Function init_positions

examples/space_invaders/space_invaders.py:425–457

Establish a new field of play. This generates GlyphCoordinate objects and persists them to the database.

(session)

def init_positions(session):
    """Establish a new field of play.

    This generates GlyphCoordinate objects
    and persists them to the database.

    """

    # delete all existing coordinates
    session.query(GlyphCoordinate).delete()

    session.add(
        GlyphCoordinate(
            session, "ship", WINDOW_WIDTH // 2 - 2, WINDOW_HEIGHT - 4
        )
    )

    arrangement = (
        ("enemy3", 50),
        ("enemy2", 25),
        ("enemy1", 10),
        ("enemy2", 25),
        ("enemy1", 10),
    )
    for ship_vert, (etype, score) in zip(
        range(5, 30, ENEMY_VERT_SPACING), arrangement
    ):
        for ship_horiz in range(0, 50, 10):
            session.add(
                GlyphCoordinate(
                    session, etype, ship_horiz, ship_vert, score=score
                )
            )


def draw(session, window, state):