import FontAwesome for Icons -->
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.4.0/css/all.min.css">
<!-- Import Matter.js for Physics -->
<script src="https://cdnjs.cloudflare.com/ajax/libs/matter-js/0.19.0/matter.min.js"></script>
<style>
:root {
--bg-color: #121214;
--panel-bg: rgba(32, 33, 36, 0.7);
--accent-color: #8257e6;
--accent-hover: #9466ff;
--text-main: #e1e1e6;
--text-muted: #a8a8b3;
--border-color: rgba(255, 255, 255, 0.1);
--font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
}
* {
box-sizing: border-box;
margin: 0;
padding: 0;
-webkit-font-smoothing: antialiased;
}
body {
font-family: var(--font-family);
background-color: var(--bg-color);
color: var(--text-main);
overflow: hidden; /* Prevent scroll on the main page */
height: 100vh;
width: 100vw;
display: flex;
flex-direction: column;
}
/* --- Header --- */
header {
height: 60px;
display: flex;
align-items: center;
justify-content: space-between;
padding: 0 24px;
background: rgba(18, 18, 20, 0.9);
border-bottom: 1px solid var(--border-color);
z-index: 10;
backdrop-filter: blur(10px);
}
.logo {
font-weight: 700;
font-size: 1.2rem;
display: flex;
align-items: center;
gap: 10px;
}
.logo i {
color: var(--accent-color);
}
.built-with {
font-size: 0.85rem;
color: var(--text-muted);
text-decoration: none;
transition: color 0.3s;
}
.built-with:hover {
color: var(--accent-color);
}
/* --- Main Layout --- */
main {
flex: 1;
position: relative;
display: flex;
height: calc(100vh - 60px);
}
/* --- Canvas Container --- */
#canvas-container {
flex: 1;
position: relative;
background: radial-gradient(circle at center, #1e1e24 0%, #121214 100%);
cursor: crosshair;
overflow: hidden;
}
canvas {
display: block;
width: 100%;
height: 100%;
}
/* --- Controls Sidebar --- */
aside {
width: 320px;
background: var(--panel-bg);
border-left: 1px solid var(--border-color);
backdrop-filter: blur(20px);
display: flex;
flex-direction: column;
overflow-y: auto;
padding: 20px;
gap: 24px;
transition: transform 0.3s ease;
}
.control-group {
display: flex;
flex-direction: column;
gap: 12px;
}
.group-header {
display: flex;
justify-content: space-between;
align-items: center;
font-size: 0.9rem;
font-weight: 600;
color: var(--text-muted);
text-transform: uppercase;
letter-spacing: 0.5px;
border-bottom: 1px solid var(--border-color);
padding-bottom: 8px;
}
/* --- UI Elements --- */
label {
font-size: 0.85rem;
display: flex;
justify-content: space-between;
}
.value-display {
color: var(--accent-color);
font-family: monospace;
}
input[type="range"] {
-webkit-appearance: none;
width: 100%;
height: 6px;
background: rgba(255,255,255,0.1);
border-radius: 3px;
outline: none;
}
input[type="range"]::-webkit-slider-thumb {
-webkit-appearance: none;
width: 16px;
height: 16px;
border-radius: 50%;
background: var(--accent-color);
cursor: pointer;
transition: background 0.2s;
}
input[type="range"]::-webkit-slider-thumb:hover {
background: var(--accent-hover);
}
.btn {
background: var(--accent-color);
color: white;
border: none;
padding: 12px;
border-radius: 8px;
font-weight: 600;
cursor: pointer;
transition: all 0.2s;
display: flex;
align-items: center;
justify-content: center;
gap: 8px;
}
.btn:hover {
background: var(--accent-hover);
transform: translateY(-1px);
}
.btn:active {
transform: translateY(1px);
}
.btn-outline {
background: transparent;
border: 1px solid var(--border-color);
color: var(--text-main);
}
.btn-outline:hover {
border-color: var(--accent-color);
color: var(--accent-color);
}
.btn-danger {
background: rgba(220, 38, 38, 0.2);
color: #ff6b6b;
border: 1px solid rgba(220, 38, 38, 0.3);
}
.btn-danger:hover {
background: rgba(220, 38, 38, 0.4);
color: #fff;
}
/* --- Toggle Switch --- */
.toggle-row {
display: flex;
justify-content: space-between;
align-items: center;
font-size: 0.9rem;
}
.switch {
position: relative;
display: inline-block;
width: 40px;
height: 20px;
}
.switch input {
opacity: 0;
width: 0;
height: 0;
}
.slider {
position: absolute;
cursor: pointer;
top: 0;
left: 0;
right: 0;
bottom: 0;
background-color: rgba(255,255,255,0.1);
transition: .4s;
border-radius: 20px;
}
.slider:before {
position: absolute;
content: "";
height: 14px;
width: 14px;
left: 3px;
bottom: 3px;
background-color: white;
transition: .4s;
border-radius: 50%;
}
input:checked + .slider {
background-color: var(--accent-color);
}
input:checked + .slider:before {
transform: translateX(20px);
}
/* --- Instructions Overlay --- */
.instructions {
position: absolute;
bottom: 20px;
left: 50%;
transform: translateX(-50%);
background: rgba(0, 0, 0, 0.6);
padding: 8px 16px;
border-radius: 20px;
font-size: 0.85rem;
color: var(--text-muted);
pointer-events: none;
user-select: none;
backdrop-filter: blur(4px);
border: 1px solid var(--border-color);
}
/* --- Mobile Responsive --- */
@media (max-width: 768px) {
main {
flex-direction: column;
}
aside {
width: 100%;
height: 40%;
border-left: none;
border-top: 1px solid var(--border-color);
}
#canvas-container {
height: 60%;
}
}
</style>
</head>
<body>
<header>
<div class="logo">
<i class="fa-solid fa-layer-group"></i>
<span>PaperLab</span>
</div>
<a href="https://huggingface.co/spaces/akhaliq/anycoder" target="_blank" class="built-with">Built with anycoder</a>
</header>
<main>
<div id="canvas-container">
<canvas id="world"></canvas>
<div class="instructions">
<i class="fa-regular fa-hand-pointer"></i> Tap or Drag anywhere to tear paper
</div>
</div>
<aside>
<!-- Physics Controls -->
<div class="control-group">
<div class="group-header">
<span>Physics Engine</span>
<i class="fa-solid fa-atom"></i>
</div>
<div class="toggle-row">
<span>Gravity</span>
<label class="switch">
<input type="checkbox" id="gravity-toggle" checked>
<span class="slider"></span>
</label>
</div>
<div class="toggle-row">
<span>Wind Force</span>
<label class="switch">
<input type="checkbox" id="wind-toggle">
<span class="slider"></span>
</label>
</div>
</div>
<!-- Tear Settings -->
<div class="control-group">
<div class="group-header">
<span>Tear Settings</span>
<i class="fa-solid fa-scissors"></i>
</div>
<label>
Rip Amount (Complexity)
<span id="val-rip" class="value-display">3</span>
</label>
<input type="range" id="rip-amount" min="1" max="10" value="3" step="1">
<label>
Extra Pieces (Chaos)
<span id="val-pieces" class="value-display">0</span>
</label>
<input type="range" id="extra-pieces" min="0" max="5" value="0" step="1">
</div>
<!-- Material Properties -->
<div class="control-group">
<div class="group-header">
<span>Material</span>
<i class="fa-solid fa-cube"></i>
</div>
<label>
Roughness (Friction)
<span id="val-friction" class="value-display">0.5</span>
</label>
<input type="range" id="friction" min="0" max="1" value="0.5" step="0.05">
<label>
Restitution (Bounciness)
<span id="val-restitution" class="value-display">0.2</span>
</label>
<input type="range" id="restitution" min="0" max="1" value="0.2" step="0.05">
</div>
<!-- Speed Control -->
<div class="control-group">
<div class="group-header">
<span>Simulation Speed</span>
<i class="fa-solid fa-gauge-high"></i>
</div>
<label>
Time Scale
<span id="val-speed" class="value-display">1.0x</span>
</label>
<input type="range" id="time-scale" min="0.1" max="2.0" value="1.0" step="0.1">
</div>
<!-- Actions -->
<div class="control-group" style="margin-top: auto;">
<button id="btn-reset" class="btn btn-danger">
<i class="fa-solid fa-trash-can"></i> Reset Scene
</button>
<button id="btn-explode" class="btn btn-outline">
<i class="fa-solid fa-wind"></i> Explode
</button>
</div>
</aside>
</main>
<script>
// --- 1. Initialization ---
const canvas = document.getElementById('world');
const container = document.getElementById('canvas-container');
// Module Aliases
const Engine = Matter.Engine,
Render = Matter.Render,
Runner = Matter.Runner,
Bodies = Matter.Bodies,
Composite = Matter.Composite,
Events = Matter.Events,
Mouse = Matter.Mouse,
MouseConstraint = Matter.MouseConstraint,
Vector = Matter.Vector,
Body = Matter.Body;
// Create Engine
const engine = Engine.create();
const world = engine.world;
// Handle High DPI Screens
const dpr = window.devicePixelRatio || 1;
function resizeCanvas() {
const width = container.clientWidth;
const height = container.clientHeight;
canvas.width = width * dpr;
canvas.height = height * dpr;
canvas.style.width = `${width}px`;
canvas.style.height = `${height}px`;
const ctx = canvas.getContext('2d');
ctx.scale(dpr, dpr);
// Keep walls on resize
updateWalls(width, height);
}
// --- 2. Scene Setup ---
let paperBody = null;
let walls = [];
let particles = []; // For explosion effects
function createPaper(width, height) {
// Remove existing paper
if (paperBody) Composite.remove(world, paperBody);
const thickness = 10;
const halfW = width / 2;
const halfH = height / 2;
// Create a static rectangle for the main sheet
paperBody = Bodies.rectangle(halfW, halfH, width, thickness, {
isStatic: true,
chamfer: { radius: 5 }, // Rounded corners
render: { fillStyle: '#ffffff' },
friction: parseFloat(document.getElementById('friction').value),
restitution: parseFloat(document.getElementById('restitution').value),
label: 'paper'
});
Composite.add(world, paperBody);
}
function updateWalls(width, height) {
// Remove old walls
if (walls.length > 0) Composite.remove(world, walls);
const wallOptions = {
isStatic: true,
render: { visible: false } // Invisible walls
};
walls = [
Bodies.rectangle(width/2, -50, width, 100, wallOptions), // Top
Bodies.rectangle(width/2, height + 50, width, 100, wallOptions), // Bottom
Bodies.rectangle(width + 50, height/2, 100, height, wallOptions), // Right
Bodies.rectangle(-50, height/2, 100, height, wallOptions) // Left
];
Composite.add(world, walls);
}
// --- 3. Interaction (Tearing) ---
Events.on(engine, 'collisionStart', function(event) {
const pairs = event.pairs;
const ripAmount = parseInt(document.getElementById('rip-amount').value);
const extraPieces = parseInt(document.getElementById('extra-pieces').value);
// Check if any collision involves the paper
const paperCollisions = pairs.filter(pair =>
pair.bodyA.label === 'paper' || pair.bodyB.label === 'paper'
);
if (paperCollisions.length > 0) {
tearPaper(ripAmount, extraPieces);
}
});
function tearPaper(ripAmount, extraPieces) {
if (!paperBody) return;
// Get vertices
const vertices = paperBody.vertices;
const center = paperBody.position;
// Calculate area of the original paper
const area = Matter.Vertices.area(vertices);
// We want to cut out a chunk based on ripAmount
// Higher ripAmount = smaller chunk cut out
const chunkSize = area / (ripAmount + 1);
// Pick a random starting vertex
const startIndex = Math.floor(Math.random() * vertices.length);
const startVertex = vertices[startIndex];
// Find the next vertex
let nextIndex = (startIndex + 1) % vertices.length;
let nextVertex = vertices[nextIndex];
// Create a new polygon representing the "chunk" to remove
// We construct a polygon starting from startVertex, going around to nextVertex
// and adding a point slightly offset from the center to make it a chunk
const chunkVertices = [startVertex, nextVertex];
// Add a point in the middle of the paper
chunkVertices.push({ x: center.x, y: center.y });
// Create a new body from these vertices
const chunkBody = Bodies.fromVertices(center.x, center.y, [chunkVertices], {
isStatic: false,
density: 0.002,
friction: parseFloat(document.getElementById('friction').value),
restitution: parseFloat(document.getElementById('restitution').value),
chamfer: { radius: 2 }
});
if (chunkBody) {
// Add some random velocity to the chunk so it falls
Body.setVelocity(chunkBody, {
x: (Math.random() - 0.5) * 10,
y: (Math.random() - 0.5) * 10
});
// Add some extra random pieces if requested
for(let i=0; i<extraPieces; i++) {
const smallSize = 20 + Math.random() * 30;
const smallBody = Bodies.circle(
center.x + (Math.random()-0.5)*100,
center.y + (Math.random()-0.5)*100,
smallSize/2,
{
isStatic: false,
density: 0.005,
friction: parseFloat(document.getElementById('friction').value),
restitution: parseFloat(document.getElementById('restitution').value)
}
);
Body.setVelocity(smallBody, {
x: (Math.random() - 0.5) * 20,
y: (Math.random() - 0.5) * 20
});
Composite.add(world, smallBody);
}
Composite.add(world, chunkBody);
// Remove the original paper
Composite.remove(world, paperBody);
paperBody = null;
}
}
// --- 4. Rendering ---
// Custom renderer loop
function renderLoop() {
const width = container.clientWidth;
const height = container.clientHeight;
// Clear
const ctx = canvas.getContext('2d');
ctx.clearRect(0, 0, width, height);
// Draw Particles (Confetti)
particles.forEach((p, index) => {
p.x += p.vx;
p.y += p.vy;
p.life -= 0.02;
if (p.life <= 0) {
particles.splice(index, 1);
} else {
ctx.globalAlpha = p.life;
ctx.fillStyle = p.color;
ctx.beginPath();
ctx.arc(p.x, p.y, p.size, 0, Math.PI * 2);
ctx.fill();
}
});
ctx.globalAlpha = 1;
// Draw Bodies
const bodies = Composite.allBodies(world);
ctx.lineWidth = 1;
ctx.strokeStyle = 'rgba(255, 255, 255, 0.1)';
ctx.fillStyle = '#ffffff';
bodies.forEach(body => {
if (body.render.visible === false) return;
ctx.beginPath();
const vertices = body.vertices;
ctx.moveTo(vertices[0].x, vertices[0].y);
for (let j = 1; j < vertices.length; j += 1) {
ctx.lineTo(vertices[j].x, vertices[j].y);
}
ctx.lineTo(vertices[0].x, vertices[0].y);
ctx.closePath();
// Fill
ctx.fill();
// Stroke (for the paper look)
ctx.stroke();
});
requestAnimationFrame(renderLoop);
}
// --- 5. Event Listeners & Controls ---
// Resize
window.addEventListener('resize', () => {
resizeCanvas();
createPaper(container.clientWidth, container.clientHeight);
});
// Initialize
resizeCanvas();
createPaper(container.clientWidth, container.clientHeight);
renderLoop();
// Controls Logic
document.getElementById('gravity-toggle').addEventListener('change', (e) => {
world.gravity.y = e.target.checked ? 1 : 0;
});
document.getElementById('wind-toggle').addEventListener('change', (e) => {
// Simple wind effect: apply force to all dynamic bodies
const windStrength = 0.05;
const bodies = Composite.allBodies(world).filter(b => !b.isStatic);
if (e.target.checked) {
const windInterval = setInterval(() => {
if (!e.target.checked) {
clearInterval(windInterval);
return;
}
bodies.forEach(b => {
Body.applyForce(b, b.position, { x: windStrength, y: 0 });
});
}, 1000);
}
});
document.getElementById('friction').addEventListener('input', (e) => {
document.getElementById('val-friction').textContent = e.target.value;
if(paperBody) paperBody.friction = parseFloat(e.target.value);
});
document.getElementById('restitution').addEventListener('input', (e) => {
document.getElementById('val-restitution').textContent = e.target.value;
if(paperBody) paperBody.restitution = parseFloat(e.target.value);
});
document.getElementById('time-scale').addEventListener('input', (e) => {
const val = parseFloat(e.target.value);
engine.timing.timeScale = val;
document.getElementById('val-speed').textContent = val.toFixed(1) + 'x';
});
document.getElementById('rip-amount').addEventListener('input', (e) => {
document.getElementById('val-rip').textContent = e.target.value;
});
document.getElementById('extra-pieces').addEventListener('input', (e) => {
document.getElementById('val-pieces').textContent = e.target.value;
});
// Buttons
document.getElementById('btn-reset').addEventListener('click', () => {
createPaper(container.clientWidth, container.clientHeight);
});
document.getElementById('btn-explode').addEventListener('click', () => {
const bodies = Composite.allBodies(world).filter(b => !b.isStatic);
bodies.forEach(b => {
const forceMagnitude = 0.05 * b.mass;
Body.applyForce(b, b.position, {
x: (b.position.x - container.clientWidth/2) * 0.001 * forceMagnitude,
y: (b.position.y - container.clientHeight/2) * 0.001 * forceMagnitude
});
// Add confetti
for(let i=0; i<5; i++) {
particles.push({
x: b.position.x,
y: b.position.y,
vx: (Math.random() - 0.5) * 10,
vy: (Math.random() - 0.5) * 10,
life: 1.0,
color: `hsl(${Math.random()*360}, 70%, 50%)`,
size: Math.random() * 3 + 1
});
}
});
});
// Mouse Control (Tear on drag)
const mouse = Mouse.create(canvas);
const mouseConstraint = MouseConstraint.create(engine, {
mouse: mouse,
constraint: {
stiffness: 0.2,
render: { visible: false }
}
});
// Allow tearing on drag by checking velocity
Events.on(mouseConstraint, 'mousedown', function(event) {
// Check if we are clicking on paper
const mousePosition = event.mouse.position;
const bodies = Composite.allBodies(world);
// Simple raycast check or point query
const found = Matter.Query.point(bodies, mousePosition);
if (found.length > 0 && found[0].label === 'paper') {
tearPaper(10, 2); // High rip on click
}
});
Composite.add(world, mouseConstraint);
</script>
</body>
</html> |