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added raycasting demo

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liabru 2014-04-24 12:23:44 +01:00
parent a3a475fce7
commit 50224c55dc
2 changed files with 59 additions and 1 deletions
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1
demo/dev.html
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@ -25,6 +25,7 @@
<option value="wreckingBall">Wrecking Ball</option>
<option value="sprites">Sprites</option>
<option value="pyramid">Pyramid</option>
<option value="raycasting">Raycasting</option>
<option value="car">Car</option>
<option value="catapult">Catapult</option>
<option value="gravity">Reverse Gravity</option>

59
demo/js/Demo.js
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@ -15,7 +15,8 @@
Bounds = Matter.Bounds,
Vector = Matter.Vector,
Vertices = Matter.Vertices,
MouseConstraint = Matter.MouseConstraint;
MouseConstraint = Matter.MouseConstraint,
Query = Matter.Query;
var Demo = {};
@ -743,6 +744,62 @@
renderOptions.wireframes = false;
};
Demo.raycasting = function() {
var _world = _engine.world;
Demo.reset();
var stack = Composites.stack(20, 20, 15, 4, 0, 0, function(x, y, column, row) {
switch (Math.round(Common.random(0, 1))) {
case 0:
if (Math.random() < 0.8) {
return Bodies.rectangle(x, y, Common.random(20, 50), Common.random(20, 50));
} else {
return Bodies.rectangle(x, y, Common.random(80, 120), Common.random(20, 30));
}
break;
case 1:
var sides = Math.round(Common.random(1, 8));
sides = (sides === 3) ? 4 : sides;
return Bodies.polygon(x, y, sides, Common.random(20, 50));
}
});
World.add(_world, stack);
Events.on(_engine, 'afterRender', function() {
var mouse = _engine.input.mouse,
context = _engine.render.context,
bodies = Composite.allBodies(_engine.world),
startPoint = { x: 400, y: 100 },
endPoint = mouse.position;
var collisions = Query.ray(bodies, startPoint, endPoint);
context.beginPath();
context.moveTo(startPoint.x, startPoint.y);
context.lineTo(endPoint.x, endPoint.y);
if (collisions.length > 0) {
context.strokeStyle = '#fff';
} else {
context.strokeStyle = '#555';
}
context.lineWidth = 0.5;
context.stroke();
for (var i = 0; i < collisions.length; i++) {
var collision = collisions[i];
context.rect(collision.bodyA.position.x - 4.5, collision.bodyA.position.y - 4.5, 8, 8);
}
context.fillStyle = 'rgba(255,165,0,0.7)';
context.fill();
});
var renderOptions = _engine.render.options;
};
// the functions for the demo interface and controls below
Demo.initControls = function() {