* Update the viewport position being displayed. * @param w %Window owning the viewport. * @param delta_ms Milliseconds since the last update. */
| 1986 | * @param delta_ms Milliseconds since the last update. |
| 1987 | */ |
| 1988 | void UpdateViewportPosition(Window *w, uint32_t delta_ms) |
| 1989 | { |
| 1990 | ViewportData &vp = *w->viewport; |
| 1991 | |
| 1992 | if (vp.follow_vehicle != VehicleID::Invalid()) { |
| 1993 | const Vehicle *veh = Vehicle::Get(vp.follow_vehicle); |
| 1994 | Point pt = MapXYZToViewport(vp, veh->x_pos, veh->y_pos, veh->z_pos); |
| 1995 | |
| 1996 | vp.scrollpos_x = pt.x; |
| 1997 | vp.scrollpos_y = pt.y; |
| 1998 | SetViewportPosition(w, pt.x, pt.y); |
| 1999 | } else { |
| 2000 | /* Ensure the destination location is within the map */ |
| 2001 | ClampViewportToMap(vp, &vp.dest_scrollpos_x, &vp.dest_scrollpos_y); |
| 2002 | |
| 2003 | int delta_x = vp.dest_scrollpos_x - vp.scrollpos_x; |
| 2004 | int delta_y = vp.dest_scrollpos_y - vp.scrollpos_y; |
| 2005 | |
| 2006 | int current_x = vp.scrollpos_x; |
| 2007 | int current_y = vp.scrollpos_y; |
| 2008 | |
| 2009 | bool update_overlay = false; |
| 2010 | if (delta_x != 0 || delta_y != 0) { |
| 2011 | if (_settings_client.gui.smooth_scroll) { |
| 2012 | int delta_x_clamped; |
| 2013 | int delta_y_clamped; |
| 2014 | |
| 2015 | if (abs(delta_x) > abs(delta_y)) { |
| 2016 | ClampSmoothScroll(delta_ms, delta_x, delta_y, delta_x_clamped, delta_y_clamped); |
| 2017 | } else { |
| 2018 | ClampSmoothScroll(delta_ms, delta_y, delta_x, delta_y_clamped, delta_x_clamped); |
| 2019 | } |
| 2020 | |
| 2021 | vp.scrollpos_x += delta_x_clamped; |
| 2022 | vp.scrollpos_y += delta_y_clamped; |
| 2023 | } else { |
| 2024 | vp.scrollpos_x = vp.dest_scrollpos_x; |
| 2025 | vp.scrollpos_y = vp.dest_scrollpos_y; |
| 2026 | } |
| 2027 | update_overlay = (vp.scrollpos_x == vp.dest_scrollpos_x && |
| 2028 | vp.scrollpos_y == vp.dest_scrollpos_y); |
| 2029 | } |
| 2030 | |
| 2031 | ClampViewportToMap(vp, &vp.scrollpos_x, &vp.scrollpos_y); |
| 2032 | |
| 2033 | /* When moving small amounts around the border we can get stuck, and |
| 2034 | * not actually move. In those cases, teleport to the destination. */ |
| 2035 | if ((delta_x != 0 || delta_y != 0) && current_x == vp.scrollpos_x && current_y == vp.scrollpos_y) { |
| 2036 | vp.scrollpos_x = vp.dest_scrollpos_x; |
| 2037 | vp.scrollpos_y = vp.dest_scrollpos_y; |
| 2038 | } |
| 2039 | |
| 2040 | SetViewportPosition(w, vp.scrollpos_x, vp.scrollpos_y); |
| 2041 | if (update_overlay) RebuildViewportOverlay(w); |
| 2042 | } |
| 2043 | } |
| 2044 | |
| 2045 | /** |
no test coverage detected