public static Dir4 Rotate(this Dir4 dir, int n)
{
if (!dir.Validate())
{
throw new ArgumentOutOfRangeException(nameof(dir), dir, "Invalid enum value.");
}
if (dir == Dir4.None)
{
return(Dir4.None);
}
return((Dir4)(((int)dir + n) & (DIR4_COUNT - 1)));
}
public static Dir4 AddAngles(Dir4 dir1, Dir4 dir2)
{
// dir1 is validated by Dir4.Rotate
if (!dir2.Validate())
{
throw new ArgumentOutOfRangeException(nameof(dir2), dir2, "Invalid enum value.");
}
if (dir1 == Dir4.None || dir2 == Dir4.None)
{
return(Dir4.None);
}
return(dir1.Rotate((int)dir2));
}
