From b4158f460d59dcc440e46d011d432bebbd42f7f5 Mon Sep 17 00:00:00 2001
From: Richard <q@1bpm.net>
Date: Thu, 18 Mar 2021 15:48:41 +0000
Subject: initial

---
 include/joystick.hpp | 128 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 128 insertions(+)
 create mode 100644 include/joystick.hpp

(limited to 'include')

diff --git a/include/joystick.hpp b/include/joystick.hpp
new file mode 100644
index 0000000..1c80b0d
--- /dev/null
+++ b/include/joystick.hpp
@@ -0,0 +1,128 @@
+// 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
+
+/**
+ * Encapsulates all data relevant to a sampled joystick event.
+ */
+class JoystickEvent
+{
+public:
+  /** Minimum value of axes range */
+  static const short MIN_AXES_VALUE = -32768;
+
+  /** Maximum value of axes range */
+  static const short MAX_AXES_VALUE = 32767;
+  
+  /**
+   * The timestamp of the event, in milliseconds.
+   */
+  unsigned int time;
+  
+  /**
+   * The value associated with this joystick event.
+   * For buttons this will be either 1 (down) or 0 (up).
+   * For axes, this will range between MIN_AXES_VALUE and MAX_AXES_VALUE.
+   */
+  short value;
+  
+  /**
+   * The event type.
+   */
+  unsigned char type;
+  
+  /**
+   * The axis/button number.
+   */
+  unsigned char number;
+
+  /**
+   * Returns true if this event is the result of a button press.
+   */
+  bool isButton()
+  {
+    return (type & JS_EVENT_BUTTON) != 0;
+  }
+
+  /**
+   * Returns true if this event is the result of an axis movement.
+   */
+  bool isAxis()
+  {
+    return (type & JS_EVENT_AXIS) != 0;
+  }
+
+  /**
+   * Returns true if this event is part of the initial state obtained when
+   * the joystick is first connected to.
+   */
+  bool isInitialState()
+  {
+    return (type & JS_EVENT_INIT) != 0;
+  }
+
+  /**
+   * The ostream inserter needs to be a friend so it can access the
+   * internal data structures.
+   */
+  friend std::ostream& operator<<(std::ostream& os, const JoystickEvent& e);
+};
+
+/**
+ * Stream insertion function so you can do this:
+ *    cout << event << endl;
+ */
+std::ostream& operator<<(std::ostream& os, const JoystickEvent& e);
+
+/**
+ * Represents a joystick device. Allows data to be sampled from it.
+ */
+class Joystick
+{
+private:
+  void openPath(std::string devicePath, bool blocking=false);
+  
+  int _fd;
+  
+public:
+  ~Joystick();
+
+
+  /**
+   * Initialises an instance for the joystick device specified.
+   */
+  void init(int joystickNumber);
+
+  /**
+   * Returns true if the joystick was found and may be used, otherwise false.
+   */
+  bool isFound();
+  
+  /**
+   * Attempts to populate the provided JoystickEvent instance with data
+   * from the joystick. Returns true if data is available, otherwise false.
+   */
+  bool sample(JoystickEvent* event);
+};
+
+#endif
-- 
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