HTML5 circular wave loading animation special effects
HTML5 circular wave loading animation special effects
HTML5 circular wave loading animation special effect is a native HTML5+css3+canvas wave rolling rising loading animation with circular loading container effect.
var wave = (function () {
var ctx;var waveImage;
var canvasWidth;
var canvasHeight;
var needAnimate = false;
function init (callback) {
var wave = document.getElementById('wave');
var canvas = document.createElement('canvas');
if (!canvas.getContext) return;
ctx = canvas.getContext('2d');
canvasWidth = wave.offsetWidth;
canvasHeight = wave.offsetHeight;
canvas.setAttribute('width', canvasWidth);
canvas.setAttribute('height', canvasHeight);
wave.appendChild(canvas);
waveImage = new Image();
waveImage.onload = function () {
waveImage.onload = null;
callback();
}
waveImage.src = 'images/wave.png';
}
function animate () {
var waveX = 0;
var waveY = 0;
var waveX_min = -203;
var waveY_max = canvasHeight * 0.7;
var requestAnimationFrame =
window.requestAnimationFrame ||
window.mozRequestAnimationFrame ||
window.webkitRequestAnimationFrame ||
window.msRequestAnimationFrame ||
function (callback) { window.setTimeout(callback, 1000 / 60); };
function loop () {
ctx.clearRect(0, 0, canvasWidth, canvasHeight);
if (!needAnimate) return;
if (waveY < waveY_max) waveY += 1.5;
if (waveX < waveX_min) waveX = 0; else waveX -= 3;
ctx.globalCompositeOperation = 'source-over';
ctx.beginPath();
ctx.arc(canvasWidth/2, canvasHeight/2, canvasHeight/2, 0, Math.PI*2, true);
ctx.closePath();
ctx.fill();
ctx.globalCompositeOperation = 'source-in';
ctx.drawImage(waveImage, waveX, canvasHeight - waveY);
requestAnimationFrame(loop);
}
loop();
}
function start () {
if (!ctx) return init(start);
needAnimate = true;
setTimeout(function () {
if (needAnimate) animate();
}, 500);
}
function stop () {
needAnimate = false;
}
return {start: start, stop: stop};
}());
wave.start();
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