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/* $Id$ */
#include "stdafx.h"
#include "openttd.h"
#include "bridge_map.h"
#include "variables.h"
TileIndex GetBridgeEnd(TileIndex tile, DiagDirection dir)
{
TileIndexDiff delta = TileOffsByDiagDir(dir);
dir = ReverseDiagDir(dir);
do {
tile += delta;
} while (!IsBridgeTile(tile) || GetBridgeRampDirection(tile) != dir);
return tile;
}
TileIndex GetNorthernBridgeEnd(TileIndex t)
{
return GetBridgeEnd(t, ReverseDiagDir(AxisToDiagDir(GetBridgeAxis(t))));
}
TileIndex GetSouthernBridgeEnd(TileIndex t)
{
return GetBridgeEnd(t, AxisToDiagDir(GetBridgeAxis(t)));
}
TileIndex GetOtherBridgeEnd(TileIndex tile)
{
assert(IsBridgeTile(tile));
return GetBridgeEnd(tile, GetBridgeRampDirection(tile));
}
uint GetBridgeHeight(TileIndex t)
{
uint h;
uint tileh = GetTileSlope(t, &h);
uint f = GetBridgeFoundation(tileh, DiagDirToAxis(GetBridgeRampDirection(t)));
// one height level extra if the ramp is on a flat foundation
return
h + TILE_HEIGHT +
(IS_INT_INSIDE(f, 1, 15) ? TILE_HEIGHT : 0) +
(IsSteepSlope(tileh) ? TILE_HEIGHT : 0);
}
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