public static Dir8 Rotate(this Dir8 dir, int n)
{
if (!dir.Validate())
{
throw new ArgumentOutOfRangeException(nameof(dir), dir, "Invalid enum value.");
}
if (dir == Dir8.None)
{
return(Dir8.None);
}
return((Dir8)(((int)dir + n) & (DIR8_COUNT - 1)));
}
public static Dir8 AddAngles(Dir8 dir1, Dir8 dir2)
{
// dir1 is validated by Dir8.Rotate
if (!dir2.Validate())
{
throw new ArgumentOutOfRangeException(nameof(dir2), dir2, "Invalid enum value.");
}
if (dir1 == Dir8.None || dir2 == Dir8.None)
{
return(Dir8.None);
}
return(dir1.Rotate((int)dir2));
}
public static bool IsDirBlocked(Loc loc, Dir8 dir, LocTest checkBlock, LocTest checkDiagBlock, int distance)
{
if (checkBlock == null)
{
throw new ArgumentNullException(nameof(checkBlock));
}
if (checkDiagBlock == null)
{
throw new ArgumentNullException(nameof(checkDiagBlock));
}
if (!dir.Validate())
{
throw new ArgumentException("Invalid value to check.");
}
else if (dir == Dir8.None)
{
return(false);
}
for (int ii = 0; ii < distance; ii++)
{
if (dir.IsDiagonal())
{
dir.Separate(out DirH horiz, out DirV vert);
Loc diagLoc = loc + horiz.GetLoc();
if (checkDiagBlock(diagLoc))
{
return(true);
}
diagLoc = loc + vert.GetLoc();
if (checkDiagBlock(diagLoc))
{
return(true);
}
}
loc += dir.GetLoc();
if (checkBlock(loc))
{
return(true);
}
}
return(false);
}
/// <summary>
/// Given a first entity at 0,0 and its facing direction, determines if the second entity is in front of the first entity.
/// </summary>
/// <param name="testLoc">Second entity location</param>
/// <param name="dir">First entity direction</param>
/// <param name="range">-1 for infinite range.</param>
/// <returns></returns>
public static bool InFront(Loc testLoc, Dir8 dir, int range)
{
if (!dir.Validate())
{
throw new ArgumentException("Invalid value to convert.");
}
if (testLoc == Loc.Zero)
{
return(true);
}
int foundRange = testLoc.Dist8();
if (range >= 0 && foundRange > range)
{
return(false);
}
return(dir.GetLoc() * foundRange == testLoc);
}
public static void Separate(this Dir8 dir, out DirH horiz, out DirV vert)
{
if (!dir.Validate())
{
throw new ArgumentOutOfRangeException(nameof(dir), dir, "Invalid enum value.");
}
switch (dir)
{
case Dir8.Down:
case Dir8.DownLeft:
case Dir8.DownRight:
vert = DirV.Down;
break;
case Dir8.Up:
case Dir8.UpLeft:
case Dir8.UpRight:
vert = DirV.Up;
break;
default:
vert = DirV.None;
break;
}
switch (dir)
{
case Dir8.Left:
case Dir8.UpLeft:
case Dir8.DownLeft:
horiz = DirH.Left;
break;
case Dir8.Right:
case Dir8.UpRight:
case Dir8.DownRight:
horiz = DirH.Right;
break;
default:
horiz = DirH.None;
break;
}
}
