from pyglet.gl import *

window = pyglet.window.Window()

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

@window.event
def on_draw():
    glClear(GL_COLOR_BUFFER_BIT)

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

    glLoadIdentity()
    global triPosX, triPosY, triRot
    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()



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

    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


pyglet.clock.schedule_interval(update,1/60.0)
pyglet.app.run()