[Octave-bug-tracker] [bug #65421] patch/cdata does not work.

[Liang Tang]

URL:
  <https://savannah.gnu.org/bugs/?65421>

                 Summary: patch/cdata does not work. 
                   Group: GNU Octave
               Submitter: lt1234
               Submitted: Wed 06 Mar 2024 01:02:26 PM UTC
                Category: Octave Function
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Unexpected Error or Warning
                  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: Wed 06 Mar 2024 01:02:26 PM UTC By: Liang Tang <lt1234>

patch/cdata does not work.  It leads to an warning below, which should have
been an error. Thanks. 

warning: opengl_renderer: some vertices in "faces" property are undefined. 
Not rendering.

facevertexcdata is  undocumented. But it works except RGB input.


P = [ 2.5    7.5
      6.5    7.0
      2.5    5.5
      6.5    6.0
      1.0    6.5
      8.0    6.5]
      
T = [5  3  1;
     1  4  2;
     1  3  4;
     4  6  2];  

D=20;

D=round( 64*rand(size(P,1), 1));            % index to colormap 
D=round(255*rand(size(P,1), 3));            % RGB 

D=round(125*rand(size(P,1), size(T,1)));    % don't make sense what this is
for  
D=round(125*rand(size(T,1), size(P,1)));    % Not an option in Octave
documentation; don't make sense what this is for  

D=round( 64*rand(size(T,1), 1));            % Not an option in Octave
documentation 
D=round(255*rand(size(T,1), 3));            % Not an option in Octave
documentation 

% none would work 
     
patch(...
'Vertices', P, ...    
'CData', D,    % 'FaceVertexCData', D,      % Octave facevertexcdata is 
undocumented. 
'Faces', T,...   
'FaceColor', 'interp',...
'EdgeColor', 'interp',...
'FaceAlpha', 0.5,...
'LineWidth', 2);



Documentation:  

cdata: scalar | matrix, def. [](0x0)
Data defining the patch object color. Patch color can be defined for faces or
for vertices. 
If cdata is a scalar index into the current colormap or a RGB triplet, it
defines the color of all faces.     
If cdata is an N-by-1 vector of indices or an N-by-3 (RGB) matrix, it defines
the color of each one of the N faces.  
If cdata is an N-by-M or an N-by-M-by-3 (RGB) matrix, it defines the color at
each vertex.   

facevertexcdata is  undocumented. 

N is size of Vertices matrix. (P here)
colormap is 64x3.
RGB is 0-255.







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