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

angle0 = 0
angle1 = 90
angle2 = 0
prevTime = time.time()

def drawPlanet(radius, color):
	glColor3fv(color)
	glBegin(GL_QUADS)
	glVertex2f(-radius, -radius)
	glVertex2f(radius, -radius)
	glVertex2f(radius, radius)
	glVertex2f(-radius, radius)
	glEnd()
	
def draw():
	global angle0
	glLoadIdentity()
	glClear(GL_COLOR_BUFFER_BIT)

	drawPlanet(0.2, [0, 0, 1])

	glPushMatrix()
	glRotatef(angle0, 1, 0, 0)
	glTranslatef(0.6, 0.0, 0.0)
	drawPlanet(0.1, [1, 0, 0])
	glPopMatrix()

	glPushMatrix()

	glRotatef(angle1, 0, 1, 0)
	glTranslatef(0.7, 0.0, 0.0)
	drawPlanet(0.08, [1, 1, 0])

	glPushMatrix()
	glRotatef(angle2, 0, 0, 1)
	glTranslatef(0.2, 0.0, 0.0)
	drawPlanet(0.03, [0.25, 1, 0.25])
	glPopMatrix()

	glPopMatrix()

	glFlush()


def keyboard(key, x, y):
	if key == chr(27):
		sys.exit(0)

def update():
	global angle0, angle1, angle2
	global prevTime
	currentTime = time.time()
	deltaTime = currentTime - prevTime
	prevTime = currentTime
	angle0 = angle0 + 180 * deltaTime
	angle1 = angle1 + 90 * deltaTime
	angle2 = angle2 + 270 * deltaTime
	glutPostRedisplay()

glutInit(sys.argv)
glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB)
glutInitWindowSize(400, 400)
glutInitWindowPosition(0,0)
glutCreateWindow(sys.argv[0])
glutDisplayFunc(draw)
glutKeyboardFunc(keyboard)
glutIdleFunc(update)
glutMainLoop()