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<!doctype html>
<html>
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>canvas炫酷動畫飛爆效果</title>
<style>
body{background-color:#2E2E2E;margin:0;overflow:hidden;}
.lanren-header{color:#fff;}
#info{color:white;font-family:monospace;}
canvas{position:absolute;backface-visibility:hidden;-webkit-backface-visibility:hidden;-moz-backface-visibility:hidden;-ms-backface-visibility:hidden;}
img{position:absolute;cursor:pointer;}
#container{position:absolute;width:768px;height:485px;left:0;right:0;top:0;bottom:0;margin:auto;}
</style>
<!--[if IE]>
<script src="http://libs.useso.com/js/html5shiv/3.7/html5shiv.min.js"></script>
<![endif]-->
</head>
<body>
<!-- 代碼部分begin -->
<div>
<div id="container"></div>
</div>
<script src="js/delaunay.js"></script>
<script src="js/TweenMax.min.js"></script>
<script src='js/stopExecutionOnTimeout.js?t=1'></script>
<script>
const TWO_PI = Math.PI * 2;
var images = [], imageIndex = 0;
var image, imageWidth = 768, imageHeight = 485;
var vertices = [], indices = [], fragments = [];
var container = document.getElementById('container');
var clickPosition = [
imageWidth * 0.5,
imageHeight * 0.5
];
window.onload = function () {
TweenMax.set(container, { perspective: 500 });
var urls = [
'images/crayon.jpg',
'images/spaceship.jpg',
'images/dj.jpg',
'images/chicken.jpg'
], image, loaded = 0;
images[0] = image = new Image();
image.onload = function () {
if (++loaded === 1) {
imagesLoaded();
for (var i = 1; i < 4; i++) {
if (window.CP.shouldStopExecution(1)) {
break;
}
images[i] = image = new Image();
image.src = urls[i];
}
window.CP.exitedLoop(1);
}
};
image.src = urls[0];
};
function imagesLoaded() {
placeImage(false);
triangulate();
shatter();
}
function placeImage(transitionIn) {
image = images[imageIndex];
if (++imageIndex === images.length)
imageIndex = 0;
image.addEventListener('click', imageClickHandler);
container.appendChild(image);
if (transitionIn !== false) {
TweenMax.fromTo(image, 0.75, { y: -1000 }, {
y: 0,
ease: Elastic.easeOut
});
}
}
function imageClickHandler(event) {
var box = image.getBoundingClientRect(), top = box.top, left = box.left;
clickPosition[0] = event.clientX - left;
clickPosition[1] = event.clientY - top;
triangulate();
shatter();
}
function triangulate() {
var rings = [
{
r: 50,
c: 12
},
{
r: 150,
c: 12
},
{
r: 300,
c: 12
},
{
r: 1200,
c: 12
}
], x, y, centerX = clickPosition[0], centerY = clickPosition[1];
vertices.push([
centerX,
centerY
]);
rings.forEach(function (ring) {
var radius = ring.r, count = ring.c, variance = radius * 0.25;
for (var i = 0; i < count; i++) {
if (window.CP.shouldStopExecution(2)) {
break;
}
x = Math.cos(i / count * TWO_PI) * radius + centerX + randomRange(-variance, variance);
y = Math.sin(i / count * TWO_PI) * radius + centerY + randomRange(-variance, variance);
vertices.push([
x,
y
]);
}
window.CP.exitedLoop(2);
});
vertices.forEach(function (v) {
v[0] = clamp(v[0], 0, imageWidth);
v[1] = clamp(v[1], 0, imageHeight);
});
indices = Delaunay.triangulate(vertices);
}
function shatter() {
var p0, p1, p2, fragment;
var tl0 = new TimelineMax({ onComplete: shatterCompleteHandler });
for (var i = 0; i < indices.length; i += 3) {
if (window.CP.shouldStopExecution(3)) {
break;
}
p0 = vertices[indices[i + 0]];
p1 = vertices[indices[i + 1]];
p2 = vertices[indices[i + 2]];
fragment = new Fragment(p0, p1, p2);
var dx = fragment.centroid[0] - clickPosition[0], dy = fragment.centroid[1] - clickPosition[1], d = Math.sqrt(dx * dx + dy * dy), rx = 300 * sign(dy), ry = 900 * -sign(dx), delay = d * 0.003 * randomRange(0.1, 0.25);
fragment.canvas.style.zIndex = Math.floor(d).toString();
var tl1 = new TimelineMax();
tl1.to(fragment.canvas, randomRange(0.25, 1), {
z: randomRange(-1500, 1500),
rotationX: rx,
rotationY: ry,
x: randomRange(-2000, 2000),
y: randomRange(-2000, 2000),
ease: Expo.easeIn
});
tl1.to(fragment.canvas, 0.4, { alpha: 0 }, 0.6);
tl0.insert(tl1, delay);
fragments.push(fragment);
container.appendChild(fragment.canvas);
}
window.CP.exitedLoop(3);
container.removeChild(image);
image.removeEventListener('click', imageClickHandler);
}
function shatterCompleteHandler() {
fragments.forEach(function (f) {
container.removeChild(f.canvas);
});
fragments.length = 0;
vertices.length = 0;
indices.length = 0;
placeImage();
}
function randomRange(min, max) {
return min + (max - min) * Math.random();
}
function clamp(x, min, max) {
return x < min ? min : x > max ? max : x;
}
function sign(x) {
return x < 0 ? -1 : 1;
}
Fragment = function (v0, v1, v2) {
this.v0 = v0;
this.v1 = v1;
this.v2 = v2;
this.computeBoundingBox();
this.computeCentroid();
this.createCanvas();
this.clip();
};
Fragment.prototype = {
computeBoundingBox: function () {
var xMin = Math.min(this.v0[0], this.v1[0], this.v2[0]), xMax = Math.max(this.v0[0], this.v1[0], this.v2[0]), yMin = Math.min(this.v0[1], this.v1[1], this.v2[1]), yMax = Math.max(this.v0[1], this.v1[1], this.v2[1]);
this.box = {
x: xMin,
y: yMin,
w: xMax - xMin,
h: yMax - yMin
};
},
computeCentroid: function () {
var x = (this.v0[0] + this.v1[0] + this.v2[0]) / 3, y = (this.v0[1] + this.v1[1] + this.v2[1]) / 3;
this.centroid = [
x,
y
];
},
createCanvas: function () {
this.canvas = document.createElement('canvas');
this.canvas.width = this.box.w;
this.canvas.height = this.box.h;
this.canvas.style.width = this.box.w + 'px';
this.canvas.style.height = this.box.h + 'px';
this.canvas.style.left = this.box.x + 'px';
this.canvas.style.top = this.box.y + 'px';
this.ctx = this.canvas.getContext('2d');
},
clip: function () {
this.ctx.translate(-this.box.x, -this.box.y);
this.ctx.beginPath();
this.ctx.moveTo(this.v0[0], this.v0[1]);
this.ctx.lineTo(this.v1[0], this.v1[1]);
this.ctx.lineTo(this.v2[0], this.v2[1]);
this.ctx.closePath();
this.ctx.clip();
this.ctx.drawImage(image, 0, 0);
}
};
</script>
<!-- 代碼部分end -->
</body>
</html>
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