<!DOCTYPE html><html><head><meta charset="utf-8"><title>TweenMax不規則圖片切換特效</title><link rel="stylesheet" type="text/css" href="css/style.css" /></head><body><div id="container"> </div><script src='js/delaunay.js'></script><script src='js/TweenMax.js'></script><script> const TWO_PI = Math.PI * 2; var images = [], imageIndex = 0; var image, imageWidth = 768, imageHeight = 485; var vertices = [], indices = [], prevfrag = [], fragments = []; var margin = 50; var container = document.getElementById('container'); var clickPosition = [imageWidth * 0.5, imageHeight * 0.5]; window.onload = function() { TweenMax.set(container, {perspective:500}); // images from http://www.hdwallpapers.in var urls = [ 'images/1.jpg', 'images/2.jpg', 'images/3.jpg', 'images/4.jpg' ], image, loaded = 0; // very quick and dirty hack to load and display the first image asap images[0] = image = new Image(); image.onload = function() { if (++loaded === 1) { for (var i = 1; i < 4; i++) { images[i] = image = new Image(); image.src = urls[i]; } placeImage(); } }; image.src = urls[0];}; function placeImage(transitionIn) { image = images[imageIndex]; if (++imageIndex === images.length) imageIndex = 0; var num = Math.random(); if(num < .25) { image.direction = "left"; } else if(num < .5) { image.direction = "top"; } else if(num < .75) { image.direction = "bottom"; } else { image.direction = "right"; } container.appendChild(image); image.style.opacity = 0; if (transitionIn !== false) { triangulateIn(); }} function triangulateIn(event) { var box = image.getBoundingClientRect(), top = box.top, left = box.left; if(image.direction == "left") { clickPosition[0] = 0; clickPosition[1] = imageHeight / 2; } else if(image.direction == "top") { clickPosition[0] = imageWidth / 2; clickPosition[1] = 0; } else if(image.direction == "bottom") { clickPosition[0] = imageWidth / 2; clickPosition[1] = imageHeight; } else if(image.direction == "right") { clickPosition[0] = imageWidth; clickPosition[1] = imageHeight / 2; } triangulate(); build();} function triangulate() { for(var i = 0; i < 40; i++) { x = -margin + Math.random() * (imageWidth + margin * 2); y = -margin + Math.random() * (imageHeight + margin * 2); vertices.push([x, y]); } vertices.push([0,0]); vertices.push([imageWidth,0]); vertices.push([imageWidth, imageHeight]); vertices.push([0, imageHeight]); vertices.forEach(function(v) { v[0] = clamp(v[0], 0, imageWidth); v[1] = clamp(v[1], 0, imageHeight); }); indices = Delaunay.triangulate(vertices);} function build() { var p0, p1, p2, fragment; var tl0 = new TimelineMax({onComplete:buildCompleteHandler}); for (var i = 0; i < indices.length; i += 3) { 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 = 30 * sign(dy), ry = 90 * -sign(dx), delay = d * 0.003 * randomRange(0.9, 1.1); fragment.canvas.style.zIndex = Math.floor(d).toString(); var tl1 = new TimelineMax(); if(image.direction == "left") { rx = Math.abs(rx); ry = 0; } else if(image.direction == "top") { rx = 0; ry = Math.abs(ry); } else if(image.direction == "bottom") { rx = 0; ry = - Math.abs(ry); } else if(image.direction == "right") { rx = - Math.abs(rx); ry = 0; } tl1.from(fragment.canvas, 1, { z:-50, rotationX:rx, rotationY:ry, scaleX:0, scaleY:0, ease:Cubic.easeIn }); tl1.from(fragment.canvas, 0.4,{alpha:0}, 0.6); tl0.insert(tl1, delay); fragments.push(fragment); container.appendChild(fragment.canvas); }} function buildCompleteHandler() { // add pooling? image.style.opacity = 1; image.addEventListener('transitionend', function catchTrans() { fragments.forEach(function(f) { container.removeChild(f.canvas); }); fragments.length = 0; vertices.length = 0; indices.length = 0; placeImage(); this.removeEventListener('transitionend',catchTrans,false); }, false); } //////////////// MATH UTILS////////////// 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////////////// 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:Math.round(xMin), y:Math.round(yMin), w:Math.round(xMax - xMin), h:Math.round(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.save(); 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); this.ctx.restore(); }};//@ sourceURL=pen.js</script> <div style="text-align:center;margin:10px 0; font:normal 14px/24px 'MicroSoft YaHei';"></div></body></html>
不規則圖片的切換特效製作的代碼就是這些了，更多精彩請關注php中文網其它相關文章！
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