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Message #113536
[Bug 1434404] Re: Canvas path rendering bug
Thanks. I can reproduce this with Firefox 37.0.1. Can you report the
bug upstream to Mozilla and link this bug report to the upstream bug
report by clicking on "Also affects project" near the top of this page?
** Tags added: trusty
** Changed in: firefox (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1434404
Title:
Canvas path rendering bug
Status in firefox package in Ubuntu:
Confirmed
Bug description:
Ubuntu: 14.04.2 LTS (32bit and 64bit versions)
Firefox: Mozilla Firefox for Ubuntu canonical - 1.0
Installed: 36.0.1+build2-0ubuntu0.14.04.1
I wrote the simple script to draw the circle composed by lines from it
center. In Ubuntu Firefox I've got some weird looking artefacts, while
in other OSes or browsers all seems to be ok (I've tested Firefox,
Opera and Chrome in Windows, Chrome and Opera in Ubuntu).
To reproduce:
-------------------
1. Open source file circle360.html in Firefox on Ubuntu;
2. Expected to see the correctly drawin picture;
3. Instead I see the picture with drawing artefacts (look at attached picture canvas-firefox.png)
Source file: circle360.html
-------------------------------------
<!DOCTYPE html>
<html>
<head>
<title>Ray Circle</title>
</head>
<body>
<canvas height='640' width='640' id='example'>You should update your browser.</canvas>
<script>
var example = document.getElementById("example"),
ctx = example.getContext('2d'),
PIdiv180 = Math.PI / 180,
size = 480;
ctx.beginPath();
for (var i = 0; i < 360; i++) {
ctx.moveTo(320, 320);
ctx.lineTo(320 + Math.sin(i * PIdiv180) * 320, 320 + Math.cos(i * PIdiv180) * 320);
}
ctx.stroke();
</script>
</body>
</html>
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References
