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

delay = 0
x = 0
y = 0
quadric = 0

def draw():
    glClear(GL_COLOR_BUFFER_BIT)

    global x,y, quadric
    glLoadIdentity()
    glColor3f(1,1,1)
    glRasterPos2f(0,-20)
    drawBitmapString('Delay: %d' % (delay))
    glTranslatef(x, y, 0)
    glColor3f(1, 1, 0)
    gluDisk(quadric, 0, 10, 6, 6)

    glutSwapBuffers()


def drawBitmapString(text, font=GLUT_BITMAP_TIMES_ROMAN_24):
    for c in text:
        glutBitmapCharacter(font, ord(c))


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):
    if key == chr(27):
        sys.exit(0)

def specialKey(key, x, y):
    global delay
    if key == GLUT_KEY_UP:
        delay += 10
    elif key == GLUT_KEY_DOWN:
        if delay >= 10: delay -= 10
    glutPostRedisplay()

def callDraw(i):
    global x,y
    x = i % 10000
    y = -i / 10000
    draw()

def mousemotion(mx,my):
    global delay
    glutTimerFunc(delay, callDraw, mx + my*10000)


glutInit(sys.argv)
if len(sys.argv) > 1:
    delay = string.atof(sys.argv[1])
glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB)
glutInitWindowSize(400, 400)
glutInitWindowPosition(0,0)
glutCreateWindow(sys.argv[0])
glutDisplayFunc(draw)
glutKeyboardFunc(keyboard)
glutSpecialFunc(specialKey)
glutPassiveMotionFunc(mousemotion)
glutReshapeFunc(reshape)
quadric = gluNewQuadric()
reshape(400,400)
glutMainLoop()