At Wednesday 27/9/2006 20:43, Leif K-Brooks wrote:
> I'm trying to plot some points in an image. Each point has an
> associating type and I'd like to have different colors (preferrably of
> high contrast) for different types. The number of types in the data
> file is unknown a priori. Is there a way to do this at runtime?
If you don't know how many colors are needed even at run time, this code
might be helpful. But it generates colors that look similar pretty
quickly, so I wouldn't use it unless you have to. (Anyone know of a
better algorithm for this?)
Try this. It first chooses 0, 1/2, then 1/4, 3/4, then */8...
It's the best I could make if you don't know the number of colors
beforehand. If you *do* know how many colors, your previous response is OK.
from colorsys import hsv_to_rgb
def hues():
denom = 1
yield 0
while True:
num = 1
while num<denom:
yield float(num)/denom
num += 2
denom += denom
def colors():
for hue in hues():
r, g, b = hsv_to_rgb(hue, 1.0, 1.0)
yield int(r*255), int(g*255), int(b*255)
Gabriel Genellina
Softlab SRL
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