Re: [PATCHES] Re: Harp Pedals?

[Reinhold Kainhofer]

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Am Donnerstag, 28. August 2008 schrieb Valentin Villenave:
> 2008/8/19 Carl D. Sorensen <address@hidden>:
> > I've been looking at ellipse code.  Once I can get rhythms.itely off my
> > plate (which is waiting on the beatGrouping patch, one way or the other)
> > I'll add an ellipse in place of the circle.
>
> I've been looking at a way to draw ellipses, but I've just seen you
> have pushed a much better-looking implementation than mine; I hope the
> docs will be recompiled soon so we can appreciate your nice ellipse in
> the documentation!

Yes, I saw that, too. I even generalized it to allow different paddings in X- 
and Y-direction. However, what I don't understand about the ellipse code in 
ellipse-stencil is the factor 0.707 (supposedly from sqrt(2)/2) for x-radius 
and y-radius. If that factor comes from scaling the ellipse so that it 
surrounds the stencil, then it only works for square stencils, for all other 
stencils it will be too large. As an extreme case consider a line stencil 
("box" from (0 . -1) to (0 . 1) ). The ellipse will have half-axes of length 
1.414 and 0 (without padding), so in X-direction it will overshoot by far.

For a square, of course, the ellipse will degenerate to a circle, touching all 
corners, but for stencils with other rectangular extents, the ellipse will 
not touch the corners of the bounding box any more.

Cheers,
Reinhold 


- -- 
- ------------------------------------------------------------------
Reinhold Kainhofer, Vienna University of Technology, Austria
email: address@hidden, http://reinhold.kainhofer.com/
 * Financial and Actuarial Mathematics, TU Wien, http://www.fam.tuwien.ac.at/
 * K Desktop Environment, http://www.kde.org, KOrganizer maintainer
 * Chorvereinigung "Jung-Wien", http://www.jung-wien.at/
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