今天要為大家帶來一款html5 canvas實現的圖片玻璃碎片特效。圖片以玻璃碎片的形式出現到界面中，然后似玻璃被打碎的效果漸消息。效果圖如下：

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在線預覽???源碼下載

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實現代碼：

html代碼：

<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代碼：

// canvas settingsvar 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, {z: -100,ease: Cubic.easeIn,delay: 0.4});tl1.to(fragment.canvas, randomRange(1, 1.2), {rotationX: rx,rotationY: ry,z: 250,alpha: 0,ease: Cubic.easeOut});tl0.insert(tl1);fragments.push(fragment);container.appendChild(fragment.canvas);}}function randomRange(min, max) {return min + (max - min) * Math.random();}Fragment = function (v0, v1, v2, box) {this.v0 = v0;this.v1 = v1;this.v2 = v2;this.box = box;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.ctx = this.canvas.getContext('2d');TweenMax.set(this.canvas, {x: this.box.x,y: this.box.y});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);}; //@ sourceURL=pen.js View Code

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轉載于:https://www.cnblogs.com/liaohuolin/p/3965734.html

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