joystick.hpp

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// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// Copyright Drew Noakes 2013-2016
 
#ifndef __JOYSTICK_HH__
#define __JOYSTICK_HH__
 
#include <string>
#include <iostream>
 
#define JS_EVENT_BUTTON 0x01 // button pressed/released
#define JS_EVENT_AXIS   0x02 // joystick moved
#define JS_EVENT_INIT   0x80 // initial state of device
 
class JoystickEvent
{
public:
  static const short MIN_AXES_VALUE = -32768;
 
  static const short MAX_AXES_VALUE = 32767;
  
  unsigned int time;
  
  short value;
  
  unsigned char type;
  
  unsigned char number;
 
  bool isButton()
  {
    return (type & JS_EVENT_BUTTON) != 0;
  }
 
  bool isAxis()
  {
    return (type & JS_EVENT_AXIS) != 0;
  }
 
  bool isInitialState()
  {
    return (type & JS_EVENT_INIT) != 0;
  }
 
  friend std::ostream& operator<<(std::ostream& os, const JoystickEvent& e);
};
 
std::ostream& operator<<(std::ostream& os, const JoystickEvent& e);
 
class Joystick
{
private:
  void openPath(std::string devicePath, bool blocking=false);
  
  int _fd;
  
public:
  ~Joystick();
 
  Joystick();
 
  Joystick(int joystickNumber);
 
  Joystick(std::string devicePath);
 
  Joystick(Joystick const&) = delete;
 
  Joystick(Joystick &&) = default;
 
  Joystick(std::string devicePath, bool blocking);
 
  bool isFound();
  
  bool sample(JoystickEvent* event);
};
 
#endif