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Code Issues Wiki Activity

added events demo

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liabru 2014-03-10 21:56:31 +00:00
parent a368828e3f
commit 2b68e6da96
1 changed files with 82 additions and 2 deletions
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84
demo/js/Demo.js
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@ -9,7 +9,8 @@
Composite = Matter.Composite,
Composites = Matter.Composites,
Common = Matter.Common,
Constraint = Matter.Constraint;
Constraint = Matter.Constraint,
Events = Matter.Events;
var Demo = {};
@ -85,6 +86,9 @@
World.clear(_world);
Engine.clear(_engine);
if (Events)
Events.clear(_engine);
_engine.enableSleeping = false;
_engine.world.gravity.y = 1;
@ -97,7 +101,7 @@
var renderOptions = _engine.render.options;
renderOptions.wireframes = true;
renderOptions.showDebug = false;
renderOptions.showDebug = true;
renderOptions.showBroadphase = false;
renderOptions.showBounds = false;
renderOptions.showVelocity = false;
@ -511,4 +515,80 @@
World.addComposite(_world, stack);
};
Demo.events = function() {
var _world = _engine.world;
Demo.reset();
var stack = Composites.stack(50, 100, 8, 4, 50, 50, function(x, y, column, row) {
return Bodies.circle(x, y, 15, { restitution: 1, strokeStyle: '#777' });
});
World.addComposite(_world, stack);
//_engine.enableSleeping = true;
// an example of using beforeUpdate event on an engine
Events.on(_engine, 'beforeUpdate', function(event) {
var engine = event.source;
// apply random forces every 5 secs
if (event.timestamp % 5000 < 50) {
var bodies = engine.world.bodies;
for (var i = 0; i < bodies.length; i++) {
var body = bodies[i];
if (!body.isStatic && body.position.y >= 500) {
var forceMagnitude = 0.01 * body.mass;
Body.applyForce(body, { x: 0, y: 0 }, {
x: (forceMagnitude + Math.random() * forceMagnitude) * Common.choose([1, -1]),
y: -forceMagnitude + Math.random() * -forceMagnitude
});
}
}
}
});
// an example of using collisionStart event on an engine
Events.on(_engine, 'collisionStart', function(event) {
var pairs = event.pairs;
// change object colours to show those starting a collision
for (var i = 0; i < pairs.length; i++) {
var pair = pairs[i];
pair.bodyA.fillStyle = '#bbbbbb';
pair.bodyB.fillStyle = '#bbbbbb';
}
});
// an example of using collisionActive event on an engine
Events.on(_engine, 'collisionActive', function(event) {
var pairs = event.pairs;
// change object colours to show those in an active collision (e.g. resting contact)
for (var i = 0; i < pairs.length; i++) {
var pair = pairs[i];
pair.bodyA.fillStyle = '#aaaaaa';
pair.bodyB.fillStyle = '#aaaaaa';
}
});
// an example of using collisionEnd event on an engine
Events.on(_engine, 'collisionEnd', function(event) {
var pairs = event.pairs;
// change object colours to show those ending a collision
for (var i = 0; i < pairs.length; i++) {
var pair = pairs[i];
pair.bodyA.fillStyle = '#999999';
pair.bodyB.fillStyle = '#999999';
}
});
var renderOptions = _engine.render.options;
renderOptions.wireframes = false;
};
})();