added example for Composite.remove

examples/index.js

@@ -27,6 +27,7 @@ module.exports = {
  raycasting: require('./raycasting.js'),
  restitution: require('./restitution.js'),
  rounded: require('./rounded.js'),
+ remove: require('./remove.js'),
  sensors: require('./sensors.js'),
  sleeping: require('./sleeping.js'),
  slingshot: require('./slingshot.js'),

examples/remove.js

@@ -0,0 +1,138 @@
+var Example = Example || {};
+
+Example.remove = function() {
+ var Engine = Matter.Engine,
+ Render = Matter.Render,
+ Runner = Matter.Runner,
+ Composites = Matter.Composites,
+ Common = Matter.Common,
+ MouseConstraint = Matter.MouseConstraint,
+ Mouse = Matter.Mouse,
+ Composite = Matter.Composite,
+ Bodies = Matter.Bodies,
+ Events = Matter.Events;
+
+ // create engine
+ var engine = Engine.create(),
+ world = engine.world;
+
+ // create renderer
+ var render = Render.create({
+ element: document.body,
+ engine: engine,
+ options: {
+ width: 800,
+ height: 600,
+ showAngleIndicator: true,
+ }
+ });
+
+ Render.run(render);
+
+ // create runner
+ var runner = Runner.create();
+ Runner.run(runner, engine);
+
+ var stack = null,
+ updateCount = 0;
+
+ var createStack = function() {
+ return Composites.stack(20, 20, 10, 5, 0, 0, function(x, y) {
+ var sides = Math.round(Common.random(1, 8));
+
+ // round the edges of some bodies
+ var chamfer = null;
+ if (sides > 2 && Common.random() > 0.7) {
+ chamfer = {
+ radius: 10
+ };
+ }
+
+ switch (Math.round(Common.random(0, 1))) {
+ case 0:
+ if (Common.random() < 0.8) {
+ return Bodies.rectangle(x, y, Common.random(25, 50), Common.random(25, 50), { chamfer: chamfer });
+ } else {
+ return Bodies.rectangle(x, y, Common.random(80, 120), Common.random(25, 30), { chamfer: chamfer });
+ }
+ case 1:
+ return Bodies.polygon(x, y, sides, Common.random(25, 50), { chamfer: chamfer });
+ }
+ });
+ };
+
+ // add and remove stacks every few updates
+ Events.on(engine, 'afterUpdate', function() {
+ // limit rate
+ if (stack && updateCount <= 50) {
+ updateCount += 1;
+ return;
+ }
+
+ updateCount = 0;
+
+ // remove last stack
+ if (stack) {
+ Composite.remove(world, stack);
+ }
+
+ // create a new stack
+ stack = createStack();
+
+ // add the new stack
+ Composite.add(world, stack);
+ });
+
+ // add another stack that will not be removed
+ Composite.add(world, createStack());
+
+ Composite.add(world, [
+ // walls
+ Bodies.rectangle(400, 0, 800, 50, { isStatic: true }),
+ Bodies.rectangle(400, 600, 800, 50, { isStatic: true }),
+ Bodies.rectangle(800, 300, 50, 600, { isStatic: true }),
+ Bodies.rectangle(0, 300, 50, 600, { isStatic: true })
+ ]);
+
+ // add mouse control
+ var mouse = Mouse.create(render.canvas),
+ mouseConstraint = MouseConstraint.create(engine, {
+ mouse: mouse,
+ constraint: {
+ stiffness: 0.2,
+ render: {
+ visible: false
+ }
+ }
+ });
+
+ Composite.add(world, mouseConstraint);
+
+ // keep the mouse in sync with rendering
+ render.mouse = mouse;
+
+ // fit the render viewport to the scene
+ Render.lookAt(render, {
+ min: { x: 0, y: 0 },
+ max: { x: 800, y: 600 }
+ });
+
+ // context for MatterTools.Demo
+ return {
+ engine: engine,
+ runner: runner,
+ render: render,
+ canvas: render.canvas,
+ stop: function() {
+ Matter.Render.stop(render);
+ Matter.Runner.stop(runner);
+ }
+ };
+};
+
+Example.remove.title = 'Composite Remove';
+Example.remove.for = '>=0.14.2';
+
+if (typeof module !== 'undefined') {
+ module.exports = Example.remove;
+}