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   1 /**
   2  * Copyright (c) 2010-2023 Contributors to the openHAB project
   3  *
   4  * See the NOTICE file(s) distributed with this work for additional
   5  * information.
   6  *
   7  * This program and the accompanying materials are made available under the
   8  * terms of the Eclipse Public License 2.0 which is available at
   9  * http://www.eclipse.org/legal/epl-2.0
  10  *
  11  * SPDX-License-Identifier: EPL-2.0
  12  */
  13 package org.openhab.binding.leapmotion.internal.handler;
  14
  15 import static org.openhab.binding.leapmotion.internal.LeapMotionBindingConstants.*;
  16
  17 import java.util.concurrent.TimeUnit;
  18
  19 import org.eclipse.jdt.annotation.NonNullByDefault;
  20 import org.eclipse.jdt.annotation.Nullable;
  21 import org.openhab.core.thing.ChannelUID;
  22 import org.openhab.core.thing.Thing;
  23 import org.openhab.core.thing.ThingStatus;
  24 import org.openhab.core.thing.binding.BaseThingHandler;
  25 import org.openhab.core.types.Command;
  26 import org.slf4j.Logger;
  27 import org.slf4j.LoggerFactory;
  28
  29 import com.leapmotion.leap.CircleGesture;
  30 import com.leapmotion.leap.Controller;
  31 import com.leapmotion.leap.FingerList;
  32 import com.leapmotion.leap.Frame;
  33 import com.leapmotion.leap.Gesture;
  34 import com.leapmotion.leap.GestureList;
  35 import com.leapmotion.leap.Hand;
  36 import com.leapmotion.leap.Listener;
  37
  38 /**
  39  * The {@link LeapMotionHandler} is responsible for handling commands, which are
  40  * sent to one of the channels.
  41  *
  42  * @author Kai Kreuzer - Initial contribution
  43  * @author Thomas Eichstädt-Engelen - Initial version of listener logic
  44  *
  45  */
  46 @NonNullByDefault
  47 public class LeapMotionHandler extends BaseThingHandler {
  48
  49     private final Logger logger = LoggerFactory.getLogger(LeapMotionHandler.class);
  50
  51     private @NonNullByDefault({}) LeapMotionListener listener;
  52     private @NonNullByDefault({}) Controller leapController;
  53
  54     public LeapMotionHandler(Thing thing) {
  55         super(thing);
  56     }
  57
  58     @Override
  59     public void handleCommand(ChannelUID channelUID, Command command) {
  60     }
  61
  62     @Override
  63     public void initialize() {
  64         this.listener = new LeapMotionListener();
  65
  66         leapController = new Controller();
  67         leapController.setPolicyFlags(Controller.PolicyFlag.POLICY_BACKGROUND_FRAMES);
  68         leapController.addListener(this.listener);
  69         if (leapController.isConnected()) {
  70             updateStatus(ThingStatus.ONLINE);
  71         } else {
  72             updateStatus(ThingStatus.OFFLINE);
  73         }
  74     }
  75
  76     @Override
  77     public void dispose() {
  78         leapController.removeListener(this.listener);
  79         listener = null;
  80         leapController.delete();
  81         leapController = null;
  82     }
  83
  84     private class LeapMotionListener extends Listener {
  85
  86         private static final int RATE_LIMIT_IN_MS = 200;
  87         private long lastEvent = 0;
  88         private boolean noHand;
  89
  90         public LeapMotionListener() {
  91         }
  92
  93         @Override
  94         public void onConnect(@Nullable Controller controller) {
  95             if (controller != null) {
  96                 controller.enableGesture(Gesture.Type.TYPE_KEY_TAP);
  97                 controller.enableGesture(Gesture.Type.TYPE_CIRCLE);
  98             }
  99             updateStatus(ThingStatus.ONLINE);
 100         }
 101
 102         @Override
 103         public void onDisconnect(@Nullable Controller controller) {
 104             updateStatus(ThingStatus.OFFLINE);
 105         }
 106
 107         @Override
 108         public void onFrame(@Nullable Controller controller) {
 109             if (controller == null) {
 110                 return;
 111             }
 112             Frame frame = controller.frame();
 113
 114             GestureList gestures = frame.gestures();
 115             for (int i = 0; i < gestures.count(); i++) {
 116                 Gesture gesture = gestures.get(i);
 117                 switch (gesture.type()) {
 118                     case TYPE_KEY_TAP:
 119                         logger.debug("Key tap");
 120                         triggerChannel(CHANNEL_GESTURE, GESTURE_TAP);
 121                         break;
 122                     case TYPE_CIRCLE:
 123                         CircleGesture circle = new CircleGesture(gesture);
 124                         // Calculate clock direction using the angle between circle normal and pointable
 125                         boolean clockwiseness;
 126                         if (circle.pointable().direction().angleTo(circle.normal()) <= Math.PI / 4) {
 127                             // Clockwise if angle is less than 90 degrees
 128                             clockwiseness = true;
 129                         } else {
 130                             clockwiseness = false;
 131                         }
 132
 133                         // Calculate angle swept since last frame
 134                         if (circle.state() == com.leapmotion.leap.Gesture.State.STATE_UPDATE) {
 135                             if (System.nanoTime() > lastEvent + TimeUnit.MILLISECONDS.toNanos(RATE_LIMIT_IN_MS)) {
 136                                 logger.debug("Circle (clockwise={})", clockwiseness);
 137                                 if (clockwiseness) {
 138                                     triggerChannel(CHANNEL_GESTURE, GESTURE_CLOCKWISE);
 139                                 } else {
 140                                     triggerChannel(CHANNEL_GESTURE, GESTURE_ANTICLOCKWISE);
 141                                 }
 142                                 lastEvent = System.nanoTime();
 143                             }
 144                         }
 145                         break;
 146                     default:
 147                         logger.debug("Unknown gesture type.");
 148                         break;
 149                 }
 150             }
 151
 152             if (!frame.hands().isEmpty()) {
 153                 noHand = false;
 154                 // Get the first hand
 155                 Hand hand = frame.hands().get(0);
 156                 // Check if the hand has any fingers
 157                 FingerList fingers = hand.fingers();
 158                 if (System.nanoTime() > lastEvent + TimeUnit.MILLISECONDS.toNanos(RATE_LIMIT_IN_MS)) {
 159                     int height = (int) hand.palmPosition().getY();
 160                     logger.debug("Fingers shown {} @ {}", fingers.count(), height);
 161                     triggerChannel(CHANNEL_GESTURE, GESTURE_FINGERS + fingers.count() + "_" + height);
 162                     lastEvent = System.nanoTime();
 163                 }
 164             } else {
 165                 if (!noHand) {
 166                     noHand = true;
 167                     logger.debug("No hand");
 168                     triggerChannel(CHANNEL_GESTURE, GESTURE_NOHAND);
 169                 }
 170             }
 171         }
 172     }
 173 }