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使用JS實現氣泡跟隨滑鼠移動動畫特效實例詳解

巴扎黑原創: 2017-09-18 09:41:511961瀏覽

氣泡跟隨滑鼠移動，並在每次點擊時產生不同的變化，效果非常迷人，下面小編給大家帶來了，基於js實現的氣泡效果實例代碼，需要的朋友參考下吧

氣泡跟隨滑鼠移動，並在每次點擊時產生不同的變化

#效果如下

<!DOCTYPE html>
<html lang="en">
 <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(&#39;canvas&#39;),
 context = canvas.getContext(&#39;2d&#39;),
 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 = &#39;hsla(&#39; + circle.color + &#39;,100%,60%,&#39; + circle.apc + &#39;)&#39;;
 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 = &#39;hsla(&#39; + this.color + &#39;,100%,60%,&#39; + this.apc + &#39;)&#39;;
 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>

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