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

angle = 0
prevTime = time.time()

def draw():
	global angle
	glLoadIdentity()
	glClear(GL_COLOR_BUFFER_BIT)

	glRotatef(angle, 0, 0, 1)

	glBegin(GL_TRIANGLES)
	for i in range(0,200):
		for j in range(0,200):
			x = i / 100.0 - 1.0
			y = j / 100.0 - 1.0
			glColor3f(i*j/40000.0, 1, 1)
			glVertex2f(x, y)
			glVertex2f(x+0.1, y)
			glVertex2f(x+0.05, y+0.1)
	glEnd()

	glutSwapBuffers()


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

def update():
	global angle
	global prevTime
	currentTime = time.time()
	deltaTime = currentTime - prevTime
	prevTime = currentTime
	angle = angle + 90 * deltaTime
	glutPostRedisplay()

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