private bool CanMoveTo(Position pos)
{
return pos.X < Width && pos.Y < Height &&
pos.X >= 0 && pos.Y >= 0;
}
public int this[Position p]
{
get { return this[p.X, p.Y]; }
set { this[p.X, p.Y] = value; }
}
public bool MoveBy(Position moveBy)
{
var current = this.CurrentPosition;
var newPos = current + moveBy;
if (!CanMoveTo(newPos))
return false;
this.MoveCount++;
var source = this[current];
var dest = this[newPos];
this[current] = dest;
this[newPos] = source;
this.CurrentPosition = newPos;
return true;
}