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PyExpJulia.py
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PyExpJulia.py
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# PyJulia.py
# Plot a Julia set
from OpenGL.GL import *
from OpenGL.GLU import *
from OpenGL.GLUT import *
from numpy import *
import sys
# If psyco isn't installed, delete the next two lines!
#import psyco
#psyco.full()
# Initalize screen dimensions and the screen origin
width = 200
height = 200
hcenter = 0.0
vcenter = 0.0
axrng = 2.0
hstep = 2*axrng/width
vstep = 2*axrng/height
def init():
# White background
glClearColor(1.0, 1.0, 1.0, 1.0)
# The next statement is all one line!!!
gluOrtho2D(hcenter-axrng,hcenter+axrng,vcenter- axrng,vcenter+axrng)
def drawjulia():
glClear(GL_COLOR_BUFFER_BIT)
glBegin(GL_POINTS)
# Julia set complex number
z = complex(-0.75, 0.05)
y = vcenter + axrng
while y > vcenter - axrng:
y-= vstep
x = hcenter - axrng
while x < hcenter + axrng:
x+= hstep
n = 0
a = complex(x,y)
# n < 100 is the number of iterations
# Increase this value to show finer detail
# Decrease the value if nothing shows on the screen
while n < 200:
n+=1
a = a**3 + z
zz = abs(a)
if zz > 2:
glColor3f(cos(zz),sin(zz)*cos(zz),sin(zz))
glVertex2f(x,y)
n = 5001
if zz < 200:
glColor3f(tan(zz),sin(zz),cos(n))
glVertex2f(x,y)
glEnd()
glFlush()
def main():
glutInitDisplayMode(GLUT_RGB | GLUT_SINGLE)
glutInitWindowPosition(50, 50)
glutInitWindowSize(width, height)
glutInit(sys.argv)
glutCreateWindow("Julia Set")
glutDisplayFunc(drawjulia)
init()
glutMainLoop()
main()
# End Program