/// <summary>
/// Validates whether the neighbour of this isometric tile in the given direction satisfies the
/// constraints of the tileset.
/// </summary>
/// <param name="dir">The direction of the neighbour to validate.</param>
private void ValidateNeighbour(MapDirection dir)
{
IsoTile neighbour = this.neighbours[(int)dir];
if (neighbour != null)
{
/// To simplify the algorithm, we use terrain combinations rotated to MapDirection.NorthEast.
TerrainCombination thisCombRot = MapHelper.RotateTerrainCombination(this.type.Combination, dir, MapDirection.NorthEast);
TerrainCombination neighCombRot = MapHelper.RotateTerrainCombination(neighbour.type.Combination, dir, MapDirection.NorthEast);
/// Generate the terrain-NESW array for this tile and the neighbour.
ITerrainType[] thisNESWRot = MapHelper.GetTerrainNESW(this.type.TerrainA, this.type.TerrainB, thisCombRot);
ITerrainType[] neighNESWRot = MapHelper.GetTerrainNESW(neighbour.type.TerrainA, neighbour.type.TerrainB, neighCombRot);
/// Check the generated terrain-NESW arrays.
if (thisNESWRot[0] != neighNESWRot[3] || thisNESWRot[1] != neighNESWRot[2])
{
throw new MapException(string.Format("Invalid neighbours at {0} and {1}!", this.mapCoords, neighbour.mapCoords));
}
/// Check whether the given direction satisfies the transition-length constraint.
if (this.type.TerrainB != null && this.type.TerrainB.TransitionLength > 0 &&
thisNESWRot[0] == this.type.TerrainA && thisNESWRot[1] == this.type.TerrainA)
{
int remaining = this.type.TerrainB.TransitionLength;
IsoTile currTile = neighbour;
while (currTile != null && remaining > 0)
{
/// Generate the terrain-NESW array of the currently checked tile.
TerrainCombination currCombRot = MapHelper.RotateTerrainCombination(currTile.type.Combination, dir, MapDirection.NorthEast);
ITerrainType[] currNESWRot = MapHelper.GetTerrainNESW(currTile.type.TerrainA, currTile.type.TerrainB, currCombRot);
/// Check if the currently checked tile is part of the transition.
if (currNESWRot[0] != this.type.TerrainA || currNESWRot[1] != this.type.TerrainA ||
currNESWRot[2] != this.type.TerrainA || currNESWRot[3] != this.type.TerrainA)
{
/// No, it's not part of the transition. We have to check whether the upcoming terrain type
/// is another child of TerrainA or not.
if (currNESWRot[2] == this.type.TerrainA && currNESWRot[3] == this.type.TerrainA &&
(currNESWRot[0] == this.type.TerrainA || currNESWRot[0].Parent == this.type.TerrainA) &&
(currNESWRot[1] == this.type.TerrainA || currNESWRot[1].Parent == this.type.TerrainA))
{
/// It's another child of TerrainA, no contradiction with the tileset -> OK.
break;
}
else
{
/// It's not a child of TerrainA -> Error.
throw new MapException(string.Format("Invalid transition from {0} in direction {1}! Length must be at least {2}!", this.mapCoords, dir, this.type.TerrainB.TransitionLength));
}
}
/// Yes, it's part of the transition. We can switch to the next tile in the same direction.
currTile = currTile.neighbours[(int)dir];
remaining--;
}
}
}
}
/// <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");
}
}
