//todo, old code had pairs...not sure what to do with these yet. add only if needed:
//public static int[][] FourDirectionPairs = { new int[] { 8, 2 }, new int[] { 6, 4 } };
//public static int[][] EightDirectionPairs = { new int[] { 8, 2 }, new int[] { 9, 1 }, new int[] { 6, 4 }, new int[] { 3, 7 } };
public static IEnumerable <Dir8> Enumerate(bool clockwise, bool includeNeutral, bool orthogonalsFirst, Dir8 startDir = Dir8.N)
{
if (includeNeutral)
{
yield return(Dir8.Neutral);
}
if (orthogonalsFirst)
{
Dir4 orthoDir, diagDir;
if (startDir.IsOrthogonal())
{
orthoDir = (Dir4)startDir;
diagDir = (Dir4)startDir.Rotate(clockwise);
}
else
{
orthoDir = (Dir4)startDir.Rotate(clockwise);
diagDir = (Dir4)startDir;
}
for (int i = 0; i < 4; ++i)
{
yield return((Dir8)orthoDir);
orthoDir = orthoDir.Rotate(clockwise);
}
for (int i = 0; i < 4; ++i)
{
yield return((Dir8)diagDir);
diagDir = diagDir.Rotate(clockwise);
}
}
else
{
for (int i = 0; i < 8; ++i)
{
yield return(startDir);
startDir = startDir.Rotate(clockwise);
}
}
}
