-- Abstract interface for 9 position joystick switches -- Copyright (C)2018-2023, Philip Munts dba Munts Technologies. -- -- Redistribution and use in source and binary forms, with or without -- modification, are permitted provided that the following conditions are met: -- -- * Redistributions of source code must retain the above copyright notice, -- this list of conditions and the following disclaimer. -- -- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" -- AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE -- IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE -- ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE -- LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR -- CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF -- SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS -- INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN -- CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) -- ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE -- POSSIBILITY OF SUCH DAMAGE. PACKAGE Joystick IS Joystick_Error : Exception; -- Joystick positions, named for the points of a compass TYPE Positions IS (Center, North, Northeast, East, Southeast, South, Southwest, West, Northwest); -- Define an abstract interface for joystick devices TYPE DeviceInterface IS INTERFACE; -- Define an access type compatible with any subclass implementing -- DeviceInterface TYPE Device IS ACCESS ALL DeviceInterface'Class; -- Joystick position method FUNCTION Position(Self : DeviceInterface) RETURN Positions IS ABSTRACT; -- Joystick pressed method FUNCTION Pressed(Self : DeviceInterface) RETURN Boolean IS ABSTRACT; END Joystick;