devices/Joystick.h

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#ifndef SDL_DEVICES_JOYSTICK_H
#define SDL_DEVICES_JOYSTICK_H

#include <string>
#include <stdexcept>
#include <utility>

#include <SDL.h>

#include "sdlpp/subsystem/Subsystem.h"
#include "sdlpp/event/Components.h"

namespace sdl {
namespace devices {
  using namespace misc;

    class Joystick {
        public:
            Joystick (int index) : joystick_ (open (index)) {
                SDL_PumpEvents ();
                SDL_Event* joyEvents = new SDL_Event[18];
                SDL_PeepEvents (joyEvents, 18, SDL_GETEVENT, SDL_EVENTMASK (SDL_JOYAXISMOTION) | SDL_EVENTMASK (SDL_JOYBUTTONUP) | SDL_EVENTMASK (SDL_JOYBUTTONDOWN));
                delete[] joyEvents;
            };

            ~Joystick () { SDL_JoystickClose (joystick_); };

            std::string name () { return SDL_JoystickName (SDL_JoystickIndex (joystick_)); };

            int index () { return SDL_JoystickIndex (joystick_); };
            
            int numAxes () { return SDL_JoystickNumAxes (joystick_); };

            int numButtons () { return SDL_JoystickNumButtons (joystick_); };
            
            int numHats () { return SDL_JoystickNumHats (joystick_); };
            
            int numTrackballs () { return SDL_JoystickNumBalls (joystick_); };

            short axisPosition (int axis) { return SDL_JoystickGetAxis (joystick_, axis); };
            
            bool isPressed (int button) { return SDL_JoystickGetButton (joystick_, button) == 1; };

            char hatState (int hat) { return SDL_JoystickGetHat (joystick_, hat); };

            pair<int, int> trackballMotion (int trackball) {
                pair<int, int> res = make_pair (0, 0);
                if (SDL_JoystickGetBall (joystick_, trackball, &res.first, &res.second) == -1)
                    throw runtime_error ("Unable to determine trackball motion");
                return res;
            };

        private:
            Joystick (const Joystick& rhs);

            Joystick& operator= (const Joystick& rhs);

            SDL_Joystick* open (int index) {
                if (index > subsystem::Joystick::instance ().numJoysticks () - 1)
                    throw runtime_error ("Invalid joystick index.");

                SDL_Joystick* joystick = SDL_JoystickOpen (index);
                if (joystick == NULL) 
                    throw runtime_error ("Failed to open joystick.");
                return joystick;
            };

            SDL_Joystick* joystick_;
    }; //Joystick
}; //devices
}; //sdl

#endif //SDL_DEVICES_JOYSTICK_H