Demonstração do jogo de física ragdoll Matter.js

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Demonstração do jogo de física ragdoll Matter.js

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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Ragdoll Game</title>
  <style>
    body { margin: 0; overflow: hidden; background: #e0e0e0; }
    #controls {
      position: fixed; top: 10px; left: 10px; z-index: 2;
      display: flex; flex-direction: column; gap: 10px;
    }
    #spawnBtn {
      position: fixed; top: 10px; right: 10px; z-index: 2;
      padding: 8px 16px; font-size: 16px; background: #4caf50; color: #fff; border: none; border-radius: 5px; cursor: pointer;
    }
    button { padding: 8px 16px; font-size: 16px; border-radius: 5px; border: none; cursor: pointer; }
    canvas { background: #fff; display: block; }
  </style>
</head>
<body>
  <div id="controls">
    <button onclick="spawnRagdoll()">Ragdoll</button>
    <button onclick="spawnSword()">Sword</button>
    <button onclick="spawnBox()">Box</button>
  </div>
  <button id="spawnBtn" onclick="spawnShapes()">Spawn Shapes</button>
  <canvas id="world"></canvas>
  
  <script src="https://cdn.jsdelivr.net/npm/matter-js@0.19.0/build/matter.min.js"></script>
  <script>
    const { Engine, Render, World, Bodies, Body, Constraint, Mouse, MouseConstraint, Composite } = Matter;

const engine = Engine.create();
    const world = engine.world;
    const canvas = document.getElementById('world');
    canvas.width = window.innerWidth;
    canvas.height = window.innerHeight;

const render = Render.create({
      canvas: canvas,
      engine: engine,
      options: {
        width: window.innerWidth,
        height: window.innerHeight,
        wireframes: false,
        background: '#fff'
      }
    });

Render.run(render);
    Engine.run(engine);

// Ground
    World.add(world, [
      Bodies.rectangle(window.innerWidth / 2, window.innerHeight, window.innerWidth, 40, { isStatic: true })
    ]);

// Mouse control
    const mouse = Mouse.create(render.canvas);
    const mouseConstraint = MouseConstraint.create(engine, {
      mouse: mouse,
      constraint: { stiffness: 0.2, render: { visible: false } }
    });
    World.add(world, mouseConstraint);

// Helper: Spawn Ragdoll
    function spawnRagdoll() {
      // Simple stick-figure ragdoll with constraints
      const x = 200 + Math.random() * 200;
      const y = 100;
      // Body parts
      const head = Bodies.circle(x, y, 20, { density: 0.01, restitution: 0.7 });
      const torso = Bodies.rectangle(x, y + 60, 20, 60, { density: 0.01 });
      const leftArm = Bodies.rectangle(x - 30, y + 60, 40, 12, { density: 0.005 });
      const rightArm = Bodies.rectangle(x + 30, y + 60, 40, 12, { density: 0.005 });
      const leftLeg = Bodies.rectangle(x - 10, y + 120, 12, 40, { density: 0.005 });
      const rightLeg = Bodies.rectangle(x + 10, y + 120, 12, 40, { density: 0.005 });

// Constraints (joints)
      const constraints = [
        Constraint.create({ bodyA: head, pointA: {x:0, y:20}, bodyB: torso, pointB: {x:0, y:-30}, stiffness: 0.5, length: 0, render: { visible: false } }),
        Constraint.create({ bodyA: torso, pointA: {x:-10, y:-20}, bodyB: leftArm, pointB: {x:20, y:0}, stiffness: 0.5, length: 0, render: { visible: false } }),
        Constraint.create({ bodyA: torso, pointA: {x:10, y:-20}, bodyB: rightArm, pointB: {x:-20, y:0}, stiffness: 0.5, length: 0, render: { visible: false } }),
        Constraint.create({ bodyA: torso, pointA: {x:-7, y:30}, bodyB: leftLeg, pointB: {x:0, y:-20}, stiffness: 0.5, length: 0, render: { visible: false } }),
        Constraint.create({ bodyA: torso, pointA: {x:7, y:30}, bodyB: rightLeg, pointB: {x:0, y:-20}, stiffness: 0.5, length: 0, render: { visible: false } }),
      ];

World.add(world, [head, torso, leftArm, rightArm, leftLeg, rightLeg, ...constraints]);
    }

// Helper: Spawn Sword
    function spawnSword() {
      const x = 300 + Math.random() * 200;
      const y = 100;
      const sword = Bodies.rectangle(x, y, 80, 10, { density: 0.02, restitution: 0.2, render: { fillStyle: '#444' } });
      World.add(world, sword);
    }

// Helper: Spawn Box
    function spawnBox() {
      const x = 400 + Math.random() * 200;
      const y = 100;
      const box = Bodies.rectangle(x, y, 40, 40, { density: 0.01, restitution: 0.6, render: { fillStyle: '#8bc34a' } });
      World.add(world, box);
    }

// Spawn Cube, Circle, Triangle
    function spawnShapes() {
      const x = 100 + Math.random() * (window.innerWidth - 200);
      const y = 100;
      // Cube
      const cube = Bodies.rectangle(x, y, 40, 40, { restitution: 0.7, render: { fillStyle: '#f44336' } });
      // Circle
      const circle = Bodies.circle(x + 60, y, 20, { restitution: 0.7, render: { fillStyle: '#2196f3' } });
      // Triangle (polygon with 3 sides)
      const triangle = Bodies.polygon(x + 120, y, 3, 30, { restitution: 0.7, render: { fillStyle: '#ffeb3b' } });

World.add(world, [cube, circle, triangle]);
    }

// Ragdoll destruction logic (rip apart with force)
    Matter.Events.on(engine, 'beforeUpdate', function() {
      Composite.allConstraints(world).forEach(constraint => {
        // Check force on constraint
        if (constraint.bodyA && constraint.bodyB) {
          const dx = (constraint.bodyA.position.x + (constraint.pointA?.x||0)) - (constraint.bodyB.position.x + (constraint.pointB?.x||0));
          const dy = (constraint.bodyA.position.y + (constraint.pointA?.y||0)) - (constraint.bodyB.position.y + (constraint.pointB?.y||0));
          const dist = Math.sqrt(dx*dx + dy*dy);
          if (dist > 80) { // threshold to "rip apart"
            World.remove(world, constraint);
          }
        }
      });
    });

window.addEventListener('resize', () => {
      canvas.width = window.innerWidth;
      canvas.height = window.innerHeight;
      render.options.width = window.innerWidth;
      render.options.height = window.innerHeight;
    });
  </script>
</body>
</html>

Demonstração do jogo de física ragdoll Matter.js

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