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();