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Diffstat (limited to 'Demo/sgi/gl/kites.py')
| -rwxr-xr-x | Demo/sgi/gl/kites.py | 194 |
1 files changed, 194 insertions, 0 deletions
diff --git a/Demo/sgi/gl/kites.py b/Demo/sgi/gl/kites.py new file mode 100755 index 0000000..d986833 --- /dev/null +++ b/Demo/sgi/gl/kites.py @@ -0,0 +1,194 @@ +#! /usr/local/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 () |