landscape.h

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00001 /* $Id: landscape.h 23316 2011-11-24 12:38:48Z peter1138 $ */
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 #include "zoom_type.h"
00018 
00019 static const uint SNOW_LINE_MONTHS = 12; 
00020 static const uint SNOW_LINE_DAYS   = 32; 
00021 
00026 struct SnowLine {
00027   byte table[SNOW_LINE_MONTHS][SNOW_LINE_DAYS]; 
00028   byte highest_value; 
00029   byte lowest_value;  
00030 };
00031 
00032 bool IsSnowLineSet();
00033 void SetSnowLine(byte table[SNOW_LINE_MONTHS][SNOW_LINE_DAYS]);
00034 byte GetSnowLine();
00035 byte HighestSnowLine();
00036 byte LowestSnowLine();
00037 void ClearSnowLine();
00038 
00039 int GetSlopeZInCorner(Slope tileh, Corner corner);
00040 Slope GetFoundationSlope(TileIndex tile, int *z = NULL);
00041 
00042 uint GetPartialPixelZ(int x, int y, Slope corners);
00043 int GetSlopePixelZ(int x, int y);
00044 void GetSlopePixelZOnEdge(Slope tileh, DiagDirection edge, int *z1, int *z2);
00045 
00055 static inline int GetSlopePixelZInCorner(Slope tileh, Corner corner)
00056 {
00057   return GetSlopeZInCorner(tileh, corner) * TILE_HEIGHT;
00058 }
00059 
00068 static inline Slope GetFoundationPixelSlope(TileIndex tile, int *z)
00069 {
00070   assert(z != NULL);
00071   Slope s = GetFoundationSlope(tile, z);
00072   *z *= TILE_HEIGHT;
00073   return s;
00074 }
00075 
00084 static inline Point RemapCoords(int x, int y, int z)
00085 {
00086   Point pt;
00087   pt.x = (y - x) * 2 * ZOOM_LVL_BASE;
00088   pt.y = (y + x - z) * ZOOM_LVL_BASE;
00089   return pt;
00090 }
00091 
00100 static inline Point RemapCoords2(int x, int y)
00101 {
00102   return RemapCoords(x, y, GetSlopePixelZ(x, y));
00103 }
00104 
00113 static inline Point InverseRemapCoords(int x, int y)
00114 {
00115   Point pt = {(y * 2 - x) >> (2 + ZOOM_LVL_SHIFT), (y * 2 + x) >> (2 + ZOOM_LVL_SHIFT)};
00116   return pt;
00117 }
00118 
00119 uint ApplyFoundationToSlope(Foundation f, Slope *s);
00128 static inline uint ApplyPixelFoundationToSlope(Foundation f, Slope *s)
00129 {
00130   return ApplyFoundationToSlope(f, s) * TILE_HEIGHT;
00131 }
00132 
00133 void DrawFoundation(TileInfo *ti, Foundation f);
00134 bool HasFoundationNW(TileIndex tile, Slope slope_here, uint z_here);
00135 bool HasFoundationNE(TileIndex tile, Slope slope_here, uint z_here);
00136 
00137 void DoClearSquare(TileIndex tile);
00138 void RunTileLoop();
00139 
00140 void InitializeLandscape();
00141 void GenerateLandscape(byte mode);
00142 
00143 #endif /* LANDSCAPE_H */