纯HTML5绘制的七巧板

2024年5月25日 246次阅读 来源: trigkit4

纯HTML5绘制的七巧板

   <!DOCTYPE HTML>
    <html lang="en-US">
    <head>
        <meta charset="UTF-8">
        <title></title>
    </head>
    <body>
        <canvas id="canvas" style = "border:1px solid #aaa;display:block;margin:50px auto;">
</canvas>
        <script type="text/javascript">
            var tangram = [
                {p:[{x:0,y:0},{x:800,y:0},{x:400,y:400}],color:"#caff67"},
                {p:[{x:0,y:0},{x:400,y:400},{x:0,y:800}],color:"#67becf"},
                {p:[{x:800,y:0},{x:800,y:400},{x:600,y:600},{x:600,y:200}],color:"#ef3d61"},
                {p:[{x:600,y:200},{x:600,y:600},{x:400,y:400}],color:"#f9f51a"},
                {p:[{x:400,y:400},{x:600,y:600},{x:400,y:800},{x:200,y:600}],color:"#a594c0"},
                {p:[{x:200,y:600},{x:400,y:800},{x:0,y:800}],color:"#fa8ecc"},
                {p:[{x:800,y:400},{x:800,y:800},{x:400,y:800}],color:"#6ca29"}
            ]   //定义每一块的顶点坐标数组
            window.onload = function(){
                var canvas = document.getElementById("canvas");
                canvas.height = 800;
                canvas.width = 800;

                var context = canvas.getContext('2d');
                for(var i =0;i<tangram.length;i++)     //使用for循环进行遍历
   draw(tangram[i],context)           //draw函数的两个参数变量tangraw和上下文环境context
            }

            function draw(piece,cxt){
                cxt.beginPath();
                cxt.moveTo(piece.p[0].x,piece.p[0].y);     //移动到顶点坐标的第一个坐标位置
                for(var i =1;i<piece.p.length;i++)
                    cxt.lineTo(piece.p[i].x,piece.p[i].y);  //绘制后续几个坐标的路径

                cxt.closePath();
                cxt.fillStyle = piece.color;
                cxt.fill();
            }
        </script>
    </body>
    </html>

点击下方result查看演示：
http://jsfiddle.net/eh02450b/1/

    原文作者：trigkit4
    原文地址: https://segmentfault.com/a/1190000000653063
    本文转自网络文章，转载此文章仅为分享知识，如有侵权，请联系博主进行删除。
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