| #! /usr/bin/env python |
| |
| # *** This only works correctly on a 24 bit-plane machine. *** |
| # |
| # A simple Python program that tests the some parts of the |
| # GL library. It shows the speed that can be obtained when |
| # doing simple graphics. |
| # |
| # The bottleneck in this program is NOT Python but the graphics |
| # engine; i.e Python can feed the graphics pipeline fast enough |
| # on the 4D/25G. |
| # |
| # This program show 3 kites flying around the screen. It uses |
| # |
| # * bgnpolygon, endpolygon |
| # * v3, n3 |
| # * lmdef, lmbind |
| # |
| # Usage : |
| # |
| # ESC -> exit program |
| # MOUSE3 -> freeze toggle |
| # MOUSE2 -> one step (use this in freeze state) |
| |
| from GL import * |
| from gl import * |
| import DEVICE |
| from math import * |
| |
| # |
| # viewobj : sets the rotation, translation and scaling |
| # set appropiate material, call drawobject() |
| # |
| def viewobj (r, s, t, mat) : |
| pushmatrix() |
| rot (r * 10.0, 'X') |
| rot (r * 10.0, 'Y') |
| rot (r * 10.0, 'Z') |
| scale (s[0], s[1], s[2]) |
| translate (t[0], t[1], t[2]) |
| lmbind(MATERIAL, mat) |
| drawobject() |
| popmatrix() |
| |
| # |
| # makeobj : the contructor of the object |
| # |
| def mkobj () : |
| v0 = (-5.0 ,0.0, 0.0) |
| v1 = (0.0 ,5.0, 0.0) |
| v2 = (5.0 ,0.0, 0.0) |
| v3 = (0.0 ,2.0, 0.0) |
| n0 = (sqrt(2.0)/2.0, sqrt(2.0)/2.0, 0.0) |
| vn = ((v0, n0), (v1, n0), (v2, n0), (v3, n0)) |
| # |
| return vn |
| |
| # |
| # the object itself as an array of vertices and normals |
| # |
| kite = mkobj () |
| |
| # |
| # drawobject : draw a triangle. with bgnpolygon |
| # |
| def drawobject () : |
| # |
| bgnpolygon() |
| vnarray (kite) |
| endpolygon() |
| |
| # |
| # identity matrix |
| # |
| idmat=[1.0,0.0,0.0,0.0,0.0,1.0,0.0,0.0,0.0,0.0,1.0,0.0,0.0,0.0,0.0,1.0] |
| |
| # |
| # the rgb-value of light-blue |
| # |
| LightBlue = (43,169,255) |
| |
| # |
| # the different materials. |
| # |
| m1=[SPECULAR,0.0,0.0,0.6,DIFFUSE,0.0,0.0,0.8,SHININESS,20.0,LMNULL] |
| m2=[SPECULAR,0.8,0.0,0.1,DIFFUSE,0.8,0.0,0.3,SHININESS,120.0,LMNULL] |
| m3=[SPECULAR,0.0,1.0,0.0,DIFFUSE,0.0,0.6,0.0,SHININESS,120.0,LMNULL] |
| |
| # |
| # lightsources |
| # |
| light1 = [LCOLOR,1.0,1.0,1.0,POSITION,15.0,15.0,0.0,1.0,LMNULL] |
| light2 = [LCOLOR,1.0,1.0,1.0,POSITION,-15.0,15.0,0.0,1.0,LMNULL] |
| |
| # |
| # the lightmodel |
| # |
| model = [AMBIENT,0.2,0.2,0.2,LMNULL] |
| |
| # |
| # initgl : opens the window, configures the pipeline to 2buf and zbuf, |
| # sets the viewing, defines and binds the materials |
| # |
| def initgl () : |
| # |
| # open window |
| # |
| foreground () |
| keepaspect (1, 1) |
| prefposition (100, 500, 100, 500) |
| w = winopen ('PYTHON lights') |
| keepaspect (1, 1) |
| winconstraints() |
| # |
| # configure pipeline (zbuf, 2buf, GOURAUD and RGBmode) |
| # |
| zbuffer (1) |
| doublebuffer () |
| shademodel (GOURAUD) |
| RGBmode () |
| gconfig () |
| # |
| # define and bind materials (set perspective BEFORE loadmat !) |
| # |
| mmode(MVIEWING) |
| perspective (900, 1.0, 1.0, 20.0) |
| loadmatrix(idmat) |
| lmdef(DEFMATERIAL, 1, m1) |
| lmdef(DEFMATERIAL, 2, m2) |
| lmdef(DEFMATERIAL, 3, m3) |
| lmdef(DEFLIGHT, 1, light1) |
| lmdef(DEFLIGHT, 2, light2) |
| lmdef(DEFLMODEL, 1, model) |
| lmbind(LIGHT0,1) |
| lmbind(LIGHT1,2) |
| lmbind(LMODEL,1) |
| # |
| # set viewing |
| # |
| lookat (0.0, 0.0, 10.0, 0.0, 0.0, 0.0, 0) |
| # |
| # ask for the REDRAW and ESCKEY events |
| # |
| qdevice(DEVICE.MOUSE3) |
| qdevice(DEVICE.MOUSE2) |
| qdevice(DEVICE.REDRAW) |
| qdevice(DEVICE.ESCKEY) |
| |
| # |
| # GoForIT : use 2buf to redraw the object 2n times. index i is used as |
| # the (smoothly changing) rotation angle |
| # |
| def GoForIt(i) : |
| freeze = 1 |
| while 1 : |
| if freeze <> 0 : |
| i = i + 1 |
| # |
| # clear z-buffer and clear background to light-blue |
| # |
| zclear() |
| c3i (LightBlue) |
| clear() |
| # |
| # draw the 3 traiangles scaled above each other. |
| # |
| viewobj(float(i),[1.0,1.0,1.0],[1.0,1.0,1.0],1) |
| viewobj(float(i),[0.75,0.75,0.75],[0.0,2.0,2.0],2) |
| viewobj(float(i),[0.5,0.5,0.5],[0.0,4.0,4.0],3) |
| # |
| swapbuffers() |
| # |
| if qtest() <> 0 : |
| dev, val = qread() |
| if dev == DEVICE.ESCKEY : |
| break |
| elif dev == DEVICE.REDRAW : |
| reshapeviewport () |
| elif dev == DEVICE.MOUSE3 and val <> 0 : |
| freeze = 1 - freeze |
| elif dev == DEVICE.MOUSE2 and val <> 0 : |
| i = i + 1 |
| |
| |
| # the main program |
| # |
| def main () : |
| initgl () |
| GoForIt (0) |
| |
| # |
| # exec main |
| # |
| main () |