Hi, I've been digging into an inconsistency between various browsers'
Canvas implementations and I think the spec might be allowing
undesirable behavior here.
The current version of the spec says
Hi Kevin,
The same artifact use to be present in Chrome not that long ago. When we
fixed it, we chose to interpret original image data as meaning the part
of the image data that is within the bounds of the of the source rectangle.
Also, it makes more sense to do it that way. I agree that the spec
Hi Kevin,
can you log a bug on this? https://www.w3.org/Bugs/Public/enter_bug.cgi
once it's in the system, we can fix the wording in the spec.
Rik
On Mon, Aug 20, 2012 at 6:38 AM, Kevin Gadd kevin.g...@gmail.com wrote:
Hi, I've been digging into an inconsistency between various browsers'
Hi Michael,
in your case, the first control point is not the same as the last point of
the subpath.
The 'scale(2,1)' set up a different coordinate system. You can rewrite your
code from this:
ctx.lineTo(100, 100);
ctx.scale(2, 1);
ctx.arcTo(100, 100, 100, 200, 100);
to this:
ctx.scale(2, 1);
On Mon, 20 Aug 2012, Rik Cabanier wrote:
can you log a bug on this?
https://www.w3.org/Bugs/Public/enter_bug.cgi once it's in the system, we
can fix the wording in the spec.
No need to file a bug; any e-mail sent to this list automatically ends up
on the list of issues to fix and will
Hi Rik,
The 'scale(2,1)' set up a different coordinate system. You can rewrite
your code from this:
ctx.lineTo(100, 100);
ctx.scale(2, 1);
ctx.arcTo(100, 100, 100, 200, 100);
to this:
ctx.scale(2, 1);
*ctx.lineTo(50, 100);*
ctx.arcTo(100, 100, 100, 200, 100);
Right,
On Mon, Aug 20, 2012 at 5:55 PM, Michael Day mike...@yeslogic.com wrote:
Hi Rik,
The 'scale(2,1)' set up a different coordinate system. You can rewrite
your code from this:
ctx.lineTo(100, 100);
ctx.scale(2, 1);
ctx.arcTo(100, 100, 100, 200, 100);
to this:
Hi Rik,
Yes, that is one way of implementing it. This is not specific to arcTo;
this happens with all drawing operators.
It is not quite the same with other drawing operators, for example:
ctx.setTransform(...T1...);
ctx.lineTo(100, 100);
ctx.setTransform(...T2...);
ctx.lineTo(100, 100);
On Mon, Aug 20, 2012 at 8:15 PM, Michael Day mike...@yeslogic.com wrote:
Hi Rik,
Yes, that is one way of implementing it. This is not specific to arcTo;
this happens with all drawing operators.
It is not quite the same with other drawing operators, for example:
Hi Rik,
Yes you can go to absolute canvas coordinates but you need to remember
that the radius is transformed too.
You cannot transform the three control points, and then generate the
arc. If you do this, you will always get circular arcs, whereas a
scale(2, 1) will produce an elliptical
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