LeapMotion Controller

LeapMotion Controller

The Basis of the controller :

The LeapMotion controller may extends com.leapmotion.leap.Listener.

this is an example of an empty LeapMotion controller.

Sample Code

public class LeapMotionController extends Listener{

//Called once, when this Listener object is newly added to a Controller.

@Override

public void onInit(Controller controller) {

}

//Called when the Controller object connects to the Leap Motion software and the Leap Motion hardware device is plugged in, or when this Listener object is added to a Controller that is already connected.

@Override

public void onConnect(Controller controller) {

//enable gesture detected by the leap, here we enable all the gesture.

controller.enableGesture(Gesture.Type.TYPE_SWIPE);

controller.enableGesture(Gesture.Type.TYPE_CIRCLE);

controller.enableGesture(Gesture.Type.TYPE_SCREEN_TAP);

controller.enableGesture(Gesture.Type.TYPE_KEY_TAP);

}

//Called when the Controller object disconnects from the Leap Motion software or the Leap Motion hardware is unplugged.

@Override

public void onDisconnect(Controller controller) {

// Note: not dispatched when running in a debugger.

}

//Called when this Listener object is removed from the Controller or the Controller instance is destroyed.

@Override

public void onExit(Controller controller) {

}

//Called when a new frame of hand and finger tracking data is available.

@Override

public void onFrame(Controller controller) {

}

}

For more information:

https://developer.leapmotion.com/documentation/v2/java/api/Leap.Listener.html

Using existing gesture :

The leapmotion library already detects four gestures: swipe, circle, screen tap, and key tap.

This is an example to use gesture in your code:

Sample Code

public void onFrame(Controller controller){

CircleGesture cg;

// the current frame

Frame frame = controller.frame();

// all gestures that have occurred since the specified frame.

GestureList gesture=frame.gestures();

for (Gesture g : gesture) {

//if the detected gesture is a Circle gesture.

if(g.type().equals(Gesture.Type.TYPE_CIRCLE)){

cg=new CircleGesture(g);

//if the CircleGesture is execute by a finger.

if(cg.pointable().isFinger()){

//do what you want.

}

}

}

}

for more information:

https://developer.leapmotion.com/documentation/v2/java/api/Leap.Gesture.html#id18

Fingers :

The following example is about how to detect fingers and use them.

Sample Code

public void onFrame(Controller controller) {

Frame frame = controller.frame();

//The list of Hand objects detected in this frame

HandList hands = frame.hands();

FingerList fingers;

for(Hand h :hands){

//he list of Finger objects detected in this frame that are attached to this hand

fingers=h.fingers();

//thumb

fingers.get(0);

//index finger

fingers.get(1);

//middle finger

fingers.get(2);

//ring finger

fingers.get(3);

//pinky

fingers.get(4);

}

}