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#!/usr/bin/env python
from OpenGL.GL import *
from OpenGL.Tk import *
try:
from Numeric import *
except:
import sys
print "This demo requires the Numeric extension, sorry."
sys.exit()
n=50
a=arange(0,n)
x,y = cos(2*pi*a/n), sin(3*2*pi*a/n)
colors=ones((n, 3))
colors[0]=[1,0,0]
colors[25]=[1,1,0]
def redraw(o):
glClearColor(0.5, 0.5, 0.5, 0)
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)
glOrtho(-1,1,-1,1,-1,1)
glDisable(GL_LIGHTING)
glBegin(GL_LINE_LOOP)
glColorVertex2(x,y, colors)
glEnd()
glEnable(GL_LIGHTING)
def main():
o = Opengl(width = 400, height = 400, double = 1)
o.redraw = redraw
o.autospin_allowed = 1
o.pack(side = 'top', expand = 1, fill = 'both')
o.mainloop()
main()
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