canvas雪花

<!DOCTYPE html>

<html lang="en">

<head>

    <meta charset="UTF-8">

    <title>canvas雪花</title>

</head>

<body>

<canvas id="canvas"></canvas>

<script>

    var c = document.getElementById("canvas").getContext("2d");

    c.width = window.innerWidth;

    c.height = window.innerHeight;

    var deg = Math.PI/180;

    function snowflake(c,n,x,y,len) {

        c.save();

        c.translate(x,y);

        c.moveTo(0,0);

        leg(n);

        c.rotate(-120*deg);

        leg(n);

        c.rotate(-120*deg);

        leg(n);

        c.closePath();

        c.restore();

        function leg(n) {

            c.save();

            if(n == 0){

                c.lineTo(len,0);

            }else{

                c.scale(1/3,1/3);

                leg(n-1);

                c.rotate(60*deg);

                leg(n-1);

                c.rotate(-120*deg);

                leg(n-1);

                c.rotate(60*deg);

                leg(n-1);

            }

            c.restore();

            c.translate(len,0);

        }

    }

    snowflake(c,6,115,115,125);

    c.stroke();

</script>

</body>

</html>
canvas雪花
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