HTML5点击按钮水波扩散动画效果

HTML5点击按钮水波扩散动画效果1382
HTML5实现点击水波扩散效果是一款基于HTML5 Canvas的动画按钮,每一个按钮都是一个canvas画布,这就很灵活,你可以在canvas绘制任意你喜欢的东西作为按钮的背景画面,并且,还可以有动画特效。
var canvas = {},
    centerX = 0,
    centerY = 0,
    color = '',
    containers = document.getElementsByClassName('material-design')
    context = {},
    element = {},
    radius = 0,

    requestAnimFrame = function () {
      return (
        window.requestAnimationFrame       || 
        window.mozRequestAnimationFrame    || 
        window.oRequestAnimationFrame      || 
        window.msRequestAnimationFrame     || 
        function (callback) {
          window.setTimeout(callback, 1000 / 60);
        }
      );
    } (),
      
    init = function () {
      containers = Array.prototype.slice.call(containers);
      for (var i = 0; i < containers.length; i += 1) {
        canvas = document.Element('canvas');
        canvas.addEventListener('click', press, false);
        containers[i].appendChild(canvas);
        canvas.style.width ='100%';
        canvas.style.height='100%';
        canvas.width  = canvas.offsetWidth;
        canvas.height = canvas.offsetHeight;
      }
    },
      
    press = function (event) {
      color = event.toElement.parentElement.dataset.color;
      element = event.toElement;
      context = element.getContext('2d');
      radius = 0;
      centerX = event.offsetX;
      centerY = event.offsetY;
      context.clearRect(0, 0, element.width, element.height);
      draw();
    },
      
    draw = function () {
      context.beginPath();
      context.arc(centerX, centerY, radius, 0, 2 * Math.PI, false);
      context.fillStyle = color;
      context.fill();
      radius += 2;
      if (radius < element.width) {
        requestAnimFrame(draw);
      }
    };

init();

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