| Guido van Rossum | 453bd40 | 1992-03-30 13:18:37 +0000 | [diff] [blame^] | 1 | #! /usr/local/python |
| 2 | |
| 3 | # Use Gouraud shading to mix colors. Requires Z-buffer. |
| 4 | # It changes the color assignments so fast that you see white. |
| 5 | # Left button pauses, middle rotates the square. ESC to quit. |
| 6 | # Experiment with a larger window (too slow) or smaller window (really white). |
| 7 | |
| 8 | from GL import * |
| 9 | from gl import * |
| 10 | import DEVICE |
| 11 | from math import * |
| 12 | |
| 13 | # |
| 14 | # tekenvlak : draw a square. with bgnpolygon |
| 15 | # |
| 16 | def tekenvlak (vc) : |
| 17 | bgnpolygon() |
| 18 | #vcarray (vc) |
| 19 | for i in vc : |
| 20 | c3f (i[1]) |
| 21 | v3f (i[0]) |
| 22 | endpolygon() |
| 23 | |
| 24 | # |
| 25 | # tekendoos : draw a box |
| 26 | # |
| 27 | def tekendoos (col) : |
| 28 | 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)] |
| 29 | vc = [(v[0],col[0]),(v[1],col[1]),(v[2],col[2]),(v[3],col[1])] |
| 30 | tekenvlak (vc) |
| 31 | |
| 32 | # |
| 33 | # initialize gl |
| 34 | # |
| 35 | def initgl () : |
| 36 | # |
| 37 | # open window |
| 38 | # |
| 39 | foreground () |
| 40 | keepaspect (1, 1) |
| 41 | prefposition (100, 500, 100, 500) |
| 42 | w = winopen ('PYTHON RGB') |
| 43 | keepaspect (1, 1) |
| 44 | winconstraints() |
| 45 | # |
| 46 | # configure pipeline (2buf, GOURAUD and RGBmode) |
| 47 | # |
| 48 | doublebuffer () |
| 49 | zbuffer (1) |
| 50 | shademodel (GOURAUD) |
| 51 | RGBmode () |
| 52 | gconfig () |
| 53 | # |
| 54 | # set viewing |
| 55 | # |
| 56 | perspective (900, 1, 1.0, 10.0) |
| 57 | polarview (10.0, 0, 0, 0) |
| 58 | # |
| 59 | # ask for the REDRAW and ESCKEY events |
| 60 | # |
| 61 | qdevice(DEVICE.MOUSE2) |
| 62 | qdevice(DEVICE.MOUSE3) |
| 63 | qdevice(DEVICE.REDRAW) |
| 64 | qdevice(DEVICE.ESCKEY) |
| 65 | |
| 66 | |
| 67 | # |
| 68 | # the color black |
| 69 | # |
| 70 | black = 0 |
| 71 | # |
| 72 | # GoForIT : use 2buf to redraw the object 2n times. index i is used as |
| 73 | # the (smoothly changing) rotation angle |
| 74 | # |
| 75 | def GoForIt(i) : |
| 76 | col = [(255.0,0.0,0.0), (0.0,255.0,0.0), (0.0,0.0,255.0)] |
| 77 | twist = 0 |
| 78 | freeze = 1 |
| 79 | while 1 : |
| 80 | if freeze <> 0 : |
| 81 | col[0],col[1],col[2] = col[1],col[2],col[0] |
| 82 | # |
| 83 | # clear z-buffer and clear background to light-blue |
| 84 | # |
| 85 | zclear() |
| 86 | cpack (black) |
| 87 | clear() |
| 88 | # |
| 89 | tekendoos (col) |
| 90 | # |
| 91 | swapbuffers() |
| 92 | # |
| 93 | if qtest() <> 0 : |
| 94 | dev, val = qread() |
| 95 | if dev == DEVICE.ESCKEY : |
| 96 | break |
| 97 | elif dev == DEVICE.REDRAW : |
| 98 | reshapeviewport () |
| 99 | elif dev == DEVICE.MOUSE2 and val <> 0 : |
| 100 | twist = twist + 30 |
| 101 | perspective (900, 1, 1.0, 10.0) |
| 102 | polarview (10.0, 0, 0, twist) |
| 103 | elif dev == DEVICE.MOUSE3 and val <> 0 : |
| 104 | freeze = 1 - freeze |
| 105 | |
| 106 | |
| 107 | # the main program |
| 108 | # |
| 109 | def main () : |
| 110 | initgl () |
| 111 | GoForIt (0) |
| 112 | |
| 113 | # |
| 114 | # exec main |
| 115 | # |
| 116 | main () |