1996-11-27 19:52:01 +00:00
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#! /usr/bin/env python
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1992-03-30 13:18:37 +00:00
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# Use Gouraud shading to mix colors. Requires Z-buffer.
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# It changes the color assignments so fast that you see white.
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# Left button pauses, middle rotates the square. ESC to quit.
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# Experiment with a larger window (too slow) or smaller window (really white).
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from GL import *
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from gl import *
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import DEVICE
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from math import *
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#
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# tekenvlak : draw a square. with bgnpolygon
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#
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def tekenvlak (vc) :
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bgnpolygon()
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#vcarray (vc)
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for i in vc :
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c3f (i[1])
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v3f (i[0])
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endpolygon()
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#
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# tekendoos : draw a box
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#
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def tekendoos (col) :
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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)]
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vc = [(v[0],col[0]),(v[1],col[1]),(v[2],col[2]),(v[3],col[1])]
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tekenvlak (vc)
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#
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# initialize gl
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#
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def initgl () :
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#
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# open window
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#
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foreground ()
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keepaspect (1, 1)
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prefposition (100, 500, 100, 500)
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w = winopen ('PYTHON RGB')
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keepaspect (1, 1)
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winconstraints()
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#
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# configure pipeline (2buf, GOURAUD and RGBmode)
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#
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doublebuffer ()
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zbuffer (1)
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shademodel (GOURAUD)
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RGBmode ()
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gconfig ()
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#
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# set viewing
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#
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perspective (900, 1, 1.0, 10.0)
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polarview (10.0, 0, 0, 0)
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#
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# ask for the REDRAW and ESCKEY events
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#
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qdevice(DEVICE.MOUSE2)
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qdevice(DEVICE.MOUSE3)
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qdevice(DEVICE.REDRAW)
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qdevice(DEVICE.ESCKEY)
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#
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# the color black
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#
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black = 0
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#
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# GoForIT : use 2buf to redraw the object 2n times. index i is used as
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# the (smoothly changing) rotation angle
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#
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def GoForIt(i) :
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col = [(255.0,0.0,0.0), (0.0,255.0,0.0), (0.0,0.0,255.0)]
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twist = 0
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freeze = 1
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while 1 :
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if freeze <> 0 :
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col[0],col[1],col[2] = col[1],col[2],col[0]
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#
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# clear z-buffer and clear background to light-blue
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#
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zclear()
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cpack (black)
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clear()
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#
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tekendoos (col)
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#
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swapbuffers()
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#
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if qtest() <> 0 :
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dev, val = qread()
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if dev == DEVICE.ESCKEY :
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break
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elif dev == DEVICE.REDRAW :
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reshapeviewport ()
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elif dev == DEVICE.MOUSE2 and val <> 0 :
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twist = twist + 30
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perspective (900, 1, 1.0, 10.0)
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polarview (10.0, 0, 0, twist)
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elif dev == DEVICE.MOUSE3 and val <> 0 :
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freeze = 1 - freeze
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# the main program
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#
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def main () :
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initgl ()
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GoForIt (0)
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#
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# exec main
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#
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main ()
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