怎样用canvas来绘制彩色七巧板

互联网 18-3-14

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>

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！")      }  };

相信看了本文案例你已经掌握了方法，更多精彩请关注php中文网其它相关文章！

怎样用canvas来绘制彩色七巧板

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