public static LocRay4 GetWallDir(Loc loc, Grid.LocTest checkBlock, Grid.LocTest checkGround)
{
if (checkBlock == null)
{
throw new ArgumentNullException(nameof(checkBlock));
}
if (checkGround == null)
{
throw new ArgumentNullException(nameof(checkGround));
}
// check the four directions
Dir4 chosenDir = Dir4.None;
// ensure that there is only one direction where it is unblocked
foreach (Dir4 dir in DirExt.VALID_DIR4)
{
Loc newLoc = loc + dir.GetLoc();
if (checkGround(newLoc))
{
if (chosenDir != Dir4.None)
{
return(new LocRay4(loc));
}
else
{
chosenDir = dir.Reverse();
}
}
else if (!checkBlock(newLoc))
{
// all four directions must be valid ground, or valid block
return(new LocRay4(loc));
}
}
if (chosenDir == Dir4.None)
{
return(new LocRay4(loc));
}
// then check to make sure that the left and right diagonal of this direction are also valid blocked
Loc lLoc = loc + DirExt.AddAngles(chosenDir.ToDir8(), Dir8.DownLeft).GetLoc();
if (!checkBlock(lLoc))
{
return(new LocRay4(loc));
}
Loc rLoc = loc + DirExt.AddAngles(chosenDir.ToDir8(), Dir8.DownRight).GetLoc();
if (!checkBlock(rLoc))
{
return(new LocRay4(loc));
}
return(new LocRay4(loc, chosenDir));
}
public void ToDir8(Dir4 dir, Dir8 expected, bool exception = false)
{
if (exception)
{
Assert.Throws <ArgumentOutOfRangeException>(() => { dir.ToDir8(); });
}
else
{
Assert.That(dir.ToDir8(), Is.EqualTo(expected));
}
}
