private void UpdatePosition(Point a, MoveDir dir)
{
//trim out redundant back and forth movement
if (Dna.Count() > 1 && (int)dir == (int)(Dna.Last() + 2) % 4)
{
//reset our position back
switch (Dna.Last())
{
case MoveDir.N:
Pos = new Point(Pos.X, Pos.Y + 1);
break;
case MoveDir.W:
Pos = new Point(Pos.X + 1, Pos.Y);
break;
case MoveDir.S:
Pos = new Point(Pos.X, Pos.Y - 1);
break;
case MoveDir.E:
Pos = new Point(Pos.X - 1, Pos.Y);
break;
}
//remove last dna record
Dna.RemoveAt(Dna.Count() - 1);
Path.RemoveAt(Path.Count() - 1);
return;
}
Path.Add(a);
Pos = a;
Dna.Add(dir);
}
