another glPushMatrix/glPopMatrix example

pushpop2.py

import sys, random, time, math
from pyglet.gl import *

window = pyglet.window.Window(500,500)

pos1 = [0,0]
pos2 = [0, 0]
pos3 = [0, 0]
pos4 = [0, 0]
heading1 = 0
heading2 = 0
heading3 = 0
heading4 = 0

@window.event
def on_draw():
    glClear(GL_COLOR_BUFFER_BIT)
    glMatrixMode(GL_PROJECTION)
    glLoadIdentity()
    glMatrixMode(GL_MODELVIEW)
    glLoadIdentity()

    drawBackground()

  # First triangle
    glPushMatrix()
    glColor3f(1,0,0)
    glTranslatef(pos1[0], pos1[1], 0)
    glRotatef(heading1, 0, 0, 1)
    drawTriangle()
    glPopMatrix()

  # Second triangle
    glPushMatrix()
    glColor3f(0,1,0)
    glTranslatef(pos2[0], pos2[1], 0)
    glRotatef(heading2, 0, 0, 1)
    drawTriangle()

  # First orbiter
    glPushMatrix()
    glColor3f(1,1,1)
    glTranslatef(pos3[0], pos3[1], 0)
    glRotatef(heading3, 0, 0, 1)
    glScalef(0.3, 0.3, 0.3)
    drawSquare()
    glPopMatrix()

  # Second orbiter
    glPushMatrix()
    glColor3f(1,1,0)
    glTranslatef(pos4[0], pos4[1], 0)
    glRotatef(heading4, 0, 0, 1)
    glScalef(0.3, 0.3, 0.3)
    drawSquare()
    glPopMatrix()
    glPopMatrix()


def drawBackground():
    random.seed(1)
    glColor3f(1,1,1)
    glBegin(GL_POINTS)
    for i in range(0,200):
        glVertex2f(random.uniform(-1,1), random.uniform(-1,1))
    glEnd()

def drawTriangle():
    glBegin(GL_TRIANGLES)
    glVertex2f(-0.05, 0.0)
    glVertex2f(0.05, 0.0)
    glVertex2f(0.0, 0.15)
    glEnd()

def drawSquare():
    glBegin(GL_QUADS)
    glVertex2f(-0.05, -0.05)
    glVertex2f(0.05, -0.05)
    glVertex2f(0.05, 0.05)
    glVertex2f(-0.05, 0.05)
    glEnd()


starttime = time.time()

def update(dt):
    global pos1, pos2, pos3, pos4, heading1, heading2, heading3, heading4
    t = time.time() - starttime
    pos1 = [math.sin(t), math.cos(t)]
    heading1 = -math.degrees(t) - 90
    pos2 = [-math.sin(t*1.5)*0.75, math.cos(t*1.5)*0.5]
    heading2 = math.degrees(t*1.5) + 90
    pos3 = [math.sin(t*5)*0.2, math.cos(t*5)*0.2]
    pos4 = [-math.sin(t*5+1)*0.2, math.cos(t*5+1)*0.2]
    heading3 = math.degrees(t*7)
    heading4 = math.degrees(t*8)

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