Hi Ian,
Yeah, that's why the spec hand-waves to transform the line too... but I
agree that that doesn't really work.
Do you have any suggestion of how to spec this better?
This is the most general arcTo situation:
setTransform(M0)
lineTo(x0, y0)
setTransform(M)
arcTo(x1, y1,
On Mon, Sep 3, 2012 at 8:58 AM, Ian Hickson i...@hixie.ch wrote:
Does it work if you just transform all the points and the line?
(Yeah, that's still way too vague. I'm not sure how to really specify
this in a manner that's both unambiguous and clear. Any suggestions?)
I am not 100% sure that
On Mon, 20 Aug 2012, Michael Day wrote:
The camvas arcTo method generates an arc that touches two tangent lines.
The first tangent line is from the last point in the previous subpath to
the first point passed to the arcTo method.
What happens in this situation:
ctx.lineTo(100, 100);
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);
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
Hi,
The camvas arcTo method generates an arc that touches two tangent lines.
The first tangent line is from the last point in the previous subpath to
the first point passed to the arcTo method.
What happens in this situation:
ctx.lineTo(100, 100);
ctx.scale(2, 1);
ctx.arcTo(100, 100, 100,
Firefox and Chrome do not do this, as can be seen by viewing the
attached HTML file.
Or since attachments are stripped, here is the file:
http://www.princexml.com/arcto.html
Cheers,
Michael
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