2011-02-21 08:31:26 -05:00
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<!DOCTYPE html>
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2011-02-16 18:35:10 -05:00
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<html>
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<head>
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2014-08-16 13:24:54 -04:00
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<meta charset="UTF-8">
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<title>Bouncing Balls</title>
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<link rel="stylesheet" href="../css/style.css">
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<script type="text/javascript" src="../../dist/paper-full.js"></script>
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<script type="text/paperscript" canvas="canvas">
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var Ball = function(point, vector) {
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if (!vector || vector.isZero()) {
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this.vector = Point.random() * 5;
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} else {
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this.vector = vector * 2;
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}
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this.point = point;
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this.dampen = 0.4;
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this.gravity = 3;
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this.bounce = -0.6;
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2011-06-19 11:34:32 -04:00
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2014-08-16 13:24:54 -04:00
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var color = {
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hue: Math.random() * 360,
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saturation: 1,
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brightness: 1
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};
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var gradient = new Gradient([color, 'black'], true);
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2011-02-20 21:37:35 -05:00
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2014-08-16 13:24:54 -04:00
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var radius = this.radius = 50 * Math.random() + 30;
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// Wrap CompoundPath in a Group, since CompoundPaths directly
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// applies the transformations to the content, just like Path.
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var ball = new CompoundPath({
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children: [
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new Path.Circle({
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radius: radius
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}),
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new Path.Circle({
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center: radius / 8,
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radius: radius / 3
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})
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],
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fillColor: new Color(gradient, 0, radius, radius / 8),
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});
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2013-05-13 21:57:17 -04:00
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2014-08-16 13:24:54 -04:00
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this.item = new Group({
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children: [ball],
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applyMatrix: false,
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position: this.point
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});
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}
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2011-06-19 11:34:32 -04:00
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2014-08-16 13:24:54 -04:00
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Ball.prototype.iterate = function() {
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var size = view.size;
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this.vector.y += this.gravity;
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this.vector.x *= 0.99;
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var pre = this.point + this.vector;
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if (pre.x < this.radius || pre.x > size.width - this.radius)
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this.vector.x *= -this.dampen;
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if (pre.y < this.radius || pre.y > size.height - this.radius) {
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if (Math.abs(this.vector.x) < 3)
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this.vector = Point.random() * [150, 100] + [-75, 20];
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this.vector.y *= this.bounce;
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}
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2011-02-20 21:37:35 -05:00
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2014-08-16 13:24:54 -04:00
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var max = Point.max(this.radius, this.point + this.vector);
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this.item.position = this.point = Point.min(max, size - this.radius);
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this.item.rotate(this.vector.x);
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};
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2013-03-02 14:58:56 -05:00
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2014-08-16 13:24:54 -04:00
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var balls = [];
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for (var i = 0; i < 10; i++) {
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var position = Point.random() * view.size,
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vector = (Point.random() - [0.5, 0]) * [50, 100],
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ball = new Ball(position, vector);
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balls.push(ball);
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}
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2011-03-04 06:38:38 -05:00
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2014-08-16 13:24:54 -04:00
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var textItem = new PointText({
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point: [20, 30],
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fillColor: 'black',
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content: 'Click, drag and release to add balls.'
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});
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2011-06-19 11:34:32 -04:00
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2014-08-16 13:24:54 -04:00
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var lastDelta;
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function onMouseDrag(event) {
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lastDelta = event.delta;
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}
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2011-06-19 11:34:32 -04:00
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2014-08-16 13:24:54 -04:00
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function onMouseUp(event) {
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var ball = new Ball(event.point, lastDelta);
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balls.push(ball);
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lastDelta = null;
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}
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2011-02-20 21:37:35 -05:00
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2014-08-16 13:24:54 -04:00
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function onFrame() {
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for (var i = 0, l = balls.length; i < l; i++)
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balls[i].iterate();
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}
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</script>
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2011-02-16 18:35:10 -05:00
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</head>
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<body>
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2014-08-16 13:24:54 -04:00
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<canvas id="canvas" resize></canvas>
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2011-05-30 18:27:39 -04:00
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</body>
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2014-04-06 07:44:19 -04:00
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</html>
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