p2s
Version:
A JavaScript 2D physics engine.
94 lines (81 loc) • 2.85 kB
HTML
<html>
<head>
<title>Constraints demo - p2.js physics engine</title>
<script src="../build/p2.js"></script>
<script src="../build/p2.renderer.js"></script>
<link href="css/demo.css" rel="stylesheet"/>
<meta name="description" content="Tests a few constraints.">
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
</head>
<body>
<script>
var N = 10, // Number of circles
r = 0.1; // circle radius
// Create demo application
var app = new p2.WebGLRenderer(function(){
var world = new p2.World({
gravity : [0,-15]
});
this.setWorld(world);
world.solver.iterations = N;
// Add a line
lineBody = new p2.Body({
mass: 1,
position: [-1.5,-0.5],
angle: Math.PI / 2,
angularVelocity : 10
});
lineBody.addShape(new p2.Line({ length: 1 }));
world.addBody(lineBody);
// Add a "null" body
var groundBody = new p2.Body();
world.addBody(groundBody);
var revolute = new p2.RevoluteConstraint(lineBody, groundBody, {
worldPivot: [-1.5, 0]
});
world.addConstraint(revolute);
// Create circle rope
var lastBody;
for(var i=N-1; i>=0; i--){
var x = 0;
var y = (N-i - N/2) * r * 2.1;
var p = new p2.Body({
mass: i==0 ? 0 : 1,
position: [x,y],
});
p.addShape(new p2.Circle({ radius: r }));
world.addBody(p);
if(lastBody){
var c = new p2.DistanceConstraint(p, lastBody);
world.addConstraint(c);
} else {
p.velocity[0] = 10;
}
lastBody = p;
}
// Create RevoluteConstraint
var bodyA = new p2.Body({
mass: 1,
position: [3,0],
angularVelocity: 30
});
bodyA.addShape(new p2.Circle({ radius: 1 }));
world.addBody(bodyA);
var bodyB = new p2.Body({
mass: 0,
position: [3,4],
});
bodyB.addShape(new p2.Circle({ radius: 1 }));
world.addBody(bodyB);
var cr = new p2.RevoluteConstraint(bodyA, bodyB, {
worldPivot: [3, 2]
});
cr.setLimits(-Math.PI / 4, Math.PI / 4);
world.addConstraint(cr);
this.frame(0, 0, 8, 8);
});
</script>
</body>
</html>