| 1 | <!DOCTYPE html>
|
|---|
| 2 | <html>
|
|---|
| 3 | <head>
|
|---|
| 4 | <meta charset="UTF-8">
|
|---|
| 5 | <title>Future Splash</title>
|
|---|
| 6 | <link rel="stylesheet" href="../css/style.css">
|
|---|
| 7 | <script type="text/javascript" src="../../dist/paper.js"></script>
|
|---|
| 8 | <script type="text/paperscript" canvas="canvas">
|
|---|
| 9 | // Code ported to Paper.js from http://the389.com/9/1/
|
|---|
| 10 | // with permission.
|
|---|
| 11 |
|
|---|
| 12 | var values = {
|
|---|
| 13 | friction: 0.8,
|
|---|
| 14 | timeStep: 0.01,
|
|---|
| 15 | amount: 15,
|
|---|
| 16 | mass: 2,
|
|---|
| 17 | count: 0
|
|---|
| 18 | };
|
|---|
| 19 | values.invMass = 1 / values.mass;
|
|---|
| 20 |
|
|---|
| 21 | var path, springs;
|
|---|
| 22 | var size = view.size * [1.2, 1];
|
|---|
| 23 |
|
|---|
| 24 | var Spring = function(a, b, strength, restLength) {
|
|---|
| 25 | this.a = a;
|
|---|
| 26 | this.b = b;
|
|---|
| 27 | this.restLength = restLength || 80;
|
|---|
| 28 | this.strength = strength ? strength : 0.55;
|
|---|
| 29 | this.mamb = values.invMass * values.invMass;
|
|---|
| 30 | };
|
|---|
| 31 |
|
|---|
| 32 | Spring.prototype.update = function() {
|
|---|
| 33 | var delta = this.b - this.a;
|
|---|
| 34 | var dist = delta.length;
|
|---|
| 35 | var normDistStrength = (dist - this.restLength) /
|
|---|
| 36 | (dist * this.mamb) * this.strength;
|
|---|
| 37 | delta.y *= normDistStrength * values.invMass * 0.2;
|
|---|
| 38 | if (!this.a.fixed)
|
|---|
| 39 | this.a.y += delta.y;
|
|---|
| 40 | if (!this.b.fixed)
|
|---|
| 41 | this.b.y -= delta.y;
|
|---|
| 42 | };
|
|---|
| 43 |
|
|---|
| 44 |
|
|---|
| 45 | function createPath(strength) {
|
|---|
| 46 | var path = new Path({
|
|---|
| 47 | fillColor: 'black'
|
|---|
| 48 | });
|
|---|
| 49 | springs = [];
|
|---|
| 50 | for (var i = 0; i <= values.amount; i++) {
|
|---|
| 51 | var segment = path.add(new Point(i / values.amount, 0.5) * size);
|
|---|
| 52 | var point = segment.point;
|
|---|
| 53 | if (i == 0 || i == values.amount)
|
|---|
| 54 | point.y += size.height;
|
|---|
| 55 | point.px = point.x;
|
|---|
| 56 | point.py = point.y;
|
|---|
| 57 | // The first two and last two points are fixed:
|
|---|
| 58 | point.fixed = i < 2 || i > values.amount - 2;
|
|---|
| 59 | if (i > 0) {
|
|---|
| 60 | var spring = new Spring(segment.previous.point, point, strength);
|
|---|
| 61 | springs.push(spring);
|
|---|
| 62 | }
|
|---|
| 63 | }
|
|---|
| 64 | path.position.x -= size.width / 4;
|
|---|
| 65 | return path;
|
|---|
| 66 | }
|
|---|
| 67 |
|
|---|
| 68 | function onResize() {
|
|---|
| 69 | if (path)
|
|---|
| 70 | path.remove();
|
|---|
| 71 | size = view.bounds.size * [2, 1];
|
|---|
| 72 | path = createPath(0.1);
|
|---|
| 73 | }
|
|---|
| 74 |
|
|---|
| 75 | function onMouseMove(event) {
|
|---|
| 76 | var location = path.getNearestLocation(event.point);
|
|---|
| 77 | var segment = location.segment;
|
|---|
| 78 | var point = segment.point;
|
|---|
| 79 |
|
|---|
| 80 | if (!point.fixed && location.distance < size.height / 4) {
|
|---|
| 81 | var y = event.point.y;
|
|---|
| 82 | point.y += (y - point.y) / 6;
|
|---|
| 83 | if (segment.previous && !segment.previous.fixed) {
|
|---|
| 84 | var previous = segment.previous.point;
|
|---|
| 85 | previous.y += (y - previous.y) / 24;
|
|---|
| 86 | }
|
|---|
| 87 | if (segment.next && !segment.next.fixed) {
|
|---|
| 88 | var next = segment.next.point;
|
|---|
| 89 | next.y += (y - next.y) / 24;
|
|---|
| 90 | }
|
|---|
| 91 | }
|
|---|
| 92 | }
|
|---|
| 93 |
|
|---|
| 94 | function onFrame(event) {
|
|---|
| 95 | updateWave(path);
|
|---|
| 96 | }
|
|---|
| 97 |
|
|---|
| 98 | function updateWave(path) {
|
|---|
| 99 | var force = 1 - values.friction * values.timeStep * values.timeStep;
|
|---|
| 100 | for (var i = 0, l = path.segments.length; i < l; i++) {
|
|---|
| 101 | var point = path.segments[i].point;
|
|---|
| 102 | var dy = (point.y - point.py) * force;
|
|---|
| 103 | point.py = point.y;
|
|---|
| 104 | point.y = Math.max(point.y + dy, 0);
|
|---|
| 105 | }
|
|---|
| 106 |
|
|---|
| 107 | for (var j = 0, l = springs.length; j < l; j++) {
|
|---|
| 108 | springs[j].update();
|
|---|
| 109 | }
|
|---|
| 110 | path.smooth();
|
|---|
| 111 | }
|
|---|
| 112 |
|
|---|
| 113 | function onKeyDown(event) {
|
|---|
| 114 | if (event.key == 'space') {
|
|---|
| 115 | path.fullySelected = !path.fullySelected;
|
|---|
| 116 | path.fillColor = path.fullySelected ? null : 'black';
|
|---|
| 117 | }
|
|---|
| 118 | }
|
|---|
| 119 | </script>
|
|---|
| 120 | </head>
|
|---|
| 121 | <body>
|
|---|
| 122 | <canvas id="canvas" resize hidpi="off"></canvas>
|
|---|
| 123 | </body>
|
|---|
| 124 | </html> |
|---|
