为什么就显示边框
慕粉3384580
2016-05-24 21:41
<DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<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:"#67bcef"},
{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"}
];
function draw(id) {
var canvas = document.getElementById(id);
if (canvas == null) {
return false;
}
var context = canvas.getContext("2d");
for(var i=0;i<tangram.length;i++) {
draw(tangram[i], context);
}
}
function draw(piece,cxt) {
var cxt=canvas.getContext("2d");
cxt.beginPath();
cxt.moveTo(piece.p[0].x,piece.p[0].y);
for(var i=0;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>
</head>
<body onload="draw('canvas')">
<canvas id="canvas" width="800" height="800"
style="border:1px solid #aaa;
diaplay:block;
margin:50px auto;">
</canvas>
</body>
</html>
2回答
-
- Dling
- 2016-05-25 09:44:47
function draw(id)
function draw(piece,cxt)
为什么会有两个draw()函数？
把draw(id) 改个名字就出来了 drawCanvas(id)
function drawCanvas(id)
<body onload="drawCanvas('canvas')"> -
- 慕粉3384580
- 2016-05-25 19:57:35
非常感谢 效果出来了
炫丽的倒计时效果Canvas绘图与动画基础
96921 学习 · 1029 问题
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