patch with interpolated color

[RodgerWu]

Hi, 

I am new to Octave and have been using Matlab for a long time.

In matlab I am able to use 'patch' to plot a polygon of any shape filled
with color interpolated based on colors specified for each vertex. 

I just found that 'patch' in Octave is great for uniform color and doesn't
support color interpolation at all. Is this true?

for example, how do I plot a triangle with vertexes at  [0 0; 1 0; 1 1] and
colors at each corner represented by 0, 1, 2 respectively?

Thanks for the helps!

Rodger
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