[RFC] Gradient fill options

[Ethan M. <merritt@u.washington.edu>]

I have requested that the next major release of libgd include a
gradient-fill routine.  The proposed mechanism is
   gdImageShadedTriangle(gdImagePtr image, gdPoint *vertex, int *color);
That is, a filled triangle with interpolation of three separate colors
specified for the three vertices.  Filled quadrangles are easily
produced by splitting each one into 2 triangles.

This would allow us to support gradient fill for the PNG/JPEG terminal.

My primary thought is to allow a PM3D shading mode that provides
smooth coloring.  

Are there other uses?  The colorbar?

Your thoughts and suggestions are welcome.


-- 
Ethan A Merritt					Courier Deliveries: 1959 NE Pacific	
Dept of Biochemistry    M/S 357742
Health Sciences Building
University of Washington - Seattle