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  • canvas-tangram.html

    <!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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  • 原文地址:https://www.cnblogs.com/cynthia-wuqian/p/4978314.html
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