canvas绘制万花筒效果（代码分享）
程序员文章站
2022-05-31 18:10:15
话不多说，请看代码：
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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