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

triPosX = 0
triPosY = 0
triDX = 1
triDY = 1
triRot = 0

def draw():
    glClear(GL_COLOR_BUFFER_BIT)

    glMatrixMode(GL_PROJECTION)
    glLoadIdentity()
    gluOrtho2D(-15, 15, -10, 10)
    glMatrixMode(GL_MODELVIEW)

    glLoadIdentity()
    glTranslatef(triPosX, triPosY, 0)
    glRotatef(triRot, 0, 0, 1)

    glColor3f(1, 0, 0.7)
    glBegin(GL_TRIANGLES)
    glVertex2f(-1.0, -1.0)
    glVertex2f(1.0, -1.0)
    glVertex2f(0.0, 1.0)
    glEnd()

    glutSwapBuffers()

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

def update(dummy):
    global triPosX, triPosY, triDX, triDY, triRot
    glutTimerFunc(33, update, 0)

    if triPosX < -15:
        triDX = 1
    elif triPosX > 15:
        triDX = -1
    if triPosY < -10:
        triDY = 1
    elif triPosY > 10:
        triDY = -1

    triPosX += triDX * 0.2
    triPosY += triDY * 0.2
    triRot += 2
    glutPostRedisplay()

glutInit([])
glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB)
glutInitWindowSize(600, 400)
glutInitWindowPosition(0,0)
glutCreateWindow(sys.argv[0])
glutDisplayFunc(draw)
glutKeyboardFunc(keyboard)
glutTimerFunc(33, update, 0)
glutMainLoop()