canvas实现图片万花筒变换动画效果代码-html代码-BFW代码库

canvas实现图片万花筒变换动画效果代码

代码语言：html

所属分类：动画

代码描述：canvas实现图片万花筒变换动画效果代码，可调参数

下面为部分代码预览，完整代码请点击下载或在bfwstudio webide中打开

<!DOCTYPE html>
<html lang="en" >

<head>
  <meta charset="UTF-8">

  
  
</head>

<body translate="no">
  
  
      <script  >
var doc = document,
win = window,
body = doc.body;

var ww = win.innerWidth,
wh = win.innerHeight;

var c = doc.createElement('canvas'),
ctx = c.getContext('2d');

var half_PI = Math.PI / 2,
two_PI = Math.PI * 2,
ease = 0.01;


var k = {
  offsetRotation: 0,
  offsetScale: 0.8,
  offsetX: 0,
  offsetY: 0,
  radius: 1100,
  slices: 24,
  zoom: 1.5 };


body.appendChild(c);
c.width = k.radius * 2;
c.height = k.radius * 2;

var img = new Image();
img.crossOrigin = "Anonymous"; // This allows the image to be used with canvas (necessary for some external images)
img.onload = function () {
  var fill = ctx.createPattern(img, 'repeat');

  var scale, step, cx;

  scale = k.zoom * (k.radius / Math.min(img.width, img.height));
  step = two_PI / k.slices;
  cx = img.width / 2;

  function draw() {
    ctx.clearRect(0, 0, c.width, c.height); // Clear canvas before drawing each frame
    ctx.fillStyle = fill;

    for (var i = 0; i <= k.slices; i++) {
      ctx.save();
      ctx.translate(k.radius, k.radius);
      ctx.rotate(i * step);
      ctx.beginPath();
      ctx.moveTo(-0.5, -0.5);
      ct.........完整代码请登录后点击上方下载按钮下载查看