<!DOCTYPE html> <html> <head lang="en"> <meta charset="UTF-8"> <title></title> <style> * { margin: 0; padding: 0; } html, body { width: 100%; height: 100%; background-color: black; overflow: hidden; } </style> </head> <body> <canvas></canvas> <script> var canvas = document.getElementById("canvas"); canvas.width = window.innerWidth; canvas.height = window.innerHeight; var content2d = canvas.getContext("2d"); var balls = []; //存储对象 //小球的基本属性 function ball() { this.x = null; this.y = null; this.angle = null; this.vx=null; this.vy=null; this.r = null; this.color = null; this.init = function (x, y) { //初始化属性值 this.x = x; this.y = y; //随机角度 this.angle = Math.random() * Math.PI * 2; //随机小球的大小 this.r = this.randomNum(10,25); this.vx=(this.randomNum(6,12)+Math.random()*0.5)*Math.cos(this.angle); this.vy=(this.randomNum(6,12)+Math.random()*0.5)*Math.sin(this.angle); this.color = this.randomColor(); }; //随机小球颜色 this.randomColor = function () { return "#" + parseInt(Math.random() * 16777216).toString(16); }; //随机大小 this.randomNum = function (min, max) { return Math.random() * max + min; }; //重绘时需移动 this.move=function(){ this.x+=this.vx; this.y+=this.vy; this.r-=0.3; this.vx*=0.93; this.vy*=0.93; } } //创建小球 function createBall(x, y) { var count = parseInt(Math.random() * 30 + 10); for (var i = 0; i < count; i++) { var b = new ball(); b.init(x, y); balls.push(b); } } //画小球 function Draw(){ for(var i=0;i<balls.length;i++){ var circle=balls[i]; circle.move(); content2d.beginPath(); content2d.fillStyle=circle.color; content2d.arc(circle.x,circle.y,circle.r,0,Math.PI*2); content2d.fill(); content2d.closePath(); } } //移除小球 function removeBall(){ for(var i=0;i<balls.length;i++){ var circle=balls[i]; if(circle.r<0.3){ balls.splice(i,1); i--; } } } //计时器，即重绘 loop(); function loop(){ //清除整个canvas content2d.clearRect(0,0,canvas.width,canvas.height); Draw(); removeBall(); window.requestAnimationFrame(loop); } canvas.onmouseup = function (e) { var x = e.pageX; var y = e.pageY; createBall(x, y); } </script> </body> </html>
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