[Octave-bug-tracker] [bug #48664] imshow for binary data: colormap not handled correctly for gnuplot

[Dan Sebald]

Follow-up Comment #6, bug #48664 (project octave):

OK, here's a new version of the patch, after having had some discussion on
color mapping:

https://savannah.gnu.org/bugs/?48666

I did significant rework of the way scaling is done.  The code currently has
gnuplot cbrange as [clim(1):clim(2)], but that actually makes things more
difficult.  Instead, I set up the cbrange to [1:cmap_sz] which means that the
linear mapping is pretty much as defined in terms of index value.

So, this new patch should fix the special logical-value images, and it should
also make the examples at the above link consistent with Qt toolkit.  Try the
examples below.


a = rand(10,10);
imshow((a > 0.5));
imshow((a > 0.5), [1,0,0;0,1,0]);
set(gca,'climmode','manual');
set(gca,'clim',[3 5]);

clf
demo('surf', 1)
kids = get(gca,'Children');
set(kids(1),'cdatamapping','scaled')
set(gca,'climmode','manual')
set(gca,'clim',[0 1]);
set(kids(1),'cdatamapping','direct');


(file #38124)
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Additional Item Attachment:

File name: octave-gnuplot_bug48664_cdatamapping-djs2016aug06.patch Size:9 KB


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