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/* $Id$ */
#include "stdafx.h"
#include "openttd.h"
#include "tile.h"
#include "tunnel_map.h"
#include "vehicle.h"
TileIndex GetOtherTunnelEnd(TileIndex tile)
{
DiagDirection dir = GetTunnelDirection(tile);
TileIndexDiff delta = TileOffsByDir(dir);
uint z = GetTileZ(tile);
dir = ReverseDiagDir(dir);
do {
tile += delta;
} while (
!IsTunnelTile(tile) ||
GetTunnelDirection(tile) != dir ||
GetTileZ(tile) != z
);
return tile;
}
/** Retrieve the exit-tile of the vehicle from inside a tunnel
* Very similar to GetOtherTunnelEnd(), but we use the vehicle's
* direction for determining which end of the tunnel to find
* @param v the vehicle which is inside the tunnel and needs an exit
* @return the exit-tile of the tunnel based on the vehicle's direction */
TileIndex GetVehicleOutOfTunnelTile(const Vehicle *v)
{
TileIndex tile = TileVirtXY(v->x_pos, v->y_pos);
DiagDirection dir = DirToDiagDir(v->direction);
TileIndexDiff delta = TileOffsByDir(dir);
uint z = v->z_pos;
dir = ReverseDiagDir(dir);
while (
!IsTunnelTile(tile) ||
GetTunnelDirection(tile) != dir ||
GetTileZ(tile) != z
) {
tile += delta;
}
return tile;
}
static bool IsTunnelInWayDir(TileIndex tile, uint z, DiagDirection dir)
{
TileIndexDiff delta = TileOffsByDir(dir);
uint height;
do {
tile -= delta;
height = GetTileZ(tile);
} while (z < height);
return
z == height &&
IsTunnelTile(tile) &&
GetTunnelDirection(tile) == dir;
}
bool IsTunnelInWay(TileIndex tile, uint z)
{
return
IsTunnelInWayDir(tile, z, DIAGDIR_NE) ||
IsTunnelInWayDir(tile, z, DIAGDIR_SE) ||
IsTunnelInWayDir(tile, z, DIAGDIR_SW) ||
IsTunnelInWayDir(tile, z, DIAGDIR_NW);
}
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