94 lines
2.3 KiB
JavaScript
94 lines
2.3 KiB
JavaScript
function drawWorld(world, context) {
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for (var j = world.m_jointList; j; j = j.m_next) {
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drawJoint(j, context);
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}
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for (var b = world.m_bodyList; b; b = b.m_next) {
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for (var s = b.GetShapeList(); s != null; s = s.GetNext()) {
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drawShape(s, context);
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}
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}
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}
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function drawJoint(joint, context) {
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var b1 = joint.m_body1;
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var b2 = joint.m_body2;
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var x1 = b1.m_position;
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var x2 = b2.m_position;
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var p1 = joint.GetAnchor1();
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var p2 = joint.GetAnchor2();
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context.strokeStyle = '#00eeee';
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context.beginPath();
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switch (joint.m_type) {
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case b2Joint.e_distanceJoint:
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context.moveTo(p1.x, p1.y);
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context.lineTo(p2.x, p2.y);
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break;
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case b2Joint.e_pulleyJoint:
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// TODO
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break;
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default:
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if (b1 == world.m_groundBody) {
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context.moveTo(p1.x, p1.y);
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context.lineTo(x2.x, x2.y);
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}
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else if (b2 == world.m_groundBody) {
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context.moveTo(p1.x, p1.y);
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context.lineTo(x1.x, x1.y);
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}
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else {
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context.moveTo(x1.x, x1.y);
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context.lineTo(p1.x, p1.y);
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context.lineTo(x2.x, x2.y);
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context.lineTo(p2.x, p2.y);
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}
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break;
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}
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context.stroke();
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}
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function drawShape(shape, context) {
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context.strokeStyle = '#ffffff';
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context.beginPath();
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switch (shape.m_type) {
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case b2Shape.e_circleShape:
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{
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var circle = shape;
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var pos = circle.m_position;
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var r = circle.m_radius;
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var segments = 16.0;
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var theta = 0.0;
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var dtheta = 2.0 * Math.PI / segments;
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// draw circle
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context.moveTo(pos.x + r, pos.y);
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for (var i = 0; i < segments; i++) {
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var d = new b2Vec2(r * Math.cos(theta), r * Math.sin(theta));
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var v = b2Math.AddVV(pos, d);
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context.lineTo(v.x, v.y);
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theta += dtheta;
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}
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context.lineTo(pos.x + r, pos.y);
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// draw radius
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context.moveTo(pos.x, pos.y);
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var ax = circle.m_R.col1;
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var pos2 = new b2Vec2(pos.x + r * ax.x, pos.y + r * ax.y);
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context.lineTo(pos2.x, pos2.y);
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}
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break;
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case b2Shape.e_polyShape:
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{
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var poly = shape;
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var tV = b2Math.AddVV(poly.m_position, b2Math.b2MulMV(poly.m_R, poly.m_vertices[0]));
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context.moveTo(tV.x, tV.y);
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for (var i = 0; i < poly.m_vertexCount; i++) {
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var v = b2Math.AddVV(poly.m_position, b2Math.b2MulMV(poly.m_R, poly.m_vertices[i]));
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context.lineTo(v.x, v.y);
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}
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context.lineTo(tV.x, tV.y);
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}
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break;
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}
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context.stroke();
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}
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