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#! /usr/bin/env python
# zrgb (Requires Z buffer.)
#
# This program demostrates zbuffering 3 intersecting RGB polygons while
# in doublebuffer mode where, movement of the mouse with the LEFTMOUSE
# button depressed will, rotate the 3 polygons. This is done by compound
# rotations allowing continuous screen-oriented rotations.
#
# Press the "Esc" key to exit.
from gl import *
from GL import *
from DEVICE import *
idmat=[1,0,0,0,0,1,0,0,0,0,1,0,0,0,0,1]
def main() :
#
# old and new mouse position
#
#
mode = 0
omx = 0
mx = 0
omy = 0
my = 0
#
objmat=[1,0,0,0,0,1,0,0,0,0,1,0,0,0,0,1]
#
initialize ()
#
draw_scene (objmat)
#
while (1) :
#
dev, val = qread()
#
if dev == ESCKEY :
if val :
break
# exit when key is going up, not down
# this avoids the scenario where a window
# underneath this program's window
# would otherwise "eat up" the up-
# event of the Esc key being released
return
#
elif dev == REDRAW :
reshapeviewport()
draw_scene(objmat)
#
elif dev == LEFTMOUSE:
omx = mx
omy = my
if val :
mode = 1
else :
mode = 0
elif dev == MOUSEX :
omx = mx
mx = val
#print omx, mx
objmat = update_scene(objmat,mx,my,omx,omy,mode)
#
elif dev == MOUSEY :
omy = my
my = val
#print omy, my
objmat = update_scene(objmat,mx,my,omx,omy,mode)
#
def initialize () :
#
foreground ()
keepaspect(5, 4)
w = winopen('Zbuffered RGB')
#
doublebuffer()
RGBmode()
gconfig()
zbuffer(1)
lsetdepth(0x0, 0x7FFFFF)
#
qdevice(ESCKEY)
qdevice(LEFTMOUSE)
qdevice(MOUSEX)
qdevice(MOUSEY)
def update_scene (mat, mx, my, omx, omy, mode) :
#
if mode == 1 :
mat = orient(mat, mx, my, omx, omy)
draw_scene(mat)
return mat
def orient (mat, mx, my, omx, omy) :
#
#
pushmatrix()
loadmatrix(idmat)
#
if mx - omx : rot (float (mx - omx), 'y')
if omy - my : rot (float (omy - my), 'x')
#
multmatrix(mat)
mat = getmatrix()
#
popmatrix()
#
return mat
def draw_scene (mat) :
RGBcolor(40, 100, 200)
clear()
zclear()
#
perspective(400, 1.25, 30.0, 60.0)
translate(0.0, 0.0, -40.0)
multmatrix(mat)
#
# skews original view to show all polygons
#
rotate(-580, 'y')
draw_polys()
#
swapbuffers()
polygon1 = [(-10.0,-10.0,0.0),(10.0,-10.0,0.0),(-10.0,10.0,0.0)]
polygon2 = [(0.0,-10.0,-10.0),(0.0,-10.0,10.0),(0.0,5.0,-10.0)]
polygon3 = [(-10.0,6.0,4.0),(-10.0,3.0,4.0),(4.0,-9.0,-10.0),(4.0,-6.0,-10.0)]
def draw_polys():
bgnpolygon()
cpack(0x0)
v3f(polygon1[0])
cpack(0x007F7F7F)
v3f(polygon1[1])
cpack(0x00FFFFFF)
v3f(polygon1[2])
endpolygon()
#
bgnpolygon()
cpack(0x0000FFFF)
v3f(polygon2[0])
cpack(0x007FFF00)
v3f(polygon2[1])
cpack(0x00FF0000)
v3f(polygon2[2])
endpolygon()
#
bgnpolygon()
cpack(0x0000FFFF)
v3f(polygon3[0])
cpack(0x00FF00FF)
v3f(polygon3[1])
cpack(0x00FF0000)
v3f(polygon3[2])
cpack(0x00FF00FF)
v3f(polygon3[3])
endpolygon()
main ()
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