怎样用canvas来绘制彩色七巧板-9543建站博客

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怎样用canvas来绘制彩色七巧板

这次给大家带来怎样用canvas来绘制彩色七巧板，用canvas来绘制彩色七巧板的注意事项有哪些，下面就是实战案例，一起来看一下。

HTML代码

<!DOCTYPE html><html lang="en"><head>    <meta charset="UTF-8"/>    <title>Canvas绘制七巧板</title></head>    <body>        <style>            #canvas{        border: 1px solid #aaa;        text-align: center;}        </style>        <canvas id="canvas" width="800" height="800">            当用户浏览器不支持Canvas,请更换浏览器重试！        </canvas>    </body></html>

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js代码如下所示：

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: "#f6ca29"}];//七巧板的七块图形，p为各顶点坐标，color为颜色window.onload = function () {    var canvas = document.getElementById("canvas");    if (canvas.getContext("2d")) {//判断浏览器是否支持canvas        var context = canvas.getContext("2d");        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 = 5;            cxt.stroke();        }    } else {        alert("不支持canvas,请更换浏览器！")    }};

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