canvas-tangram.html_html/css_WEB-ITnose-HTML Tutorial-php.cn

canvas-tangram.html_html/css_WEB-ITnose
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Release： 2016-06-24 11:33:20
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<!DOCTYPE html><html lang="en"><head>    <meta charset="UTF-8">    <title>Document</title></head><body>    <canvas id="canvas" style="border: 1px #ddd solid;display: block;margin:0 auto"></canvas>    <script>        var tangram = [            {p:[{x:0,y:0},{x:800,y:0},{x:400,y:400}],color:"red"},            {p:[{x:0,y:0},{x:400,y:400},{x:0,y:800}],color:"blue"},            {p:[{x:800,y:0},{x:800,y:400},{x:600,y:600},{x:600,y:200}],color:"yellow"},            {p:[{x:600,y:200},{x:600,y:600},{x:400,y:400}],color:"green"},            {p:[{x:400,y:400},{x:600,y:600},{x:400,y:800},{x:200,y:600}],color:"pink"},            {p:[{x:200,y:600},{x:0,y:800},{x:400,y:800}],color:"orange"},            {p:[{x:800,y:400},{x:800,y:800},{x:400,y:800}],color:"purple"}        ];        function draw(piece,cxt){            cxt.beginPath();            cxt.moveTo(piece.p[0].x , piece.p[0].y);            for(var i=1;i<piece.p.length;i++){                cxt.lineTo(piece.p[i].x , piece.p[i].y);            }            cxt.closePath();            cxt.fillStyle = piece.color;            cxt.fill();        }        window.onload = function(){            var canvas = document.getElementById('canvas');            canvas.width = 800;            canvas.height = 800;            if(canvas.getContext('2d')){                var context = canvas.getContext('2d');                for(var i=0;i<tangram.length;i++){                    draw(tangram[i],context)                }                            }else{                alert('当前游览器不支持Canvas，请更换游览器后再试！');            }        }    </script></body><script>/*  总结 绘制七巧板  主要运用的js的for循环的巧妙  1.定义路径 trangram  2.第一层for，循环trangram[i]  3.函数draw,第二层for，循环取出绘制路径 trangram.p[i].x */</script></html>
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