if(down)
            {
                if(left)
                {
                    ex += SHIP_SPEED_DIAG;
                    ey -= SHIP_SPEED_DIAG;
                }
                else
                {
                    if(right)
                    {
                        ex -= SHIP_SPEED_DIAG;
                        ey -= SHIP_SPEED_DIAG;
                    }
                    else
                        ey -= SHIP_SPEED;
                }
            }
            else
            {
                if(up)
                {
                    if(left)
                    {
                        ex += SHIP_SPEED_DIAG;
                        ey += SHIP_SPEED_DIAG;
                    }
                    else
                    {
                        if(right)
                        {
                            ex -= SHIP_SPEED_DIAG;
                            ey += SHIP_SPEED_DIAG;
                        }
                        else
                        {
                            ey += SHIP_SPEED;
                        }
                    }
                }
                else
                {
                    if(left)
                        ex += SHIP_SPEED;
                    else if(right)
                        ex -= SHIP_SPEED;
                }
            }