import sys, math, time, string
from OpenGL.GLUT import *
from OpenGL.GL import *
from OpenGL.GLU import *

quadric = 0
color = [1, 0, 0]
firstTime = 1

def draw():
	global firstTime
	if firstTime:
		glClear(GL_COLOR_BUFFER_BIT)
		glFlush()
	firstTime = 0


def reshape(width, height):
	glViewport(0, 0, width, height)
	glMatrixMode(GL_PROJECTION)
	glLoadIdentity()
	gluOrtho2D(0, width, -height, 0)
	glMatrixMode(GL_MODELVIEW)


def keyboard(key, x, y):
	global color
	if key == chr(27):
		sys.exit(0)
	elif key == 'r':
		color = [1,0,0]
	elif key == 'g':
		color = [0,1,0]
	elif key == 'b':
		color = [0,0,1]

def mousemotion(x,y):
	global quadric, color
	glLoadIdentity()
	glTranslatef(x, -y, 0)
	glColor3fv(color)
	gluDisk(quadric, 0, 10, 12, 1)
	glFlush()


glutInit(sys.argv)
glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB)
glutInitWindowSize(400, 400)
glutInitWindowPosition(0,0)
glutCreateWindow(sys.argv[0])
glutDisplayFunc(draw)
glutKeyboardFunc(keyboard)
glutMotionFunc(mousemotion)
glutReshapeFunc(reshape)
quadric = gluNewQuadric()
reshape(400,400)
glutMainLoop()