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HTML5应用:绘制一个心形应用

作者:andy0012021.10.13来源:Web前端之家浏览:12260评论:0
关键词:html5css3

HTML5应用:绘制一个心形应用。直接上DEMO。

<!DOCTYPE html>
<html>

    <head>
        <meta charset="UTF-8">
        <title>HTML5应用:绘制一个心形应用 - Web前端之家www.jiangweishan.com</title>
    </head>

    <body>
        <!--<noscript>r = a(1-sin"theta")</noscript>-->
        <canvas id="cardioid" width="600" height="600" style="background: lightblue">
            您的浏览器不支持canvas!
        </canvas>
        <script>
            var cr = document.getElementById("cardioid");
            var W = cr.width/2, H = cr.height/3, R = 150;
            var c = cr.getContext("2d");
            var G = 360, g = 0, T = Math.PI*2, t = T/G;
            c.save();
            c.translate(W, H);
            c.rotate(-T/4);
            //c.fillStyle = "red";
            while(g < G){
            c.save();//c.translate(W, H);
            c.rotate(g*t);
            c.beginPath();
            c.arc(0, -R*(1-Math.sin(++g*t)), 13, 0, 360, false);
            c.closePath();
            c.fill();
            c.restore();
            }
            c.restore();
            g = 0;
            (function draw(){
            if(g < G){
            c.save();
            c.translate(W, H);
            c.rotate(-T/4 + g*t);
            c.fillStyle = "red";
            c.beginPath();
            c.arc(0, -R*(1-Math.sin(++g*t)), 5, 0, 360, false);
            c.closePath();
            c.fill();
            c.restore();
            }
            setTimeout(draw, 1);
            })();
        </script>
    </body>

</html>


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