今天要为大家带来一款html5 canvas实现的图片玻璃碎片特效。图片以玻璃碎片的形式出现到界面中，然后似玻璃被打碎的效果渐消息。效果图如下：
源码下载
html代码：
<img src=”city_copy.jpg” id=”src_img” class=”hidden”>
<div id=”container” style=”-webkit-perspective: 500px;”>
<div>
<script src=”delaunay.js”></script>
<script src=”TweenMax.min.js”></script>
js代码：
// canvas settings
var imageWidth = 768,
imageHeight = 485;
var vertices = [],
indices,
boxes = [];
var image,
fragments = [],
container = document.getElementById(‘container’);
window.onload = function () {
image = document.getElementById(‘src_img’);
triangulate();
makeBoxes();
makeFragments();
};
function triangulate() {
var x,
y,
dx = imageWidth / 8,
dy = imageHeight / 8,
offset = 0.5;
for (var i = 0; i <= imageWidth; i += dx) {
for (var j = 0; j <= imageHeight; j += dy) {
if (i && (i !== imageWidth)) x = i + randomRange(-dx * offset, dx * offset);
else x = i;
if (j && (j !== imageHeight)) y = j + randomRange(-dy * offset, dy * offset);
else y = j;
vertices.push([x, y]);
}
}
indices = Delaunay.triangulate(vertices);
}
function makeBoxes() {
var p0, p1, p2,
xMin, xMax,
yMin, yMax;
for (var i = 0; i < indices.length; i += 3) {
p0 = vertices[indices[i + 0]];
p1 = vertices[indices[i + 1]];
p2 = vertices[indices[i + 2]];
xMin = Math.min(p0[0], p1[0], p2[0]);
xMax = Math.max(p0[0], p1[0], p2[0]);
yMin = Math.min(p0[1], p1[1], p2[1]);
yMax = Math.max(p0[1], p1[1], p2[1]);
boxes.push({
x: xMin,
y: yMin,
w: xMax – xMin,
h: yMax – yMin
});
}
}
function makeFragments() {
var p0, p1, p2,
box,
fragment;
TweenMax.set(container, { perspective: 500 });
var tl0 = new TimelineMax({ repeat: -1 });
for (var i = 0; i < indices.length; i += 3) {
p0 = vertices[indices[i + 0]];
p1 = vertices[indices[i + 1]];
p2 = vertices[indices[i + 2]];
box = boxes[i / 3];
fragment = new Fragment(p0, p1, p2, box);
var rx = randomRange(30, 60) * ((i % 2) ? 1 : -1);
var ry = randomRange(30, 60) * ((i % 2) ? -1 : 1);
var tl1 = new TimelineMax();
TweenMax.set(fragment.canvas, {
y: box.y – 1000
});
tl1.to(fragment.canvas, randomRange(0.9, 1.1), {
y: box.y,
ease: Back.easeOut
});
tl1.to(fragment.canvas, 0.5, {
