DrawListener.java

//package leap;

import java.awt.BasicStroke;
import java.awt.Color;
import java.util.ArrayList;

import processing.core.PApplet;

import com.leapmotion.leap.Controller;
//import com.leapmotion.leap.Finger;
//import com.leapmotion.leap.FingerList;
//import com.leapmotion.leap.Frame;
import com.leapmotion.leap.Gesture;
//import com.leapmotion.leap.GestureList;
//import com.leapmotion.leap.Hand;
import com.leapmotion.leap.Listener;
//import com.leapmotion.leap.Vector;
//import com.leapmotion.leap.Tool;
//import com.leapmotion.leap.ToolList;


import com.leapmotion.leap.Vector;

import de.voidplus.leapmotion.*;

public class DrawListener extends Listener {
    private Integer lastX, lastY;
    boolean draw = true;
    public Canvas canvas;
    public LeapMotion leap;

    public DrawListener(Canvas canvas, PApplet sketch) {
        this.canvas = canvas;
        //globalTool = null;
        leap = new LeapMotion(sketch);
    }

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

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

    public void onDisconnect(Controller controller) {
        // Note: not dispatched when running in a debugger.
        System.out.println("Disconnected");
    }

    public void onExit(Controller controller) {
        System.out.println("Exited");
    }

    public void onFrame(Controller controller) {
        com.leapmotion.leap.Frame frame = controller.frame();

        // Get the most recent frame and report some basic information

        if (!frame.hands().isEmpty()) {
            // Get the first hand
            //Hand hand = frame.hands().get(0);
            Hand hand = leap.getFrontHand();

            // Check if the hand has any fingers
            
            ArrayList fingers = hand.getFingers();
            if (!fingers.isEmpty()) {
                // Calculate the hand's average finger tip position
                Vector avgPos = Vector.zero();
//                for (Finger finger : fingers) {
//                    avgPos = avgPos.plus(finger.tipPosition());
//                }
                avgPos = avgPos.divide(fingers.size());
                int X = (int)convert(avgPos.get(0),0);// -350<x<350
                int Y = (int)convert(avgPos.get(1),1);// 20<y<730 flipped
                if (lastX != null && lastY != null) {
                    if (draw)
                        canvas.changeColorAndSize(Color.BLACK, new BasicStroke(
                                1));
                    else
                        canvas.changeColorAndSize(Color.WHITE, new BasicStroke(
                                20));
                    canvas.drawLineSegment(lastX, lastY, X, Y, Color.BLUE, 3);
                }
                lastX = X;
                lastY = Y;
            }
            else {
                  Tool tool = null;
             
                 // if (frame.tools().count() > 0) {
                  	//tool = frame.tools().get(0);   /// PICKING UP HERE!!!!!
                  	tool = hand.getFrontTool();
                  	//this.globalTool = frame.tools().get(0);
                  // Calculate the tool's tip position
                  Vector avgPos = Vector.zero();
                  //avgPos = avgPos.plus(tool.tipPosition());
                  int X = (int)convert(avgPos.get(0),0);// -350<x<350
                  int Y = (int)convert(avgPos.get(1),1);// 20<y<730 flipped
                  	if (lastX != null && lastY != null) {
                  		if (draw)
                  			canvas.changeColorAndSize(Color.BLACK, new BasicStroke(
                  					1));
                  		else
                  			canvas.changeColorAndSize(Color.WHITE, new BasicStroke(
                  					20));
                  		canvas.drawLineSegment(lastX, lastY, X, Y, Color.RED, 3);
                  	}
                  lastX = X;
                  lastY = Y;
                  //}
            }

        }
        // assuming that the frame has tool
        else {
            Tool tool = null;
            de.voidplus.leapmotion.Tool drawTool = null;
            if (frame.tools().count() > 0) {
            	//tool = frame.tools().get(0);   /// PICKING UP HERE!!!!!
            	//tool = hand.get
            	//this.globalTool = frame.tools().get(0);
            // Calculate the tool's tip position
            Vector avgPos = Vector.zero();
            //avgPos = avgPos.plus(tool.tipPosition());
            int X = (int)convert(avgPos.get(0),0);// -350<x<350
            int Y = (int)convert(avgPos.get(1),1);// 20<y<730 flipped
            if (lastX != null && lastY != null) {
                if (draw)
                    canvas.changeColorAndSize(Color.BLACK, new BasicStroke(
                            1));
                else
                    canvas.changeColorAndSize(Color.WHITE, new BasicStroke(
                            20));
                canvas.drawLineSegment(lastX, lastY, X, Y, Color.RED, 3);
            }
            lastX = X;
            lastY = Y;
            }
        }

//        GestureList gestures = frame.gestures();
//        for (int i = 0; i < gestures.count(); i++) {
//            Gesture gesture = gestures.get(i);
//
//            switch (gesture.type()) {
//            case TYPE_SCREEN_TAP:
//                if (draw)
//                    draw = false;
//                else
//                    draw = true;
//                break;
//            default:
//                System.out.println("Unknown gesture type.");
//                break;
//            }
//        }
    }

    private float convert(float num, int dir) {
        switch (dir) {
        case 0:
            return (num+175)*500/350;
        case 1:
            return 500 - (num - 20) * 500 / 735;
        default:
            return 0;

        }
    }
}