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(svn r9371) -Feature: Add support for variable snow lines in the arctic climate, supplied

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by newgrf files. When this is enabled forests cannot be built below the highest
snow line, and farms can't be built above it. Houses still use the
_opt.snow_line so they are all consistent, so to make them respect the snowline
you may want to use some newhouses features as well.
This commit is contained in:
maedhros
2007-03-20 13:47:00 +00:00
parent 7812f7fd0a
commit 48f2bf9bb1
13 changed files with 122 additions and 14 deletions
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59
src/landscape.cpp
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@@ -5,6 +5,7 @@
#include "bridge_map.h"
#include "heightmap.h"
#include "clear_map.h"
#include "date.h"
#include "functions.h"
#include "map.h"
#include "player.h"
@@ -14,6 +15,7 @@
#include <stdarg.h>
#include "viewport.h"
#include "command.h"
#include "landscape.h"
#include "vehicle.h"
#include "variables.h"
#include "void_map.h"
@@ -61,6 +63,7 @@ const Slope _inclined_tileh[] = {
SLOPE_NWS, SLOPE_WSE, SLOPE_SEN, SLOPE_ENW
};
SnowLine *_snow_line = NULL;
uint GetPartialZ(int x, int y, Slope corners)
{
@@ -302,6 +305,62 @@ void GetTileDesc(TileIndex tile, TileDesc *td)
_tile_type_procs[GetTileType(tile)]->get_tile_desc_proc(tile, td);
}
/**
* Has a snow line table already been loaded.
* @return true if the table has been loaded already.
*/
bool IsSnowLineSet(void)
{
return _snow_line != NULL;
}
/**
* Set a variable snow line, as loaded from a newgrf file.
* @param table the 12 * 32 byte table containing the snowline for each day
*/
void SetSnowLine(byte table[SNOW_LINE_MONTHS][SNOW_LINE_DAYS])
{
_snow_line = CallocT<SnowLine>(1);
memcpy(_snow_line->table, table, sizeof(_snow_line->table));
for (uint i = 0; i < SNOW_LINE_MONTHS; i++) {
for (uint j = 0; j < SNOW_LINE_DAYS; j++) {
_snow_line->highest_value = max(_snow_line->highest_value, table[i][j]);
}
}
}
/**
* Get the current snow line, either variable or static.
* @return the snow line height.
*/
byte GetSnowLine(void)
{
if (_snow_line == NULL) return _opt.snow_line;
YearMonthDay ymd;
ConvertDateToYMD(_date, &ymd);
return _snow_line->table[ymd.month][ymd.day];
}
/**
* Get the highest possible snow line height, either variable or static.
* @return the highest snow line height.
*/
byte HighestSnowLine(void)
{
return _snow_line == NULL ? _opt.snow_line : _snow_line->highest_value;
}
/**
* Clear the variable snow line table and free the memory.
*/
void ClearSnowLine(void)
{
free(_snow_line);
_snow_line = NULL;
}
/** Clear a piece of landscape
* @param tile tile to clear
* @param flags of operation to conduct