/// <summary>This method is used to rotate the terrain combination of an isometric tile.</summary>
/// <param name="combination">The original terrain combination to be rotated.</param>
/// <param name="origDir">
/// The original direction vector of the isometric tile.
/// Can be one of the followings: MapDirection.NorthEast, MapDirection.SouthEast, MapDirection.SouthWest,
/// MapDirection.NorthWest.
/// </param>
/// <param name="newDir">
/// The new direction vector of the isometric tile.
/// Can be one of the followings: MapDirection.NorthEast, MapDirection.SouthEast, MapDirection.SouthWest,
/// MapDirection.NorthWest.
/// </param>
/// <returns>The rotated terrain combination of the tile.</returns>
public static TerrainCombination RotateTerrainCombination(TerrainCombination combination, MapDirection origDir, MapDirection newDir)
{
/// No rotation has to be performed in case of simple terrain combination.
if (combination == TerrainCombination.Simple)
{
return(combination);
}
if (newDir != MapDirection.NorthEast)
{
int modifiedOrigDir = ((int)MapDirection.NorthEast - (int)newDir + (int)origDir) % 8;
return(MapHelper.RotateTerrainCombination(combination,
(MapDirection)(modifiedOrigDir >= 0 ? modifiedOrigDir : modifiedOrigDir + 8),
MapDirection.NorthEast));
}
if (origDir == MapDirection.NorthEast)
{
/// No rotation has to be performed as the direction vector already points to MapDirection.NorthEast.
return(combination);
}
else if (origDir == MapDirection.SouthEast)
{
/// Rotate by +90 degrees.
if (combination == TerrainCombination.AAAB)
{
return(TerrainCombination.AABA);
}
if (combination == TerrainCombination.AABA)
{
return(TerrainCombination.ABAA);
}
if (combination == TerrainCombination.AABB)
{
return(TerrainCombination.ABBA);
}
if (combination == TerrainCombination.ABAA)
{
return(TerrainCombination.BAAA);
}
if (combination == TerrainCombination.ABAB)
{
return(TerrainCombination.BABA);
}
if (combination == TerrainCombination.ABBA)
{
return(TerrainCombination.BBAA);
}
if (combination == TerrainCombination.ABBB)
{
return(TerrainCombination.BBBA);
}
if (combination == TerrainCombination.BAAA)
{
return(TerrainCombination.AAAB);
}
if (combination == TerrainCombination.BAAB)
{
return(TerrainCombination.AABB);
}
if (combination == TerrainCombination.BABA)
{
return(TerrainCombination.ABAB);
}
if (combination == TerrainCombination.BABB)
{
return(TerrainCombination.ABBB);
}
if (combination == TerrainCombination.BBAA)
{
return(TerrainCombination.BAAB);
}
if (combination == TerrainCombination.BBAB)
{
return(TerrainCombination.BABB);
}
if (combination == TerrainCombination.BBBA)
{
return(TerrainCombination.BBAB);
}
throw new ArgumentException("Invalid terrain combination!", "combination");
}
else if (origDir == MapDirection.SouthWest)
{
/// Rotate by +180 degrees.
if (combination == TerrainCombination.AAAB)
{
return(TerrainCombination.ABAA);
}
if (combination == TerrainCombination.AABA)
{
return(TerrainCombination.BAAA);
}
if (combination == TerrainCombination.AABB)
{
return(TerrainCombination.BBAA);
}
if (combination == TerrainCombination.ABAA)
{
return(TerrainCombination.AAAB);
}
if (combination == TerrainCombination.ABAB)
{
return(TerrainCombination.ABAB);
}
if (combination == TerrainCombination.ABBA)
{
return(TerrainCombination.BAAB);
}
if (combination == TerrainCombination.ABBB)
{
return(TerrainCombination.BBAB);
}
if (combination == TerrainCombination.BAAA)
{
return(TerrainCombination.AABA);
}
if (combination == TerrainCombination.BAAB)
{
return(TerrainCombination.ABBA);
}
if (combination == TerrainCombination.BABA)
{
return(TerrainCombination.BABA);
}
if (combination == TerrainCombination.BABB)
{
return(TerrainCombination.BBBA);
}
if (combination == TerrainCombination.BBAA)
{
return(TerrainCombination.AABB);
}
if (combination == TerrainCombination.BBAB)
{
return(TerrainCombination.ABBB);
}
if (combination == TerrainCombination.BBBA)
{
return(TerrainCombination.BABB);
}
throw new ArgumentException("Invalid terrain combination!", "combination");
}
else if (origDir == MapDirection.NorthWest)
{
/// Rotate by +270 degrees.
if (combination == TerrainCombination.AAAB)
{
return(TerrainCombination.BAAA);
}
if (combination == TerrainCombination.AABA)
{
return(TerrainCombination.AAAB);
}
if (combination == TerrainCombination.AABB)
{
return(TerrainCombination.BAAB);
}
if (combination == TerrainCombination.ABAA)
{
return(TerrainCombination.AABA);
}
if (combination == TerrainCombination.ABAB)
{
return(TerrainCombination.BABA);
}
if (combination == TerrainCombination.ABBA)
{
return(TerrainCombination.AABB);
}
if (combination == TerrainCombination.ABBB)
{
return(TerrainCombination.BABB);
}
if (combination == TerrainCombination.BAAA)
{
return(TerrainCombination.ABAA);
}
if (combination == TerrainCombination.BAAB)
{
return(TerrainCombination.BBAA);
}
if (combination == TerrainCombination.BABA)
{
return(TerrainCombination.ABAB);
}
if (combination == TerrainCombination.BABB)
{
return(TerrainCombination.BBAB);
}
if (combination == TerrainCombination.BBAA)
{
return(TerrainCombination.ABBA);
}
if (combination == TerrainCombination.BBAB)
{
return(TerrainCombination.BBBA);
}
if (combination == TerrainCombination.BBBA)
{
return(TerrainCombination.ABBB);
}
throw new ArgumentException("Invalid terrain combination!", "combination");
}
else
{
throw new ArgumentException("Invalid direction vector!", "direction");
}
}