canvas贝济埃曲线

<!DOCTYPE html>

<html>

    <head>

        <meta charset="utf-8">

        <title></title>

        <script type="text/javascript">

            function draw(id){

                var canvas = document.getElementById(id);

                if(canvas == null){

                    return false;

                }

                var context = canvas.getContext('2d');

                context.fillStyle = "#eeeeff";

                context.fillRect(0,0,400,300);

                var dx = 150;

                var dy = 150;

                var s = 100;

                context.beginPath();

                context.globalCompositeOperation = 'and';

                context.fillStyle = 'rgb(100,255,100)';

                context.strokeStyle = 'rgb(0,0,100)';

                var x = Math.sin(0);

                var y = Math.cos(0);

                var dig = Math.PI/15*11;

                for(var i=0;i<30;i++){

                    var x = Math.sin(i*dig);

                    var y = Math.cos(i*dig);

                    context.bezierCurveTo(dx+x*s,dy+y*s-100,dx+x*s+100,dy+y*s,dx+x*s,dy+y*s);

                }

                context.closePath();

                context.fill();

                context.stroke();

            }

        </script>

    </head>

    <body onload="draw('canvas');">

        <canvas id="canvas" width="400" height="300"></canvas>

    </body>

</html>
巴特西

canvas贝济埃曲线

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