Re: Strange autoscaling with rgbimage and inverted yranges

[Dima K. <gn...@di...>]

Ethan A Merritt <me...@uw...> writes:

> I think the issue is that because your example uses in-line data it
> cannot be re-read. The program tries to work around this by reusing
> the contents of the various internal data structures but in this case
> the workaround fails. Possibly fixable, but I think the primary lesson
> is that data blocks are much preferred to in-line data if you are
> going to be manipulating/re-drawing the plot.

Hi.

100% of my fairly heavy usage of gnuplot uses inline data. The
particular case in this report is fairly common too: when doing any sort
of computer vision that annotates an image, you want to display the
source image with a flipped y axis, since the origin pixel is at the
top-left.

In any case, this worked in 5.2. I just did a bisection, and I can now
see why this seemed familiar. The commit that broke it:

  https://sourceforge.net/p/gnuplot/gnuplot-main/ci/36a2407e50/

The person who broke it was me! But despite what git says, I have very
little recollection of any of this. Ethan: do you have a good sense of
what's happening here, and can you easily fix it now? If not, I can poke
at it, and figure it out.

dima