canvas绘制万花筒效果(代码分享)

来源:转载

话不多说,请看代码:

<!doctype html><html><head><meta charset="utf-8"><title>万花筒</title><style>canvas{ background:#eee; }</style><script>window.onload = function(){ var canvas = document.getElementById("canvas"); var cobj = canvas.getContext("2d"); var arr = []; var t=setInterval(function(){ cobj.clearRect(0,0,600,600); for(var i=0;i<arr.length;i++){ cobj.save(); cobj.translate(300,300); cobj.scale(arr[i].scales,arr[i].scales); cobj.rotate(arr[i].angle*Math.PI/180); cobj.fillStyle = arr[i].color; cobj.fillRect(arr[i].num,arr[i].num,30,30); cobj.restore(); } },50); setInterval(function(){ for(var i=0;i<arr.length;i++){ if(arr[i].num<=0){ arr.splice(i,1); continue; } arr[i].angle+=2; arr[i].num-=0.2; arr[i].scales-=0.002; if(arr[i].scales<=0.2){ arr[i].scales=0.2; } } },50); setInterval(function(){ var rect = {angle:0,num:150,scales:1,color:"rgb("+parseInt(Math.random()*255)+","+parseInt(Math.random()*255)+","+parseInt(Math.random()*255)+")"}; arr.push(rect); },600); }</script></head><body><canvas width="600" height="600" id="canvas"></canvas></body></html>

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