patch function with fltk in 3.1.52+

[Kai Habel]

martin_helm schrieb:
>
> martin_helm wrote:
>   
>> Hello,
>>
>> while trying the patch function (as a substitute for trisurf) with the
>> recent development sources and backend fltk, I noticed a problem with the
>> color settings, the following does what I expect
>>
>> octave:1> backend("fltk")
>> octave:2> T = [1 2 3];
>> octave:3> p = [0 0 0; 0 1 0; 1 1 1];
>> octave:4> patch ('Faces', T, 'Vertices', p, "r")
>>
>> I see a red triangle with black borders. 
>> If I pass an rgb (e. g. [0.5 0.5 0.5] ) vector as the help patch suggests
>> the triangle does not change color (independent of the values).
>> Using 
>>
>> shading flat 
>>
>> to avoid the black borders it leads to a completely black triangle.
>> If I call then again
>>
>> patch ('Faces', T, 'Vertices', p, "r")
>>
>> the colors of border and area are reverted (that means a black triangle
>> with a red border instead of a red triangle with a black border as
>> before).
>>
>> Is there something which I missunderstand or is it simply something which
>> is not yet implemented?
>>
>> I am running linux 2.6.27.7-9-default 64 bit on AMD Athlon Dualcore 2 GHz. 
>>
>> I checked the same with a 3.0.3 version and jhandles 0.3.4 where I can
>> assign different colors to the facets (on WinXP). but shading flat does
>> also not work ( here it throws an exception and does not affect the
>> graphics at all).
>>
>> - mh
>>
>>
>>
>>     
>
> To answer a part of my own question:
>
> I found that 
>
> patch('Faces',T,'Vertices',p,'FaceVertexCData', c, 'FaceColor','flat',
> 'EdgeColor', 'none')
>
> does exactly what I was looking for.
>
> One question remains, what is the intended behaviour if a shading command is
> invoked afterwards?
>
>   
Hello Martin,

patches are not fully implemented for the fltk/OpenGL backend.
<http://dict.leo.org/ende?lp=ende&p=thMx3r&search=unfortunately>Unfortunately,
nobody is working on this currently, so any help is welcome. And yes ...
in the end it should be compatible as much as possible with matlab.

Kai