cpython/Demo/sgi/gl/kunst.py

#!/ufs/guido/bin/sgi/python
# Simulate the artwork in the hall.
# Jack Jansen, Feb 91.
#
# Please please please don't try to read this code.
# It is the first GL program I ever wrote, and used to do
# very different things before it's current function:-)
from gl import *
from GL import *
from math import *
from DEVICE import *
import sys
import __main__
main_dict = __main__.__dict__

SPOTDIRECTION = 103
SPOTLIGHT = 104

#
# Make a cylinder paralel with the Z axis with center (X,Y,0)
# and radius 1
def mkcyl(nslice, nparts, docircle):
	cyl = []
	step = 2.0 / float(nslice)
	z = -1.0
	for i in range(nslice):
	    cyl.append(mkslice(z, z+step, nparts, docircle))
	    z = z + step
	return drawcylinder(cyl)
#
# Make one part of a cylinder
#
def mkslice(z1, z2, nparts, docircle):
	if docircle:
	    w1 = z1
	    w2 = z2
	    w1 = sqrt(1.0-w1*w1)
	    w2 = sqrt(1.0-w2*w2)
	    normalz = 1.0
	else:
	    w1 = 1.0
	    w2 = 1.0
	    normalz = 0.0
	slice = []
	step = (2.0*pi)/float(nparts)
	angle = 0.0
	for i in range(nparts+1):
	    vx = cos(angle)
	    vy = sin(angle)
	    slice.append( ((vx*w1,vy*w1,z1), (vx*w1, vy*w1, z1*normalz)) )
	    slice.append( ((vx*w2,vy*w2,z2), (vx*w2, vy*w2, z2*normalz)) )
	    angle = angle + step
	return slice
#
# Drawcylinder : draw the cylinder
#
class struct(): pass
curobj = struct()
curobj.curobj = 1
def drawcylinder(cyl):
	obj = curobj.curobj
	curobj.curobj = curobj.curobj+1
	makeobj(obj)
	for slice in cyl:
	    bgntmesh()
	    vnarray(slice)
	    endtmesh()
	closeobj()
	return obj
#
def drawnormals(cyl):
	for slice in cyl:
	    for triang in slice:
		bgnline()
		v3f(triang[0])
		v3f(triang[0][0] + triang[1][0], triang[0][1] + triang[1][1], triang[0][2] + triang[1][2])
		endline()
def drawfloors():
	obj = curobj.curobj
	curobj.curobj = curobj.curobj+1
	makeobj(obj)
	bgnpolygon()
	v3i(4,6,-6)
	v3i(-6,6,-6)
	v3i(-6,-6,-6)
	v3i(4,-6,-6)
	endpolygon()
	for floor in range(3):
	    pos = -1 + 5*floor
	    bgnpolygon()
	    v3i(4,4,pos)
	    v3i(-6,4,pos)
	    v3i(-6,6,pos)
	    v3i(4,6,pos)
	    endpolygon()
	    bgnpolygon()
	    v3i(-4,4,pos)
	    v3i(-4,-4,pos)
	    v3i(-6,-4,pos)
	    v3i(-6,4,pos)
	    endpolygon()
	    bgnpolygon()
	    v3i(-6,-4,pos)
	    v3i(-6,-6,pos)
	    v3i(4,-6,pos)
	    v3i(4,-4,pos)
	    endpolygon()
	closeobj()
	return obj
def drawdoors():
	obj = curobj.curobj
	curobj.curobj = curobj.curobj+1
	makeobj(obj)
	for floor in range(3):
	    pos = -1+5*floor
	    bgnpolygon()
	    v3i(-2,6,pos)
	    v3i(-2,6,pos+3)
	    v3i(0,6,pos+3)
	    v3i(0,6,pos)
	    endpolygon()
	closeobj()
	return obj
def drawrailing():
	obj = curobj.curobj
	curobj.curobj = curobj.curobj+1
	makeobj(obj)
	for floor in range(3):
	    pos = -1 + 5*floor
	    bgnpolygon()
	    v3i(4,4,pos)
	    v3i(4,4,pos-1)
	    v3i(-4,4,pos-1)
	    v3i(-4,4,pos)
	    endpolygon()
	    bgnpolygon()
	    v3i(-4,4,pos)
	    v3i(-4,4,pos-1)
	    v3i(-4,-4,pos-1)
	    v3i(-4,-4,pos)
	    endpolygon()
	    bgnpolygon()
	    v3i(-4,-4,pos)
	    v3i(-4,-4,pos-1)
	    v3i(4,-4,pos-1)
	    v3i(4,-4,pos)
	    endpolygon()
	closeobj()
	return obj
def drawwalls():
	obj = curobj.curobj
	curobj.curobj = curobj.curobj+1
	makeobj(obj)
	bgnpolygon()
	v3i(4,6,-6)
	v3i(4,6,18)
	v3i(-6,6,18)
	v3i(-6,6,-6)
	endpolygon()
	bgnpolygon()
	v3i(-6,6,-6)
	v3i(-6,6,18)
	v3i(-6,-6,18)
	v3i(-6,-6,-6)
	endpolygon()
	bgnpolygon()
	v3i(-6,-6,-6)
	v3i(-6,-6,18)
	v3i(4,-6,18)
	v3i(4,-6,-6)
	endpolygon()
	bgnpolygon()
	v3i(4,-6,-6)
	v3i(4,-6,18)
	v3i(4,4,18)
	v3i(4,4,-6)
	endpolygon()
	closeobj()
	return obj
def axis():
	bgnline()
	cpack(0xff0000)
	v3i(-1,0,0)
	v3i(1,0,0)
	v3f(1.0, 0.1, 0.1)
	endline()
	bgnline()
	cpack(0xff00)
	v3i(0,-1,0)
	v3i(0,1,0)
	v3f(0.1, 1.0, 0.1)
	endline()
	bgnline()
	cpack(0xff)
	v3i(0,0,-1)
	v3i(0,0,1)
	v3f(0.1,0.1,1.0)
	endline()
#
silver = [ DIFFUSE, 0.3, 0.3, 0.3, SPECULAR, 0.9, 0.9, 0.95, \
	SHININESS, 40.0, LMNULL]
floormat = [ AMBIENT, 0.5, 0.25, 0.15, DIFFUSE, 0.5, 0.25, 0.15, SPECULAR, 0.6, 0.3, 0.2, SHININESS, 20.0, LMNULL]
wallmat = [ DIFFUSE, 0.4, 0.2, 0.1, AMBIENT, 0.4, 0.20, 0.10, SPECULAR, 0.0, 0.0, 0.0, SHININESS, 20.0, LMNULL]
offwhite = [ DIFFUSE, 0.8, 0.8, 0.6, AMBIENT, 0.8, 0.8, 0.6, SPECULAR, 0.9, 0.9, 0.9, SHININESS, 30.0, LMNULL]
doormat = [ DIFFUSE, 0.1, 0.2, 0.5, AMBIENT, 0.2, 0.4, 1.0, SPECULAR, 0.2, 0.4, 1.0, SHININESS, 60.0, LMNULL]

toplight = [ LCOLOR, 1.0, 1.0, 0.5, \
	POSITION, 0.0, 0.0, 11.0, 1.0, LMNULL]
floor1light = [ LCOLOR, 1.0, 1.0, 1.0, POSITION, 3.9, -3.9, 0.0, 1.0, \
	SPOTDIRECTION, 1.0, 1.0, 0.0, SPOTLIGHT, 10.0, 90.0, LMNULL]

lmodel = [ AMBIENT, 0.92, 0.8, 0.5, LOCALVIEWER, 1.0, LMNULL]
#
def lighting():
	INDIGO=1	# XXXX Seems indigo only has one light.
	lmdef(DEFMATERIAL, 2, silver)
	lmdef(DEFMATERIAL, 3, floormat)
	lmdef(DEFMATERIAL, 4, wallmat)
	lmdef(DEFMATERIAL, 5, offwhite)
	lmdef(DEFMATERIAL, 6, doormat)
	lmdef(DEFLIGHT, 1, toplight)
	if not INDIGO:
	    lmdef(DEFLIGHT, 2, floor1light)
	lmdef(DEFLMODEL, 1, lmodel)
	lmbind(LIGHT0, 1)
	if not INDIGO:
	    lmbind(LIGHT1, 2)
	lmbind(LMODEL, 1)
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]
#
wrongrange='Wrong Range'
def defun(axis):
	done = 0
	res = 0.0	# Hack around exec(...)
	while not done:
	    print 'F'+axis+'(t) = ',
	    s = sys.stdin.readline(100)
	    print
	    try:
		s = 'def f'+axis+'(t): return '+s
		exec(s, main_dict)
		exec('res = f'+axis+'(0.0)\n')
		if res < -10.0 or res > 10.0:
			raise wrongrange
		exec('res = f'+axis+'(100.0)\n')
		if res < -10.0 or res > 10.0:
			raise wrongrange
		done = 1
	    except RuntimeError:
		print 'Sorry, there is a syntax error in your expression'
	    except TypeError:
		print 'Please remember to use floating point numbers'
	    except wrongrange:
		print 'Sorry, function values out of range (non-periodic function?)'
def getfunctions():
	print 'Welcome to the CWI art simulator. You can now enter X, Y and Z'
	print 'coordinates as a function of t.'
	print 'Alternatively, you can specify the name of a python module'
	print 'defining functions fx(t), fy(t) and fz(t) on the command line'
	print 'Normal trig functions are available. Please use floating point'
	print 'values only (so 0.0 for 0). Comments to jack@cwi.nl'
	defun('x')
	defun('y')
	defun('z')
	print 'Ok, here you go. Use mouse+right button to move up/down,'
	print 'mouse+middle to speed up/slow down time. type ESC to quit simulation'
def main():
	if len(sys.argv) > 1:
	    exec('from '+sys.argv[1]+' import *\n')
	else:
	    getfunctions()
	foreground()
	prefposition(100,600,100,600)
	void = winopen('cyl')
	qdevice(ESCKEY)
	qdevice(MOUSE1)
	qdevice(MOUSE2)
	qdevice(PKEY)
	RGBmode()
	doublebuffer()
	gconfig()
	zbuffer(1)
	mmode(MVIEWING)
	perspective(600, 1.0, 0.01, 20.0)
	loadmatrix(IdMat)
	vx = 0.0
	vy = -3.9
	vz = 0.0
	lookat(0.0, -3.9, 0.0, 0.0, 0.0, 0.0, 0)
	lighting()
	t = -1.0
	step = 0.2
	bol = mkcyl(12,24, 1)
	cable = mkcyl(1, 6, 0)
	floors = drawfloors()
	walls = drawwalls()
	pillar = mkcyl(1,4,0)
	railing = drawrailing()
	doors = drawdoors()
	shademodel(GOURAUD)
	mousing = -1
	pausing = 0
	while 1:
	    #
	    # Check for some user input
	    #
	    if qtest():
		dev, value = qread()
		if dev == PKEY and value == 1:
			pausing = 1
		if dev == ESCKEY:
		    break
		elif (dev==MOUSE1 or dev==MOUSE2) and value == 1:
		    if mousing > 0:
			vx = 0.0
			vy = -3.9
			vz = 0.0
		    mousing = dev
		    oldx = getvaluator(MOUSEX)
		    oldy = getvaluator(MOUSEY)
		elif (dev==MOUSE1 or dev==MOUSE2):
		    mousing = -1
	    if mousing >= 0:
		newx = getvaluator(MOUSEX)
		newy = getvaluator(MOUSEY)
		if newy <> oldy and mousing==MOUSE1:
		    vz = vz + float(newy - oldy)/100.0
		    if vz < -5.99:
			vz = -5.99
		    dist = sqrt(vx*vx + vy*vy + vz*vz)
		    perspective(600, 1.0, 0.01, dist+16.0)
		    loadmatrix(IdMat)
		    if vz < 0.0:
			lookat(vx, vy, vz, 0.0, 0.0, 0.0, 1800)
		    else:
			lookat(vx, vy, vz, 0.0, 0.0, 0.0, 0)
		if newy <> oldy and mousing==MOUSE2:
		    step = step * exp(float(newy-oldy)/400.0)
	    if getbutton(CTRLKEY) == 0:
		t = t + step
	    else:
		t = t - step
	    if getbutton(LEFTSHIFTKEY) == 0:
		shademodel(GOURAUD)
	    else:
		shademodel(FLAT)
	    #
	    # Draw background and axis
	    czclear(0x802020,getgdesc(GD_ZMAX))
	    #axis()
	    #
	    # draw the floors
	    #
	    lmbind(MATERIAL, 3)
	    callobj(floors)
	    lmbind(MATERIAL, 4)
	    callobj(walls)
	    lmbind(MATERIAL, 5)
	    pushmatrix()
	    translate(-4.5,4.5,3.0)
	    scale(0.2,0.2,9.0)
	    rotate(450,'z')
	    callobj(pillar)
	    popmatrix()
	    callobj(railing)
	    lmbind(MATERIAL, 6)
	    pushmatrix()
	    translate(0.0, -0.01, 0.0)
	    callobj(doors)
	    popmatrix()
	    #
	    # Draw object
	    #
	    bolx = fx(t)
	    boly = fy(t)
	    bolz = fz(t)
	    err = ''
	    if bolx < -4.0 or bolx > 4.0:
		err = 'X('+`bolx`+') out of range [-4,4]'
	    if boly < -4.0 or boly > 4.0:
		err = 'Y('+`boly`+') out of range [-4,4]'
	    if bolz < -4.0 or bolz > 8.0:
		err = 'Z('+`bolz`+') out of range [-4,8]'
	    if not err:
		pushmatrix()
		translate(bolx, boly, bolz)
		scale(0.3, 0.3, 0.3)
		lmbind(MATERIAL, 2)
		blendfunction(BF_ONE, BF_ONE)
		callobj(bol)
		blendfunction(BF_ONE, BF_ZERO)
		popmatrix()
		#
		# Draw the cables
		#
		bolz = bolz + 0.3
		pushmatrix()
		#linesmooth(SML_ON)
		bgnline()
		v3i(-4,-4,9)
		v3f(bolx, boly, bolz)
		endline()
		bgnline()
		v3i(-4,4,9)
		v3f(bolx, boly, bolz)
		endline()
		bgnline()
		v3i(4,-4,9)
		v3f(bolx, boly, bolz)
		endline()
		bgnline()
		v3i(4,4,9)
		v3f(bolx, boly, bolz)
		endline()
		popmatrix()
	    if mousing == MOUSE2 or err:
		cpack(0xff0000)
		cmov(0.0, 0.0, 0.4)
		charstr('t='+`t`)
	    if mousing == MOUSE2:
		cpack(0xff0000)
		cmov(0.0, 0.0, 0.2)
		charstr('delta-t='+`step`)
	    if err:
		cpack(0xff00)
		cmov(0.0, 0.0, 0.2)
		charstr(err)
		pausing = 1
	    if pausing:
		cpack(0xff00)
		cmov(0.0, 0.0, 0.0)
		charstr('Pausing, type P to continue')
	    swapbuffers()
	    if pausing:
		while 1:
		    dv=qread()
		    if dv==(PKEY,1):
			break
		    if dv==(ESCKEY,1):
			sys.exit(0)
		pausing = 0
#
try:
    main()
except KeyboardInterrupt:
    sys.exit(1)