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/* $Id$ */

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/** @file bridge_map.cpp Map accessor functions for bridges. */

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#include "stdafx.h"

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#include "openttd.h"

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#include "bridge_map.h"

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#include "bridge.h"

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#include "variables.h"

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TileIndex GetBridgeEnd(TileIndex tile, DiagDirection dir)

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{

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	TileIndexDiff delta = TileOffsByDiagDir(dir);

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	dir = ReverseDiagDir(dir);

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	do {

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		tile += delta;

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	} while (!IsBridgeTile(tile) || GetBridgeRampDirection(tile) != dir);

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	return tile;

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}

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TileIndex GetNorthernBridgeEnd(TileIndex t)

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{

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	return GetBridgeEnd(t, ReverseDiagDir(AxisToDiagDir(GetBridgeAxis(t))));

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}

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TileIndex GetSouthernBridgeEnd(TileIndex t)

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{

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	return GetBridgeEnd(t, AxisToDiagDir(GetBridgeAxis(t)));

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}

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TileIndex GetOtherBridgeEnd(TileIndex tile)

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{

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	assert(IsBridgeTile(tile));

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	return GetBridgeEnd(tile, GetBridgeRampDirection(tile));

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}

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uint GetBridgeHeight(TileIndex t)

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{

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	uint h;

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	Slope tileh = GetTileSlope(t, &h);

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	uint f = GetBridgeFoundation(tileh, DiagDirToAxis(GetBridgeRampDirection(t)));

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	/* one height level extra if the ramp is on a flat foundation */

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	return

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		h + TILE_HEIGHT +

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		(IS_INT_INSIDE(f, 1, 15) ? TILE_HEIGHT : 0) +

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		(IsSteepSlope(tileh) ? TILE_HEIGHT : 0);

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}