Function show_map

crawl-ref/source/viewmap.cc:907–961

show_map() now centers the known map along x or y. This prevents the player from getting "artificial" location clues by using the map to see how close to the end they are. They'll need to explore to get that. This function is still a mess, though. -- bwr

// map to see how close to the end they are. They'll need to explore
// to get that. This function is still a mess, though. -- bwr
bool show_map(level_pos &lpos, bool travel_mode, bool allow_offlevel)
{
    if (map_view)
    {
        ASSERT(map_view->is_alive());
        // handle reentry -- just attempt to set the position. Ignore both
        // the travel_mode and the allow_offlevel params -- inherit from the
        // running map.
        map_view->set_lpos(lpos);
        return false;
    }
    else
    {
#ifdef USE_TILE_LOCAL
        mouse_control mc(MOUSE_MODE_NORMAL);
        tiles.do_map_display();
#endif

#ifdef USE_TILE
        ui::cutoff_point ui_cutoff_point;
#endif
#ifdef USE_TILE_WEB
        tiles_ui_control ui(UI_VIEW_MAP);
#endif

        if (!lpos.id.is_valid() || !allow_offlevel)
            lpos.id = level_id::current();

        levelview_excursion le(travel_mode);
        map_view = make_shared<UIMapView>(lpos, le, travel_mode, allow_offlevel);

#ifdef USE_TILE_LOCAL
        unwind_bool inhibit_rendering(ui::should_render_current_regions, false);
#else
        cursor_control cc(!Options.use_fake_cursor);
#endif

        ui::push_layout(map_view, KMC_LEVELMAP);
        while (map_view->is_alive() && !crawl_state.seen_hups)
            ui::pump_events();
        ui::pop_layout();

#ifdef USE_TILE_LOCAL
        tiles.set_map_display(false);
#endif
#ifdef USE_TILE
        tiles.place_cursor(CURSOR_MAP, NO_CURSOR);
#endif

        lpos = map_view->lpos();
        const bool result = map_view->chose();
        map_view = nullptr;
        return result;
    }
}

level_pos map_follow_stairs(bool up, const coord_def &pos)
{