I would like to define a colour ramp for displaying direction data in a 'smooth' fashion. So for data in degrees there wouldn't be a jump in colour between 359 and 0 degrees. It seems to me a colour wheel would be great for this. I haven't seen this done, the preset ramps in arc don't do it, but I would think someone must have.
My question is how to implement this. My thought is to combine a ramp from red through yellow to green with one from green through blue to red (or whatever the proper quadrant colours are) and map that to 0 through 90 to 180 and 180 through 270 to 360. But I don't know how to set this up. Any ideas on how to define the ramps?