[Octave-bug-tracker] [bug #65363] fill3 alters the graphic already with hold-on.

[Liang Tang]

URL:
  <https://savannah.gnu.org/bugs/?65363>

                 Summary: fill3 alters the graphic already with hold-on.
                   Group: GNU Octave
               Submitter: lt1234
               Submitted: Sat 24 Feb 2024 11:20:28 PM UTC
                Category: Octave Function
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Incorrect Result
                  Status: None
             Assigned to: None
         Originator Name: lt1234
        Originator Email: 
             Open/Closed: Open
                 Release: 8.2.0
         Discussion Lock: Any
        Operating System: Microsoft Windows
           Fixed Release: None
         Planned Release: None


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Follow-up Comments:


-------------------------------------------------------
Date: Sat 24 Feb 2024 11:20:28 PM UTC By: Liang Tang <lt1234>
Hi, 

I observed what below with fill3.  Therefore, I reported specifically for
fill3 only.  Ihis issue is also a matlab compatibility issue.  

In the example, the same data, P, are displayed with patch and fill3
respectively in subplots 1 and 2. The resulting overall displays from the two
functions are different.  

The patch and fill3 subplots , with different view, [0 90] and [-37.5 30], are
incompatible with matlab, both [0 90].  Octave fill3 must have triggered new
camera parameters, while the patch and fill3 defined by P occupy the same
space.  I did not find any documentation to indicate the two functions should
be different in updating display with hold-on. Therefore, I expect the two
subplots to be identical.  

The small example demonstrates the fill3 compatibility issue:   


% both CCW order P0 is estimated from plane_1=@(x) [1 2 3 ]*x-06;  

P0=[6  3 -4 
    0 -2 -4
    0 -6  6 
    6 -6  3]; 

% an arbitrary rectangle     
    
P=[...
   2.2136   1.8866   2.4160
   1.5450   2.8580   0.1131
  -0.9062   1.1710   0.1131
  -0.2377   0.1995   2.4160];  
  
figure; 
ax1=subplot(1,2,1); 
patch(ax1,P0(:,1), P0(:,2), P0(:,3), 'r'); hold on; xlabel('x'); ylabel('y');
title('patch')
patch(ax1,P(:,1),  P( :,2), P( :,3), 'c');   % subplot(1,2,1); ; view([-37.5
30]);   
ax2=subplot(1,2,2); 
patch(ax2,P0(:,1), P0(:,2), P0(:,3), 'r'); hold on; xlabel('x'); ylabel('y');
title('fill3')
fill3(ax2,P( :,1), P( :,2), P( :,3), 'c');   % subplot(1,2,2); ; view([0 90]);
  
 
saveas(gcf, 'patch_fill3.ofig'); 

subplot(1,2,1); a1=get(gca); subplot(1,2,2); a2=get(gca);

[a1.view;           a2.view]
[a1.cameratarget;   a2.cameratarget]
[a1.cameraposition; a2.cameraposition]
 






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<http://savannah.gnu.org/bugs/download.php?file_id=55744>

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