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(svn r16138) -Codechange: move GetClosestWaterDistance to map*

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This commit is contained in:
rubidium 2009-04-24 22:27:21 +00:00
parent f2f476a570
commit 00ed8c6f27
3 changed files with 62 additions and 56 deletions
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57
src/map.cpp
View File

@ -8,6 +8,7 @@
#include "core/alloc_func.hpp"
#include "core/math_func.hpp"
#include "map_func.h"
#include "tile_map.h"
#if defined(_MSC_VER)
/* Why the hell is that not in all MSVC headers?? */
@ -327,3 +328,59 @@ bool CircularTileSearch(TileIndex *tile, uint radius, uint w, uint h, TestTileOn
*tile = INVALID_TILE;
return false;
}
/*!
* Finds the distance for the closest tile with water/land given a tile
* @param tile the tile to find the distance too
* @param water whether to find water or land
* @return distance to nearest water (max 0x7F) / land (max 0x1FF; 0x200 if there is no land)
* @note FAILS when an industry should be seen as water
*/
uint GetClosestWaterDistance(TileIndex tile, bool water)
{
if (IsTileType(tile, MP_WATER) == water) return 0;
uint max_dist = water ? 0x7F : 0x200;
int x = TileX(tile);
int y = TileY(tile);
uint max_x = MapMaxX();
uint max_y = MapMaxY();
uint min_xy = _settings_game.construction.freeform_edges ? 1 : 0;
/* go in a 'spiral' with increasing manhattan distance in each iteration */
for (uint dist = 1; dist < max_dist; dist++) {
/* next 'diameter' */
y--;
/* going counter-clockwise around this square */
for (DiagDirection dir = DIAGDIR_BEGIN; dir < DIAGDIR_END; dir++) {
static const int8 ddx[DIAGDIR_END] = { -1, 1, 1, -1};
static const int8 ddy[DIAGDIR_END] = { 1, 1, -1, -1};
int dx = ddx[dir];
int dy = ddy[dir];
/* each side of this square has length 'dist' */
for (uint a = 0; a < dist; a++) {
/* MP_VOID tiles are not checked (interval is [min; max) for IsInsideMM())*/
if (IsInsideMM(x, min_xy, max_x) && IsInsideMM(y, min_xy, max_y)) {
TileIndex t = TileXY(x, y);
if (IsTileType(t, MP_WATER) == water) return dist;
}
x += dx;
y += dy;
}
}
}
if (!water) {
/* no land found - is this a water-only map? */
for (TileIndex t = 0; t < MapSize(); t++) {
if (!IsTileType(t, MP_VOID) && !IsTileType(t, MP_WATER)) return 0x1FF;
}
}
return max_dist;
}

5
src/map_func.h
View File

@ -431,4 +431,9 @@ static inline TileIndex RandomTileSeed(uint32 r)
*/
#define RandomTile() RandomTileSeed(Random())
/**
* Finds the distance for the closest tile with water/land given a tile
*/
uint GetClosestWaterDistance(TileIndex tile, bool water);
#endif /* MAP_FUNC_H */

56
src/newgrf_industries.cpp
View File

@ -38,62 +38,6 @@ IndustryType MapNewGRFIndustryType(IndustryType grf_type, uint32 grf_id)
return _industry_mngr.GetID(GB(grf_type, 0, 6), grf_id);
}
/**
* Finds the distance for the closest tile with water/land given a tile
* @param tile the tile to find the distance too
* @param water whether to find water or land
* @return distance to nearest water (max 0x7F) / land (max 0x1FF; 0x200 if there is no land)
* @note FAILS when an industry should be seen as water
*/
static uint GetClosestWaterDistance(TileIndex tile, bool water)
{
if (IsTileType(tile, MP_WATER) == water) return 0;
uint max_dist = water ? 0x7F : 0x200;
int x = TileX(tile);
int y = TileY(tile);
uint max_x = MapMaxX();
uint max_y = MapMaxY();
uint min_xy = _settings_game.construction.freeform_edges ? 1 : 0;
/* go in a 'spiral' with increasing manhattan distance in each iteration */
for (uint dist = 1; dist < max_dist; dist++) {
/* next 'diameter' */
y--;
/* going counter-clockwise around this square */
for (DiagDirection dir = DIAGDIR_BEGIN; dir < DIAGDIR_END; dir++) {
static const int8 ddx[DIAGDIR_END] = { -1, 1, 1, -1};
static const int8 ddy[DIAGDIR_END] = { 1, 1, -1, -1};
int dx = ddx[dir];
int dy = ddy[dir];
/* each side of this square has length 'dist' */
for (uint a = 0; a < dist; a++) {
/* MP_VOID tiles are not checked (interval is [min; max) for IsInsideMM())*/
if (IsInsideMM(x, min_xy, max_x) && IsInsideMM(y, min_xy, max_y)) {
TileIndex t = TileXY(x, y);
if (IsTileType(t, MP_WATER) == water) return dist;
}
x += dx;
y += dy;
}
}
}
if (!water) {
/* no land found - is this a water-only map? */
for (TileIndex t = 0; t < MapSize(); t++) {
if (!IsTileType(t, MP_VOID) && !IsTileType(t, MP_WATER)) return 0x1FF;
}
}
return max_dist;
}
/** Make an analysis of a tile and check for its belonging to the same
* industry, and/or the same grf file
* @param tile TileIndex of the tile to query