roslib.js

(function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(require,module,exports){
/* eslint-disable no-unused-vars */
'use strict';
var hasOwnProperty = Object.prototype.hasOwnProperty;
var propIsEnumerable = Object.prototype.propertyIsEnumerable;


function toObject(val) {
  if (val === null || val === undefined) {
    throw new TypeError('Object.assign cannot be called with null or undefined');
  }

  return Object(val);
}

module.exports = Object.assign || function (target, source) {
  var from;
  var to = toObject(target);
  var symbols;

  for (var s = 1; s < arguments.length; s++) {
    from = Object(arguments[s]);

    for (var key in from) {
      if (hasOwnProperty.call(from, key)) {
        to[key] = from[key];
      }
    }

    if (Object.getOwnPropertySymbols) {
      symbols = Object.getOwnPropertySymbols(from);
      for (var i = 0; i < symbols.length; i++) {
        if (propIsEnumerable.call(from, symbols[i])) {
          to[symbols[i]] = from[symbols[i]];
        }
      }
    }
  }

  return to;
};

},{}],2:[function(require,module,exports){
/**
 * @fileOverview
 * @author Russell Toris - rctoris@wpi.edu
 */

/**
 * If you use roslib in a browser, all the classes will be exported to a global variable called ROSLIB.
 *
 * If you use nodejs, this is the variable you get when you require('roslib')
 */
var ROSLIB = this.ROSLIB || {
  REVISION : '0.18.0'
};

var assign = require('object-assign');

// Add core components
assign(ROSLIB, require('./core'));

assign(ROSLIB, require('./actionlib'));

assign(ROSLIB, require('./math'));

assign(ROSLIB, require('./tf'));

assign(ROSLIB, require('./urdf'));

module.exports = ROSLIB;

},{"./actionlib":7,"./core":16,"./math":21,"./tf":24,"./urdf":36,"object-assign":1}],3:[function(require,module,exports){
(function (global){
global.ROSLIB = require('./RosLib');
}).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
},{"./RosLib":2}],4:[function(require,module,exports){
/**
 * @fileOverview
 * @author Russell Toris - rctoris@wpi.edu
 */

var Topic = require('../core/Topic');
var Message = require('../core/Message');
var EventEmitter2 = require('eventemitter2').EventEmitter2;

/**
 * An actionlib action client.
 *
 * Emits the following events:
 *  * 'timeout' - if a timeout occurred while sending a goal
 *  * 'status' - the status messages received from the action server
 *  * 'feedback' -  the feedback messages received from the action server
 *  * 'result' - the result returned from the action server
 *
 *  @constructor
 *  @param options - object with following keys:
 *   * ros - the ROSLIB.Ros connection handle
 *   * serverName - the action server name, like /fibonacci
 *   * actionName - the action message name, like 'actionlib_tutorials/FibonacciAction'
 *   * timeout - the timeout length when connecting to the action server
 */
function ActionClient(options) {
  var that = this;
  options = options || {};
  this.ros = options.ros;
  this.serverName = options.serverName;
  this.actionName = options.actionName;
  this.timeout = options.timeout;
  this.omitFeedback = options.omitFeedback;
  this.omitStatus = options.omitStatus;
  this.omitResult = options.omitResult;
  this.goals = {};

  // flag to check if a status has been received
  var receivedStatus = false;

  // create the topics associated with actionlib
  var feedbackListener = new Topic({
    ros : this.ros,
    name : this.serverName + '/feedback',
    messageType : this.actionName + 'Feedback'
  });

  var statusListener = new Topic({
    ros : this.ros,
    name : this.serverName + '/status',
    messageType : 'actionlib_msgs/GoalStatusArray'
  });

  var resultListener = new Topic({
    ros : this.ros,
    name : this.serverName + '/result',
    messageType : this.actionName + 'Result'
  });

  this.goalTopic = new Topic({
    ros : this.ros,
    name : this.serverName + '/goal',
    messageType : this.actionName + 'Goal'
  });

  this.cancelTopic = new Topic({
    ros : this.ros,
    name : this.serverName + '/cancel',
    messageType : 'actionlib_msgs/GoalID'
  });

  // advertise the goal and cancel topics
  this.goalTopic.advertise();
  this.cancelTopic.advertise();

  // subscribe to the status topic
  if (!this.omitStatus) {
    statusListener.subscribe(function(statusMessage) {
      receivedStatus = true;
      statusMessage.status_list.forEach(function(status) {
        var goal = that.goals[status.goal_id.id];
        if (goal) {
          goal.emit('status', status);
        }
      });
    });
  }

  // subscribe the the feedback topic
  if (!this.omitFeedback) {
    feedbackListener.subscribe(function(feedbackMessage) {
      var goal = that.goals[feedbackMessage.status.goal_id.id];
      if (goal) {
        goal.emit('status', feedbackMessage.status);
        goal.emit('feedback', feedbackMessage.feedback);
      }
    });
  }

  // subscribe to the result topic
  if (!this.omitResult) {
    resultListener.subscribe(function(resultMessage) {
      var goal = that.goals[resultMessage.status.goal_id.id];

      if (goal) {
        goal.emit('status', resultMessage.status);
        goal.emit('result', resultMessage.result);
      }
    });
  }

  // If timeout specified, emit a 'timeout' event if the action server does not respond
  if (this.timeout) {
    setTimeout(function() {
      if (!receivedStatus) {
        that.emit('timeout');
      }
    }, this.timeout);
  }
}

ActionClient.prototype.__proto__ = EventEmitter2.prototype;

/**
 * Cancel all goals associated with this ActionClient.
 */
ActionClient.prototype.cancel = function() {
  var cancelMessage = new Message();
  this.cancelTopic.publish(cancelMessage);
};

module.exports = ActionClient;

},{"../core/Message":8,"../core/Topic":15,"eventemitter2":37}],5:[function(require,module,exports){
/**
 * @fileOverview
 * @author Russell Toris - rctoris@wpi.edu
 */

var Message = require('../core/Message');
var EventEmitter2 = require('eventemitter2').EventEmitter2;

/**
 * An actionlib goal goal is associated with an action server.
 *
 * Emits the following events:
 *  * 'timeout' - if a timeout occurred while sending a goal
 *
 *  @constructor
 *  @param object with following keys:
 *   * actionClient - the ROSLIB.ActionClient to use with this goal
 *   * goalMessage - The JSON object containing the goal for the action server
 */
function Goal(options) {
  var that = this;
  this.actionClient = options.actionClient;
  this.goalMessage = options.goalMessage;
  this.isFinished = false;

  // Used to create random IDs
  var date = new Date();

  // Create a random ID
  this.goalID = 'goal_' + Math.random() + '_' + date.getTime();
  // Fill in the goal message
  this.goalMessage = new Message({
    goal_id : {
      stamp : {
        secs : 0,
        nsecs : 0
      },
      id : this.goalID
    },
    goal : this.goalMessage
  });

  this.on('status', function(status) {
    that.status = status;
  });

  this.on('result', function(result) {
    that.isFinished = true;
    that.result = result;
  });

  this.on('feedback', function(feedback) {
    that.feedback = feedback;
  });

  // Add the goal
  this.actionClient.goals[this.goalID] = this;
}

Goal.prototype.__proto__ = EventEmitter2.prototype;

/**
 * Send the goal to the action server.
 *
 * @param timeout (optional) - a timeout length for the goal's result
 */
Goal.prototype.send = function(timeout) {
  var that = this;
  that.actionClient.goalTopic.publish(that.goalMessage);
  if (timeout) {
    setTimeout(function() {
      if (!that.isFinished) {
        that.emit('timeout');
      }
    }, timeout);
  }
};

/**
 * Cancel the current goal.
 */
Goal.prototype.cancel = function() {
  var cancelMessage = new Message({
    id : this.goalID
  });
  this.actionClient.cancelTopic.publish(cancelMessage);
};

module.exports = Goal;
},{"../core/Message":8,"eventemitter2":37}],6:[function(require,module,exports){
/**
 * @fileOverview
 * @author Laura Lindzey - lindzey@gmail.com
 */

var Topic = require('../core/Topic');
var Message = require('../core/Message');
var EventEmitter2 = require('eventemitter2').EventEmitter2;

/**
 * An actionlib action server client.
 *
 * Emits the following events:
 *  * 'goal' - goal sent by action client
 *  * 'cancel' - action client has canceled the request
 *
 *  @constructor
 *  @param options - object with following keys:
 *   * ros - the ROSLIB.Ros connection handle
 *   * serverName - the action server name, like /fibonacci
 *   * actionName - the action message name, like 'actionlib_tutorials/FibonacciAction'
 */

function SimpleActionServer(options) {
    var that = this;
    options = options || {};
    this.ros = options.ros;
    this.serverName = options.serverName;
    this.actionName = options.actionName;

    // create and advertise publishers
    this.feedbackPublisher = new Topic({
        ros : this.ros,
        name : this.serverName + '/feedback',
        messageType : this.actionName + 'Feedback'
    });
    this.feedbackPublisher.advertise();

    var statusPublisher = new Topic({
        ros : this.ros,
        name : this.serverName + '/status',
        messageType : 'actionlib_msgs/GoalStatusArray'
    });
    statusPublisher.advertise();

    this.resultPublisher = new Topic({
        ros : this.ros,
        name : this.serverName + '/result',
        messageType : this.actionName + 'Result'
    });
    this.resultPublisher.advertise();

    // create and subscribe to listeners
    var goalListener = new Topic({
        ros : this.ros,
        name : this.serverName + '/goal',
        messageType : this.actionName + 'Goal'
    });

    var cancelListener = new Topic({
        ros : this.ros,
        name : this.serverName + '/cancel',
        messageType : 'actionlib_msgs/GoalID'
    });

    // Track the goals and their status in order to publish status...
    this.statusMessage = new Message({
        header : {
            stamp : {secs : 0, nsecs : 100},
            frame_id : ''
        },
        status_list : []
    });

    // needed for handling preemption prompted by a new goal being received
    this.currentGoal = null; // currently tracked goal
    this.nextGoal = null; // the one that'll be preempting

    goalListener.subscribe(function(goalMessage) {
        
    if(that.currentGoal) {
            that.nextGoal = goalMessage;
            // needs to happen AFTER rest is set up
            that.emit('cancel');
    } else {
            that.statusMessage.status_list = [{goal_id : goalMessage.goal_id, status : 1}];
            that.currentGoal = goalMessage;
            that.emit('goal', goalMessage.goal);
    }
    });

    // helper function for determing ordering of timestamps
    // returns t1 < t2
    var isEarlier = function(t1, t2) {
        if(t1.secs > t2.secs) {
            return false;
        } else if(t1.secs < t2.secs) {
            return true;
        } else if(t1.nsecs < t2.nsecs) {
            return true;
        } else {
            return false;
        }
    };

    // TODO: this may be more complicated than necessary, since I'm
    // not sure if the callbacks can ever wind up with a scenario
    // where we've been preempted by a next goal, it hasn't finished
    // processing, and then we get a cancel message
    cancelListener.subscribe(function(cancelMessage) {

        // cancel ALL goals if both empty
        if(cancelMessage.stamp.secs === 0 && cancelMessage.stamp.secs === 0 && cancelMessage.id === '') {
            that.nextGoal = null;
            if(that.currentGoal) {
                that.emit('cancel');
            }
        } else { // treat id and stamp independently
            if(that.currentGoal && cancelMessage.id === that.currentGoal.goal_id.id) {
                that.emit('cancel');
            } else if(that.nextGoal && cancelMessage.id === that.nextGoal.goal_id.id) {
                that.nextGoal = null;
            }

            if(that.nextGoal && isEarlier(that.nextGoal.goal_id.stamp,
                                          cancelMessage.stamp)) {
                that.nextGoal = null;
            }
            if(that.currentGoal && isEarlier(that.currentGoal.goal_id.stamp,
                                             cancelMessage.stamp)) {
                
                that.emit('cancel');
            }
        }
    });

    // publish status at pseudo-fixed rate; required for clients to know they've connected
    var statusInterval = setInterval( function() {
        var currentTime = new Date();
        var secs = Math.floor(currentTime.getTime()/1000);
        var nsecs = Math.round(1000000000*(currentTime.getTime()/1000-secs));
        that.statusMessage.header.stamp.secs = secs;
        that.statusMessage.header.stamp.nsecs = nsecs;
        statusPublisher.publish(that.statusMessage);
    }, 500); // publish every 500ms

}

SimpleActionServer.prototype.__proto__ = EventEmitter2.prototype;

/**
*  Set action state to succeeded and return to client
*/

SimpleActionServer.prototype.setSucceeded = function(result2) {
    

    var resultMessage = new Message({
        status : {goal_id : this.currentGoal.goal_id, status : 3},
        result : result2
    });
    this.resultPublisher.publish(resultMessage);

    this.statusMessage.status_list = [];
    if(this.nextGoal) {
        this.currentGoal = this.nextGoal;
        this.nextGoal = null;
        this.emit('goal', this.currentGoal.goal);
    } else {
        this.currentGoal = null;
    }
};

/**
*  Function to send feedback
*/

SimpleActionServer.prototype.sendFeedback = function(feedback2) {

    var feedbackMessage = new Message({
        status : {goal_id : this.currentGoal.goal_id, status : 1},
        feedback : feedback2
    });
    this.feedbackPublisher.publish(feedbackMessage);
};

/**
*  Handle case where client requests preemption
*/

SimpleActionServer.prototype.setPreempted = function() {

    this.statusMessage.status_list = [];
    var resultMessage = new Message({
        status : {goal_id : this.currentGoal.goal_id, status : 2},
    });
    this.resultPublisher.publish(resultMessage);

    if(this.nextGoal) {
        this.currentGoal = this.nextGoal;
        this.nextGoal = null;
        this.emit('goal', this.currentGoal.goal);
    } else {
        this.currentGoal = null;
    }
};

module.exports = SimpleActionServer;
},{"../core/Message":8,"../core/Topic":15,"eventemitter2":37}],7:[function(require,module,exports){
var Ros = require('../core/Ros');
var mixin = require('../mixin');

var action = module.exports = {
    ActionClient: require('./ActionClient'),
    Goal: require('./Goal'),
    SimpleActionServer: require('./SimpleActionServer')
};

mixin(Ros, ['ActionClient', 'SimpleActionServer'], action);
},{"../core/Ros":10,"../mixin":22,"./ActionClient":4,"./Goal":5,"./SimpleActionServer":6}],8:[function(require,module,exports){
/**
 * @fileoverview
 * @author Brandon Alexander - baalexander@gmail.com
 */

var assign = require('object-assign');

/**
 * Message objects are used for publishing and subscribing to and from topics.
 *
 * @constructor
 * @param values - object matching the fields defined in the .msg definition file
 */
function Message(values) {
  assign(this, values);
}

module.exports = Message;
},{"object-assign":1}],9:[function(require,module,exports){
/**
 * @fileoverview
 * @author Brandon Alexander - baalexander@gmail.com
 */

var Service = require('./Service');
var ServiceRequest = require('./ServiceRequest');

/**
 * A ROS parameter.
 *
 * @constructor
 * @param options - possible keys include:
 *   * ros - the ROSLIB.Ros connection handle
 *   * name - the param name, like max_vel_x
 */
function Param(options) {
  options = options || {};
  this.ros = options.ros;
  this.name = options.name;
}

/**
 * Fetches the value of the param.
 *
 * @param callback - function with the following params:
 *  * value - the value of the param from ROS.
 */
Param.prototype.get = function(callback) {
  var paramClient = new Service({
    ros : this.ros,
    name : '/rosapi/get_param',
    serviceType : 'rosapi/GetParam'
  });

  var request = new ServiceRequest({
    name : this.name
  });

  paramClient.callService(request, function(result) {
    var value = JSON.parse(result.value);
    callback(value);
  });
};

/**
 * Sets the value of the param in ROS.
 *
 * @param value - value to set param to.
 */
Param.prototype.set = function(value, callback) {
  var paramClient = new Service({
    ros : this.ros,
    name : '/rosapi/set_param',
    serviceType : 'rosapi/SetParam'
  });

  var request = new ServiceRequest({
    name : this.name,
    value : JSON.stringify(value)
  });

  paramClient.callService(request, callback);
};

/**
 * Delete this parameter on the ROS server.
 */
Param.prototype.delete = function(callback) {
  var paramClient = new Service({
    ros : this.ros,
    name : '/rosapi/delete_param',
    serviceType : 'rosapi/DeleteParam'
  });

  var request = new ServiceRequest({
    name : this.name
  });

  paramClient.callService(request, callback);
};

module.exports = Param;
},{"./Service":11,"./ServiceRequest":12}],10:[function(require,module,exports){
/**
 * @fileoverview
 * @author Brandon Alexander - baalexander@gmail.com
 */

var WebSocket = require('ws');
var socketAdapter = require('./SocketAdapter.js');

var Service = require('./Service');
var ServiceRequest = require('./ServiceRequest');

var assign = require('object-assign');
var EventEmitter2 = require('eventemitter2').EventEmitter2;

/**
 * Manages connection to the server and all interactions with ROS.
 *
 * Emits the following events:
 *  * 'error' - there was an error with ROS
 *  * 'connection' - connected to the WebSocket server
 *  * 'close' - disconnected to the WebSocket server
 *  * <topicName> - a message came from rosbridge with the given topic name
 *  * <serviceID> - a service response came from rosbridge with the given ID
 *
 * @constructor
 * @param options - possible keys include:
 *   * url (optional) - the WebSocket URL for rosbridge (can be specified later with `connect`)
 */
function Ros(options) {
  options = options || {};
  this.socket = null;
  this.idCounter = 0;
  this.isConnected = false;

  if (typeof options.groovyCompatibility === 'undefined') {
    this.groovyCompatibility = true;
  }
  else {
    this.groovyCompatibility = options.groovyCompatibility;
  }

  // Sets unlimited event listeners.
  this.setMaxListeners(0);

  // begin by checking if a URL was given
  if (options.url) {
    this.connect(options.url);
  }
}

Ros.prototype.__proto__ = EventEmitter2.prototype;

/**
 * Connect to the specified WebSocket.
 *
 * @param url - WebSocket URL for Rosbridge
 */
Ros.prototype.connect = function(url) {
  this.socket = assign(new WebSocket(url), socketAdapter(this));
};

/**
 * Disconnect from the WebSocket server.
 */
Ros.prototype.close = function() {
  if (this.socket) {
    this.socket.close();
  }
};

/**
 * Sends an authorization request to the server.
 *
 * @param mac - MAC (hash) string given by the trusted source.
 * @param client - IP of the client.
 * @param dest - IP of the destination.
 * @param rand - Random string given by the trusted source.
 * @param t - Time of the authorization request.
 * @param level - User level as a string given by the client.
 * @param end - End time of the client's session.
 */
Ros.prototype.authenticate = function(mac, client, dest, rand, t, level, end) {
  // create the request
  var auth = {
    op : 'auth',
    mac : mac,
    client : client,
    dest : dest,
    rand : rand,
    t : t,
    level : level,
    end : end
  };
  // send the request
  this.callOnConnection(auth);
};

/**
 * Sends the message over the WebSocket, but queues the message up if not yet
 * connected.
 */
Ros.prototype.callOnConnection = function(message) {
  var that = this;
  var messageJson = JSON.stringify(message);

  if (!this.isConnected) {
    that.once('connection', function() {
      that.socket.send(messageJson);
    });
  } else {
    that.socket.send(messageJson);
  }
};

/**
 * Retrieves list of topics in ROS as an array.
 *
 * @param callback function with params:
 *   * topics - Array of topic names
 */
Ros.prototype.getTopics = function(callback, failedCallback) {
  var topicsClient = new Service({
    ros : this,
    name : '/rosapi/topics',
    serviceType : 'rosapi/Topics'
  });

  var request = new ServiceRequest();
  if (typeof failedCallback === 'function'){
    topicsClient.callService(request,
      function(result) {
        callback(result.topics);
      },
      function(message){
        failedCallback(message);
      }
    );
  }else{
    topicsClient.callService(request, function(result) {
      callback(result.topics);
    });
  }
};

/**
 * Retrieves Topics in ROS as an array as specific type
 *
 * @param topicType topic type to find:
 * @param callback function with params:
 *   * topics - Array of topic names
 */
Ros.prototype.getTopicsForType = function(topicType, callback, failedCallback) {
  var topicsForTypeClient = new Service({
    ros : this,
    name : '/rosapi/topics_for_type',
    serviceType : 'rosapi/TopicsForType'
  });

  var request = new ServiceRequest({
    type: topicType
  });
  if (typeof failedCallback === 'function'){
    topicsForTypeClient.callService(request,
      function(result) {
        callback(result.topics);
      },
      function(message){
        failedCallback(message);
      }
    );
  }else{
    topicsForTypeClient.callService(request, function(result) {
      callback(result.topics);
    });
  }
};

/**
 * Retrieves list of active service names in ROS.
 *
 * @param callback - function with the following params:
 *   * services - array of service names
 */
Ros.prototype.getServices = function(callback, failedCallback) {
  var servicesClient = new Service({
    ros : this,
    name : '/rosapi/services',
    serviceType : 'rosapi/Services'
  });

  var request = new ServiceRequest();
  if (typeof failedCallback === 'function'){
    servicesClient.callService(request,
      function(result) {
        callback(result.services);
      },
      function(message) {
        failedCallback(message);
      }
    );
  }else{
    servicesClient.callService(request, function(result) {
      callback(result.services);
    });
  }
};

/**
 * Retrieves list of services in ROS as an array as specific type
 *
 * @param serviceType service type to find:
 * @param callback function with params:
 *   * topics - Array of service names
 */
Ros.prototype.getServicesForType = function(serviceType, callback, failedCallback) {
  var servicesForTypeClient = new Service({
    ros : this,
    name : '/rosapi/services_for_type',
    serviceType : 'rosapi/ServicesForType'
  });

  var request = new ServiceRequest({
    type: serviceType
  });
  if (typeof failedCallback === 'function'){
    servicesForTypeClient.callService(request,
      function(result) {
        callback(result.services);
      },
      function(message) {
        failedCallback(message);
      }
    );
  }else{
    servicesForTypeClient.callService(request, function(result) {
      callback(result.services);
    });
  }
};

/**
 * Retrieves list of active node names in ROS.
 *
 * @param callback - function with the following params:
 *   * nodes - array of node names
 */
Ros.prototype.getNodes = function(callback, failedCallback) {
  var nodesClient = new Service({
    ros : this,
    name : '/rosapi/nodes',
    serviceType : 'rosapi/Nodes'
  });

  var request = new ServiceRequest();
  if (typeof failedCallback === 'function'){
    nodesClient.callService(request,
      function(result) {
        callback(result.nodes);
      },
      function(message) {
        failedCallback(message);
      }
    );
  }else{
    nodesClient.callService(request, function(result) {
      callback(result.nodes);
    });
  }
};

/**
 * Retrieves list of param names from the ROS Parameter Server.
 *
 * @param callback function with params:
 *  * params - array of param names.
 */
Ros.prototype.getParams = function(callback, failedCallback) {
  var paramsClient = new Service({
    ros : this,
    name : '/rosapi/get_param_names',
    serviceType : 'rosapi/GetParamNames'
  });
  var request = new ServiceRequest();
  if (typeof failedCallback === 'function'){
    paramsClient.callService(request,
      function(result) {
        callback(result.names);
      },
      function(message){
        failedCallback(message);
      }
    );
  }else{
    paramsClient.callService(request, function(result) {
      callback(result.names);
    });
  }
};

/**
 * Retrieves a type of ROS topic.
 *
 * @param topic name of the topic:
 * @param callback - function with params:
 *   * type - String of the topic type
 */
Ros.prototype.getTopicType = function(topic, callback, failedCallback) {
  var topicTypeClient = new Service({
    ros : this,
    name : '/rosapi/topic_type',
    serviceType : 'rosapi/TopicType'
  });
  var request = new ServiceRequest({
    topic: topic
  });

  if (typeof failedCallback === 'function'){
    topicTypeClient.callService(request,
      function(result) {
        callback(result.type);
      },
      function(message){
        failedCallback(message);
      }
    );
  }else{
    topicTypeClient.callService(request, function(result) {
      callback(result.type);
    });
  }
};

/**
 * Retrieves a type of ROS service.
 *
 * @param service name of service:
 * @param callback - function with params:
 *   * type - String of the service type
 */
Ros.prototype.getServiceType = function(service, callback, failedCallback) {
  var serviceTypeClient = new Service({
    ros : this,
    name : '/rosapi/service_type',
    serviceType : 'rosapi/ServiceType'
  });
  var request = new ServiceRequest({
    service: service
  });

  if (typeof failedCallback === 'function'){
    serviceTypeClient.callService(request,
      function(result) {
        callback(result.type);
      },
      function(message){
        failedCallback(message);
      }
    );
  }else{
    serviceTypeClient.callService(request, function(result) {
      callback(result.type);
    });
  }
};

/**
 * Retrieves a detail of ROS message.
 *
 * @param callback - function with params:
 *   * details - Array of the message detail
 * @param message - String of a topic type
 */
Ros.prototype.getMessageDetails = function(message, callback, failedCallback) {
  var messageDetailClient = new Service({
    ros : this,
    name : '/rosapi/message_details',
    serviceType : 'rosapi/MessageDetails'
  });
  var request = new ServiceRequest({
    type: message
  });

  if (typeof failedCallback === 'function'){
    messageDetailClient.callService(request,
      function(result) {
        callback(result.typedefs);
      },
      function(message){
        failedCallback(message);
      }
    );
  }else{
    messageDetailClient.callService(request, function(result) {
      callback(result.typedefs);
    });
  }
};

/**
 * Decode a typedefs into a dictionary like `rosmsg show foo/bar`
 *
 * @param defs - array of type_def dictionary
 */
Ros.prototype.decodeTypeDefs = function(defs) {
  var that = this;

  // calls itself recursively to resolve type definition using hints.
  var decodeTypeDefsRec = function(theType, hints) {
    var typeDefDict = {};
    for (var i = 0; i < theType.fieldnames.length; i++) {
      var arrayLen = theType.fieldarraylen[i];
      var fieldName = theType.fieldnames[i];
      var fieldType = theType.fieldtypes[i];
      if (fieldType.indexOf('/') === -1) { // check the fieldType includes '/' or not
        if (arrayLen === -1) {
          typeDefDict[fieldName] = fieldType;
        }
        else {
          typeDefDict[fieldName] = [fieldType];
        }
      }
      else {
        // lookup the name
        var sub = false;
        for (var j = 0; j < hints.length; j++) {
          if (hints[j].type.toString() === fieldType.toString()) {
            sub = hints[j];
            break;
          }
        }
        if (sub) {
          var subResult = decodeTypeDefsRec(sub, hints);
          if (arrayLen === -1) {
            typeDefDict[fieldName] = subResult;
          }
          else {
            typeDefDict[fieldName] = [subResult];
          }
        }
        else {
          that.emit('error', 'Cannot find ' + fieldType + ' in decodeTypeDefs');
        }
      }
    }
    return typeDefDict;
  };
  
  return decodeTypeDefsRec(defs[0], defs);
};


module.exports = Ros;

},{"./Service":11,"./ServiceRequest":12,"./SocketAdapter.js":14,"eventemitter2":37,"object-assign":1,"ws":38}],11:[function(require,module,exports){
/**
 * @fileoverview
 * @author Brandon Alexander - baalexander@gmail.com
 */

var ServiceResponse = require('./ServiceResponse');
var ServiceRequest = require('./ServiceRequest');
var EventEmitter2 = require('eventemitter2').EventEmitter2;

/**
 * A ROS service client.
 *
 * @constructor
 * @params options - possible keys include:
 *   * ros - the ROSLIB.Ros connection handle
 *   * name - the service name, like /add_two_ints
 *   * serviceType - the service type, like 'rospy_tutorials/AddTwoInts'
 */
function Service(options) {
  options = options || {};
  this.ros = options.ros;
  this.name = options.name;
  this.serviceType = options.serviceType;
  this.isAdvertised = false;

  this._serviceCallback = null;
}
Service.prototype.__proto__ = EventEmitter2.prototype;
/**
 * Calls the service. Returns the service response in the callback.
 *
 * @param request - the ROSLIB.ServiceRequest to send
 * @param callback - function with params:
 *   * response - the response from the service request
 * @param failedCallback - the callback function when the service call failed (optional). Params:
 *   * error - the error message reported by ROS
 */
Service.prototype.callService = function(request, callback, failedCallback) {
  if (this.isAdvertised) {
    return;
  }

  var serviceCallId = 'call_service:' + this.name + ':' + (++this.ros.idCounter);

  if (callback || failedCallback) {
    this.ros.once(serviceCallId, function(message) {
      if (message.result !== undefined && message.result === false) {
        if (typeof failedCallback === 'function') {
          failedCallback(message.values);
        }
      } else if (typeof callback === 'function') {
        callback(new ServiceResponse(message.values));
      }
    });
  }

  var call = {
    op : 'call_service',
    id : serviceCallId,
    service : this.name,
    args : request
  };
  this.ros.callOnConnection(call);
};

/**
 * Every time a message is published for the given topic, the callback
 * will be called with the message object.
 *
 * @param callback - function with the following params:
 *   * message - the published message
 */
Service.prototype.advertise = function(callback) {
  if (this.isAdvertised || typeof callback !== 'function') {
    return;
  }

  this._serviceCallback = callback;
  this.ros.on(this.name, this._serviceResponse.bind(this));
  this.ros.callOnConnection({
    op: 'advertise_service',
    type: this.serviceType,
    service: this.name
  });
  this.isAdvertised = true;
};

Service.prototype.unadvertise = function() {
  if (!this.isAdvertised) {
    return;
  }
  this.ros.callOnConnection({
    op: 'unadvertise_service',
    service: this.name
  });
  this.isAdvertised = false;
};

Service.prototype._serviceResponse = function(rosbridgeRequest) {
  var response = {};
  var success = this._serviceCallback(rosbridgeRequest.args, response);

  var call = {
    op: 'service_response',
    service: this.name,
    values: new ServiceResponse(response),
    result: success
  };

  if (rosbridgeRequest.id) {
    call.id = rosbridgeRequest.id;
  }

  this.ros.callOnConnection(call);
};

module.exports = Service;
},{"./ServiceRequest":12,"./ServiceResponse":13,"eventemitter2":37}],12:[function(require,module,exports){
/**
 * @fileoverview
 * @author Brandon Alexander - balexander@willowgarage.com
 */

var assign = require('object-assign');

/**
 * A ServiceRequest is passed into the service call.
 *
 * @constructor
 * @param values - object matching the fields defined in the .srv definition file
 */
function ServiceRequest(values) {
  assign(this, values);
}

module.exports = ServiceRequest;
},{"object-assign":1}],13:[function(require,module,exports){
/**
 * @fileoverview
 * @author Brandon Alexander - balexander@willowgarage.com
 */

var assign = require('object-assign');

/**
 * A ServiceResponse is returned from the service call.
 *
 * @constructor
 * @param values - object matching the fields defined in the .srv definition file
 */
function ServiceResponse(values) {
  assign(this, values);
}

module.exports = ServiceResponse;
},{"object-assign":1}],14:[function(require,module,exports){
/**
 * Socket event handling utilities for handling events on either
 * WebSocket and TCP sockets
 *
 * Note to anyone reviewing this code: these functions are called
 * in the context of their parent object, unless bound
 * @fileOverview
 */
'use strict';

var decompressPng = require('../util/decompressPng');
var WebSocket = require('ws');
var BSON = null;
if(typeof bson !== 'undefined'){
    BSON = bson().BSON;
}

/**
 * Events listeners for a WebSocket or TCP socket to a JavaScript
 * ROS Client. Sets up Messages for a given topic to trigger an
 * event on the ROS client.
 * 
 * @namespace SocketAdapter
 * @private
 */
function SocketAdapter(client) {
  function handleMessage(message) {
    if (message.op === 'publish') {
      client.emit(message.topic, message.msg);
    } else if (message.op === 'service_response') {
      client.emit(message.id, message);
    } else if (message.op === 'call_service') {
      client.emit(message.service, message);
    }
  }

  function handlePng(message, callback) {
    if (message.op === 'png') {
      decompressPng(message.data, callback);
    } else {
      callback(message);
    }
  }

  function decodeBSON(data, callback) {
    if (!BSON) {
      throw 'Cannot process BSON encoded message without BSON header.';
    }
    var reader = new FileReader();
    reader.onload  = function() {
      var uint8Array = new Uint8Array(this.result);
      var msg = BSON.deserialize(uint8Array);
      callback(msg);
    };
    reader.readAsArrayBuffer(data);
  }

  return {
    /**
     * Emits a 'connection' event on WebSocket connection.
     *
     * @param event - the argument to emit with the event.
     * @memberof SocketAdapter
     */
    onopen: function onOpen(event) {
      client.isConnected = true;
      client.emit('connection', event);
    },

    /**
     * Emits a 'close' event on WebSocket disconnection.
     *
     * @param event - the argument to emit with the event.
     * @memberof SocketAdapter
     */
    onclose: function onClose(event) {
      client.isConnected = false;
      client.emit('close', event);
    },

    /**
     * Emits an 'error' event whenever there was an error.
     *
     * @param event - the argument to emit with the event.
     * @memberof SocketAdapter
     */
    onerror: function onError(event) {
      client.emit('error', event);
    },

    /**
     * Parses message responses from rosbridge and sends to the appropriate
     * topic, service, or param.
     *
     * @param message - the raw JSON message from rosbridge.
     * @memberof SocketAdapter
     */
    onmessage: function onMessage(data) {
      if (typeof Blob !== 'undefined' && data.data instanceof Blob) {
        decodeBSON(data.data, function (message) {
          handlePng(message, handleMessage);
        });
      } else {
        var message = JSON.parse(typeof data === 'string' ? data : data.data);
        handlePng(message, handleMessage);
      }
    }
  };
}

module.exports = SocketAdapter;

},{"../util/decompressPng":40,"ws":38}],15:[function(require,module,exports){
/**
 * @fileoverview
 * @author Brandon Alexander - baalexander@gmail.com
 */

var EventEmitter2 = require('eventemitter2').EventEmitter2;
var Message = require('./Message');

/**
 * Publish and/or subscribe to a topic in ROS.
 *
 * Emits the following events:
 *  * 'warning' - if there are any warning during the Topic creation
 *  * 'message' - the message data from rosbridge
 *
 * @constructor
 * @param options - object with following keys:
 *   * ros - the ROSLIB.Ros connection handle
 *   * name - the topic name, like /cmd_vel
 *   * messageType - the message type, like 'std_msgs/String'
 *   * compression - the type of compression to use, like 'png'
 *   * throttle_rate - the rate (in ms in between messages) at which to throttle the topics
 *   * queue_size - the queue created at bridge side for re-publishing webtopics (defaults to 100)
 *   * latch - latch the topic when publishing
 *   * queue_length - the queue length at bridge side used when subscribing (defaults to 0, no queueing).
 */
function Topic(options) {
  options = options || {};
  this.ros = options.ros;
  this.name = options.name;
  this.messageType = options.messageType;
  this.isAdvertised = false;
  this.compression = options.compression || 'none';
  this.throttle_rate = options.throttle_rate || 0;
  this.latch = options.latch || false;
  this.queue_size = options.queue_size || 100;
  this.queue_length = options.queue_length || 0;

  // Check for valid compression types
  if (this.compression && this.compression !== 'png' &&
        this.compression !== 'none') {
    this.emit('warning', this.compression +
      ' compression is not supported. No compression will be used.');
  }

  // Check if throttle rate is negative
  if (this.throttle_rate < 0) {
    this.emit('warning', this.throttle_rate + ' is not allowed. Set to 0');
    this.throttle_rate = 0;
  }

  var that = this;
  this._messageCallback = function(data) {
    that.emit('message', new Message(data));
  };
}
Topic.prototype.__proto__ = EventEmitter2.prototype;

/**
 * Every time a message is published for the given topic, the callback
 * will be called with the message object.
 *
 * @param callback - function with the following params:
 *   * message - the published message
 */
Topic.prototype.subscribe = function(callback) {
  if (typeof callback === 'function') {
    this.on('message', callback);
  }

  if (this.subscribeId) { return; }
  this.ros.on(this.name, this._messageCallback);
  this.subscribeId = 'subscribe:' + this.name + ':' + (++this.ros.idCounter);
  this.ros.callOnConnection({
    op: 'subscribe',
    id: this.subscribeId,
    type: this.messageType,
    topic: this.name,
    compression: this.compression,
    throttle_rate: this.throttle_rate,
    queue_length: this.queue_length
  });
};

/**
 * Unregisters as a subscriber for the topic. Unsubscribing stop remove
 * all subscribe callbacks. To remove a call back, you must explicitly
 * pass the callback function in.
 *
 * @param callback - the optional callback to unregister, if
 *     * provided and other listeners are registered the topic won't
 *     * unsubscribe, just stop emitting to the passed listener
 */
Topic.prototype.unsubscribe = function(callback) {
  if (callback) {
    this.off('message', callback);
    // If there is any other callbacks still subscribed don't unsubscribe
    if (this.listeners('message').length) { return; }
  }
  if (!this.subscribeId) { return; }
  // Note: Don't call this.removeAllListeners, allow client to handle that themselves
  this.ros.off(this.name, this._messageCallback);
  this.emit('unsubscribe');
  this.ros.callOnConnection({
    op: 'unsubscribe',
    id: this.subscribeId,
    topic: this.name
  });
  this.subscribeId = null;
};

/**
 * Registers as a publisher for the topic.
 */
Topic.prototype.advertise = function() {
  if (this.isAdvertised) {
    return;
  }
  this.advertiseId = 'advertise:' + this.name + ':' + (++this.ros.idCounter);
  this.ros.callOnConnection({
    op: 'advertise',
    id: this.advertiseId,
    type: this.messageType,
    topic: this.name,
    latch: this.latch,
    queue_size: this.queue_size
  });
  this.isAdvertised = true;
};

/**
 * Unregisters as a publisher for the topic.
 */
Topic.prototype.unadvertise = function() {
  if (!this.isAdvertised) {
    return;
  }
  this.emit('unadvertise');
  this.ros.callOnConnection({
    op: 'unadvertise',
    id: this.advertiseId,
    topic: this.name
  });
  this.isAdvertised = false;
};

/**
 * Publish the message.
 *
 * @param message - A ROSLIB.Message object.
 */
Topic.prototype.publish = function(message) {
  if (!this.isAdvertised) {
    this.advertise();
  }

  this.ros.idCounter++;
  var call = {
    op: 'publish',
    id: 'publish:' + this.name + ':' + this.ros.idCounter,
    topic: this.name,
    msg: message,
    latch: this.latch
  };
  this.ros.callOnConnection(call);
};

module.exports = Topic;

},{"./Message":8,"eventemitter2":37}],16:[function(require,module,exports){
var mixin = require('../mixin');

var core = module.exports = {
    Ros: require('./Ros'),
    Topic: require('./Topic'),
    Message: require('./Message'),
    Param: require('./Param'),
    Service: require('./Service'),
    ServiceRequest: require('./ServiceRequest'),
    ServiceResponse: require('./ServiceResponse')
};

mixin(core.Ros, ['Param', 'Service', 'Topic'], core);

},{"../mixin":22,"./Message":8,"./Param":9,"./Ros":10,"./Service":11,"./ServiceRequest":12,"./ServiceResponse":13,"./Topic":15}],17:[function(require,module,exports){
/**
 * @fileoverview
 * @author David Gossow - dgossow@willowgarage.com
 */

var Vector3 = require('./Vector3');
var Quaternion = require('./Quaternion');

/**
 * A Pose in 3D space. Values are copied into this object.
 *
 *  @constructor
 *  @param options - object with following keys:
 *   * position - the Vector3 describing the position
 *   * orientation - the ROSLIB.Quaternion describing the orientation
 */
function Pose(options) {
  options = options || {};
  // copy the values into this object if they exist
  this.position = new Vector3(options.position);
  this.orientation = new Quaternion(options.orientation);
}

/**
 * Apply a transform against this pose.
 *
 * @param tf the transform
 */
Pose.prototype.applyTransform = function(tf) {
  this.position.multiplyQuaternion(tf.rotation);
  this.position.add(tf.translation);
  var tmp = tf.rotation.clone();
  tmp.multiply(this.orientation);
  this.orientation = tmp;
};

/**
 * Clone a copy of this pose.
 *
 * @returns the cloned pose
 */
Pose.prototype.clone = function() {
  return new Pose(this);
};

module.exports = Pose;
},{"./Quaternion":18,"./Vector3":20}],18:[function(require,module,exports){
/**
 * @fileoverview
 * @author David Gossow - dgossow@willowgarage.com
 */

/**
 * A Quaternion.
 *
 *  @constructor
 *  @param options - object with following keys:
 *   * x - the x value
 *   * y - the y value
 *   * z - the z value
 *   * w - the w value
 */
function Quaternion(options) {
  options = options || {};
  this.x = options.x || 0;
  this.y = options.y || 0;
  this.z = options.z || 0;
  this.w = (typeof options.w === 'number') ? options.w : 1;
}

/**
 * Perform a conjugation on this quaternion.
 */
Quaternion.prototype.conjugate = function() {
  this.x *= -1;
  this.y *= -1;
  this.z *= -1;
};

/**
 * Return the norm of this quaternion.
 */
Quaternion.prototype.norm = function() {
  return Math.sqrt(this.x * this.x + this.y * this.y + this.z * this.z + this.w * this.w);
};

/**
 * Perform a normalization on this quaternion.
 */
Quaternion.prototype.normalize = function() {
  var l = Math.sqrt(this.x * this.x + this.y * this.y + this.z * this.z + this.w * this.w);
  if (l === 0) {
    this.x = 0;
    this.y = 0;
    this.z = 0;
    this.w = 1;
  } else {
    l = 1 / l;
    this.x = this.x * l;
    this.y = this.y * l;
    this.z = this.z * l;
    this.w = this.w * l;
  }
};

/**
 * Convert this quaternion into its inverse.
 */
Quaternion.prototype.invert = function() {
  this.conjugate();
  this.normalize();
};

Quaternion.prototype.inverse = function(){
  var newX = -this.x;
  var newY = -this.y;
  var newZ = -this.z;
  this.x = newX;
  this.y = newY;
  this.z = newZ;
};
/**
 * Set the values of this quaternion to the product of itself and the given quaternion.
 *
 * @param q the quaternion to multiply with
 */
Quaternion.prototype.multiply = function(q) {
  var newX = this.x * q.w + this.y * q.z - this.z * q.y + this.w * q.x;
  var newY = -this.x * q.z + this.y * q.w + this.z * q.x + this.w * q.y;
  var newZ = this.x * q.y - this.y * q.x + this.z * q.w + this.w * q.z;
  var newW = -this.x * q.x - this.y * q.y - this.z * q.z + this.w * q.w;
  this.x = newX;
  this.y = newY;
  this.z = newZ;
  this.w = newW;
};

/**
 * Clone a copy of this quaternion.
 *
 * @returns the cloned quaternion
 */
Quaternion.prototype.clone = function() {
  return new Quaternion(this);
};

Quaternion.prototype.multiplyVector = function(v){
  var newX = this.w * v.x + this.y * v.z - this.z * v.y;
  var newY = this.w * v.y + this.z * v.x - this.x * v.z;
  var newZ = this.w * v.z + this.x * v.y - this.y * v.x;
  var newW = -this.x * v.x - this.y * v.y - this.z * v.z;
  return new Quaternion ({
    x : newX,
    y : newY,
    z : newZ,
    w : newW
  });
};

/**
*/
Quaternion.prototype.multiplyAssign = function(q){

var newX = this.w * q.x + this.x * q.w + this.y * q.z - this.z * q.y;
var newY = this.w * q.y + this.y * q.w + this.z * q.x - this.x * q.z;
var newZ = this.w * q.z + this.z * q.w + this.x * q.y - this.y * q.x;
var newW = this.w * q.w - this.x * q.x - this.y * q.y - this.z * q.z;
this.x = newX;
this.y = newY;
this.z = newZ;
this.w = newW;
};

module.exports = Quaternion;

},{}],19:[function(require,module,exports){
/**
 * @fileoverview
 * @author David Gossow - dgossow@willowgarage.com
 */

var Vector3 = require('./Vector3');
var Quaternion = require('./Quaternion');

/**
 * A Transform in 3-space. Values are copied into this object.
 *
 *  @constructor
 *  @param options - object with following keys:
 *   * translation - the Vector3 describing the translation
 *   * rotation - the ROSLIB.Quaternion describing the rotation
 */
function Transform(options) {
  options = options || {};
  // Copy the values into this object if they exist
  this.translation = new Vector3(options.translation);
  this.rotation = new Quaternion(options.rotation);
}

/**
 * Clone a copy of this transform.
 *
 * @returns the cloned transform
 */
Transform.prototype.clone = function() {
  return new Transform(this);
};

module.exports = Transform;
},{"./Quaternion":18,"./Vector3":20}],20:[function(require,module,exports){
/**
 * @fileoverview
 * @author David Gossow - dgossow@willowgarage.com
 */

/**
 * A 3D vector.
 *
 *  @constructor
 *  @param options - object with following keys:
 *   * x - the x value
 *   * y - the y value
 *   * z - the z value
 */
function Vector3(options) {
  options = options || {};
  this.x = options.x || 0;
  this.y = options.y || 0;
  this.z = options.z || 0;
}

/**
 * Set the values of this vector to the sum of itself and the given vector.
 *
 * @param v the vector to add with
 */
Vector3.prototype.add = function(v) {
  this.x += v.x;
  this.y += v.y;
  this.z += v.z;
};

/**
 * Set the values of this vector to the difference of itself and the given vector.
 *
 * @param v the vector to subtract with
 */
Vector3.prototype.subtract = function(v) {
  this.x -= v.x;
  this.y -= v.y;
  this.z -= v.z;
};

/**
 * Multiply the given Quaternion with this vector.
 *
 * @param q - the quaternion to multiply with
 */
Vector3.prototype.multiplyQuaternion = function(q) {
  var ix = q.w * this.x + q.y * this.z - q.z * this.y;
  var iy = q.w * this.y + q.z * this.x - q.x * this.z;
  var iz = q.w * this.z + q.x * this.y - q.y * this.x;
  var iw = -q.x * this.x - q.y * this.y - q.z * this.z;
  this.x = ix * q.w + iw * -q.x + iy * -q.z - iz * -q.y;
  this.y = iy * q.w + iw * -q.y + iz * -q.x - ix * -q.z;
  this.z = iz * q.w + iw * -q.z + ix * -q.y - iy * -q.x;
};

/**
 * Clone a copy of this vector.
 *
 * @returns the cloned vector
 */
Vector3.prototype.clone = function() {
  return new Vector3(this);
};

module.exports = Vector3;
},{}],21:[function(require,module,exports){
module.exports = {
    Pose: require('./Pose'),
    Quaternion: require('./Quaternion'),
    Transform: require('./Transform'),
    Vector3: require('./Vector3')
};

},{"./Pose":17,"./Quaternion":18,"./Transform":19,"./Vector3":20}],22:[function(require,module,exports){
/**
 * Mixin a feature to the core/Ros prototype.
 * For example, mixin(Ros, ['Topic'], {Topic: <Topic>})
 * will add a topic bound to any Ros instances so a user
 * can call `var topic = ros.Topic({name: '/foo'});`
 *
 * @author Graeme Yeates - github.com/megawac
 */
module.exports = function(Ros, classes, features) {
    classes.forEach(function(className) {
        var Class = features[className];
        Ros.prototype[className] = function(options) {
            options.ros = this;
            return new Class(options);
        };
    });
};

},{}],23:[function(require,module,exports){
/**
 * @fileoverview
 * @author David Gossow - dgossow@willowgarage.com
 */

var ActionClient = require('../actionlib/ActionClient');
var Goal = require('../actionlib/Goal');

var Service = require('../core/Service.js');
var ServiceRequest = require('../core/ServiceRequest.js');

var Transform = require('../math/Transform');
var Vector3 = require('../math/Vector3');
var Quaternion = require('../math/Quaternion');

/**
 * A TF Client that listens to TFs from tf2_web_republisher.
 *
 *  @constructor
 *  @param options - object with following keys:
 *   * ros - the ROSLIB.Ros connection handle
 *   * fixedFrame - the fixed frame, like /base_link
 *   * angularThres - the angular threshold for the TF republisher
 *   * transThres - the translation threshold for the TF republisher
 *   * rate - the rate for the TF republisher
 *   * updateDelay - the time (in ms) to wait after a new subscription
 *                   to update the TF republisher's list of TFs
 *   * topicTimeout - the timeout parameter for the TF republisher
 *   * serverName (optional) - the name of the tf2_web_republisher server
 *   * repubServiceName (optional) - the name of the republish_tfs service (non groovy compatibility mode only)
 *                                   default: '/republish_tfs'
 */
function TFClient(options) {
  options = options || {};
  this.ros = options.ros;
  this.fixedFrame = options.fixedFrame || '/base_link';
  this.angularThres = options.angularThres || 2.0;
  this.transThres = options.transThres || 0.01;
  this.rate = options.rate || 10.0;
  this.updateDelay = options.updateDelay || 50;
  this.iteration = 0;
  this.transforms_list = [];
  
  this.Tr_list = [];
  var seconds = options.topicTimeout || 2.0;
  var secs = Math.floor(seconds);
  var nsecs = Math.floor((seconds - secs) * 1000000000);
  this.topicTimeout = {
    secs: secs,
    nsecs: nsecs
  };
  this.serverName = options.serverName || '/py_tf2_web';
  this.repubServiceName = options.repubServiceName || '/republish_tfs';

  this.currentGoal = false;
  this.currentTopic = false;
  this.frameInfos = {};
  this.republisherUpdateRequested = false;

  // Create an Action client
  this.actionClient = this.ros.ActionClient({
    serverName : this.serverName,
    actionName : 'py_tf2_web/TFSubscriptionAction',
    omitStatus : true,
    omitResult : true
  });

  // Create a Service client
 this.serviceClient = this.ros.Service({
    name: this.repubServiceName,
    serviceType: 'py_tf2_web/RepublishTFs'
  });
}

/**
 * Process the incoming TF message and send them out using the callback
 * functions.
 *
 * @param tf - the TF message from the server
 */
TFClient.prototype.processTFArray = function(tf) {
  this.iteration += 1;
  this.Tr_list = [];
  
  /*new modification*/
  if (this.iteration === 1)
  {
    this.transforms_list = new Array();
  }
  tf.transforms.forEach(function(transform){
    var frameID = transform.transf.child_frame_id;
    var index = transform.index;
    if (frameID[0] === '/'){
      frameID = frameID.substring(1);
    }
    var info = this.frameInfos[frameID];
    info.link = frameID;
    if (info){
          info.transform = new Transform({
            translation : transform.transf.transform.translation,
            rotation : transform.transf.transform.rotation
    });
    }
    if (this.iteration === 1)
     this.transforms_list[this.transforms_list.length] = info;
    else 
      this.transforms_list[index] = info;
  }, this);
  
  var parent_index;
  var transformsLength = this.transforms_list.length;
  var i;
  var Tr;

  for (i = 0; i < transformsLength; i++){
    parent_index = this.parent_list[i];
    if (parent_index === -1){
      this.Tr_list[this.Tr_list.length] = this.transforms_list[i].transform;
    }
    else {

      var quat = new Quaternion (this.Tr_list[parent_index].rotation);
      var vec = this.quatRotate(quat, this.transforms_list[i].transform.translation);
      vec.add(this.Tr_list[parent_index].translation);
      quat.multiplyAssign(this.transforms_list[i].transform.rotation);
      Tr = new Transform({
        translation : vec,
        rotation : quat
      });

      this.Tr_list[this.Tr_list.length] = Tr;
    }
  }
  for(i = 0; i < transformsLength; i++){
    var info = this.transforms_list[i];
    info.cbs.forEach(function(cb){
        cb(this.Tr_list[i]);
    }, this);
    }
};

/**
 * Create and send a new goal (or service request) to the tf2_web_republisher
 * based on the current list of TFs.
 */
TFClient.prototype.updateGoal = function() {

  
  this.parent_list = [];
  var child;
  var parent;
  this.source_frames=[];
  
  for (var i=0; i<Object.keys(this.frameInfos).length; i++){
    child = Object.keys(this.frameInfos)[i];
    parent = this.frameInfos[child].parent;
    if (parent === 'root'){
      this.source_frames.push(child);
      this.parent_list.push(-1);
      break;
    }
  }
  for(var i=0; i<this.source_frames.length; i++){
    parent = this.source_frames[i];
    for (var j=0; j<Object.keys(this.frameInfos).length; j++){
      child = Object.keys(this.frameInfos)[j];
      if(this.frameInfos[child].parent === parent){
        this.source_frames.push(child);
        this.parent_list.push(i);
      }
    }
  }
  var goalMessage = {
    source_frames : this.source_frames,
    parent : this.parent_list,
    target_frame : this.fixedFrame,
    angular_thres : this.angularThres,
    trans_thres : this.transThres,
    rate : this.rate
  };

  goalMessage.timeout = this.topicTimeout;
  var request = new ServiceRequest(goalMessage);

  this.serviceClient.callService(request, this.processResponse.bind(this));
  
  this.republisherUpdateRequested = false;
};

/**
 * Process the service response and subscribe to the tf republisher
 * topic
 *
 * @param response the service response containing the topic name
 */
TFClient.prototype.processResponse = function(response) {
  // if we subscribed to a topic before, unsubscribe so
  // the republisher stops publishing it
  if (this.currentTopic) {
    this.currentTopic.unsubscribe();
  }

  this.currentTopic = this.ros.Topic({
    name: response.topic_name,
    messageType: 'py_tf2_web/TFArray'
  });
  this.currentTopic.subscribe(this.processTFArray.bind(this));
};

/**
 * Subscribe to the given TF frame.
 *
 * @param frameID - the TF frame to subscribe to
 * @param callback - function with params:
 *   * transform - the transform data
 */
TFClient.prototype.subscribe = function(frameID, parent, callback) {
  // remove leading slash, if it's there
  if (frameID[0] === '/')
  {
    frameID = frameID.substring(1);
  }
  // if there is no callback registered for the given frame, create emtpy callback list
  if (!this.frameInfos[frameID]) {
    this.frameInfos[frameID] = {
      cbs: [],
      parent: parent
    };
    if (!this.republisherUpdateRequested) {
      setTimeout(this.updateGoal.bind(this), this.updateDelay);
      this.republisherUpdateRequested = true;
    }
  }
  // if we already have a transform, call back immediately
  else if (this.frameInfos[frameID].transform) {
    callback(this.frameInfos[frameID].transform);
  }
  this.frameInfos[frameID].cbs.push(callback);
};

/**
 * Unsubscribe from the given TF frame.
 *
 * @param frameID - the TF frame to unsubscribe from
 * @param callback - the callback function to remove
 */
TFClient.prototype.unsubscribe = function(frameID, callback) {
  // remove leading slash, if it's there
  if (frameID[0] === '/')
  {
    frameID = frameID.substring(1);
  }
  var info = this.frameInfos[frameID];
  for (var cbs = info && info.cbs || [], idx = cbs.length; idx--;) {
    if (cbs[idx] === callback) {
      cbs.splice(idx, 1);
    }
  }
  if (!callback || cbs.length === 0) {
    delete this.frameInfos[frameID];
  }
};

TFClient.prototype.transformToMatrix = function(transform){
  
  var x = transform.rotation.x,
  y = transform.rotation.y,
  z = transform.rotation.z,
  w = transform.rotation.w;

  var Tx = transform.translation.x,
  Ty = transform.translation.y,
  Tz = transform.translation.z;
  
  x2 = x*x, y2 = y*y, z2 = z*z, w2 = w*w, zw = z*w,
  yz = y*z, xw = x*w, xz = x*z, yw = y*w, xy = x*y;

  var out = [
    [1-2*(y2+z2), 2*(xy-zw), 0, Tx],
    [2*(xy+zw), 1-2*(x2+z2), 0, Ty],
    [0,         0,           1, Tz],
    [0        , 0        , 0  , 1]
  ];
  return out;
};

TFClient.prototype.dotMatrix = function(M1, M2){
  var out = [
    [0, 0, 0, 0],
    [0, 0, 0, 0],
    [0, 0, 0, 0],
    [0, 0, 0, 0]
  ];
  for (var i=0; i < 4; i++){
    for (var j = 0; j < 4; j++){
      for( var k = 0; k < 4; k++){
        out[i][j] += M1[i][k]* M2[k][j];
      }
    }
  }

  return out;
};

TFClient.prototype.quatRotate = function(rotation, v, i){
  var rot = new Quaternion(rotation);
  var q = rot.multiplyVector(v);
  rot.inverse();
  q.multiplyAssign(rot);
  return new Vector3({
    x : q.x,
    y : q.y,
    z : q.z
  });
};

module.exports = TFClient;

},{"../math/Quaternion":18,"../math/Vector3":20,"../actionlib/ActionClient":4,"../actionlib/Goal":5,"../core/Service.js":11,"../core/ServiceRequest.js":12,"../math/Transform":19}],24:[function(require,module,exports){
var Ros = require('../core/Ros');
var mixin = require('../mixin');

var tf = module.exports = {
    TFClient: require('./TFClient')
};

mixin(Ros, ['TFClient'], tf);
},{"../core/Ros":10,"../mixin":22,"./TFClient":23}],25:[function(require,module,exports){
/**
 * @fileOverview 
 * @author Benjamin Pitzer - ben.pitzer@gmail.com
 * @author Russell Toris - rctoris@wpi.edu
 */

var Vector3 = require('../math/Vector3');
var UrdfTypes = require('./UrdfTypes');

/**
 * A Box element in a URDF.
 *
 * @constructor
 * @param options - object with following keys:
 *  * xml - the XML element to parse
 */
function UrdfBox(options) {
  this.dimension = null;
  this.type = UrdfTypes.URDF_BOX;

  // Parse the xml string
  var xyz = options.xml.getAttribute('size').split(' ');
  this.dimension = new Vector3({
    x : parseFloat(xyz[0]),
    y : parseFloat(xyz[1]),
    z : parseFloat(xyz[2])
  });
}

module.exports = UrdfBox;
},{"../math/Vector3":20,"./UrdfTypes":34}],26:[function(require,module,exports){
/**
 * @fileOverview 
 * @author Benjamin Pitzer - ben.pitzer@gmail.com
 * @author Russell Toris - rctoris@wpi.edu
 */

/**
 * A Color element in a URDF.
 *
 * @constructor
 * @param options - object with following keys:
 *  * xml - the XML element to parse
 */
function UrdfColor(options) {
  // Parse the xml string
  var rgba = options.xml.getAttribute('rgba').split(' ');
  this.r = parseFloat(rgba[0]);
  this.g = parseFloat(rgba[1]);
  this.b = parseFloat(rgba[2]);
  this.a = parseFloat(rgba[3]);
}

module.exports = UrdfColor;
},{}],27:[function(require,module,exports){
/**
 * @fileOverview 
 * @author Benjamin Pitzer - ben.pitzer@gmail.com
 * @author Russell Toris - rctoris@wpi.edu
 */

var UrdfTypes = require('./UrdfTypes');

/**
 * A Cylinder element in a URDF.
 *
 * @constructor
 * @param options - object with following keys:
 *  * xml - the XML element to parse
 */
function UrdfCylinder(options) {
  this.type = UrdfTypes.URDF_CYLINDER;
  this.length = parseFloat(options.xml.getAttribute('length'));
  this.radius = parseFloat(options.xml.getAttribute('radius'));
}

module.exports = UrdfCylinder;
},{"./UrdfTypes":34}],28:[function(require,module,exports){
/**
 * @fileOverview 
 * @author David V. Lu!!  davidvlu@gmail.com
 */

/**
 * A Joint element in a URDF.
 *
 * @constructor
 * @param options - object with following keys:
 *  * xml - the XML element to parse
 */
function UrdfJoint(options) {
  this.name = options.xml.getAttribute('name');
  this.type = options.xml.getAttribute('type');
  
  var limits = options.xml.getElementsByTagName('limit');
  if (limits.length > 0) {
    this.minval = parseFloat( limits[0].getAttribute('lower') );
    this.maxval = parseFloat( limits[0].getAttribute('upper') );
  }
}

module.exports = UrdfJoint;

},{}],29:[function(require,module,exports){
/**
 * @fileOverview 
 * @author Benjamin Pitzer - ben.pitzer@gmail.com
 * @author Russell Toris - rctoris@wpi.edu
 */

var UrdfVisual = require('./UrdfVisual');

/**
 * A Link element in a URDF.
 *
 * @constructor
 * @param options - object with following keys:
 *  * xml - the XML element to parse
 */
function UrdfLink(options) {
  this.name = options.xml.getAttribute('name');
  this.visuals = [];
  var visuals = options.xml.getElementsByTagName('visual');

  for( var i=0; i<visuals.length; i++ ) {
    this.visuals.push( new UrdfVisual({
      xml : visuals[i]
    }) );
  }
}

module.exports = UrdfLink;
},{"./UrdfVisual":35}],30:[function(require,module,exports){
/**
 * @fileOverview 
 * @author Benjamin Pitzer - ben.pitzer@gmail.com
 * @author Russell Toris - rctoris@wpi.edu
 */

var UrdfColor = require('./UrdfColor');

/**
 * A Material element in a URDF.
 *
 * @constructor
 * @param options - object with following keys:
 *  * xml - the XML element to parse
 */
function UrdfMaterial(options) {
  this.textureFilename = null;
  this.color = null;

  this.name = options.xml.getAttribute('name');

  // Texture
  var textures = options.xml.getElementsByTagName('texture');
  if (textures.length > 0) {
    this.textureFilename = textures[0].getAttribute('filename');
  }

  // Color
  var colors = options.xml.getElementsByTagName('color');
  if (colors.length > 0) {
    // Parse the RBGA string
    this.color = new UrdfColor({
      xml : colors[0]
    });
  }
}

UrdfMaterial.prototype.isLink = function() {
  return this.color === null && this.textureFilename === null;
};

var assign = require('object-assign');

UrdfMaterial.prototype.assign = function(obj) {
    return assign(this, obj);
};

module.exports = UrdfMaterial;

},{"./UrdfColor":26,"object-assign":1}],31:[function(require,module,exports){
/**
 * @fileOverview 
 * @author Benjamin Pitzer - ben.pitzer@gmail.com
 * @author Russell Toris - rctoris@wpi.edu
 */

var Vector3 = require('../math/Vector3');
var UrdfTypes = require('./UrdfTypes');

/**
 * A Mesh element in a URDF.
 *
 * @constructor
 * @param options - object with following keys:
 *  * xml - the XML element to parse
 */
function UrdfMesh(options) {
  this.scale = null;

  this.type = UrdfTypes.URDF_MESH;
  this.filename = options.xml.getAttribute('filename');

  // Check for a scale
  var scale = options.xml.getAttribute('scale');
  if (scale) {
    // Get the XYZ
    var xyz = scale.split(' ');
    this.scale = new Vector3({
      x : parseFloat(xyz[0]),
      y : parseFloat(xyz[1]),
      z : parseFloat(xyz[2])
    });
  }
}

module.exports = UrdfMesh;
},{"../math/Vector3":20,"./UrdfTypes":34}],32:[function(require,module,exports){
/**
 * @fileOverview 
 * @author Benjamin Pitzer - ben.pitzer@gmail.com
 * @author Russell Toris - rctoris@wpi.edu
 */

var UrdfMaterial = require('./UrdfMaterial');
var UrdfLink = require('./UrdfLink');
var UrdfJoint = require('./UrdfJoint');
var DOMParser = require('xmldom').DOMParser;

// See https://developer.mozilla.org/docs/XPathResult#Constants
var XPATH_FIRST_ORDERED_NODE_TYPE = 9;

/**
 * A URDF Model can be used to parse a given URDF into the appropriate elements.
 *
 * @constructor
 * @param options - object with following keys:
 *  * xml - the XML element to parse
 *  * string - the XML element to parse as a string
 */
function UrdfModel(options) {
  options = options || {};
  var xmlDoc = options.xml;
  var string = options.string;
  var frameRoot = options.frameRoot;
  this.materials = {};
  this.links = {};
  this.joints = {};
  this.parent_list = {};

  // Check if we are using a string or an XML element
  if (string) {
    // Parse the string
    var parser = new DOMParser();
    xmlDoc = parser.parseFromString(string, 'text/xml');
  }

  var child_node;

  // Initialize the model with the given XML node.
  // Get the robot tag
  var robotXml = xmlDoc.documentElement;

  // Get the robot name
  this.name = robotXml.getAttribute('name');

  // Parse all the visual elements we need
  for (var nodes = robotXml.childNodes, i = 0; i < nodes.length; i++) {
    var node = nodes[i];
    if (node.tagName === 'material') {
      var material = new UrdfMaterial({
        xml : node
      });
      // Make sure this is unique
      if (this.materials[material.name] !== void 0) {
        if( this.materials[material.name].isLink() ) {
          this.materials[material.name].assign( material );
        } else {
          console.warn('Material ' + material.name + 'is not unique.');
        }
      } else {
        this.materials[material.name] = material;
      }
    } else if (node.tagName === 'link') {
      var link = new UrdfLink({
        xml : node
      });
      // Make sure this is unique
      if (this.links[link.name] !== void 0) {
        console.warn('Link ' + link.name + ' is not unique.');
      } else {
        // Check for a material
        for( var j=0; j<link.visuals.length; j++ )
        {
          var mat = link.visuals[j].material; 
          if ( mat !== null ) {
            if (this.materials[mat.name] !== void 0) {
              link.visuals[j].material = this.materials[mat.name];
            } else {
              this.materials[mat.name] = mat;
            }
          }
        }

        // Add the link
        this.links[link.name] = link;
      }
    } else if (node.tagName === 'joint') {
      var joint = new UrdfJoint({
        xml : node
      });
      this.joints[joint.name] = joint;
      var joint_nodes = node.childNodes;
      var child, parent;
      this.parent_list[frameRoot] = 'root';
      for (index=0; index<joint_nodes.length; index++)
      {
        var n = joint_nodes[index];
        if ( n.tagName === 'parent'){
          parent = n.getAttribute('link');
        } 
        else 
          if (n.tagName === 'child'){
            child = n.getAttribute('link');
          }
        if(parent && child){
          this.parent_list[child] = parent;
          parent = '';
          child = '';
        }
      }
    }
  }
  /**/
}

module.exports = UrdfModel;

},{"./UrdfJoint":28,"./UrdfLink":29,"./UrdfMaterial":30,"xmldom":41}],33:[function(require,module,exports){
/**
 * @fileOverview 
 * @author Benjamin Pitzer - ben.pitzer@gmail.com
 * @author Russell Toris - rctoris@wpi.edu
 */

var UrdfTypes = require('./UrdfTypes');

/**
 * A Sphere element in a URDF.
 *
 * @constructor
 * @param options - object with following keys:
 *  * xml - the XML element to parse
 */
function UrdfSphere(options) {
  this.type = UrdfTypes.URDF_SPHERE;
  this.radius = parseFloat(options.xml.getAttribute('radius'));
}

module.exports = UrdfSphere;
},{"./UrdfTypes":34}],34:[function(require,module,exports){
module.exports = {
  URDF_SPHERE : 0,
  URDF_BOX : 1,
  URDF_CYLINDER : 2,
  URDF_MESH : 3
};

},{}],35:[function(require,module,exports){
/**
 * @fileOverview 
 * @author Benjamin Pitzer - ben.pitzer@gmail.com
 * @author Russell Toris - rctoris@wpi.edu
 */

var Pose = require('../math/Pose');
var Vector3 = require('../math/Vector3');
var Quaternion = require('../math/Quaternion');

var UrdfCylinder = require('./UrdfCylinder');
var UrdfBox = require('./UrdfBox');
var UrdfMaterial = require('./UrdfMaterial');
var UrdfMesh = require('./UrdfMesh');
var UrdfSphere = require('./UrdfSphere');

/**
 * A Visual element in a URDF.
 *
 * @constructor
 * @param options - object with following keys:
 *  * xml - the XML element to parse
 */
function UrdfVisual(options) {
  var xml = options.xml;
  this.origin = null;
  this.geometry = null;
  this.material = null;

  // Origin
  var origins = xml.getElementsByTagName('origin');
  if (origins.length === 0) {
    // use the identity as the default
    this.origin = new Pose();
  } else {
    // Check the XYZ
    var xyz = origins[0].getAttribute('xyz');
    var position = new Vector3();
    if (xyz) {
      xyz = xyz.split(' ');
      position = new Vector3({
        x : parseFloat(xyz[0]),
        y : parseFloat(xyz[1]),
        z : parseFloat(xyz[2])
      });
    }

    // Check the RPY
    var rpy = origins[0].getAttribute('rpy');
    var orientation = new Quaternion();
    if (rpy) {
      rpy = rpy.split(' ');
      // Convert from RPY
      var roll = parseFloat(rpy[0]);
      var pitch = parseFloat(rpy[1]);
      var yaw = parseFloat(rpy[2]);
      var phi = roll / 2.0;
      var the = pitch / 2.0;
      var psi = yaw / 2.0;
      var x = Math.sin(phi) * Math.cos(the) * Math.cos(psi) - Math.cos(phi) * Math.sin(the)
          * Math.sin(psi);
      var y = Math.cos(phi) * Math.sin(the) * Math.cos(psi) + Math.sin(phi) * Math.cos(the)
          * Math.sin(psi);
      var z = Math.cos(phi) * Math.cos(the) * Math.sin(psi) - Math.sin(phi) * Math.sin(the)
          * Math.cos(psi);
      var w = Math.cos(phi) * Math.cos(the) * Math.cos(psi) + Math.sin(phi) * Math.sin(the)
          * Math.sin(psi);

      orientation = new Quaternion({
        x : x,
        y : y,
        z : z,
        w : w
      });
      orientation.normalize();
    }
    this.origin = new Pose({
      position : position,
      orientation : orientation
    });
  }

  // Geometry
  var geoms = xml.getElementsByTagName('geometry');
  if (geoms.length > 0) {
    var geom = geoms[0];
    var shape = null;
    // Check for the shape
    for (var i = 0; i < geom.childNodes.length; i++) {
      var node = geom.childNodes[i];
      if (node.nodeType === 1) {
        shape = node;
        break;
      }
    }
    // Check the type
    var type = shape.nodeName;
    if (type === 'sphere') {
      this.geometry = new UrdfSphere({
        xml : shape
      });
    } else if (type === 'box') {
      this.geometry = new UrdfBox({
        xml : shape
      });
    } else if (type === 'cylinder') {
      this.geometry = new UrdfCylinder({
        xml : shape
      });
    } else if (type === 'mesh') {
      this.geometry = new UrdfMesh({
        xml : shape
      });
    } else {
      console.warn('Unknown geometry type ' + type);
    }
  }

  // Material
  var materials = xml.getElementsByTagName('material');
  if (materials.length > 0) {
    this.material = new UrdfMaterial({
      xml : materials[0]
    });
  }
}

module.exports = UrdfVisual;
},{"../math/Pose":17,"../math/Quaternion":18,"../math/Vector3":20,"./UrdfBox":25,"./UrdfCylinder":27,"./UrdfMaterial":30,"./UrdfMesh":31,"./UrdfSphere":33}],36:[function(require,module,exports){
module.exports = require('object-assign')({
    UrdfBox: require('./UrdfBox'),
    UrdfColor: require('./UrdfColor'),
    UrdfCylinder: require('./UrdfCylinder'),
    UrdfLink: require('./UrdfLink'),
    UrdfMaterial: require('./UrdfMaterial'),
    UrdfMesh: require('./UrdfMesh'),
    UrdfModel: require('./UrdfModel'),
    UrdfSphere: require('./UrdfSphere'),
    UrdfVisual: require('./UrdfVisual')
}, require('./UrdfTypes'));

},{"./UrdfBox":25,"./UrdfColor":26,"./UrdfCylinder":27,"./UrdfLink":29,"./UrdfMaterial":30,"./UrdfMesh":31,"./UrdfModel":32,"./UrdfSphere":33,"./UrdfTypes":34,"./UrdfVisual":35,"object-assign":1}],37:[function(require,module,exports){
(function (global){
module.exports = {
  EventEmitter2: global.EventEmitter2
};
}).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
},{}],38:[function(require,module,exports){
(function (global){
module.exports = global.WebSocket;
}).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
},{}],39:[function(require,module,exports){
/* global document */
module.exports = function Canvas() {
  return document.createElement('canvas');
};
},{}],40:[function(require,module,exports){
(function (global){
/**
 * @fileOverview
 * @author Graeme Yeates - github.com/megawac
 */

'use strict';

var Canvas = require('canvas');
var Image = Canvas.Image || global.Image;

/**
 * If a message was compressed as a PNG image (a compression hack since
 * gzipping over WebSockets * is not supported yet), this function places the
 * "image" in a canvas element then decodes the * "image" as a Base64 string.
 *
 * @private
 * @param data - object containing the PNG data.
 * @param callback - function with params:
 *   * data - the uncompressed data
 */
function decompressPng(data, callback) {
  // Uncompresses the data before sending it through (use image/canvas to do so).
  var image = new Image();
  // When the image loads, extracts the raw data (JSON message).
  image.onload = function() {
    // Creates a local canvas to draw on.
    var canvas = new Canvas();
    var context = canvas.getContext('2d');

    // Sets width and height.
    canvas.width = image.width;
    canvas.height = image.height;

    // Prevents anti-aliasing and loosing data
    context.imageSmoothingEnabled = false;
    context.webkitImageSmoothingEnabled = false;
    context.mozImageSmoothingEnabled = false;

    // Puts the data into the image.
    context.drawImage(image, 0, 0);
    // Grabs the raw, uncompressed data.
    var imageData = context.getImageData(0, 0, image.width, image.height).data;

    // Constructs the JSON.
    var jsonData = '';
    for (var i = 0; i < imageData.length; i += 4) {
      // RGB
      jsonData += String.fromCharCode(imageData[i], imageData[i + 1], imageData[i + 2]);
    }
    callback(JSON.parse(jsonData));
  };
  // Sends the image data to load.
  image.src = 'data:image/png;base64,' + data;
}

module.exports = decompressPng;
}).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
},{"canvas":39}],41:[function(require,module,exports){
(function (global){
exports.DOMImplementation = global.DOMImplementation;
exports.XMLSerializer = global.XMLSerializer;
exports.DOMParser = global.DOMParser;
}).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
},{}]},{},[3]);