Demo/sgi/gl/backface.py

   1 #! /usr/bin/env python
   2
   3 #   backface
   4 #
   5 #   draw a cube that can run with backface() turned on or off.
   6 #   cube is moved when LEFTMOUSE is pressed and mouse itself is moved.
   7
   8 from gl import *
   9 from DEVICE import *
  10 from GL import *
  11
  12 CUBE_SIZE = 200.0
  13 CUBE_OBJ = 1
  14
  15 def main () :
  16         #
  17         x = 0
  18         y = 0
  19         moveit = 0
  20         #
  21         initialize()
  22         #
  23         while (1) :
  24                 #
  25                 while (qtest()) :
  26                         dev, val = qread()
  27                         #
  28                         if dev == ESCKEY :
  29                                 backface(0)
  30                                 return
  31                                 #
  32                         elif dev == REDRAW :
  33                                 reshapeviewport()
  34                                 drawcube(x,y)
  35                                 #
  36                         elif dev == LEFTMOUSE :
  37                                 #
  38                                 # LEFTMOUSE down
  39                                 moveit = val
  40                                 #
  41                         elif dev == BKEY :
  42                                 backface(1)
  43                                 drawcube(x,y)
  44                                 #
  45                         elif dev == FKEY :
  46                                 backface(0)
  47                                 drawcube(x,y)
  48                                 #
  49                 if moveit :
  50                         x = getvaluator(MOUSEX)
  51                         y = getvaluator(MOUSEY)
  52                         drawcube(x,y)
  53
  54
  55 def initialize () :
  56         foreground ()
  57         keepaspect (1, 1)
  58         gid = winopen('backface')
  59         winset(gid)
  60         winconstraints()
  61         #
  62         doublebuffer()
  63         gconfig()
  64         shademodel(FLAT)
  65         #
  66         ortho(-1024.0, 1024.0, -1024.0, 1024.0, -1024.0, 1024.0)
  67         #
  68         qdevice(ESCKEY)
  69         qdevice(REDRAW)
  70         qdevice(LEFTMOUSE)
  71         qdevice(BKEY)
  72         qdevice(FKEY)
  73         qenter(REDRAW,gid)
  74         #
  75         backface(1)
  76
  77 #
  78 # define a cube
  79 def cube () :
  80         #
  81         # front face
  82         pushmatrix()
  83         translate(0.0,0.0,CUBE_SIZE)
  84         color(RED)
  85         rectf(-CUBE_SIZE,-CUBE_SIZE,CUBE_SIZE,CUBE_SIZE)
  86         popmatrix()
  87         #
  88         # right face
  89         pushmatrix()
  90         translate(CUBE_SIZE, 0.0, 0.0)
  91         rotate(900, 'y')
  92         color(GREEN)
  93         rectf(-CUBE_SIZE,-CUBE_SIZE,CUBE_SIZE,CUBE_SIZE)
  94         popmatrix()
  95         #
  96         # back face
  97         pushmatrix()
  98         translate(0.0, 0.0, -CUBE_SIZE)
  99         rotate(1800, 'y')
 100         color(BLUE)
 101         rectf(-CUBE_SIZE,-CUBE_SIZE,CUBE_SIZE,CUBE_SIZE)
 102         popmatrix()
 103         #
 104         # left face
 105         pushmatrix()
 106         translate(-CUBE_SIZE, 0.0, 0.0)
 107         rotate(-900, 'y')
 108         color(CYAN)
 109         rectf(-CUBE_SIZE,-CUBE_SIZE,CUBE_SIZE,CUBE_SIZE)
 110         popmatrix()
 111         #
 112         # top face
 113         pushmatrix()
 114         translate(0.0, CUBE_SIZE, 0.0)
 115         rotate(-900, 'x')
 116         color(MAGENTA)
 117         rectf(-CUBE_SIZE,-CUBE_SIZE,CUBE_SIZE,CUBE_SIZE)
 118         popmatrix()
 119         #
 120         # bottom face
 121         pushmatrix()
 122         translate(0.0, -CUBE_SIZE, 0.0)
 123         rotate(900, 'x')
 124         color(YELLOW)
 125         rectf(-CUBE_SIZE,-CUBE_SIZE,CUBE_SIZE,CUBE_SIZE)
 126         popmatrix()
 127
 128 def drawcube(x,y) :
 129         #
 130         pushmatrix()
 131         rotate(2*x, 'x')
 132         rotate(2*y, 'y')
 133         color(BLACK)
 134         clear()
 135         cube()
 136         popmatrix()
 137         swapbuffers()
 138
 139
 140 main ()