import time, math
from pyglet.gl import *

window = pyglet.window.Window()

class AlphaSquare:
    def __init__(self, moveradius, color1, color2):
        self.moveradius = moveradius
        self.xpos = 0
        self.ypos = 0
        colors = color1 + color1 + color2 + color2
        self.vlist = pyglet.graphics.vertex_list(4, ('v2f', [-128,-128, 128,-128, -128,128, 128,128]), ('c4f', colors))
    def draw(self):
        glEnable(GL_BLEND)
        glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA)
        glPushMatrix()
        glTranslatef(self.xpos, self.ypos, 0)
        self.vlist.draw(GL_TRIANGLE_STRIP)
        glPopMatrix()
        glDisable(GL_BLEND)
    def update(self,dt):
        self.xpos = self.moveradius * math.sin(time.time())
        self.ypos = self.moveradius * math.cos(time.time())


objects = []
objects.append( AlphaSquare(0, [1, 1, 1, 1], [1, 1, 1, 1]) )
objects.append( AlphaSquare(128, [1,0,0, 0.9], [0, 1, 0, 0.0]) )


@window.event
def on_draw():
    glClearColor(0, 0.3, 0.5, 0)
    glClear(GL_COLOR_BUFFER_BIT)
    
    glLoadIdentity()
    glTranslatef(320,240,0)

    for o in objects:
        o.draw()


def update(dt):
    global objects
    for o in objects:
        o.update(dt)

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