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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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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2011-06-30 09:57:17 -04:00
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<title>Bouncing Balls</title>
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2011-05-05 11:25:17 -04:00
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<link rel="stylesheet" href="../css/style.css">
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2011-06-12 14:03:18 -04:00
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<script type="text/javascript" src="../../dist/paper.js"></script>
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2011-03-04 06:38:38 -05:00
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<script type="text/paperscript" canvas="canvas">
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2011-05-15 06:36:10 -04:00
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var balls = [];
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var group = new Group();
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2011-02-20 21:37:35 -05:00
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2011-03-04 06:38:38 -05:00
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var Ball = Base.extend({
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initialize: 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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2011-06-19 11:34:32 -04:00
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this.vector = vector * 2;
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2011-03-04 06:38:38 -05:00
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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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this.radius = 50 * Math.random() + 30;
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this.createPaths();
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group.addChild(this.item);
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},
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createPaths: function() {
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var overlayPos = this.point + this.radius / 8;
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var compound = new CompoundPath([
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new Path.Circle(this.point, this.radius),
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new Path.Circle(overlayPos, this.radius / 2)
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]);
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2011-11-10 13:16:34 -05:00
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var color = new HsbColor(Math.random() * 360, 1, 1);
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2013-03-01 20:44:16 -05:00
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var gradient = new RadialGradient(color, 'black');
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2012-11-22 15:08:17 -05:00
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compound.fillColor = new GradientColor(gradient, this.point,
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2011-06-19 11:34:32 -04:00
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this.point + this.radius, overlayPos);
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var overlay = new Path.Circle(overlayPos, this.radius / 2);
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var overlayColor = color.clone();
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var fullOverlay = color.clone();
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overlayColor.alpha = 0.5;
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2013-03-01 20:44:16 -05:00
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var overlayGradient = new LinearGradient(new RgbColor(1, 1, 1, 0.5), new RgbColor(1, 1, 1, 1));
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2011-06-19 11:34:32 -04:00
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overlay.fillColor = new GradientColor(overlayGradient, overlayPos, overlayPos + this.radius / 2);
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2012-11-06 23:37:50 -05:00
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this.item = new Group(compound, overlay);
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2011-03-04 06:38:38 -05:00
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},
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2011-02-20 21:37:35 -05:00
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2011-03-04 06:38:38 -05:00
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iterate: function() {
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2011-05-16 07:51:20 -04:00
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var size = view.size;
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2011-03-04 06:38:38 -05:00
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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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2011-05-06 10:34:27 -04:00
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if (pre.x < this.radius || pre.x > size.width - this.radius)
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2011-07-07 10:09:02 -04:00
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this.vector.x *= -this.dampen;
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2011-05-06 10:34:27 -04:00
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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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2011-03-04 06:38:38 -05:00
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this.vector.y *= this.bounce;
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2011-02-16 18:35:10 -05:00
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}
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2011-06-19 11:34:32 -04:00
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2011-05-06 10:34:27 -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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2011-05-08 10:44:19 -04:00
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this.item.rotate(this.vector.x / 2);
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2011-03-04 06:38:38 -05:00
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}
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});
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2011-02-20 21:37:35 -05:00
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2011-03-04 06:38:38 -05:00
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for (var i = 0; i < 10; i++) {
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2011-06-19 11:34:32 -04:00
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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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2011-03-04 06:38:38 -05:00
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balls.push(ball);
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}
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2011-06-19 11:34:32 -04:00
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var textItem = new PointText(20, 30);
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textItem.fillColor = 'black';
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textItem.content = 'Click, drag and release to add balls.'
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2011-03-04 06:38:38 -05:00
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var lastDelta;
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2011-03-04 06:44:02 -05:00
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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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2011-03-04 06:44:02 -05:00
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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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2011-05-06 10:34:27 -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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2011-03-04 06:38:38 -05:00
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balls[i].iterate();
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2011-02-16 18:35:10 -05:00
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}
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</script>
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</head>
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<body>
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2011-06-29 07:44:06 -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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</html>
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