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

cameraPos = [0, 0, 0]
cameraVel = [0, 0, 0]
cameraHeading = 0
cameraHeadingSpeed = 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, cameraHeading
	glLoadIdentity()
	glRotatef(-cameraHeading, 0, 1, 0)
	glTranslatef(-cameraPos[0], -cameraPos[1], -cameraPos[2])

	drawObjects()

	glutSwapBuffers()


def drawObjects():
	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(0, -3, -5)
	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 cameraHeading, cameraVel, cameraHeadingSpeed
	if key == chr(27):
		sys.exit(0)
	elif key == ',':
		cameraHeadingSpeed = cameraHeadingSpeed + 2
	elif key == '.':
		cameraHeadingSpeed = cameraHeadingSpeed - 2
	elif key == ' ':
		cameraVel = [0, 0, 0]

def specialKey(key, x, y):
	global cameraVel
	if key == GLUT_KEY_LEFT:
		cameraVel[0] = cameraVel[0] - 0.01
	elif key == GLUT_KEY_RIGHT:
		cameraVel[0] = cameraVel[0] + 0.01
	elif key == GLUT_KEY_UP:
		cameraVel[2] = cameraVel[2] - 0.01
	elif key == GLUT_KEY_DOWN:
		cameraVel[2] = cameraVel[2] + 0.01

import time
previousTime = time.time()

def update():
	global previousTime, cameraPos, cameraHeading
	t = time.time()
	frameTime = t - previousTime
	previousTime = t
	cameraPos[0] = cameraPos[0] + cameraVel[0] * frameTime
	cameraPos[1] = cameraPos[1] + cameraVel[1] * frameTime
	cameraPos[2] = cameraPos[2] + cameraVel[2] * frameTime
	cameraHeading = cameraHeading + cameraHeadingSpeed * frameTime
	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)
glutIdleFunc(update)
glEnable(GL_DEPTH_TEST)
glLineWidth(3)
glutMainLoop()