canvas绘制七巧板
2017-02-09 21:16:12
JavaScript
代码分享：
原文链接：http://www.qdfuns.com/notes/39573/eed05f3ecd2170228f8ff2302b28738d.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Canvas七巧板</title>
</head>
<body>
<canvas id="canvas" style=" border: 1px solid #aaa;display:block;margin:50px auto;"></canvas>
<script type="text/Javascript">
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'}
]
// 定义一个存放绘制路径和颜色的数组
window.onload=function (){
var canvas=document.getElementById('canvas');
// 获取canvas
canvas.width = 800;
canvas.height = 800;
// 定义画布的宽高
var context=canvas.getContext('2d');
// 创建画布
for( var i=0; i<tangram.length; i++){
draw(tangram[i],context);
// 遍历数组tangram执行函数draw
}
// draw这个函数
function draw(piece,cxt){
cxt.beginPath();
// 开始路径的创建
cxt.moveTo( piece.p[0].x , piece.p[0].y );
// 从这个坐标开始
for( var i=1; i<piece.p.length; i++)
// 遍历数组中的p属性
cxt.lineTo(piece.p[i].x , piece.p[i].y);
// 画路径到这个坐标
cxt.closePath();
// 关闭这条打开的路径
cxt.fillStyle = piece.color;
cxt.fill();
// 给绘制的形状填充颜色
}
}
</script>
</body>
</html>
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原文链接：http://www.qdfuns.com/notes/39573/eed05f3ecd2170228f8ff2302b28738d.html
