| Guido van Rossum | 23bafde | 1992-12-14 13:03:10 +0000 | [diff] [blame] | 1 | #! /usr/local/bin/python |
| Guido van Rossum | 453bd40 | 1992-03-30 13:18:37 +0000 | [diff] [blame] | 2 | |
| 3 | # Rotate a 3D surface created using NURBS. |
| 4 | # |
| 5 | # Press left mouse button to toggle surface trimming. |
| 6 | # Press ESC to quit. |
| 7 | # |
| 8 | # See the GL manual for an explanation of NURBS. |
| 9 | |
| 10 | from gl import * |
| 11 | from GL import * |
| 12 | from DEVICE import * |
| 13 | |
| 14 | TRUE = 1 |
| 15 | FALSE = 0 |
| 16 | ORDER = 4 |
| 17 | |
| 18 | idmat = [1,0,0,0, 0,1,0,0, 0,0,1,0, 0,0,0,1] |
| 19 | |
| 20 | surfknots = [-1, -1, -1, -1, 1, 1, 1, 1] |
| 21 | |
| 22 | def make_ctlpoints(): |
| 23 | c = [] |
| 24 | # |
| 25 | ci = [] |
| 26 | ci.append(-2.5, -3.7, 1.0) |
| 27 | ci.append(-1.5, -3.7, 3.0) |
| 28 | ci.append(1.5, -3.7, -2.5) |
| 29 | ci.append(2.5, -3.7, -0.75) |
| 30 | c.append(ci) |
| 31 | # |
| 32 | ci = [] |
| 33 | ci.append(-2.5, -2.0, 3.0) |
| 34 | ci.append(-1.5, -2.0, 4.0) |
| 35 | ci.append(1.5, -2.0, -3.0) |
| 36 | ci.append(2.5, -2.0, 0.0) |
| 37 | c.append(ci) |
| 38 | # |
| 39 | ci = [] |
| 40 | ci.append(-2.5, 2.0, 1.0) |
| 41 | ci.append(-1.5, 2.0, 0.0) |
| 42 | ci.append(1.5, 2.0, -1.0) |
| 43 | ci.append(2.5, 2.0, 2.0) |
| 44 | c.append(ci) |
| 45 | # |
| 46 | ci = [] |
| 47 | ci.append(-2.5, 2.7, 1.25) |
| 48 | ci.append(-1.5, 2.7, 0.1) |
| 49 | ci.append(1.5, 2.7, -0.6) |
| 50 | ci.append(2.5, 2.7, 0.2) |
| 51 | c.append(ci) |
| 52 | # |
| 53 | return c |
| 54 | |
| 55 | ctlpoints = make_ctlpoints() |
| 56 | |
| 57 | trimknots = [0., 0., 0., 1., 1., 2., 2., 3., 3., 4., 4., 4.] |
| 58 | |
| 59 | def make_trimpoints(): |
| 60 | c = [] |
| 61 | c.append(1.0, 0.0, 1.0) |
| 62 | c.append(1.0, 1.0, 1.0) |
| 63 | c.append(0.0, 2.0, 2.0) |
| 64 | c.append(-1.0, 1.0, 1.0) |
| 65 | c.append(-1.0, 0.0, 1.0) |
| 66 | c.append(-1.0, -1.0, 1.0) |
| 67 | c.append(0.0, -2.0, 2.0) |
| 68 | c.append(1.0, -1.0, 1.0) |
| 69 | c.append(1.0, 0.0, 1.0) |
| 70 | return c |
| 71 | |
| 72 | trimpoints = make_trimpoints() |
| 73 | |
| 74 | def main(): |
| 75 | init_windows() |
| 76 | setup_queue() |
| 77 | make_lights() |
| 78 | init_view() |
| 79 | # |
| 80 | set_scene() |
| 81 | setnurbsproperty( N_ERRORCHECKING, 1.0 ) |
| 82 | setnurbsproperty( N_PIXEL_TOLERANCE, 50.0 ) |
| 83 | trim_flag = 0 |
| 84 | draw_trim_surface(trim_flag) |
| 85 | # |
| 86 | while 1: |
| 87 | while qtest(): |
| 88 | dev, val = qread() |
| 89 | if dev == ESCKEY: |
| 90 | return |
| 91 | elif dev == WINQUIT: |
| 92 | dglclose(-1) # this for DGL only |
| 93 | return |
| 94 | elif dev == REDRAW: |
| 95 | reshapeviewport() |
| 96 | set_scene() |
| 97 | draw_trim_surface(trim_flag) |
| 98 | elif dev == LEFTMOUSE: |
| 99 | if val: |
| 100 | trim_flag = (not trim_flag) |
| 101 | set_scene() |
| 102 | draw_trim_surface(trim_flag) |
| 103 | |
| 104 | def init_windows(): |
| 105 | foreground() |
| 106 | #prefposition(0, 500, 0, 500) |
| 107 | wid = winopen('nurbs') |
| 108 | wintitle('NURBS Surface') |
| 109 | doublebuffer() |
| 110 | RGBmode() |
| 111 | gconfig() |
| 112 | lsetdepth(0x000, 0x7fffff) |
| 113 | zbuffer( TRUE ) |
| 114 | |
| 115 | def setup_queue(): |
| 116 | qdevice(ESCKEY) |
| 117 | qdevice(REDRAW) |
| 118 | qdevice(RIGHTMOUSE) |
| 119 | qdevice(WINQUIT) |
| 120 | qdevice(LEFTMOUSE) #trimming |
| 121 | |
| 122 | def init_view(): |
| 123 | mmode(MPROJECTION) |
| 124 | ortho( -4., 4., -4., 4., -4., 4. ) |
| 125 | # |
| 126 | mmode(MVIEWING) |
| 127 | loadmatrix(idmat) |
| 128 | # |
| 129 | lmbind(MATERIAL, 1) |
| 130 | |
| 131 | def set_scene(): |
| 132 | lmbind(MATERIAL, 0) |
| 133 | RGBcolor(150,150,150) |
| 134 | lmbind(MATERIAL, 1) |
| 135 | clear() |
| 136 | zclear() |
| 137 | # |
| 138 | rotate( 100, 'y' ) |
| 139 | rotate( 100, 'z' ) |
| 140 | |
| 141 | def draw_trim_surface(trim_flag): |
| 142 | bgnsurface() |
| 143 | nurbssurface(surfknots, surfknots, ctlpoints, ORDER, ORDER, N_XYZ) |
| 144 | if trim_flag: |
| 145 | bgntrim() |
| 146 | nurbscurve(trimknots, trimpoints, ORDER-1, N_STW) |
| 147 | endtrim() |
| 148 | endsurface() |
| 149 | swapbuffers() |
| 150 | |
| 151 | def make_lights(): |
| 152 | lmdef(DEFLMODEL,1,[]) |
| 153 | lmdef(DEFLIGHT,1,[]) |
| 154 | # |
| 155 | # define material #1 |
| 156 | # |
| 157 | a = [] |
| 158 | a = a + [EMISSION, 0.0, 0.0, 0.0] |
| 159 | a = a + [AMBIENT, 0.1, 0.1, 0.1] |
| 160 | a = a + [DIFFUSE, 0.6, 0.3, 0.3] |
| 161 | a = a + [SPECULAR, 0.0, 0.6, 0.0] |
| 162 | a = a + [SHININESS, 2.0] |
| 163 | a = a + [LMNULL] |
| 164 | lmdef(DEFMATERIAL, 1, a) |
| 165 | # |
| 166 | # turn on lighting |
| 167 | # |
| 168 | lmbind(LIGHT0, 1) |
| 169 | lmbind(LMODEL, 1) |
| 170 | |
| 171 | main() |