应用HTML5 Canvas制作酷炫科技背景动画特效
更多特效代码请添加HTML5前端交流群111645711
看这性感的线条，激情的律动！
废话不多说，上代码！
源代码
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.aaa-cg.com.cn?lcc">
<html xmlns="http://www.aaa-cg.com.cn?lcc">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>需要文档版本源码，可以加我的HTML5前端交流群111645711</title>
<style>
* {
margin:0;
padding:0;
}
body {
font-size:16px;
font:400 16px/1.62 Georgia,"Xin Gothic","Hiragino Sans GB","Droid Sans Fallback","Microsoft YaHei",sans-serif;font-family: "PT serif",微軟正黑體,微软雅黑,华文细黑,Microsoft Yahei,Hiragino Sans GB,sans-serif;
color:#D0CCCC;
overflow:hidden;
text-shadow: 0px 0px 1px rgba(24, 22, 22, 0.35);
background-color: #000;
}
</style>
</head>
<body><script src="/demos/googlegg.js"></script>
<canvas height="100%" width="100%" style="position: fixed; top: 0px; left: 0px; z-index: -1; opacity: 1;" id="canvas"></canvas>
<script>
var canvas,
ctx,
width,
height,
size,
lines,
tick;
function line() {
this.path = [];
this.speed = rand(10, 20);
this.count = randInt(10, 30);
this.x = width / 2, +1;
this.y = height / 2 + 1;
this.target = {
x: width / 2,
y: height / 2
};
this.dist = 0;
this.angle = 0;
this.hue = tick / 5;
this.life = 1;
this.updateAngle();
this.updateDist();
}
line.prototype.step = function(i) {
this.x += Math.cos(this.angle) * this.speed;
this.y += Math.sin(this.angle) * this.speed;
this.updateDist();
if (this.dist < this.speed) {
this.x = this.target.x;
this.y = this.target.y;
this.changeTarget();
}
this.path.push({
x: this.x,
y: this.y
});
if (this.path.length > this.count) {
this.path.shift();
}
this.life -= 0.001;
if (this.life <= 0) {
this.path = null;
lines.splice(i, 1);
}
};
line.prototype.updateDist = function() {
var dx = this.target.x - this.x,
dy = this.target.y - this.y;
this.dist = Math.sqrt(dx * dx + dy * dy);
}
line.prototype.updateAngle = function() {
var dx = this.target.x - this.x,
dy = this.target.y - this.y;
this.angle = Math.atan2(dy, dx);
}
line.prototype.changeTarget = function() {
var randStart = randInt(0, 3);
switch (randStart) {
case 0: // up
this.target.y = this.y - size;
break;
case 1: // right
this.target.x = this.x + size;
break;
case 2: // down
this.target.y = this.y + size;
break;
case 3: // left
this.target.x = this.x - size;
}
this.updateAngle();
};
line.prototype.draw = function(i) {
ctx.beginPath();
var rando = rand(0, 10);
for (var j = 0, length = this.path.length; j < length; j++) {
ctx[(j === 0) ? "moveTo" : "lineTo"](this.path[j].x + rand(-rando, rando), this.path[j].y + rand(-rando, rando));
}
ctx.strokeStyle = "hsla(" + rand(this.hue, this.hue + 30) + ", 80%, 55%, " + (this.life / 3) + ")";
ctx.lineWidth = rand(0.1, 2);
ctx.stroke();
};
function rand(min, max) {
return Math.random() * (max - min) + min;
}
function randInt(min, max) {
return Math.floor(min + Math.random() * (max - min + 1));
};
function init() {
canvas = document.getElementById("canvas");
ctx = canvas.getContext("2d");
size = 30;
lines = [];
reset();
loop();
}
function reset() {
width = Math.ceil(window.innerWidth / 2) * 2;
height = Math.ceil(window.innerHeight / 2) * 2;
tick = 0;
lines.length = 0;
canvas.width = width;
canvas.height = height;
}
function create() {
if (tick % 10 === 0) {
lines.push(new line());
}
}
function step() {
var i = lines.length;
while (i--) {
lines[i].step(i);
}
}
function clear() {
ctx.globalCompositeOperation = "destination-out";
ctx.fillStyle = "hsla(0, 0%, 0%, 0.1";
ctx.fillRect(0, 0, width, height);
ctx.globalCompositeOperation = "lighter";
}
function draw() {
ctx.save();
ctx.translate(width / 2, height / 2);
ctx.rotate(tick * 0.001);
var scale = 0.8 + Math.cos(tick * 0.02) * 0.2;
ctx.scale(scale, scale);
ctx.translate(-width / 2, -height / 2);
var i = lines.length;
while (i--) {
lines[i].draw(i);
}
ctx.restore();
}
function loop() {
requestAnimationFrame(loop);
create();
step();
clear();
draw();
tick++;
}
function onresize() {
reset();
}
window.addEventListener("resize", onresize);
init();
</script>
<div style="text-align:center;margin:50px 0; font:normal 14px/24px "MicroSoft YaHei";">
<p>适用浏览器：360、FireFox、Chrome、Opera、傲游、搜狗、世界之窗. 不支持Safari、IE8及以下浏览器。</p>
<p>来源：<a href="http://www.aaa-cg.com.cn?lcc" target="_blank">素材</a></p>
</div>
</body>
</html>
