#!/usr/bin/python
from OpenGL.GLUT import *
from OpenGL.GLU import *
from OpenGL.GL import *

name = "Hello, World"
height = 400
width = 400
rotate = 0
beginx = 0.
beginy = 0.
rotx = 0.
roty = 0.

def display():
    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT)
    glLoadIdentity()
    gluLookAt(0,0,10,0,0,0,0,1,0)
    glRotatef(roty,0,1,0)
    glRotatef(rotx,1,0,0)
    glCallList(1)
    glutSwapBuffers()
    return

def mouse(button,state,x,y):
    global beginx,beginy,rotate
    if button == GLUT_LEFT_BUTTON and state == GLUT_DOWN:
        rotate = 1
        beginx = x
        beginy = y
    if button == GLUT_LEFT_BUTTON and state == GLUT_UP:
        rotate = 0
    return

def motion(x,y):
    global rotx,roty,beginx,beginy,rotate
    if rotate:
        rotx = rotx + (y - beginy)
        roty = roty + (x - beginx)
        beginx = x
        beginy = y
        glutPostRedisplay()
    return

def keyboard():
    return

glutInit(name)
glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH)
glutInitWindowSize(height,width)
glutCreateWindow(name)
glClearColor(0.,0.,0.,1.)

# setup display list
glNewList(1,GL_COMPILE)
glPushMatrix()
glTranslatef(0.,1.,0.) #move to where we want to put object
glutSolidSphere(1.,20.,20.) # make radius 1 sphere of res 10x10
glPopMatrix()
glPushMatrix()
glTranslatef(0.,-1.,0.) #move to where we want to put object
glutSolidSphere(1.,20.,20.) # make radius 1 sphere of res 10x10
glPopMatrix()
glEndList()

#setup lighting
glEnable(GL_CULL_FACE)
glEnable(GL_DEPTH_TEST)
glEnable(GL_LIGHTING)
lightZeroPosition = [10.,4.,10.,1.]
lightZeroColor = [0.8,1.0,0.8,1.0] # greenish
glLightfv(GL_LIGHT0, GL_POSITION, lightZeroPosition)
glLightfv(GL_LIGHT0, GL_DIFFUSE, lightZeroColor)
glLightf(GL_LIGHT0, GL_CONSTANT_ATTENUATION, 0.1)
glLightf(GL_LIGHT0, GL_LINEAR_ATTENUATION, 0.05)
glEnable(GL_LIGHT0)

#setup cameras
glMatrixMode(GL_PROJECTION)
gluPerspective(40.,1.,1.,40.)
glMatrixMode(GL_MODELVIEW)
gluLookAt(0,0,10,0,0,0,0,1,0)
glPushMatrix()

#setup callbacks
glutSetDisplayFuncCallback(display)
glutDisplayFunc()
glutSetMouseFuncCallback(mouse)
glutMouseFunc()
glutSetMotionFuncCallback(motion)
glutMotionFunc()
glutSetKeyboardFuncCallback(keyboard)
glutKeyboardFunc()



glutMainLoop()