Sample.java

import java.io.IOException;

/******************************************************************************\
* Copyright (C) 2012 Leap Motion, Inc. All rights reserved.                    *
* NOTICE: This developer release of Leap Motion, Inc. software is confidential *
* and intended for very limited distribution. Parties using this software must *
* accept the SDK Agreement prior to obtaining this software and related tools. *
* This software is subject to copyright.                                       *
\******************************************************************************/

class SampleListener extends Listener {
  public void onInit(Controller controller) {
    System.out.println("Initialized");
  }

  public void onConnect(Controller controller) {
    System.out.println("Connected");
  }

  public void onDisconnect(Controller controller) {
    System.out.println("Disconnected");
  }

  public void onFrame(Controller controller) {
    // Get the most recent frame and report some basic information
    Frame frame = controller.frame();
    HandArray hands = frame.hands();
    long numHands = hands.size();
    System.out.println("Frame id: " + frame.id()
                     + ", timestamp: " + frame.timestamp()
                     + ", hands: " + numHands);

    if (numHands >= 1) {
      // Get the first hand
      Hand hand = hands.get(0);

      // Check if the hand has any fingers
      FingerArray fingers = hand.fingers();
      long numFingers = fingers.size();
      if (numFingers >= 1) {
        // Calculate the hand's average finger tip position
        Vector pos = new Vector(0, 0, 0);
        for (int i = 0; i < numFingers; ++i) {
          Finger finger = fingers.get(i);
          Ray tip = finger.tip();
          pos.setX(pos.getX() + tip.getPosition().getX());
          pos.setY(pos.getY() + tip.getPosition().getY());
          pos.setZ(pos.getZ() + tip.getPosition().getZ());
        }
        pos = new Vector(pos.getX()/numFingers, pos.getY()/numFingers, pos.getZ()/numFingers);
        System.out.println("Hand has " + numFingers + " fingers with average tip position"
                         + " (" + pos.getX() + ", " + pos.getY() + ", " + pos.getZ() + ")");
      }

      // Check if the hand has a palm
      Ray palmRay = hand.palm();
      if (palmRay != null) {
        // Get the palm position and wrist direction
        Vector palm = palmRay.getPosition();
        Vector wrist = palmRay.getDirection();
        String direction = "";
        if (wrist.getX() > 0)
          direction = "left";
        else
          direction = "right";
        System.out.println("Hand is pointing to the " + direction + " with palm position"
                         + " (" + palm.getX() + ", " + palm.getY() + ", " + palm.getZ() + ")");
      }
    }
  }
}

class Sample {
  public static void main(String[] args) {
    // Create a sample listener and assign it to a controller to receive events
    SampleListener listener = new SampleListener();
    Controller controller = new Controller(listener);

    // Keep this process running until Enter is pressed
    System.out.println("Press Enter to quit...");
    try {
		System.in.read();
	} catch (IOException e) {
		
	}

    //The controller must be disposed of before the listener
    controller = null;
  }
}