author | rubidium |
Sun, 23 Sep 2007 07:37:38 +0000 | |
branch | noai |
changeset 9703 | d2a6acdbd665 |
parent 9694 | e72987579514 |
child 9704 | 197cb8c6ae17 |
permissions | -rw-r--r-- |
2186 | 1 |
/* $Id$ */ |
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/** @file map.h */ |
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#ifndef MAP_H |
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#define MAP_H |
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#include "stdafx.h" |
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#include "direction.h" |
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extern uint _map_tile_mask; |
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/** |
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* 'Wraps' the given tile to it is within the map. It does |
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* this by masking the 'high' bits of. |
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* @param x the tile to 'wrap' |
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*/ |
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#define TILE_MASK(x) ((x) & _map_tile_mask) |
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/** |
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* Asserts when the tile is outside of the map. |
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* @param x the tile to check |
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*/ |
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#define TILE_ASSERT(x) assert(TILE_MASK(x) == (x)); |
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/** |
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* Data that is stored per tile. Also used TileExtended for this. |
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* Look at docs/landscape.html for the exact meaning of the members. |
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*/ |
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struct Tile { |
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byte type_height; ///< The type (bits 4..7) and height of the northern corner |
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byte m1; ///< Primarily used for ownership information |
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uint16 m2; ///< Primarily used for indices to towns, industries and stations |
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byte m3; ///< General purpose |
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byte m4; ///< General purpose |
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byte m5; ///< General purpose |
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byte m6; ///< Primarily used for bridges and rainforest/desert |
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}; |
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/** |
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* Data that is stored per tile. Also used Tile for this. |
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* Look at docs/landscape.html for the exact meaning of the members. |
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*/ |
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struct TileExtended { |
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byte m7; ///< Primarily used for newgrf support |
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}; |
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/** |
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* Pointer to the tile-array. |
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* |
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* This variable points to the tile-array which contains the tiles of |
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* the map. |
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*/ |
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extern Tile *_m; |
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/** |
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* Pointer to the extended tile-array. |
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* |
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* This variable points to the extended tile-array which contains the tiles |
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* of the map. |
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*/ |
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extern TileExtended *_me; |
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/** |
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* Allocate a new map with the given size. |
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*/ |
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void AllocateMap(uint size_x, uint size_y); |
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/** |
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* Logarithm of the map size along the X side. |
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* @note try to avoid using this one |
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* @return 2^"return value" == MapSizeX() |
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*/ |
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static inline uint MapLogX() |
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{ |
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extern uint _map_log_x; |
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return _map_log_x; |
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} |
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/** |
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* Get the size of the map along the X |
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* @return the number of tiles along the X of the map |
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*/ |
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static inline uint MapSizeX() |
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{ |
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extern uint _map_size_x; |
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return _map_size_x; |
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} |
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/** |
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* Get the size of the map along the Y |
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* @return the number of tiles along the Y of the map |
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*/ |
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static inline uint MapSizeY() |
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{ |
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extern uint _map_size_y; |
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return _map_size_y; |
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} |
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/** |
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* Get the size of the map |
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* @return the number of tiles of the map |
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*/ |
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static inline uint MapSize() |
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{ |
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extern uint _map_size; |
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return _map_size; |
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} |
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/** |
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* Gets the maximum X coordinate within the map, including MP_VOID |
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* @return the maximum X coordinate |
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113 |
*/ |
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static inline uint MapMaxX() |
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115 |
{ |
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return MapSizeX() - 1; |
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} |
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118 |
|
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119 |
/** |
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* Gets the maximum X coordinate within the map, including MP_VOID |
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* @return the maximum X coordinate |
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*/ |
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static inline uint MapMaxY() |
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{ |
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return MapSizeY() - 1; |
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} |
689 | 127 |
|
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128 |
/** |
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* Scales relative to the number of tiles. |
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130 |
*/ |
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131 |
uint ScaleByMapSize(uint); |
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132 |
|
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/** |
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* Scale relative to the circumference of the map. |
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135 |
*/ |
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uint ScaleByMapSize1D(uint); |
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137 |
|
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138 |
/** |
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* The index/ID of a Tile. |
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140 |
*/ |
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typedef uint32 TileIndex; |
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142 |
|
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143 |
/** |
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* An offset value between to tiles. |
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145 |
* |
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* This value is used fro the difference between |
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* to tiles. It can be added to a tileindex to get |
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* the resulting tileindex of the start tile applied |
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* with this saved difference. |
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150 |
* |
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* @see TileDiffXY(int, int) |
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*/ |
1981 | 153 |
typedef int32 TileIndexDiff; |
154 |
||
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155 |
/** |
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* Returns the TileIndex of a coordinate. |
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* |
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158 |
* @param x The x coordinate of the tile |
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* @param y The y coordinate of the tile |
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* @return The TileIndex calculated by the coordinate |
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161 |
*/ |
1981 | 162 |
static inline TileIndex TileXY(uint x, uint y) |
163 |
{ |
|
2051 | 164 |
return (y * MapSizeX()) + x; |
1981 | 165 |
} |
166 |
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167 |
/** |
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* Calculates an offset for the given coordinate(-offset). |
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169 |
* |
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* This function calculate an offset value which can be added to an |
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171 |
* #TileIndex. The coordinates can be negative. |
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172 |
* |
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* @param x The offset in x direction |
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* @param y The offset in y direction |
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* @return The resulting offset value of the given coordinate |
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176 |
* @see ToTileIndexDiff(TileIndexDiffC) |
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*/ |
1981 | 178 |
static inline TileIndexDiff TileDiffXY(int x, int y) |
179 |
{ |
|
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180 |
/* Multiplication gives much better optimization on MSVC than shifting. |
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181 |
* 0 << shift isn't optimized to 0 properly. |
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182 |
* Typically x and y are constants, and then this doesn't result |
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183 |
* in any actual multiplication in the assembly code.. */ |
2051 | 184 |
return (y * MapSizeX()) + x; |
1981 | 185 |
} |
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186 |
|
1980
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187 |
static inline TileIndex TileVirtXY(uint x, uint y) |
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188 |
{ |
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|
189 |
return (y >> 4 << MapLogX()) + (x >> 4); |
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190 |
} |
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191 |
|
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192 |
|
1247 | 193 |
enum { |
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194 |
INVALID_TILE = (TileIndex)-1 ///< The very nice invalid tile marker |
1247 | 195 |
}; |
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196 |
|
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197 |
enum { |
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198 |
TILE_SIZE = 16, ///< Tiles are 16x16 "units" in size |
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199 |
TILE_PIXELS = 32, ///< a tile is 32x32 pixels |
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200 |
TILE_HEIGHT = 8, ///< The standard height-difference between tiles on two levels is 8 (z-diff 8) |
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201 |
}; |
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202 |
|
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203 |
|
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204 |
/** |
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205 |
* Get the X component of a tile |
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206 |
* @param tile the tile to get the X component of |
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207 |
* @return the X component |
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208 |
*/ |
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209 |
static inline uint TileX(TileIndex tile) |
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210 |
{ |
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211 |
return tile & MapMaxX(); |
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212 |
} |
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213 |
|
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214 |
/** |
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215 |
* Get the Y component of a tile |
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216 |
* @param tile the tile to get the Y component of |
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217 |
* @return the Y component |
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218 |
*/ |
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219 |
static inline uint TileY(TileIndex tile) |
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220 |
{ |
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221 |
return tile >> MapLogX(); |
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222 |
} |
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223 |
|
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224 |
/** |
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225 |
* A pair-construct of a TileIndexDiff. |
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226 |
* |
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227 |
* This can be used to save the difference between to |
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* tiles as a pair of x and y value. |
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*/ |
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struct TileIndexDiffC { |
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int16 x; ///< The x value of the coordinate |
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int16 y; ///< The y value of the coordinate |
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}; |
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|
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/** |
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* Return the offset between to tiles from a TileIndexDiffC struct. |
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* |
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* This function works like #TileDiffXY(int, int) and returns the |
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* difference between two tiles. |
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* |
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* @param tidc The coordinate of the offset as TileIndexDiffC |
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* @return The difference between two tiles. |
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* @see TileDiffXY(int, int) |
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*/ |
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static inline TileIndexDiff ToTileIndexDiff(TileIndexDiffC tidc) |
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{ |
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return (tidc.y << MapLogX()) + tidc.x; |
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} |
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|
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#ifndef _DEBUG |
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/** |
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* Adds to tiles together. |
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* |
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* @param x One tile |
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* @param y An other tile to add |
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* @return The resulting tile(index) |
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*/ |
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#define TILE_ADD(x,y) ((x) + (y)) |
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#else |
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extern TileIndex TileAdd(TileIndex tile, TileIndexDiff add, |
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const char *exp, const char *file, int line); |
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#define TILE_ADD(x, y) (TileAdd((x), (y), #x " + " #y, __FILE__, __LINE__)) |
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#endif |
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|
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/** |
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* Adds a given offset to a tile. |
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* |
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* @param tile The tile to add an offset on it |
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* @param x The x offset to add to the tile |
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* @param y The y offset to add to the tile |
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*/ |
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#define TILE_ADDXY(tile, x, y) TILE_ADD(tile, TileDiffXY(x, y)) |
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|
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/** |
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* Adds an offset to a tile and check if we are still on the map. |
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*/ |
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uint TileAddWrap(TileIndex tile, int addx, int addy); |
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||
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/** |
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* Returns the TileIndexDiffC offset from a DiagDirection. |
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* |
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* @param dir The given direction |
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* @return The offset as TileIndexDiffC value |
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*/ |
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static inline TileIndexDiffC TileIndexDiffCByDiagDir(DiagDirection dir) |
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{ |
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extern const TileIndexDiffC _tileoffs_by_diagdir[DIAGDIR_END]; |
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assert(IsValidDiagDirection(dir)); |
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return _tileoffs_by_diagdir[dir]; |
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} |
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/** |
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* Add a TileIndexDiffC to a TileIndex and returns the new one. |
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* |
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* Returns tile + the diff given in diff. If the result tile would end up |
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* outside of the map, INVALID_TILE is returned instead. |
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* |
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* @param tile The base tile to add the offset on |
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* @param diff The offset to add on the tile |
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* @return The resulting TileIndex |
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*/ |
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static inline TileIndex AddTileIndexDiffCWrap(TileIndex tile, TileIndexDiffC diff) |
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{ |
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int x = TileX(tile) + diff.x; |
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int y = TileY(tile) + diff.y; |
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if (x < 0 || y < 0 || x > (int)MapMaxX() || y > (int)MapMaxY()) |
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return INVALID_TILE; |
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else |
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return TileXY(x, y); |
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} |
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|
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/** |
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* Returns the diff between two tiles |
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* |
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* @param tile_a from tile |
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* @param tile_b to tile |
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* @return the difference between tila_a and tile_b |
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*/ |
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static inline TileIndexDiffC TileIndexToTileIndexDiffC(TileIndex tile_a, TileIndex tile_b) |
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{ |
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TileIndexDiffC difference; |
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|
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difference.x = TileX(tile_a) - TileX(tile_b); |
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difference.y = TileY(tile_a) - TileY(tile_b); |
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|
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return difference; |
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} |
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|
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/* Functions to calculate distances */ |
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uint DistanceManhattan(TileIndex, TileIndex); ///< also known as L1-Norm. Is the shortest distance one could go over diagonal tracks (or roads) |
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uint DistanceSquare(TileIndex, TileIndex); ///< euclidian- or L2-Norm squared |
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uint DistanceMax(TileIndex, TileIndex); ///< also known as L-Infinity-Norm |
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uint DistanceMaxPlusManhattan(TileIndex, TileIndex); ///< Max + Manhattan |
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uint DistanceFromEdge(TileIndex); ///< shortest distance from any edge of the map |
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|
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/** |
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* Starts a loop which iterates to a square of tiles |
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* |
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* This macro starts 2 nested loops which iterates over a square of tiles. |
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* |
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* @param var The name of the variable which contains the current tile |
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* @param w The width (x-width) of the square |
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* @param h The heigth (y-width) of the square |
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* @param tile The start tile of the square |
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*/ |
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#define BEGIN_TILE_LOOP(var, w, h, tile) \ |
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{ \ |
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int h_cur = h; \ |
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uint var = tile; \ |
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do { \ |
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int w_cur = w; \ |
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do { |
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/** |
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* Ends the square-loop used before |
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* |
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* @see BEGIN_TILE_LOOP |
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*/ |
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#define END_TILE_LOOP(var, w, h, tile) \ |
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} while (++var, --w_cur != 0); \ |
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} while (var += TileDiffXY(0, 1) - (w), --h_cur != 0); \ |
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} |
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/** |
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* Convert a DiagDirection to a TileIndexDiff |
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* |
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* @param dir The DiagDirection |
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* @return The resulting TileIndexDiff |
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* @see TileIndexDiffCByDiagDir |
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*/ |
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static inline TileIndexDiff TileOffsByDiagDir(DiagDirection dir) |
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{ |
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extern const TileIndexDiffC _tileoffs_by_diagdir[DIAGDIR_END]; |
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|
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assert(IsValidDiagDirection(dir)); |
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return ToTileIndexDiff(_tileoffs_by_diagdir[dir]); |
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} |
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|
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/** |
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* Convert a Direction to a TileIndexDiff. |
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* |
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* @param dir The direction to convert from |
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* @return The resulting TileIndexDiff |
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*/ |
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static inline TileIndexDiff TileOffsByDir(Direction dir) |
900 | 385 |
{ |
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extern const TileIndexDiffC _tileoffs_by_dir[DIR_END]; |
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assert(IsValidDirection(dir)); |
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return ToTileIndexDiff(_tileoffs_by_dir[dir]); |
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} |
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||
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/** |
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* A callback function type for searching tiles. |
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* |
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* @param tile The tile to test |
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* @param data additional data for the callback function to use |
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* @return A boolean value, depend on the definition of the function. |
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*/ |
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typedef bool TestTileOnSearchProc(TileIndex tile, uint32 data); |
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|
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/** |
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* Searches for some cirumstances of a tile around a given tile with a helper function. |
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*/ |
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bool CircularTileSearch(TileIndex tile, uint size, TestTileOnSearchProc proc, uint32 data); |
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|
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/** Approximation of the length of a straight track, relative to a diagonal |
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* track (ie the size of a tile side). |
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* |
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* #defined instead of const so it can |
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* stay integer. (no runtime float operations) Is this needed? |
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* Watch out! There are _no_ brackets around here, to prevent intermediate |
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* rounding! Be careful when using this! |
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* This value should be sqrt(2)/2 ~ 0.7071 */ |
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#define STRAIGHT_TRACK_LENGTH 7071/10000 |
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|
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#endif /* MAP_H */ |