landscape.h

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00001 /* $Id$ */
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 #ifndef LANDSCAPE_H
00013 #define LANDSCAPE_H
00014 
00015 #include "core/geometry_type.hpp"
00016 #include "tile_cmd.h"
00017 
00018 static const uint SNOW_LINE_MONTHS = 12; 
00019 static const uint SNOW_LINE_DAYS   = 32; 
00020 
00025 struct SnowLine {
00026   byte table[SNOW_LINE_MONTHS][SNOW_LINE_DAYS]; 
00027   byte highest_value; 
00028   byte lowest_value;  
00029 };
00030 
00031 bool IsSnowLineSet();
00032 void SetSnowLine(byte table[SNOW_LINE_MONTHS][SNOW_LINE_DAYS]);
00033 byte GetSnowLine();
00034 byte HighestSnowLine();
00035 byte LowestSnowLine();
00036 void ClearSnowLine();
00037 
00038 uint GetPartialZ(int x, int y, Slope corners);
00039 uint GetSlopeZ(int x, int y);
00040 void GetSlopeZOnEdge(Slope tileh, DiagDirection edge, int *z1, int *z2);
00041 int GetSlopeZInCorner(Slope tileh, Corner corner);
00042 Slope GetFoundationSlope(TileIndex tile, uint *z);
00043 
00052 static inline Point RemapCoords(int x, int y, int z)
00053 {
00054   Point pt;
00055   pt.x = (y - x) * 2;
00056   pt.y = y + x - z;
00057   return pt;
00058 }
00059 
00068 static inline Point RemapCoords2(int x, int y)
00069 {
00070   return RemapCoords(x, y, GetSlopeZ(x, y));
00071 }
00072 
00081 static inline Point InverseRemapCoords(int x, int y)
00082 {
00083   Point pt = {(y * 2 - x) >> 2, (y * 2 + x) >> 2};
00084   return pt;
00085 }
00086 
00087 uint ApplyFoundationToSlope(Foundation f, Slope *s);
00088 void DrawFoundation(TileInfo *ti, Foundation f);
00089 bool HasFoundationNW(TileIndex tile, Slope slope_here, uint z_here);
00090 bool HasFoundationNE(TileIndex tile, Slope slope_here, uint z_here);
00091 
00092 void DoClearSquare(TileIndex tile);
00093 void RunTileLoop();
00094 
00095 void InitializeLandscape();
00096 void GenerateLandscape(byte mode);
00097 
00098 #endif /* LANDSCAPE_H */

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