mirror of
https://github.com/scratchfoundation/paper.js.git
synced 2025-01-03 19:45:44 -05:00
100 lines
No EOL
2.8 KiB
HTML
100 lines
No EOL
2.8 KiB
HTML
<!DOCTYPE html>
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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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<title>Example</title>
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<link rel="stylesheet" href="../css/style.css">
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<script type="text/javascript">var root = '../../'</script>
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<script type="text/javascript" src="../../src/load.js"></script>
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<script type="text/paperscript" canvas="canvas">
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var balls = [];
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var circlePath = new Path.Circle([0, 0], 10);
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circlePath.fillColor = new GradientColor(null, [0, 0], [0, 12], [0, 2]);
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circlePath.fillColor.gradient.type = 'radial';
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var symbol = new Symbol(circlePath);
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var group = new Group();
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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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this.vector = vector * 1.5;
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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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this.radius = 50 * Math.random() + 10;
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this.item = new PlacedSymbol(symbol);
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this.item.position = point;
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this.item.scale(this.radius / 10);
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group.appendTop(this.item);
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},
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contrainPoint: function() {
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var x = this.point.x;
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var y = this.point.y;
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var radius = this.radius;
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this.point.x = Math.min(Math.max(radius, x), document.size.width - radius);
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this.point.y = Math.min(Math.max(radius, y), document.size.height - radius);
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},
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iterate: function() {
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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 > document.size.width - this.radius)
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this.vector.x *= -this.dampen;
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if (pre.y < this.radius || pre.y > document.size.height - this.radius) {
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if (Math.abs(this.vector.x) < 3) {
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this.vector.x = Math.random() * 150 - 75;
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this.vector.y = Math.random() * 100 + 20;
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}
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this.vector.y *= this.bounce;
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}
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this.point = this.point + this.vector;
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this.contrainPoint();
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this.item.position = this.point;
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}
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});
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for (var i = 0; i < 10; i++) {
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var position = Point.random() * document.size;
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var vector = (Point.random() - [0.5, 0]) * [50, 100];
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var ball = new Ball(position, vector);
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balls.push(ball);
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}
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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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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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setInterval(draw, 30);
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var boundPath = new Path.Rectangle([-10, -10], [-11, -11]);
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boundPath.strokeColor = 'red';
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boundPath.strokeWidth = 1;
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function draw() {
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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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boundPath.bounds = group.bounds;
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document.redraw();
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}
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</script>
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</head>
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<body>
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<p>Click to add circles:</p>
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<canvas id='canvas' resize></canvas>
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</body> |