代码片段 1
- <!DOCTYPE html PUBLIC"-//W3C//DTD XHTML 1.0 Transitional//EN""http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
- <html xmlns="http://www.w3.org/1999/xhtml">
- <head>
- <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
- <title>
简单的气泡效果
- </title>
- <style type="text/CSS">
- body{background-color:#000000;margin:0px;overflow:hidden}
- </style>
- </head>
- <body>
- </body>
- </html>
- <script>
- var canvas = document.createElement('canvas'),
- context = canvas.getContext('2d'),
- windowW = window.screen.width,
- windowH = window.screen.height,
- Mx,
- My,
- paused = true;
- suzu = [];
- booms = [];
- boomks = [];
- start();
- canvas.onmousemove = function(e) {
- var loc = canvasMove(e.clientX, e.clientY);
- Mx = loc.x;
- My = loc.y
- };
- canvas.onmousedown = function() {
- creatarry(Mx, My);
- paused = !paused
- };
- function creatarry(a, b) {
- for (var i = 0; i < 40; ++i) {
- booms[i] = {
- x: a,
- y: b,
- gravity: 0.3,
- speedX: Math.random() * 20 - 10,
- speedY: Math.random() * 15 - 7,
- radius: Math.random() * 15,
- color: Math.random() * 360,
- apc: 0.6
- };
- boomks.push(booms[i]);
- if (boomks.length > 300) {
- boomks.shift()
- };
- console.log(boomks)
- }
- };
- function loop1() {
- boomks.forEach(function(circle) {
- context.beginPath();
- context.arc(circle.x, circle.y, circle.radius, 0, Math.PI * 2, false);
- context.fillStyle = 'hsla(' + circle.color + ',100%,60%,' + circle.apc + ')';
- context.fill();
- movecircles(circle)
- })
- }
- function movecircles(circle) {
- circle.x += circle.speedX;
- circle.speedY += circle.gravity;
- circle.y += circle.speedY;
- circle.apc -= 0.008
- }
- function canvasMove(x, y) {
- var bbox = canvas.getBoundingClientRect();
- return {
- x: x - bbox.left * (canvas.width / bbox.width),
- y: y - bbox.top * (canvas.height / bbox.height)
- }
- };
- function start() {
- document.body.appendChild(canvas);
- canvas.width = windowW;
- canvas.height = windowH;
- setInterval(fang, 25)
- }
- function fang() {
- context.clearRect(0, 0, canvas.width, canvas.height);
- loop1();
- loop()
- }
- function loop() {
- var circle = new createCircle(Mx, My);
- suzu.push(circle);
- for (i = 0; i < suzu.length; i++) {
- var ss = suzu[i];
- ss.render(context);
- ss.update()
- }
- if (suzu.length > 1000) {
- suzu.shift()
- }
- }
- function createCircle(x, y) {
- this.x = x;
- this.y = y;
- this.color = Math.random() * 360;
- this.radius = Math.random() * 25;
- this.xVel = Math.random() * 5 - 2;
- this.apc = 0.6;
- this.gravity = 0.07;
- this.yVel = Math.random() * 10 - 3;
- this.render = function(c) {
- c.beginPath();
- c.arc(this.x, this.y, this.radius, 0, Math.PI * 2, true);
- c.fillStyle = 'hsla(' + this.color + ',100%,60%,' + this.apc + ')';
- c.fill()
- };
- this.update = function() {
- if (!paused) {
- this.yVel += this.gravity;
- this.y += this.yVel
- } else {
- this.y -= 5
- }
- this.x += this.xVel;
- this.apc -= 0.01;
- if (this.radius > 1) {
- this.radius -= 0.4
- }
- }
- }
- </script>
来源: http://www.qdfuns.com/article/17515/6942059eafd8898deca21c6e1caa552f.html