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index.html
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<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>HTML5 Canvas带边框的粒子动画进度条DEMO演示</title>
<script type="text/javascript" src="jquery.min.js"></script>
<script type="text/javascript" src="simplex-noise.js"></script>
<style>
body, html {
margin: 0px;
padding: 0px;
background: #fff;
}
</style>
</head>
<body>
<div style="text-align:center;clear:both;">
</div>
<canvas id="canvas"></canvas>
<script type="text/javascript">
$(function() {
var canvas = $('#canvas')[0],
ctx = canvas.getContext('2d'),
canvasW = $(document).width(),
canvasH = $(document).height();
ctx.fillStyle = 'black';
canvas.width = canvasW;
canvas.height = canvasH;
var stops = [50, 150, 160, 300, 500],
stopIndex = 0,
delay = 0,
progress = 0,
time = 0;
var loading = {
h: 50,
w: 500,
x: canvasW/2-250,
y: canvasH/2,
dx: 0,
dy: 0
}
// 噪声
var simplex = new SimplexNoise(),
simplexVal = 0,
simplexStart = 20,
rate = 2, // 控制粒子多少，值越大，粒子越多
particles = [];
drawLoading();
function drawLoading() {
ctx.globalCompositeOperation = 'source-over';
// 必要的
ctx.fillStyle = 'rgba(0,0,0,0.5)';
ctx.fillRect(0, 0, canvasW, canvasH);
// 进度条框
ctx.fillStyle = '#000';
ctx.fillRect(canvasW/2-250, loading.y, 500, loading.h);
ctx.strokeStyle = 'rgba(0,255,0,.5)';
ctx.strokeRect(canvasW/2-250, loading.y, 500, loading.h);
ctx.stroke();
// 进度线
ctx.fillStyle = '#0f0';
ctx.fillRect(loading.x, loading.y, 1, loading.h);
// 进度百分比
ctx.font = '20px Arial';
ctx.fillText(Math.floor(progress/5)+'%', canvasW/2-20, canvasH/2 + 30);
ctx.save();
if (stops[stopIndex] === progress) {
stopIndex++;
delay = 50;
} else {
if (delay == 0 && progress < stops[stopIndex]) {// 移动
loading.dx = -1;
loading.x += 2;
progress += 2;
} else {// 没有在移动
loading.dx = 0;
delay --;
}
}
// 画噪声点点
var i = 0;
for(i in particles) {
var p = particles[i];
if (time > p.die) {
p.o -= 0.01;
if(p.o < 0) {
particles.splice(i, 1);
}
}
p.x += p.vx;
p.y += p.vy;
p.x += p.sourcedx / 10;
p.y += p.sourcedy / 10;
if (p.simplexIndex > simplexStart){
p.simplexVal = simplex.noise3D(p.x/100, p.y/100, time/100);
}
p.simplexIndex ++;
p.x += p.simplexVal;
p.y +=p.simplexVal;
if(p.x < 0+20 || p.x > canvasW-20) {
p.vx *= -1.015;
}
if(p.y < 0+20 || p.y > canvasH-20) {
p.vy *= -1.015;
}
// ctx.globalCompositeOperation = 'copy';
ctx.beginPath();
ctx.fillStyle = 'rgba(0,255,0,'+p.o+')';
ctx.arc(p.x, p.y, p.r, 0, 2*Math.PI, true);
ctx.fill();
ctx.save();
}
if (loading.dx !== 0) { // 进度条在移动
for(i = 0; i<rate;i++){
var particle = {
x: loading.x,
y: loading.y + Math.random()*loading.h,
r: Math.random() + 0.5,
vx: (Math.random() * -2),
vy: (Math.random() - 0.5),
o: 1, //?
birth: time,
die: time + (Math.random()*50+50),
sourcedx: loading.dx,
sourcedy: loading.dy,
simplexVal: 0,
simplexIndex: 0
}
particles.push(particle);
}
}
if (progress <= loading.w) {
time ++;
window.requestAnimationFrame(drawLoading);
}
}
});
</script>
</body>
</html>