58 lines
1.8 KiB
JavaScript
58 lines
1.8 KiB
JavaScript
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demos.compound = {};
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demos.compound.createCompoundBall = function(world, x, y) {
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var ballSd1 = new b2CircleDef();
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ballSd1.density = 1.0;
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ballSd1.radius = 20;
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ballSd1.restitution = 0.2;
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ballSd1.localPosition.Set(-20, 0);
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var ballSd2 = new b2CircleDef();
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ballSd2.density = 1.0;
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ballSd2.radius = 20;
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ballSd2.restitution = 0.2;
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ballSd2.localPosition.Set(20, 0);
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var ballBd = new b2BodyDef();
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ballBd.AddShape(ballSd1);
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ballBd.AddShape(ballSd2);
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ballBd.position.Set(x, y);
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return world.CreateBody(ballBd);
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}
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demos.compound.createCompoundPoly = function(world, x, y) {
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var points = [[-30, 0], [30, 0], [0, 15]];
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var polySd1 = new b2PolyDef();
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polySd1.vertexCount = points.length;
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for (var i = 0; i < points.length; i++) {
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polySd1.vertices[i].Set(points[i][0], points[i][1]);
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}
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polySd1.localRotation = 0.3524 * Math.PI;
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var R1 = new b2Mat22(polySd1.localRotation);
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polySd1.localPosition = b2Math.b2MulMV(R1, new b2Vec2(30, 0));
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polySd1.density = 1.0;
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var polySd2 = new b2PolyDef();
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polySd2.vertexCount = points.length;
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for (var i = 0; i < points.length; i++) {
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polySd2.vertices[i].Set(points[i][0], points[i][1]);
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}
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polySd2.localRotation = -0.3524 * Math.PI;
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var R2 = new b2Mat22(polySd2.localRotation);
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polySd2.localPosition = b2Math.b2MulMV(R2, new b2Vec2(-30, 0));
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var polyBd = new b2BodyDef();
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polyBd.AddShape(polySd1);
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polyBd.AddShape(polySd2);
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polyBd.position.Set(x,y);
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return world.CreateBody(polyBd)
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}
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demos.compound.initWorld = function(world) {
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var i;
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for (i = 1; i <= 4; i++) {
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demos.compound.createCompoundPoly(world, 150 + 3 * Math.random(), 40 * i);
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}
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for (i = 1; i <= 4; i++) {
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demos.compound.createCompoundBall(world, 350 + 3 * Math.random(), 45 * i);
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}
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}
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demos.InitWorlds.push(demos.compound.initWorld);
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