+ vik_viewport_screen_to_coord ( vp, 0, 0, &tleft );
+ vik_viewport_screen_to_coord ( vp, vik_viewport_get_width(vp), 0, &tright );
+ vik_viewport_screen_to_coord ( vp, 0, vik_viewport_get_height(vp), &bleft );
+ vik_viewport_screen_to_coord ( vp, vp->width, vp->height, &bright );
+
+ vik_coord_convert(&tleft, VIK_COORD_LATLON);
+ vik_coord_convert(&tright, VIK_COORD_LATLON);
+ vik_coord_convert(&bleft, VIK_COORD_LATLON);
+ vik_coord_convert(&bright, VIK_COORD_LATLON);
+
+ *max_lat = MAX(tleft.north_south, tright.north_south);
+ *min_lat = MIN(bleft.north_south, bright.north_south);
+ *max_lon = MAX(tright.east_west, bright.east_west);
+ *min_lon = MIN(tleft.east_west, bleft.east_west);
+}