import time, math
from pyglet.gl import *

window = pyglet.window.Window()


class AlphaSquare:
    def __init__(self, moveradius=0.0, color=[1,1,1,1]):
        self.moveradius = moveradius
        self.xpos = 0
        self.ypos = 0
        self.color = color
    def draw(self):
        glEnable(GL_BLEND)
        glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA)
        glColor4f(self.color[0],self.color[1],self.color[2],self.color[3])
        glPushMatrix()
        glTranslatef(self.xpos, self.ypos, 0)
        glBegin(GL_TRIANGLE_STRIP)
        glVertex2f(-2,-2)
        glVertex2f(2,-2)
        glVertex2f(-2,2)
        glVertex2f(2,2)
        glEnd()
        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(color=[1, 1, 1, 1]) )
objects.append( AlphaSquare(moveradius=2, color=[1,0,0, 0.5]) )


@window.event
def on_draw():
    glClearColor(0, 0.3, 0.5, 0)
    glClear(GL_COLOR_BUFFER_BIT)
    
    glMatrixMode(GL_PROJECTION)
    glLoadIdentity()
    gluOrtho2D(-5, 5, -5, 5)
    glMatrixMode(GL_MODELVIEW)

    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()