2.canvas画七巧板


<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Documenttitle>
head>
<body>
    <canvas id="canvas" width="1024" height="768" style="border:1px solid #aaa;display: block;margin: 50px auto;">

    canvas>
    <script>
        //点对象数组
        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:"#f9f51c"},
			{
      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:"#f6ca29"}
        ]
        window.onload = function(){
        //js事件网页加载好就执行
            var canvas = document.getElementById("canvas");
            canvas.width = 800;
            canvas.height = 800;
            var context = canvas.getContext("2d");
            //使用context绘制
            for(var i = 0; i < tangram.length; i++)
                draw(tangram[i], context);
        }
        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();

            cxt.strokeStyle = "black";
            cxt.lineWidth = 3;
            cxt.stroke();
        }
    script>
body>
html>

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