Upstream bug is still open but reporter said issue was fixed in Firefox
57.0.4 over a year ago. Test file works here with Firefox 66.0.2 in
Ubuntu 18.04 so closing as fixed.
** Changed in: firefox (Ubuntu)
Status: Confirmed => Fix Released
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https://bugs.launchpad.net/bugs/1434404
Title:
Canvas path rendering bug
Status in Mozilla Firefox:
Confirmed
Status in firefox package in Ubuntu:
Fix Released
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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