Function move_missile

examples/space_invaders/space_invaders.py:635–661

Update the status of the current missile, if any.

(session, window, state)

def move_missile(session, window, state):
    """Update the status of the current missile, if any."""

    if state["missile"] is None or state["tick"] % 2 != 0:
        return

    missile = state["missile"]

    # locate enemy glyphs which intersect with the
    # missile's current position; i.e. a hit
    glyph = (
        session.query(GlyphCoordinate)
        .join(GlyphCoordinate.glyph.of_type(EnemyGlyph))
        .filter(GlyphCoordinate.intersects(missile))
        .first()
    )
    missile.blank(window)
    if glyph or missile.top_bound:
        # missile is done
        session.delete(missile)
        state["missile"] = None
        if glyph:
            # score!
            score(session, window, state, glyph)
    else:
        # move missile up one character.
        missile.y -= 1


def move_saucer(session, window, state):