Bug 17954

Summary: Canvas arc() with radius of 0 throws exception
Product: WebKit Reporter: John Resig <jresig>
Component: HTML DOMAssignee: Nobody <webkit-unassigned>
Status: RESOLVED FIXED    
Severity: Normal CC: oliver
Priority: P2 Keywords: HasReduction, InRadar, ReviewedForRadar
Version: 528+ (Nightly build)   
Hardware: All   
OS: All   
URL: http://ejohn.org/files/bugs/arc/

Description John Resig 2008-03-19 12:08:40 PDT
See the following reduction:
http://ejohn.org/files/bugs/arc/

Which throws the following error:
Error: INDEX_SIZE_ERR: DOM Exception 1
http://ejohn.org/files/bugs/arc/ (line 5)

According to the canvas spec:
http://www.whatwg.org/specs/web-apps/current-work/multipage/section-the-canvas.html

"Negative values for radius must cause the implementation to raise an INDEX_SIZE_ERR exception."

However, that is not the case for arcs with a radius of 0.
Comment 1 John Resig 2008-03-19 12:12:47 PDT
For posterity, here's the reduction:

<canvas width="100" height="100" id="canvas"></canvas>
<script>window.onload = function(){
var c = document.getElementsByTagName("canvas")[0];
var context = c.getContext("2d");
context.arc( 10, 10, 0, 0, 180, false );
};</script>
Comment 2 Mark Rowe (bdash) 2008-03-19 13:11:34 PDT
<rdar://problem/5808318>
Comment 3 Oliver Hunt 2008-03-19 15:29:11 PDT
Landed r31162