| 1 | <!DOCTYPE html>
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| 2 | <html>
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| 3 | <head>
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| 4 | <meta charset="UTF-8">
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| 5 | <title>Radial Rainbows</title>
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| 6 | <link rel="stylesheet" href="../css/style.css">
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| 7 | <script type="text/javascript" src="../../dist/paper.js"></script>
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| 8 | <script type="text/paperscript" canvas="canvas">
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| 9 | var point = view.center;
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| 10 |
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| 11 | var colors = [];
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| 12 | var cycles = 4;
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| 13 | for (var i = 0, l = 60; i < l; i++) {
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| 14 | var brightness = 1 - (i / l) * 1.5;
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| 15 | var hue = i / l * cycles * 360;
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| 16 | var color = {
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| 17 | hue: hue,
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| 18 | saturation: 1,
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| 19 | brightness: brightness
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| 20 | };
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| 21 | colors.push(color);
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| 22 | }
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| 23 |
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| 24 | var path = new Path.Rectangle(view.bounds);
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| 25 | var gradient = new Gradient(colors, true);
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| 26 | var radius = Math.max(view.size.width, view.size.height) * 0.75;
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| 27 | path.fillColor = new Color(gradient, point, point + [radius, 0]);
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| 28 | var gradientColor = path.fillColor;
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| 29 |
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| 30 | var mouseDown = false,
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| 31 | mousePoint = view.center;
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| 32 |
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| 33 | function onMouseDown(event) {
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| 34 | mouseDown = true;
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| 35 | mousePoint = event.point;
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| 36 | }
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| 37 |
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| 38 | function onMouseDrag(event) {
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| 39 | mousePoint = event.point;
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| 40 | }
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| 41 |
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| 42 | function onMouseUp(event) {
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| 43 | vector.length = 10;
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| 44 | mouseDown = false;
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| 45 | }
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| 46 |
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| 47 | var grow = false;
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| 48 | var vector = new Point(150, 0);
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| 49 |
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| 50 | function onFrame() {
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| 51 | for (var i = 0, l = gradient.stops.length; i < l; i++)
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| 52 | gradient.stops[i].color.hue -= 20;
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| 53 | if (grow && vector.length > 300) {
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| 54 | grow = false;
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| 55 | } else if (!grow && vector.length < 75) {
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| 56 | grow = true;
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| 57 | }
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| 58 | if (mouseDown) {
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| 59 | point = point + (mousePoint - point) / 10;
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| 60 | } else {
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| 61 | vector.length += (grow ? 1 : -1);
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| 62 | vector.angle += 5;
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| 63 | }
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| 64 | gradientColor.highlight = mouseDown ? point : point + vector;
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| 65 | }
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| 66 |
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| 67 | function onResize(event) {
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| 68 | point = view.center;
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| 69 | path.bounds = view.bounds;
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| 70 | var gradientColor = path.fillColor;
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| 71 | gradientColor.origin = point;
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| 72 | var radius = Math.max(view.size.width, view.size.height) * 0.75;
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| 73 | gradientColor.destination = point + [radius, 0];
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| 74 | }
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| 75 | </script>
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| 76 | </head>
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| 77 | <body>
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| 78 | <canvas id="canvas" resize></canvas>
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| 79 | </body>
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| 80 | </html> |
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