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canvas-2lineJoin.html

2015-11-19 17:28 447 查看

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<body>
<canvas id="canvas" style="margin:0 auto;">
The current browser does not support Canvas, can replace the browser a try!
</canvas>

<script>

window.onload = function(){
var canvas = document.getElementById('canvas');

canvas.width = 1024;
canvas.height = 768;

if(canvas.getContext('2d')){
var context = canvas.getContext('2d');

context.lineWidth = 10;

// context.lineJoin="bevel" ;

// context.lineJoin="round" ;

context.lineJoin="miter" ;
context.miterLimit = 30

drawStar(context,20,300,400,400,00)

}else{
alert('当前游览器不支持Canvas，请更换游览器后再试！');
}
}

// x,y是偏移量 rot 偏移量
function drawStar(cxt,r,R,x,y,rot){
cxt.beginPath();
for(var i=0;i<5;i++){
//假设大圆内径300
cxt.lineTo(Math.cos( (18+i*72 - rot) / 180 * Math.PI )*R+x,
-Math.sin( (18+i*72 - rot) / 180 * Math.PI )*R+y);
//假设小圆内径150
cxt.lineTo(Math.cos( (54+i*72 - rot) / 180 * Math.PI )*r+x,
-Math.sin( (54+i*72 - rot) / 180 * Math.PI )*r+y);
}
cxt.closePath();
cxt.stroke();
}
</script>
</body>
<script>
/*总结
lineJoin

miter(default)

bevel

round
*/
</script>
</html>

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