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

cameraPos = [0, 0, 0]
upX = 0

def draw():
	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)

	glMatrixMode(GL_PROJECTION)
	glLoadIdentity()
	gluPerspective(60, 1, 0.1, 1000)
	glMatrixMode(GL_MODELVIEW)

	global cameraPos, upX
	glLoadIdentity()
	gluLookAt(cameraPos[0], cameraPos[1], cameraPos[2],
		  0, 0, 0,
		  upX, 1, 0)

	drawObjects()

	glutSwapBuffers()


def drawObjects():
	global cameraPos
	glColor3f(0, 0.5, 0)
	glBegin(GL_QUADS)
	glVertex3f(-100, -3, -100)
	glVertex3f(100, -3, -100)
	glVertex3f(100, -3, 100)
	glVertex3f(-100, -3, 100)
	glEnd()

	glColor3f(0, 0, 1)
	glPushMatrix()
	glTranslatef(cameraPos[0], cameraPos[1], cameraPos[2])
	glRotatef(-90, 1, 0, 0)
	glutWireCone(1, 5, 8, 1)
	glPopMatrix()

	glColor3f(0.8, 0, 0.3)
	glPushMatrix()
	glTranslatef(-10, -3, -20)
	glRotatef(-90, 1, 0, 0)
	glutWireCone(1, 5, 8, 1)
	glPopMatrix()

	glColor3f(0.5, 0.3, 0.7)
	glPushMatrix()
	glTranslatef(10, -3, -10)
	glRotatef(-90, 1, 0, 0)
	glutWireCone(1, 5, 8, 1)
	glPopMatrix()


def keyboard(key, x, y):
	global upX
	if key == chr(27):
		sys.exit(0)
	elif key == ',':
		upX = upX - 0.1
	elif key == '.':
		upX = upX + 0.1
	glutPostRedisplay()

def specialKey(key, x, y):
	global cameraPos
	if key == GLUT_KEY_LEFT:
		cameraPos[0] = cameraPos[0] - 0.5
		glutPostRedisplay()
	elif key == GLUT_KEY_RIGHT:
		cameraPos[0] = cameraPos[0] + 0.5
		glutPostRedisplay()
	elif key == GLUT_KEY_UP:
		cameraPos[2] = cameraPos[2] - 0.5
		glutPostRedisplay()
	elif key == GLUT_KEY_DOWN:
		cameraPos[2] = cameraPos[2] + 0.5
		glutPostRedisplay()

glutInit(sys.argv)
glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH)
glutInitWindowSize(400, 400)
glutInitWindowPosition(0,0)
glutCreateWindow(sys.argv[0])
glutDisplayFunc(draw)
glutKeyboardFunc(keyboard)
glutSpecialFunc(specialKey)
glEnable(GL_DEPTH_TEST)
glLineWidth(3)
glutMainLoop()