没有用啊，照着视频吵，没反应 http://www.imooc.com/video/2435
慕少5156214
2017-08-02 20:24
canvas写七巧板，没用啊
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
<canvas id="canvas" width="800" height="800" style="border: 1px solid #262626;display: block;margin:50px auto;">
当前浏览器不支持canvas</canvas>
<script>
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"}
]
window.onload =function(){
var canvas=document.getElementById("canvas");
var comtext=canvas.getContext("2d");
for(var i=0;i<tangram.length; i ++)
draw(tangram[i],comtext)
}
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();
}
</script>
</body>
</html>
3回答
-
- 慕后端7315724
- 2019-01-16 01:25:38
是context 你写的comtext
-
- 飘移的鼻毛
- 2017-08-09 10:51:06
draw方法下的for循环写错了，这个循环里面只包含 cxt.lineTo(piece.p[i].x,piece.p[i].y); 这一段代码
-
- _易
- 2017-08-03 00:05:44
大哥，你这代码有两个问题：
1、draw方法中的for循环后面多了一个分号；
2、closePath应该在这个多边形绘制成功后才使用的，所以，closePath要移动到for循环的外面才行。
炫丽的倒计时效果Canvas绘图与动画基础
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