lmc_listener.cpp

Go to the documentation of this file.

#include "ros/ros.h"
#include <tf/transform_datatypes.h>

#include "leap_motion/Human.h"
#include "leap_motion/Hand.h"
#include "leap_motion/Finger.h"
#include "leap_motion/Bone.h"
#include "leap_motion/Gesture.h"

#include <iostream>

#include "../inc/lmc_listener.h"
#include "Leap.h"

using namespace Leap;

const std::string fingerNames[] = {"Thumb", "Index", "Middle", "Ring", "Pinky"};

LeapListener::LeapListener(){
    header_frame_id_ = "leap_hands";

    enable_controller_info_ = false;
    enable_frame_info_ = false;
    enable_hand_info_ = false;

    enable_gesture_circle_ = false;
    enable_gesture_swipe_ = false;
    enable_gesture_screen_tap_ = false;
    enable_gesture_key_tap_ = false;
}

LeapListener::LeapListener(bool args[7]){
    header_frame_id_ = "leap_hands";

    enable_controller_info_ = args[0];
    enable_frame_info_ = args[1];
    enable_hand_info_ = args[2];

    enable_gesture_circle_ = args[3];
    enable_gesture_swipe_ = args[4];
    enable_gesture_screen_tap_ = args[5];
    enable_gesture_key_tap_ = args[6];
}

void LeapListener::onConnect(const Controller& controller)
{
    if(LeapListener::enable_controller_info_)
    {   
        const DeviceList devices = controller.devices();
        for (int i = 0; i < devices.count(); ++i) 
        {
            ROS_INFO( "id: %s", devices[i].toString().c_str() );
            ROS_INFO("  isStreaming: %s", (devices[i].isStreaming() ? "true" : "false") );
        }
    }

    // A circular movement by a finger.
    if(LeapListener::enable_gesture_circle_)
    {
        controller.enableGesture(Leap::Gesture::TYPE_CIRCLE);
        if(LeapListener::enable_controller_info_)
        {
            ROS_INFO("Circle gesture has been enabled");
        }
    }

    // A straight line movement by the hand with fingers extended.
    if(LeapListener::enable_gesture_swipe_)
    {
        controller.enableGesture(Leap::Gesture::TYPE_SWIPE);
        if(LeapListener::enable_controller_info_)
        {
            ROS_INFO("Swipe gesture has been enabled");
        }
    }

    // A forward tapping movement by a finger. 
    if(LeapListener::enable_gesture_screen_tap_)
    {
        controller.enableGesture(Leap::Gesture::TYPE_SCREEN_TAP);
        if(LeapListener::enable_controller_info_)
        {
            ROS_INFO("Screen tap gesture has been enabled");
        }
    }

    // A downward tapping movement by a finger.
    if(LeapListener::enable_gesture_key_tap_)
    {
        controller.enableGesture(Leap::Gesture::TYPE_KEY_TAP);
        if(LeapListener::enable_controller_info_)
        {
            ROS_INFO("Key tap gesture has been enabled");
        }
    } 
};

void LeapListener::onInit(const Controller& controller)
{
    if(LeapListener::enable_controller_info_)
    {
        ROS_INFO("Listener has been initialized");
    }
};

void LeapListener::onDisconnect(const Controller& controller)
{
    if(LeapListener::enable_controller_info_)
    {
        ROS_INFO("Device disconnected");
    }
};

void LeapListener::onExit(const Controller& controller)
{
    if(LeapListener::enable_controller_info_)
    {
        ROS_INFO("Listener object removed from the device");
    }
};

void LeapListener::onFrame(const Controller& controller) 
{
    const Frame frame = controller.frame();
    ros::Time timestamp = ros::Time::now();

    // Create an instance of leap_motion::human message
    // and fill it with all the possible data from the Leap Motion controller
    leap_motion::Human ros_human_msg;
    ros_human_msg.header.stamp = timestamp;
    ros_human_msg.header.frame_id = LeapListener::header_frame_id_;
    ros_human_msg.lmc_frame_id = frame.id();
    ros_human_msg.nr_of_hands = frame.hands().count();
    ros_human_msg.nr_of_fingers = frame.fingers().count();
    ros_human_msg.nr_of_gestures = frame.gestures().count();
    ros_human_msg.current_frames_per_second = frame.currentFramesPerSecond();
    ros_human_msg.to_string = frame.toString();

    ros_human_msg.right_hand.is_present = false;
    ros_human_msg.left_hand.is_present = false;

    if(LeapListener::enable_frame_info_)
    {
        ROS_INFO("Frame id: %lu, timestamp: %f, hands: %i, fingers: %i, gestures: %i",
        frame.id(), timestamp.toSec(), frame.hands().count(), frame.fingers().count(),
        frame.gestures().count() );
    }

    // Get a list of all of the hands detected in the frame
    HandList hand_list = frame.hands();
    if(hand_list.count() > 2)
    {
        ROS_WARN("There are more than 2 hands in the frame! I see %i hands.", hand_list.count());
    }
    else
    {
        for (HandList::const_iterator current_hand = hand_list.begin(); current_hand != hand_list.end(); ++current_hand)
        {
            // Get a hand from the list
            const Hand hand = *current_hand;

            // Create an instance of leap_motion::Hand message
            // and fill it with all the possible data from the Leap::Hand object
            leap_motion::Hand ros_hand_msg;
            ros_hand_msg.header.stamp = timestamp;
            ros_hand_msg.header.frame_id = LeapListener::header_frame_id_;
            ros_hand_msg.lmc_hand_id = hand.id();
            ros_hand_msg.is_present = true;                     // Override the default value
            ros_hand_msg.valid_gestures = false;                // No gestures associated with this hand
            ros_hand_msg.confidence = hand.confidence();        // How confident the controller is with a given hand pose between [0,1] inclusive. 
            
            // Get hand's roll-pitch-yam and convert them into quaternion.
            // NOTE: Leap Motion roll-pith-yaw is from the perspective of human.
            // Here it is mapped that roll is about x-, pitch about y-, and yaw about z-axis.
            ros_hand_msg.roll = hand.direction().pitch();         // The roll angle in radians. 
            ros_hand_msg.pitch = hand.direction().yaw();          // The pitch angle in radians.
            ros_hand_msg.yaw = hand.palmNormal().roll();          // The yaw angle in radians.

            ros_hand_msg.grab_strength = hand.grabStrength();     // The angle between the fingers and the hand of a grab hand pose. 
            ros_hand_msg.palm_width = hand.palmWidth() / 1000.0;  // in m
            ros_hand_msg.pinch_strength = hand.pinchStrength();   // The distance between the thumb and index finger of a pinch hand pose.
            ros_hand_msg.time_visible = hand.timeVisible();       // The duration (in seconds) that this Hand has been tracked. 
            ros_hand_msg.to_string = hand.toString();

            // The rate of change of the palm position (x,y,z) in m/s.
            ros_hand_msg.palm_velocity.push_back(hand.palmVelocity()[0] / 1000.0); 
            ros_hand_msg.palm_velocity.push_back(hand.palmVelocity()[1] / 1000.0);
            ros_hand_msg.palm_velocity.push_back(hand.palmVelocity()[2] / 1000.0);

            // The center of a sphere fit to the curvature of this hand in m.
            ros_hand_msg.sphere_center.push_back(hand.sphereCenter()[0] / 1000.0); 
            ros_hand_msg.sphere_center.push_back(hand.sphereCenter()[1] / 1000.0); 
            ros_hand_msg.sphere_center.push_back(hand.sphereCenter()[2] / 1000.0);

            ros_hand_msg.sphere_radius = hand.sphereRadius() / 1000.0;   // in m

            // The position of the wrist of this hand in m.
            ros_hand_msg.wrist_position.push_back(hand.wristPosition()[0] / 1000.0);
            ros_hand_msg.wrist_position.push_back(hand.wristPosition()[1] / 1000.0);
            ros_hand_msg.wrist_position.push_back(hand.wristPosition()[2] / 1000.0);
            
            if(LeapListener::enable_hand_info_)
            {
                ROS_INFO("%s %s, id: %i, palm position: %s mm", std::string(2, ' ').c_str(), 
                (hand.isRight() ? "Right hand" : "Left hand"), hand.id(), hand.palmPosition().toString().c_str() ); 
            }

            // The center position of the palm in meters from the Leap Motion Controller origin. 
            ros_hand_msg.palm_center.x = hand.palmPosition().x / 1000.0;
            ros_hand_msg.palm_center.y = hand.palmPosition().y / 1000.0;
            ros_hand_msg.palm_center.z = hand.palmPosition().z / 1000.0;
            
            // This is a list of finger messages that will be attached to the hand message
            std::vector<leap_motion::Finger> finger_msg_list; 

            // Given in order from thumb[idx 0] to pinky[idx 4].
            const FingerList fingers = hand.fingers();
            for (FingerList::const_iterator fl = fingers.begin(); fl != fingers.end(); ++fl) 
            {
                // Get a finger from the list
                const Finger finger = *fl;

                leap_motion::Finger ros_finger_msg;
                ros_finger_msg.header.stamp = timestamp;
                ros_finger_msg.header.frame_id = LeapListener::header_frame_id_;
                ros_finger_msg.lmc_finger_id = finger.id();
                ros_finger_msg.type = finger.type();
                ros_finger_msg.length = finger.length() / 1000.0;
                ros_finger_msg.width = finger.width() / 1000.0;
                ros_finger_msg.to_string = finger.toString();

                if(LeapListener::enable_hand_info_)
                {
                    ROS_INFO("%s %s, id: %i, length: %f mm, width: %f mm", std::string(4, ' ').c_str(), 
                    fingerNames[finger.type()].c_str(), finger.id(), finger.length(), finger.width()); 
                }

                Bone bone;
                Bone::Type boneType;
                std::vector<leap_motion::Bone> bone_msg_list;
                for (int b = 0; b < 4; ++b) 
                {
                    // Get current fingers bone at index b
                    boneType = static_cast<Bone::Type>(b);
                    bone = finger.bone(boneType);

                    leap_motion::Bone ros_bone_msg;
                    ros_bone_msg.type = boneType;
                    ros_bone_msg.length = bone.length() / 1000.0; // in m
                    ros_bone_msg.width = bone.width() / 1000.0;   // in m
                    ros_bone_msg.to_string = bone.toString();     // human readable description of the Bone object
                    
                    ros_bone_msg.center.push_back(bone.center()[0] / 1000.0); // x in m
                    ros_bone_msg.center.push_back(bone.center()[1] / 1000.0); // y in m
                    ros_bone_msg.center.push_back(bone.center()[2] / 1000.0); // z in m

                    ros_bone_msg.bone_start.position.x = bone.prevJoint().x / 1000.0;
                    ros_bone_msg.bone_start.position.y = bone.prevJoint().y / 1000.0;
                    ros_bone_msg.bone_start.position.z = bone.prevJoint().z / 1000.0;
                    
                    ros_bone_msg.bone_end.position.x = bone.nextJoint().x / 1000.0;
                    ros_bone_msg.bone_end.position.y = bone.nextJoint().y / 1000.0;
                    ros_bone_msg.bone_end.position.z = bone.nextJoint().z / 1000.0;

                    bone_msg_list.push_back(ros_bone_msg);
                }
                
                ros_finger_msg.bone_list = bone_msg_list;
                finger_msg_list.push_back(ros_finger_msg);
            }
            
            ros_hand_msg.finger_list = finger_msg_list;
            
            // Check if there are any gestures assosciated wih this frame
            // if there are, connect them with the correct hand
            if (!frame.gestures().isEmpty())
            {
                std::vector<leap_motion::Gesture> gesture_msg_list; 
                ros_hand_msg.valid_gestures = true;

                Leap::GestureList gestures = frame.gestures();
                for(Leap::GestureList::const_iterator gl = gestures.begin(); gl != gestures.end(); gl++)
                {
                    // Check what hands are connected with a particular gesture
                    Leap::HandList hands_for_gesture = (*gl).hands();
                    for(unsigned int i = 0; i < hands_for_gesture.count(); i++)
                    {
                        if(*current_hand == hands_for_gesture[i])
                        {
                            leap_motion::Gesture ros_gesture_msg;
                            ros_gesture_msg.lmc_gesture_id = (*gl).id();
                            ros_gesture_msg.duration_us = (*gl).duration();
                            ros_gesture_msg.duration_s = (*gl).durationSeconds();
                            ros_gesture_msg.is_valid = (*gl).isValid();
                            ros_gesture_msg.gesture_state = (*gl).state();
                            ros_gesture_msg.gesture_type = (*gl).type();
                            ros_gesture_msg.to_string = (*gl).toString();
                            
                            // Appends the ids of pointable objects related with this gesture
                            Leap::PointableList pointables_for_gesture = (*gl).pointables();
                            std::vector<int32_t> pointable_ids;
                            for(unsigned int j = 0; j < pointables_for_gesture.count(); j++)
                            {
                                pointable_ids.push_back( pointables_for_gesture[j].id() );
                            }
                            
                            ros_gesture_msg.pointable_ids = pointable_ids;
                            gesture_msg_list.push_back(ros_gesture_msg);
                        }
                    }
                }
                ros_hand_msg.gesture_list = gesture_msg_list;
            }
            
            if( hand.isRight() )
            {
                ros_human_msg.right_hand = ros_hand_msg;
            }
            else
            {
                ros_human_msg.left_hand = ros_hand_msg;
            }
        }
        ros_publisher.publish(ros_human_msg);
    }
};