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/* $Id$ */
/** @file bridge_map.h Map accessor functions for bridges. */
#ifndef BRIDGE_MAP_H
#define BRIDGE_MAP_H
#include "direction_func.h"
#include "map.h"
#include "rail_type.h"
#include "road_map.h"
/**
* Checks if this is a bridge, instead of a tunnel
* @param t The tile to analyze
* @pre IsTileType(t, MP_TUNNELBRIDGE)
* @return true if the structure is a bridge one
*/
static inline bool IsBridge(TileIndex t)
{
assert(IsTileType(t, MP_TUNNELBRIDGE));
return HasBit(_m[t].m5, 7);
}
/**
* checks if there is a bridge on this tile
* @param t The tile to analyze
* @return true if a bridge is present
*/
static inline bool IsBridgeTile(TileIndex t)
{
return IsTileType(t, MP_TUNNELBRIDGE) && IsBridge(t);
}
/**
* checks for the possibility that a bridge may be on this tile
* These are in fact all the tile types on which a bridge can be found
* @param t The tile to analyze
* @return true if a bridge migh be present
*/
static inline bool MayHaveBridgeAbove(TileIndex t)
{
return
IsTileType(t, MP_CLEAR) ||
IsTileType(t, MP_RAILWAY) ||
IsTileType(t, MP_ROAD) ||
IsTileType(t, MP_WATER) ||
IsTileType(t, MP_TUNNELBRIDGE) ||
IsTileType(t, MP_UNMOVABLE);
}
/**
* checks if a bridge is set above the ground of this tile
* @param t The tile to analyze
* @pre MayHaveBridgeAbove(t)
* @return true if a bridge is detected above
*/
static inline bool IsBridgeAbove(TileIndex t)
{
assert(MayHaveBridgeAbove(t));
return GB(_m[t].m6, 6, 2) != 0;
}
/**
* Determines the type of bridge on a tile
* @param t The tile to analyze
* @pre IsBridgeTile(t)
* @return The bridge type
*/
static inline uint GetBridgeType(TileIndex t)
{
assert(IsBridgeTile(t));
return GB(_m[t].m2, 4, 4);
}
/**
* Get the axis of the bridge that goes over the tile. Not the axis or the ramp.
* @param t The tile to analyze
* @pre IsBridgeAbove(t)
* @return the above mentioned axis
*/
static inline Axis GetBridgeAxis(TileIndex t)
{
assert(IsBridgeAbove(t));
return (Axis)(GB(_m[t].m6, 6, 2) - 1);
}
/**
* Finds the end of a bridge in the specified direction starting at a middle tile
* @param t the bridge tile to find the bridge ramp for
* @param d the direction to search in
*/
TileIndex GetBridgeEnd(TileIndex t, DiagDirection d);
/**
* Finds the northern end of a bridge starting at a middle tile
* @param t the bridge tile to find the bridge ramp for
*/
TileIndex GetNorthernBridgeEnd(TileIndex t);
/**
* Finds the southern end of a bridge starting at a middle tile
* @param t the bridge tile to find the bridge ramp for
*/
TileIndex GetSouthernBridgeEnd(TileIndex t);
/**
* Starting at one bridge end finds the other bridge end
* @param t the bridge ramp tile to find the other bridge ramp for
*/
TileIndex GetOtherBridgeEnd(TileIndex t);
/**
* Get the height ('z') of a bridge in pixels.
* @param tile the bridge ramp tile to get the bridge height from
* @return the height of the bridge in pixels
*/
uint GetBridgeHeight(TileIndex tile);
/**
* Remove the bridge over the given axis.
* @param t the tile to remove the bridge from
* @param a the axis of the bridge to remove
* @pre MayHaveBridgeAbove(t)
*/
static inline void ClearSingleBridgeMiddle(TileIndex t, Axis a)
{
assert(MayHaveBridgeAbove(t));
ClrBit(_m[t].m6, 6 + a);
}
/**
* Removes bridges from the given, that is bridges along the X and Y axis.
* @param t the tile to remove the bridge from
* @pre MayHaveBridgeAbove(t)
*/
static inline void ClearBridgeMiddle(TileIndex t)
{
ClearSingleBridgeMiddle(t, AXIS_X);
ClearSingleBridgeMiddle(t, AXIS_Y);
}
/**
* Set that there is a bridge over the given axis.
* @param t the tile to add the bridge to
* @param a the axis of the bridge to add
* @pre MayHaveBridgeAbove(t)
*/
static inline void SetBridgeMiddle(TileIndex t, Axis a)
{
assert(MayHaveBridgeAbove(t));
SetBit(_m[t].m6, 6 + a);
}
/**
* Generic part to make a bridge ramp for both roads and rails.
* @param t the tile to make a bridge ramp
* @param o the new owner of the bridge ramp
* @param bridgetype the type of bridge this bridge ramp belongs to
* @param d the direction this ramp must be facing
* @param tt the transport type of the bridge
* @param rt the road or rail type
* @note this function should not be called directly.
*/
static inline void MakeBridgeRamp(TileIndex t, Owner o, uint bridgetype, DiagDirection d, TransportType tt, uint rt)
{
SetTileType(t, MP_TUNNELBRIDGE);
SetTileOwner(t, o);
_m[t].m2 = bridgetype << 4;
_m[t].m3 = rt;
_m[t].m4 = 0;
_m[t].m5 = 1 << 7 | tt << 2 | d;
}
/**
* Make a bridge ramp for roads.
* @param t the tile to make a bridge ramp
* @param o the new owner of the bridge ramp
* @param bridgetype the type of bridge this bridge ramp belongs to
* @param d the direction this ramp must be facing
* @param r the road type of the bridge
*/
static inline void MakeRoadBridgeRamp(TileIndex t, Owner o, uint bridgetype, DiagDirection d, RoadTypes r)
{
MakeBridgeRamp(t, o, bridgetype, d, TRANSPORT_ROAD, r);
}
/**
* Make a bridge ramp for rails.
* @param t the tile to make a bridge ramp
* @param o the new owner of the bridge ramp
* @param bridgetype the type of bridge this bridge ramp belongs to
* @param d the direction this ramp must be facing
* @param r the rail type of the bridge
*/
static inline void MakeRailBridgeRamp(TileIndex t, Owner o, uint bridgetype, DiagDirection d, RailType r)
{
MakeBridgeRamp(t, o, bridgetype, d, TRANSPORT_RAIL, r);
}
#endif /* BRIDGE_MAP_H */
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