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#!
# This is statement is required by the build system to query build info
if __name__ == '__build__':
raise Exception
import string
__version__ = string.split('$Revision: 1.5 $')[1]
__date__ = string.join(string.split('$Date: 2001/08/30 19:17:17 $')[1:3], ' ')
__author__ = 'Tarn Weisner Burton <twburton@users.sourceforge.net>'
import sys
try:
from Numeric import *
except:
print "This Demo requires the Numeric extension, sorry."
sys.exit()
from OpenGL.GL import *
from OpenGL.Tk import *
n, dt = 2000, 0.01
x, y, z = 0.01, 0.01, 0.01
frac = -1.0 * (8.0/3.0)
a = array((n,3), 'd')
def lorentz(o, x, y, z, n=2000, dt=0.01):
"""Generate Lorentz attractor. Put graphic in a graphical object"""
o.grob = glGenLists(10);
glNewList(o.grob, GL_COMPILE);
glDisable(GL_LIGHTING)
glBegin(GL_LINE_STRIP)
glVertex3f(x, y, z)
frac = -1.0 * (8.0/3.0)
for i in range(0, n):
xp = x + (-10.0 * x * dt + 10.0 * y * dt)
yp = y + ( 28.0 * x * dt - y * dt - x * dt * z *dt)
zp = z + ( frac * z * dt + x * dt * y * dt)
x=xp
y=yp
z=zp
glVertex3f(x, y, z)
glEnd()
glEnable(GL_LIGHTING)
glEndList()
def redraw(o):
"""The main scene redraw function."""
# Clear the background and depth buffer.
glClearColor(1., 0., 1., 0.)
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)
glColor3f(1., 1., 1.)
glCallList(o.grob)
#
# Demo starts here really.
import Tkinter, sys
# Create the opengl widget here.
o = Opengl(None, width = 400, height = 400, double = 1)
# Register the redraw procedure for the widget.
o.redraw = redraw
o.pack(side = 'top', expand = 1, fill = 'both')
o.set_centerpoint(0., 0., 2000.)
o.set_eyepoint(13000.)
o.far = 15000.
lorentz(o, 0.01, 0.01, 0.01)
# Enter the tk mainloop.
Tkinter.mainloop()
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