[Octave-bug-tracker] [bug #60897] caxis affected by rectangle and patch graphic without scaled color

[Ryan Gray]

URL:
  <https://savannah.gnu.org/bugs/?60897>

                 Summary: caxis affected by rectangle and patch graphic
without scaled color
                 Project: GNU Octave
            Submitted by: ryangray
            Submitted on: Fri 09 Jul 2021 12:21:56 AM MDT
                Category: Plotting
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Regression
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
                 Release: 6.2.0
         Discussion Lock: Any
        Operating System: Microsoft Windows

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Details:

In Octave 6.1 and 6.2, adding a rectangle graphic to an imagesc plot, the
caxis limits are affected. In Octave 5.2, the limits are unaffected as it is
in MATLAB. I have not found anything that mentions this as an intentional
change. I have tested this on Windows.


>> figure; imagesc(rand(16)+1);
>> caxis

ans =

   1.0020   1.9928

>> hold on; rectangle('position',[4 4 4 4]);
>> caxis
ans =

        0   1.9928


I would expect the lower value to still be 1.0020.

Adding a patch graphic that doesn't use scaled color also affects the caxis
when it shouldn't. 


>> figure; imagesc(rand(16)+1);
>> hold on; p = patch([1 4 4]',[1 1 4],'w','edgecolor','c');
>> caxis
ans =

        0   1.9996


Interestingly, if we re-assert the cdata property as empty, it corrects the
caxis:


>> get(p,'cdata')
ans = [](0x0)
>> set(p,'cdata',[])
>> caxis
ans =

   1.0003   1.9996


If the rectangle is being drawn with a patch, it's likely why the rectangle
has the same problem. 





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