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Message #107796
[Bug 1434404] Re: Canvas path rendering bug
** Attachment added: "Image that should be (generated in Chrome)"
https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1434404/+attachment/4350547/+files/canvas-chrome.png
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https://bugs.launchpad.net/bugs/1434404
Title:
Canvas path rendering bug
Status in firefox package in Ubuntu:
New
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
