/**
* Add a TileIndexDiffC to a TileIndex and returns the new one.
*
* Returns tile + the diff given in diff. If the result tile would end up
* outside of the map, INVALID_TILE is returned instead.
*
* @param tile The base tile to add the offset on
* @param diff The offset to add on the tile
* @return The resulting TileIndex
*/
//inline
public static TileIndex AddTileIndexDiffCWrap(TileIndex tile, TileIndexDiffC diff)
{
var x = (uint)(TileX(tile) + diff.x);
var y = (uint)(TileY(tile) + diff.y);
/* Negative value will become big positive value after cast */
if (x >= MapSizeX() || y >= MapSizeY())
{
return(TileConstants.INVALID_TILE);
}
return(TileXY(x, y));
}
/**
* Return the offset between to tiles from a TileIndexDiffC struct.
*
* This function works like #TileDiffXY(int, int) and returns the
* difference between two tiles.
*
* @param tidc The coordinate of the offset as TileIndexDiffC
* @return The difference between two tiles.
* @see TileDiffXY(int, int)
*/
//inline
public static TileIndexDiff ToTileIndexDiff(TileIndexDiffC tidc)
{
return((tidc.y << (int)MapLogX()) + tidc.x);
}
