#=======================================================================
# Rainbow scale color map (going from violet to red, 390-680 nm, in 
# going from color index 16 to 239).
#
# This routine requires the module wavelen2rgb which converts
# visible wavelength in nm to RGB triples.  The code can be found
# here:  http://www.johnny-lin.com/py_code/wavelen2rgb.py.
#
# Copyright (c) 2003 by Johnny Lin.  For licensing, distribution
# conditions, contact information, and additional documentation see
# the URL http://www.johnny-lin.com/pylib.html#license.
#=======================================================================


#- Import modules and open VCS canvas:

import vcs
from wavelen2rgb import wavelen2rgb
v = vcs.init()


#- Copy the default color map to create my own color map "my_cmap":

my_cmap = v.createcolormap('my_cmap', 'default')


#- Make a list of evenly spaced wavelengths from 390-680 nm:

wavelengths = vcs.mkevenlevels(390,680,240-16-1)


#- Compute RGB values and fill the my_cmap.index dictionary for
#  color indices 16 to 239:

for i in range(16,240):
    my_cmap.index[i] = wavelen2rgb(wavelengths[i-16])


#- Set my color map to the active color map:

v.setcolormap('my_cmap')




#====== end of file ======