# PyFunc.py
# Plotting functions

from OpenGL.GL import *
from OpenGL.GLU import *
from OpenGL.GLUT import *
from numpy import *
import sys

def init():
	glClearColor(1.0, 1.0, 1.0, 1.0)
	gluOrtho2D(-5.0, 5.0, -5.0, 5.0)

def plotfunc():
	glClear(GL_COLOR_BUFFER_BIT)
	glColor3f(0.0, 0.0, 0.0)
	glPointSize(1.0)
	
	glBegin(GL_POINTS)
	for x in arange(-5.0, 5.0, 0.01):
		y = x*x
		glColor3f(0.0, 0.0, 0.0)
		glVertex2f(x,y)
		for a in arange(-5.0, 5.0, 0.01):
			if a < x*x:
				glColor3f(0.50,0.50,0.50)
				glVertex2f(x,a)
	glEnd()
	
	glColor3f(0.0, 0.0, 0.0)
	glBegin(GL_LINES)
	glVertex2f(-5.0, 0.0)
	glVertex2f(5.0, 0.0)
	glVertex2f(0.0, 5.0)
	glVertex2f(0.0, -5.0)
	glEnd()
	
	glFlush()


def main():
	glutInit(sys.argv)
	glutInitDisplayMode(GLUT_SINGLE|GLUT_RGB)
	glutInitWindowPosition(50,50)
	glutInitWindowSize(400,400)
	glutCreateWindow("Function Plotter")
	glutDisplayFunc(plotfunc)
	
	init()
	glutMainLoop()

main()