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List:       kde-edu
Subject:    Re: Review Request: Set Antialiasing in Kig
From:       Maurizio Paolini <paolini () dmf ! unicatt ! it>
Date:       2012-04-14 21:17:49
Message-ID: 20120414211749.GA2699 () newton ! dmf ! unicatt ! it
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On Sat, Apr 14, 2012 at 06:40:31PM -0000, Albert Astals Cid wrote:
> I am not so sure this is wanted, antialiasing makes things thicker meaning that if \
> the line had to be 1px wide it might be wider, and for a program that tries to be \
> an exact representation of math this may not be desirable. I'd appreciate if you \
> could attach a few screenshots of various geometrical objects with and without \
> antialias so we could see the difference

Let me argue a little bit: if exactness is what we want, then 1px is just as bad as \
2px (and I think that antialiasing is not much more than 2px)... On the other hand, I \
personally often use kig to produce pictures to include in papers, and in that case \
having nice pictures is important.

Perhaps possible performance loss should be taken into account, but I have no idea of \
the impact of dealing with antialiasing.
There are interesting constructions (mainly involving fractals and that can be \
obtained mainly by using the external scripting pykig) that require the construction \
of a considerable amount of geometric objects (segments, typically, or circular arcs \
in examples involving tessellations in hyperbolic geometry) that could be tested.
I have a couple of examples in http://dmf.unicatt.it/~paolini/pykig-examples/, in \
particular

http://dmf.unicatt.it/~paolini/pykig-examples/poincare/disco/heptagonal_tessellation_disk.kpy


that can be opened with "pykig.py heptagonal_tessellation_disk.kpy" is a tessellation \
of the hyperbolic plane (disk model).
It requires the presence of "poincare_disk.kpyh" in the same directory:
http://dmf.unicatt.it/~paolini/pykig-examples/poincare/disco/poincare_disk.kpyh

a fractal can be found in

http://dmf.unicatt.it/~paolini/pykig-examples/fractals/sierpinski.kpy

Unfortunately I do not have at the moment the possibility to test the patch myself...

Maurizio
 
> - Albert Astals Cid
> 
> 
> On April 13, 2012, 11:48 a.m., David Narváez wrote:
> > 
> > -----------------------------------------------------------
> > This is an automatically generated e-mail. To reply, visit:
> > http://git.reviewboard.kde.org/r/104584/
> > -----------------------------------------------------------
> > 
> > (Updated April 13, 2012, 11:48 a.m.)
> > 
> > 
> > Review request for KDE Edu.
> > 
> > 
> > Description
> > -------
> > 
> > Pretty straightforward, the question is actually if anybody disagrees. The one \
> > issue I would be concerned about is performance, but I would expect this not to \
> > be an issue in modern computers, yet I don't have any stress case to test this \
> > against. 
> > 
> > This addresses bug 122376.
> > http://bugs.kde.org/show_bug.cgi?id=122376
> > 
> > 
> > Diffs
> > -----
> > 
> > misc/kigpainter.cpp 18d4396 
> > 
> > Diff: http://git.reviewboard.kde.org/r/104584/diff/
> > 
> > 
> > Testing
> > -------
> > 
> > Compare drawing a large circle with and without this patch to see antialiasing in \
> > action. 
> > 
> > Thanks,
> > 
> > David Narváez
> > 
> > 
> 

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