docs: def draw_build_target(self, surf):
      """Draw the build target."""
      round_half = lambda v, cond: round(v - 0.5) + 0.5 if cond else round(v)
  
      queued_action = self._queued_action
      if queued_action:
        radius = queued_action.footprint_radius
        if radius:
          pos = self.get_mouse_pos()
          if pos:
            pos = point.Point(round_half(pos.world_pos.x, (radius * 2) % 2),
                              round_half(pos.world_pos.y, (radius * 2) % 2))
            surf.draw_circle(
                colors.PLAYER_ABSOLUTE_PALETTE[
                    self._obs.observation.player_common.player_id],
                pos, radius)