[gameprogrammer] Re: mapping numbers to colors

Alan Wolfe wrote:

>Hey guys,
>wierd question, possibly straight out of the old school days...
>
>I'm making some line graphs and i have X number of groups of data.
>
>X could be 1 or it could be 20, it varies.
>
>What im trying to do is come up with a good way to automaticly set colors to 
>these groups of data.
>
>ie if there were 2 groups, 1 line could be red and the 2nd line could be blue.
>
>if there were 4 groups, i could use red, blue, yellow, green for the lines etc.
>
>Does anyone know a way to algorithmicly come up with X number of colors, that 
>are as far apart visualy as possible?  Cause if theres 5 groups of data and 
>they are all shades of blue, thats not very good.
>
Here's what I usually do (probably not the best way but whatever) :
I'm coloring objects that are subsequently drawn in 3d and shaded. Thus 
I only want to set the raw color, not the shades.
After a first pass to know how many groups I have, I work in the HSV 
color space, and take a number of points (equal to the number of groups) 
regularly spaced around H axis, and take S=1 and V=1.
Then, I convert the color from HSV space to RGB space for each of these 
points and that's the color for the corresponding 
object/data/cluster/class/whatever. And that's all.

Stephane





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