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authorRichard <q@1bpm.net>2021-03-18 15:48:41 +0000
committerRichard <q@1bpm.net>2021-03-18 15:48:41 +0000
commitb4158f460d59dcc440e46d011d432bebbd42f7f5 (patch)
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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
+
+/**
+ * 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