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#! /ufs/guido/bin/sgi/python
# Use Gouraud shading to mix colors. Requires Z-buffer.
# It changes the color assignments so fast that you see white.
# Left button pauses, middle rotates the square. ESC to quit.
# Experiment with a larger window (too slow) or smaller window (really white).
from GL import *
from gl import *
import DEVICE
from math import *
#
# tekenvlak : draw a square. with bgnpolygon
#
def tekenvlak (vc) :
bgnpolygon()
#vcarray (vc)
for i in vc :
c3f (i[1])
v3f (i[0])
endpolygon()
#
# tekendoos : draw a box
#
def tekendoos (col) :
v = [(-5.0,0.0,0.0),(0.0,5.0,0.0),(5.0,0.0,0.0),(0.0,-5.0,0.0)]
vc = [(v[0],col[0]),(v[1],col[1]),(v[2],col[2]),(v[3],col[1])]
tekenvlak (vc)
#
# initialize gl
#
def initgl () :
#
# open window
#
foreground ()
keepaspect (1, 1)
prefposition (100, 500, 100, 500)
w = winopen ('PYTHON RGB')
keepaspect (1, 1)
winconstraints()
#
# configure pipeline (2buf, GOURAUD and RGBmode)
#
doublebuffer ()
zbuffer (1)
shademodel (GOURAUD)
RGBmode ()
gconfig ()
#
# set viewing
#
perspective (900, 1, 1.0, 10.0)
polarview (10.0, 0, 0, 0)
#
# ask for the REDRAW and ESCKEY events
#
qdevice(DEVICE.MOUSE2)
qdevice(DEVICE.MOUSE3)
qdevice(DEVICE.REDRAW)
qdevice(DEVICE.ESCKEY)
#
# the color black
#
black = 0
#
# GoForIT : use 2buf to redraw the object 2n times. index i is used as
# the (smoothly changing) rotation angle
#
def GoForIt(i) :
col = [(255.0,0.0,0.0), (0.0,255.0,0.0), (0.0,0.0,255.0)]
twist = 0
freeze = 1
while 1 :
if freeze <> 0 :
col[0],col[1],col[2] = col[1],col[2],col[0]
#
# clear z-buffer and clear background to light-blue
#
zclear()
cpack (black)
clear()
#
tekendoos (col)
#
swapbuffers()
#
if qtest() <> 0 :
dev, val = qread()
if dev = DEVICE.ESCKEY :
break
elif dev = DEVICE.REDRAW :
reshapeviewport ()
elif dev = DEVICE.MOUSE2 and val <> 0 :
twist = twist + 30
perspective (900, 1, 1.0, 10.0)
polarview (10.0, 0, 0, twist)
elif dev = DEVICE.MOUSE3 and val <> 0 :
freeze = 1 - freeze
# the main program
#
def main () :
initgl ()
GoForIt (0)
#
# exec main
#
main ()
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