private static void AddWall(long direction, Point pos, Maze m)
{
int x = pos.X;
int y = pos.Y;
switch (direction)
{
case 1:
y--;
break;
case 2:
y++;
break;
case 3:
x--;
break;
case 4:
x++;
break;
}
m.AddWallAt(x, y);
}
