tilearea.cpp

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00001 /* $Id: tilearea.cpp 19041 2010-02-06 13:19:46Z alberth $ */
00002 
00003 /*
00004  * This file is part of OpenTTD.
00005  * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
00006  * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
00007  * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
00008  */
00009 
00012 #include "stdafx.h"
00013 
00014 #include "tile_map.h"
00015 #include "core/math_func.hpp"
00016 #include "tilearea_type.h"
00017 
00023 TileArea::TileArea(TileIndex start, TileIndex end)
00024 {
00025   uint sx = TileX(start);
00026   uint sy = TileY(start);
00027   uint ex = TileX(end);
00028   uint ey = TileY(end);
00029 
00030   if (sx > ex) Swap(sx, ex);
00031   if (sy > ey) Swap(sy, ey);
00032 
00033   this->tile = TileXY(sx, sy);
00034   this->w    = ex - sx + 1;
00035   this->h    = ey - sy + 1;
00036 }
00037 
00042 void TileArea::Add(TileIndex to_add)
00043 {
00044   if (this->tile == INVALID_TILE) {
00045     this->tile = to_add;
00046     this->w = 1;
00047     this->h = 1;
00048     return;
00049   }
00050 
00051   uint sx = TileX(this->tile);
00052   uint sy = TileY(this->tile);
00053   uint ex = sx + this->w - 1;
00054   uint ey = sy + this->h - 1;
00055 
00056   uint ax = TileX(to_add);
00057   uint ay = TileY(to_add);
00058 
00059   sx = min(ax, sx);
00060   sy = min(ay, sy);
00061   ex = max(ax, ex);
00062   ey = max(ay, ey);
00063 
00064   this->tile = TileXY(sx, sy);
00065   this->w    = ex - sx + 1;
00066   this->h    = ey - sy + 1;
00067 }
00068 
00074 bool TileArea::Intersects(const TileArea &ta) const
00075 {
00076   if (ta.w == 0 || this->w == 0) return false;
00077 
00078   assert(ta.w != 0 && ta.h != 0 && this->w != 0 && this->h != 0);
00079 
00080   uint left1   = TileX(this->tile);
00081   uint top1    = TileY(this->tile);
00082   uint right1  = left1 + this->w - 1;
00083   uint bottom1 = top1  + this->h - 1;
00084 
00085   uint left2   = TileX(ta.tile);
00086   uint top2    = TileY(ta.tile);
00087   uint right2  = left2 + ta.w - 1;
00088   uint bottom2 = top2  + ta.h - 1;
00089 
00090   return !(
00091       left2   > right1  ||
00092       right2  < left1   ||
00093       top2    > bottom1 ||
00094       bottom2 < top1
00095     );
00096 }
00097 
00101 void TileArea::ClampToMap()
00102 {
00103   assert(this->tile < MapSize());
00104   this->w = min(this->w, MapSizeX() - TileX(this->tile));
00105   this->h = min(this->h, MapSizeY() - TileY(this->tile));
00106 }
00107 

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