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怎么解决这个问题ctx.globalCompositeOperation='xor' #42

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snowcrazy opened this issue Sep 15, 2018 · 4 comments
Closed

怎么解决这个问题ctx.globalCompositeOperation='xor' #42

snowcrazy opened this issue Sep 15, 2018 · 4 comments

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@snowcrazy
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##怎么解决这个问题ctx.globalCompositeOperation='xor'啊##


<!DOCTYPE html>
<html>
<body>

<canvas id="myCanvas" width="300" height="400" style="border:1px solid #d3d3d3;">
Your browser does not support the HTML5 canvas tag.
</canvas>

<script>

var c=document.getElementById("myCanvas");
var ctx=c.getContext("2d");
ctx.globalCompositeOperation="xor";

ctx.fillStyle="red";
ctx.beginPath();
ctx.moveTo(100,60);
ctx.lineTo(160,120);
ctx.lineTo(100,180);
ctx.lineTo(40,120);
ctx.closePath();
ctx.fill();


ctx.fillStyle="bule";
ctx.beginPath();
ctx.lineTo(160,120);
ctx.lineTo(100,180);
ctx.lineTo(40,120);
ctx.closePath();
ctx.fill();


</script>

</body>
</html>

qq20180915-0
@snowcrazy
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我的代码都写好了，测试得到这个图片，有bug吧

@cy0707
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cy0707 commented Sep 15, 2018

我问的是，你的问题是什么呢，你想得到什么呢。
你就是说了一句-----我的代码都写好了，测试得到这个图片，有bug吧
正常的流程不是，表达的你的代码是什么意思，你要得到的结果是什么的图呢，为什么结果跟你图不一样。

@cy0707 cy0707 closed this as completed Sep 15, 2018
@snowcrazy
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qq20180915-2

上面就是我的代码，图片显示有斜线（应该是没有斜线），所以有bug

@snowcrazy
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你测试我的代码又发现问题了，Thanks♪(･ω･)ﾉ

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@cy0707 @snowcrazy