/// <summary>
/// Finds tile index that is closest to specified orientation.
/// </summary>
/// <param name="orientation">Bit mask of tile orientation.</param>
/// <returns>
/// Zero-based index of tile in tileset.
/// </returns>
public int FindClosestIndexFromOrientation(int orientation)
{
//int[] map = (_style == AutotileStyle.tIDE) ? s_OrientationMap4 : s_OrientationMap8;
int index = Array.IndexOf(s_OrientationMap8, orientation);
if (index != -1)
{
return(index);
}
int strongestConnections = 2;
int weakConnections = 0;
//int strongestOrientation = 0x00; // 00000000
index = /*(_style == AutotileStyle.tIDE) ? 0 :*/ 15;
for (int i = 0; i < s_OrientationMap8.Length; ++i)
{
int childOrientation = s_OrientationMap8[i];
// If there are at least 3 strong connections...
int s = OrientationUtility.CountStrongConnections(orientation, childOrientation);
if (s > strongestConnections)
{
// Strong connections overule any previous weak connection matches!
strongestConnections = s;
weakConnections = OrientationUtility.CountWeakConnections(orientation, childOrientation);
//strongestOrientation = childOrientation;
index = i;
}
else if (s == strongestConnections)
{
// Choose the connection that has the most weak connections!
int w = OrientationUtility.CountWeakConnections(orientation, childOrientation);
if (w > weakConnections)
{
//strongestOrientation = childOrientation;
index = i;
weakConnections = w;
}
}
}
return(index);
}
/// <summary>
/// Finds mask of orientation that best matches the specified orientation mask.
/// </summary>
/// <param name="mask">Bit mask of tile orientation.</param>
/// <returns>
/// Bit mask of the closest available orientation.
/// </returns>
public int FindClosestOrientationMask(int mask)
{
// Is desired orientation available?
if (this.FindOrientation(mask) != null)
{
return(mask);
}
// Find nearest match.
int strongestConnections = 2;
int weakConnections = 0;
int strongestOrientation = this.defaultOrientationMask;
int childOrientation, s, w;
if (FallbackMode == Tile.FallbackMode.NextBest)
{
for (int i = 0; i < this.orientations.Length; ++i)
{
childOrientation = this.orientations[i].Mask;
// If there are at least 3 strong connections...
s = OrientationUtility.CountStrongConnections(mask, childOrientation);
if (s > strongestConnections)
{
// Strong connections overule any previous weak connection matches!
strongestConnections = s;
weakConnections = OrientationUtility.CountWeakConnections(mask, childOrientation);
strongestOrientation = childOrientation;
}
// If this connection is just as strong as the previous then we can determine
// which one is better by looking at the weak connections.
else if (s == strongestConnections)
{
// Choose the connection that has the most weak connections!
w = OrientationUtility.CountWeakConnections(mask, childOrientation);
if (w > weakConnections)
{
strongestOrientation = childOrientation;
weakConnections = w;
}
}
}
}
else if (FallbackMode == Tile.FallbackMode.UseDefault)
{
for (int i = 0; i < this.orientations.Length; ++i)
{
childOrientation = this.orientations[i].Mask;
// When using default mode there must be exactly 4 strong connections!
if (OrientationUtility.CountStrongConnections(mask, childOrientation) == 4)
{
w = OrientationUtility.CountWeakConnections(mask, childOrientation);
// Has a strong connection been found for the first time?
// Otherwise, choose the connection that has the most weak connections!
if (strongestConnections == 2 || w > weakConnections)
{
strongestConnections = 4;
weakConnections = w;
strongestOrientation = childOrientation;
}
}
}
}
else if (FallbackMode == Tile.FallbackMode.UseDefaultStrict)
{
for (int i = 0; i < this.orientations.Length; ++i)
{
childOrientation = this.orientations[i].Mask;
// When using default mode there must be exactly 4 strong connections!
if (OrientationUtility.CountStrongConnections(mask, childOrientation) == 4 && OrientationUtility.CountWeakConnections(mask, childOrientation) == 4)
{
strongestOrientation = childOrientation;
}
}
}
return(strongestOrientation);
}
