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

viewRotY = 0
viewRotX = 0
cameraVelX = 0
cameraVelY = 0
prevTime = time.time()

if len(sys.argv) > 1:
    object = WFObject(sys.argv[1])
else:
    object = WFObject('cow.obj')

def draw():
	glClearColor(0, 0.3, 0.5, 0)
	glClear(GL_COLOR_BUFFER_BIT)
	
	glMatrixMode(GL_PROJECTION)
	glLoadIdentity()
	glOrtho(-10,10, -10,10, -10,10)
	glMatrixMode(GL_MODELVIEW)

	glLoadIdentity()
	glRotatef(viewRotX, 1.0, 0.0, 0.0)
	glRotatef(viewRotY, 0.0, 1.0, 0.0)
	
	object.draw()

	glutSwapBuffers()


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

def specialkey(key,x,y):
	global cameraVelX, cameraVelY
	if key == GLUT_KEY_LEFT:
	    cameraVelY += 90
	elif key == GLUT_KEY_RIGHT:
	    cameraVelY -= 90
	elif key == GLUT_KEY_UP:
	    cameraVelX += 90
	elif key == GLUT_KEY_DOWN:
	    cameraVelX -= 90

def specialkeyUp(key,x,y):
	global cameraVelX, cameraVelY
	if key == GLUT_KEY_LEFT:
	    cameraVelY -= 90
	elif key == GLUT_KEY_RIGHT:
	    cameraVelY += 90
	elif key == GLUT_KEY_UP:
	    cameraVelX -= 90
	elif key == GLUT_KEY_DOWN:
	    cameraVelX += 90

def update():
	global viewRotX, viewRotY, cameraVelX, cameraVelY
	global prevTime
	t = time.time()
	dt = t - prevTime
	prevTime = t
	viewRotX += cameraVelX * dt
	viewRotY += cameraVelY * dt
	glutPostRedisplay()

glutInit([])
glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE)
glutInitWindowSize(400,400)
glutCreateWindow(sys.argv[0])
glutDisplayFunc(draw)
glutKeyboardFunc(keyboard)
glutSpecialFunc(specialkey)
glutSpecialUpFunc(specialkeyUp)
glutIgnoreKeyRepeat(1)
glutIdleFunc(update)
glutMainLoop()