#!/usr/bin/env python
"""Demonstrates a useful pattern for pyglet applications: subclassing Window.
"""

import pyglet


class HelloWorldWindow(pyglet.window.Window):
    def __init__(self):
        super().__init__()
        self.label = pyglet.text.Label('Hello, world!', font_size=36,
                                       x=self.width//2, y=self.height//2,
                                       anchor_x='center')

    def on_draw(self):
        self.clear()
        self.label.draw()


if __name__ == '__main__':
    window = HelloWorldWindow()
    pyglet.app.run()