cpp/openttd-patchpack/source Files · src/tunnel_map.cpp

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Location: cpp/openttd-patchpack/source/src/tunnel_map.cpp

r7939:523d421f9d0c 1.6 KiB text/x-c Show Annotation Show as Raw Download as Raw

egladil

(svn r11492) -Codechange: [OSX] Split the cocoa video driver into several files. The reason for this is that the fullscreen and windowed mode api are separate from each other in OS X and thus the driver actual is two drivers in one. This split is to make the code more readable and to prepare for replacing the Quickdraw windowed mode code which uses apis deprecated as of OS X 10.5 (and maybe earlier).

/* $Id$ */

/** @file tunnel_map.cpp */

#include "stdafx.h"
#include "openttd.h"
#include "tile.h"
#include "tunnel_map.h"

/**
 * Gets the other end of the tunnel. Where a vehicle would reappear when it
 * enters at the given tile.
 * @param tile the tile to search from.
 * @return the tile of the other end of the tunnel.
 */
TileIndex GetOtherTunnelEnd(TileIndex tile)
{
	DiagDirection dir = GetTunnelDirection(tile);
	TileIndexDiff delta = TileOffsByDiagDir(dir);
	uint z = GetTileZ(tile);

	dir = ReverseDiagDir(dir);
	do {
		tile += delta;
	} while (
		!IsTunnelTile(tile) ||
		GetTunnelDirection(tile) != dir ||
		GetTileZ(tile) != z
	);

	return tile;
}


/**
 * Is there a tunnel in the way in the given direction?
 * @param tile the tile to search from.
 * @param z    the 'z' to search on.
 * @param dir  the direction to start searching to.
 * @return true if and only if there is a tunnel.
 */
bool IsTunnelInWayDir(TileIndex tile, uint z, DiagDirection dir)
{
	TileIndexDiff delta = TileOffsByDiagDir(dir);
	uint height;

	do {
		tile -= delta;
		height = GetTileZ(tile);
	} while (z < height);

	return
		z == height &&
		IsTunnelTile(tile) &&
		GetTunnelDirection(tile) == dir;
}

/**
 * Is there a tunnel in the way in any direction?
 * @param tile the tile to search from.
 * @param z the 'z' to search on.
 * @return true if and only if there is a tunnel.
 */
bool IsTunnelInWay(TileIndex tile, uint z)
{
	return
		IsTunnelInWayDir(tile, z, (TileX(tile) > (MapMaxX() / 2)) ? DIAGDIR_NE : DIAGDIR_SW) ||
		IsTunnelInWayDir(tile, z, (TileY(tile) > (MapMaxY() / 2)) ? DIAGDIR_NW : DIAGDIR_SE);
}