EmissionVision-Group2/Assets/WorldPoliticalMapGlobeEdition/Scripts/WorldMapGlobeCities.cs

// World Political Map - Globe Edition for Unity - Main Script
// Created by Ramiro Oliva (Kronnect)
// Don't modify this script - changes could be lost if you upgrade to a more recent version of WPM
// ***************************************************************************
// This is the public API file - every property or public method belongs here
// ***************************************************************************

using UnityEngine;
using System;
using System.IO;
using System.Collections;
using System.Collections.Generic;
using System.Text;

namespace WPM {

    public delegate void CityEvent(int cityIndex);

    /* Public WPM Class */
    public partial class WorldMapGlobe : MonoBehaviour {

        public event CityEvent OnCityEnter;
        public event CityEvent OnCityExit;
        public event CityEvent OnCityPointerDown;
        public event CityEvent OnCityPointerUp;
        public event CityEvent OnCityClick;

        public const int CITY_CLASS_FILTER_REGION_CAPITAL_CITY = 2;
        public const int CITY_CLASS_FILTER_COUNTRY_CAPITAL_CITY = 4;

        /// <summary>
        /// Complete list of cities with their names and country names.
        /// </summary>
        public List<City> cities {
            get {
                if (_cities == null)
                    ReadCitiesPackedString();
                return _cities;
            }
            set {
                _cities = value;
                lastCityLookupCount = -1;
            }
        }


        City _cityHighlighted;

        /// <summary>
        /// Returns City under mouse position or null if none.
        /// </summary>
        public City cityHighlighted { get { return _cityHighlighted; } }

        int _cityHighlightedIndex = -1;

        /// <summary>
        /// Returns City index mouse position or null if none.
        /// </summary>
        public int cityHighlightedIndex { get { return _cityHighlightedIndex; } }

        int _cityLastClicked = -1;

        /// <summary>
        /// Returns the last clicked city index.
        /// </summary>
        public int cityLastClicked { get { return _cityLastClicked; } }



        [SerializeField]
        bool
            _showCities = true;

        /// <summary>
        /// Toggle cities visibility.
        /// </summary>
        public bool showCities {
            get {
                return _showCities;
            }
            set {
                if (_showCities != value) {
                    _showCities = value;
                    isDirty = true;
                    if (citiesLayer != null) {
                        citiesLayer.SetActive(_showCities);
                    } else if (_showCities) {
                        DrawCities();
                    }
                }
            }
        }

        [NonSerialized]
        int
            _numCitiesDrawn = 0;

        /// <summary>
        /// Gets the number cities drawn.
        /// </summary>
        public int numCitiesDrawn { get { return _numCitiesDrawn; } }




        [SerializeField]
        Color
            _citiesColor = Color.white;

        /// <summary>
        /// Global color for cities.
        /// </summary>
        public Color citiesColor {
            get {
                if (citiesNormalMat != null) {
                    return citiesNormalMat.color;
                } else {
                    return _citiesColor;
                }
            }
            set {
                if (value != _citiesColor) {
                    _citiesColor = value;
                    isDirty = true;

                    if (citiesNormalMat != null && _citiesColor != citiesNormalMat.color) {
                        citiesNormalMat.color = _citiesColor;
                    }
                }
            }
        }

        [SerializeField]
        Color
            _citiesRegionCapitalColor = Color.cyan;

        /// <summary>
        /// Global color for region capitals.
        /// </summary>
        public Color citiesRegionCapitalColor {
            get {
                if (citiesRegionCapitalMat != null) {
                    return citiesRegionCapitalMat.color;
                } else {
                    return _citiesRegionCapitalColor;
                }
            }
            set {
                if (value != _citiesRegionCapitalColor) {
                    _citiesRegionCapitalColor = value;
                    isDirty = true;

                    if (citiesRegionCapitalMat != null && _citiesRegionCapitalColor != citiesRegionCapitalMat.color) {
                        citiesRegionCapitalMat.color = _citiesRegionCapitalColor;
                    }
                }
            }
        }


        [SerializeField]
        Color
            _citiesCountryCapitalColor = Color.yellow;

        /// <summary>
        /// Global color for country capitals.
        /// </summary>
        public Color citiesCountryCapitalColor {
            get {
                if (citiesCountryCapitalMat != null) {
                    return citiesCountryCapitalMat.color;
                } else {
                    return _citiesCountryCapitalColor;
                }
            }
            set {
                if (value != _citiesCountryCapitalColor) {
                    _citiesCountryCapitalColor = value;
                    isDirty = true;

                    if (citiesCountryCapitalMat != null && _citiesCountryCapitalColor != citiesCountryCapitalMat.color) {
                        citiesCountryCapitalMat.color = _citiesCountryCapitalColor;
                    }
                }
            }
        }


        [SerializeField]
        float _cityIconSize = 0.2f;

        /// <summary>
        /// The size of the cities icon (dot).
        /// </summary>
        public float cityIconSize {
            get {
                return _cityIconSize;
            }
            set {
                if (value != _cityIconSize) {
                    _cityIconSize = value;
                    isDirty = true;
                    ScaleCities();
                    ScaleMountPoints();
                }
            }
        }


        [Range(0, 17000)]
        [SerializeField]
        int
            _minPopulation = 1500;

        public int minPopulation {
            get {
                return _minPopulation;
            }
            set {
                if (value != _minPopulation) {
                    _minPopulation = value;
                    isDirty = true;
                    DrawCities();
                }
            }
        }


        [SerializeField]
        int _cityClassAlwaysShow;

        /// <summary>
        /// Flags for specifying the class of cities to always show irrespective of other filters like minimum population. Can assign a combination of bit flags defined by CITY_CLASS_FILTER* constants.
        /// </summary>
        public int cityClassAlwaysShow {
            get { return _cityClassAlwaysShow; }
            set {
                if (_cityClassAlwaysShow != value) {
                    _cityClassAlwaysShow = value;
                    isDirty = true;
                    DrawCities();
                }
            }
        }




        [SerializeField]
        bool
            _combineCityMeshes = true;

        /// <summary>
        /// Optimize cities meshes.
        /// </summary>
        public bool combineCityMeshes {
            get {
                return _combineCityMeshes;
            }
            set {
                if (_combineCityMeshes != value) {
                    _combineCityMeshes = value;
                    isDirty = true;
                    DrawCities();
                }
            }
        }



        string _cityAttributeFile = CITY_ATTRIB_DEFAULT_FILENAME;

        public string cityAttributeFile {
            get { return _cityAttributeFile; }
            set {
                if (value != _cityAttributeFile) {
                    _cityAttributeFile = value;
                    if (_cityAttributeFile == null)
                        _cityAttributeFile = CITY_ATTRIB_DEFAULT_FILENAME;
                    isDirty = true;
                    ReloadCitiesAttributes();
                }
            }
        }


        #region Public API area

        /// <summary>
        /// Starts navigation to target city. Returns false if not found.
        /// </summary>
        public CallbackHandler FlyToCity(string cityName) {
            int cityIndex = GetCityIndex(cityName);
            return FlyToCity(cityIndex);
        }

        /// <summary>
        /// Starts navigation to target city. Returns false if not found.
        /// </summary>
        public CallbackHandler FlyToCity(string countryName, string cityName) {
            int cityIndex = GetCityIndexInCountry(countryName, cityName);
            return FlyToCity(cityIndex);
        }

        /// <summary>
        /// Starts navigation to target city by index in the cities collection. Returns false if not found.
        /// </summary>
        public CallbackHandler FlyToCity(int cityIndex) {
            if (cityIndex < 0 || cityIndex >= cities.Count)
                return CallbackHandler.Null;
            return FlyToCity(cities[cityIndex]);
        }


        /// <summary>
        /// Starts navigation to target city by index in the cities collection and duration. Returns false if not found.
        /// </summary>
        public CallbackHandler FlyToCity(int cityIndex, float duration) {
            if (cityIndex < 0 || cityIndex >= cities.Count)
                return CallbackHandler.Null;
            return FlyToLocation(cities[cityIndex].localPosition, duration, 0, _navigationBounceIntensity);
        }


        /// <summary>
        /// Starts navigation to target city. Returns false if not found.
        /// </summary>
        public CallbackHandler FlyToCity(City city) {
            return FlyToCity(city, _navigationTime);
        }

        /// <summary>
        /// Starts navigation to target city with duration (seconds). Returns false if not found.
        /// </summary>
        public CallbackHandler FlyToCity(City city, float duration) {
            return FlyToLocation(city.localPosition, duration, 0, _navigationBounceIntensity);
        }


        /// <summary>
        /// Starts navigating to target city by index in the cities collection with specified duration, ignoring NavigationTime property.
        /// Set duration to zero to go instantly.
        /// Set zoomLevel to a value from 0 to 1 for the destination zoom level. A value of 0 will keep current zoom level.
        /// </summary>
        public CallbackHandler FlyToCity(int cityIndex, float duration, float zoomLevel) {
            if (cityIndex < 0 || cityIndex >= cities.Count)
                return CallbackHandler.Null;
            return FlyToLocation(_cities[cityIndex].localPosition, duration, zoomLevel, _navigationBounceIntensity);
        }

        /// <summary>
        /// Starts navigating to target city by index in the cities collection with specified duration, ignoring NavigationTime property.
        /// </summary>
        /// <param name="cityIndex">City index.</param>
        /// <param name="duration">Set duration to zero to go instantly.</param>
        /// <param name="zoomLevel">Set zoomLevel to a value from 0 to 1 for the destination zoom level.</param>
        /// <param name="bounceIntensity">Set bounceIntensity to a value from 0 to 1 for a bouncing effect between current position and destination.</param>
        public CallbackHandler FlyToCity(int cityIndex, float duration, float zoomLevel, float bounceIntensity) {
            if (cityIndex < 0 || cityIndex >= cities.Count)
                return CallbackHandler.Null;
            return FlyToLocation(_cities[cityIndex].localPosition, duration, zoomLevel, bounceIntensity);
        }


        /// <summary>
        /// Returns an array with the city names.
        /// </summary>
        public string[] GetCityNames() {
            return GetCityNames(true);
        }

        /// <summary>
        /// Returns an array with the city names.
        /// </summary>
        public string[] GetCityNames(bool includeCityIndex) {
            List<string> c = new List<string>(cities.Count);
            for (int k = 0; k < cities.Count; k++) {
                if (includeCityIndex) {
                    c.Add(cities[k].name + " (" + k + ")");
                } else {
                    c.Add(cities[k].name);
                }
            }
            c.Sort();
            return c.ToArray();
        }

        /// <summary>
        /// Returns an array with the city names.
        /// </summary>
        public string[] GetCityNames(int countryIndex, bool includeCityIndex) {
            List<string> c = new List<string>(cities.Count);
            for (int k = 0; k < cities.Count; k++) {
                if (cities[k].countryIndex == countryIndex) {
                    if (includeCityIndex) {
                        c.Add(cities[k].name + " (" + k + ")");
                    } else {
                        c.Add(cities[k].name);
                    }
                }
            }
            c.Sort();
            return c.ToArray();
        }

        /// <summary>
        /// Given a country name and a city name, returns the City object
        /// </summary>
        /// <returns>The city.</returns>
        /// <param name="countryName">Country name.</param>
        /// <param name="cityName">City name.</param>
        public City GetCity(string countryName, string cityName) {
            int countryIndex = GetCountryIndex(countryName);
            return GetCity(countryIndex, cityName);
        }

        /// <summary>
        /// Given a country name, province name and a city name, returns the City object
        /// </summary>
        /// <returns>The city.</returns>
        /// <param name="countryName">Country name.</param>
        /// <param name="provinceName">Province name.</param>
        /// <param name="cityName">City name.</param>
        public City GetCity(string countryName, string provinceName, string cityName) {
            int cityIndex = GetCityIndex(countryName, provinceName, cityName);
            if (cityIndex < 0)
                return null;
            return cities[cityIndex];
        }

        /// <summary>
        /// Gets a city object by its index
        /// </summary>
        public City GetCity(int cityIndex) {
            if (cityIndex < 0 || cityIndex >= cities.Count) {
                return null;
            }
            return _cities[cityIndex];
        }


        /// <summary>
        /// Given a country index and a city name returns the City object
        /// </summary>
        /// <returns>The city.</returns>
        /// <param name="countryIndex">Country index.</param>
        /// <param name="cityName">City name.</param>
        public City GetCity(int countryIndex, string cityName) {
            int cityIndex = GetCityIndexInCountry(countryIndex, cityName);
            if (cityIndex < 0 || cityIndex >= cities.Count) {
                return null;
            }
            return _cities[cityIndex];
        }

        /// <summary>
        /// Returns the index of a random visible city.
        /// </summary>
        public int GetCityIndex() {
            if (cities == null)
                return -1;
            int z = UnityEngine.Random.Range(0, cities.Count);
            int cityCount = cities.Count;
            for (int k = z; k < cityCount; k++) {
                if (cities[k].isShown)
                    return k;
            }
            for (int k = 0; k < z; k++) {
                if (cities[k].isShown)
                    return k;
            }
            return -1;
        }


        /// <summary>
        /// Returns the index of the city by its name in the cities collection.
        /// </summary>
        public int GetCityIndex(string cityName) {
            int cityCount = cities.Count;
            for (int k = 0; k < cityCount; k++) {
                if (cityName.Equals(cities[k].name)) {
                    return k;
                }
            }
            return -1;
        }

        /// <summary>
        /// Returns the index of the city by its name in the cities collection of a given country and province.
        /// </summary>
        public int GetCityIndex(string countryName, string provinceName, string cityName) {
            int countryIndex = GetCountryIndex(countryName);
            return GetCityIndex(countryIndex, provinceName, cityName);
        }

        /// <summary>
        /// Returns the index of the city by its name in the cities collection of a given country and province.
        /// </summary>
        public int GetCityIndex(int countryIndex, string provinceName, string cityName) {
            if (countryIndex < 0 || countryIndex >= countries.Length)
                return -1;
            int provinceIndex = GetProvinceIndex(countryIndex, provinceName);
            if (provinceIndex < 0)
                return -1;
            return GetCityIndexInProvince(provinceIndex, cityName);
        }

        /// <summary>
        /// Returns the index of the city by its name in the cities collection of a given province.
        /// </summary>
        public int GetCityIndexInProvince(int provinceIndex, string cityName) {
            if (provinceIndex < 0 || provinceIndex >= provinces.Length)
                return -1;
            string provinceName = _provinces[provinceIndex].name;
            int countryIndex = _provinces[provinceIndex].countryIndex;
            int cityCount = cities.Count;
            for (int k = 0; k < cityCount; k++) {
                City city = _cities[k];
                if (city.countryIndex == countryIndex && city.province.Equals(provinceName) && cityName.Equals(cities[k].name)) {
                    return k;
                }
            }
            return -1;
        }


        /// <summary>
        /// Returns the index of the city by its name in the cities collection of a given province.
        /// </summary>
        public int GetCityIndexInProvince(string provinceName, string cityName) {
            int cityCount = cities.Count;
            for (int k = 0; k < cityCount; k++) {
                City city = _cities[k];
                if (city.province.Equals(provinceName) && cityName.Equals(cities[k].name)) {
                    return k;
                }
            }
            return -1;
        }


        /// <summary>
        /// Returns the index of the city by its name in the cities collection of a given country.
        /// </summary>
        public int GetCityIndexInCountry(int countryIndex, string cityName) {
            if (countryIndex < 0 || countryIndex >= countries.Length)
                return -1;
            int cityCount = cities.Count;
            for (int k = 0; k < cityCount; k++) {
                City city = _cities[k];
                if (city.countryIndex == countryIndex && cityName.Equals(cities[k].name)) {
                    return k;
                }
            }
            return -1;
        }


        /// <summary>
        /// Returns the index of a city in the cities collection by its reference.
        /// </summary>
        public int GetCityIndex(City city) {
            return GetCityIndex(city, true);
        }

        /// <summary>
        /// Returns the index of a city in the cities collection by its reference.
        /// </summary>
        public int GetCityIndex(City city, bool includeNotVisible) {
            if (includeNotVisible)
                return cities.IndexOf(city);
            int cityIndex;
            if (cityLookup.TryGetValue(city, out cityIndex))
                return cityIndex;
            else
                return -1;
        }

        /// <summary>
        /// Returns the index of a city in the global countries collection. Note that country name needs to be supplied due to repeated city names.
        /// </summary>
        public int GetCityIndexInCountry(string countryName, string cityName) {
            int countryIndex = GetCountryIndex(countryName);
            if (countryIndex < 0 || countryIndex >= countries.Length)
                return -1;
            int cityCount = cities.Count;
            for (int k = 0; k < cityCount; k++) {
                City city = _cities[k];
                if (city.countryIndex == countryIndex && cityName.Equals(cities[k].name)) {
                    return k;
                }
            }
            return -1;
        }

        /// <summary>
        /// Returns the city index by screen position.
        /// </summary>
        public bool GetCityIndex(Ray ray, out int cityIndex, int countryIndex = -1) {
            Vector3 hitPos;
            if (GetGlobeIntersection(ray, out hitPos)) {
                Vector3 localHit = transform.InverseTransformPoint(hitPos);
                int c = GetCityNearPoint(localHit, countryIndex);
                if (c >= 0) {
                    cityIndex = c;
                    return true;
                }
            }
            cityIndex = -1;
            return false;
        }


        /// <summary>
        /// Returns the index of the nearest city to a location (lat/lon).
        /// </summary>
        public int GetCityIndex(float lat, float lon) {
            Vector3 spherePosition = Conversion.GetSpherePointFromLatLon(lat, lon);
            return GetCityIndex(spherePosition);
        }

        /// <summary>
        /// Returns the nearest city to a point specified in sphere coordinates.
        /// </summary>
        /// <returns>The city near point.</returns>
        /// <param name="localPoint">Local point in sphere coordinates.</param>
        /// <param name="cityIndexToExclude">Optional city index which will be excluded. Useful for getting the nearest city to a given one.</param>
        public int GetCityIndex(Vector2 latlon, int cityIndexToExclude = -1) {
            if (visibleCities == null)
                return -1;

            int nearest = -1;
            float minDist = float.MaxValue;
            int cityCount = cities.Count;
            for (int c = 0; c < cityCount; c++) {
                if (c == cityIndexToExclude)
                    continue;
                City city = cities[c];
                if (!city.isShown)
                    continue;
                Vector2 cityLoc = city.latlon;
                float dist = FastVector.SqrDistance(ref cityLoc, ref latlon);
                if (dist < minDist) {
                    minDist = dist;
                    nearest = c;
                }
            }
            return nearest;
        }


        /// <summary>
        /// Returns the nearest city to a point specified in sphere coordinates.
        /// </summary>
        /// <returns>The city near point.</returns>
        /// <param name="localPoint">Local point in sphere coordinates.</param>
        /// <param name="excludeCitiesList">Optional list with city index which will be excluded. Useful for getting the nearest city to a given one.</param>
        public int GetCityIndex(Vector2 latlon, List<int> excludeCitiesList) {
            if (visibleCities == null)
                return -1;

            int nearest = -1;
            float minDist = float.MaxValue;
            int cityCount = cities.Count;
            for (int c = 0; c < cityCount; c++) {
                City city = cities[c];
                if (!city.isShown)
                    continue;
                float dist = FastVector.SqrDistanceByValue(city.latlon, latlon);
                if (dist < minDist) {
                    if (!excludeCitiesList.Contains(c)) {
                        minDist = dist;
                        nearest = c;
                    }
                }
            }
            return nearest;
        }


        /// <summary>
        /// Gets the name of the city country.
        /// </summary>
        public string GetCityCountryName(int cityIndex) {
            if (cityIndex < 0 || cityIndex >= cities.Count)
                return "";
            int countryIndex = _cities[cityIndex].countryIndex;
            Country country = GetCountry(countryIndex);
            if (country != null)
                return country.name;
            else
                return "";
        }

        /// <summary>
        /// Convenient method that returns the name of the city plus the province and country names
        /// </summary>
        /// <returns>The city full name.</returns>
        /// <param name="cityIndex">City index.</param>
        public string GetCityFullName(City city) {
            if (city == null)
                return null;
            sb.Length = 0;
            sb.Append(city.name);
            sb.Append(" (");
            if (!string.IsNullOrEmpty(city.province) && !city.province.Equals(city.name)) {
                sb.Append(city.province);
                sb.Append(", ");
            }
            sb.Append(countries[city.countryIndex].name);
            sb.Append(")");
            return sb.ToString();
        }



        /// <summary>
        /// Convenient method that returns the name of the city plus the province and country names
        /// </summary>
        /// <returns>The city full name.</returns>
        /// <param name="cityIndex">City index.</param>
        public string GetCityFullName(int cityIndex) {
            if (cityIndex < 0 || cityIndex >= cities.Count)
                return null;
            return GetCityFullName(cities[cityIndex]);
        }

        /// <summary>
        /// Gets the name of the city province.
        /// </summary>
        public string GetCityProvinceName(int cityIndex) {
            if (cityIndex < 0 || cityIndex >= cities.Count)
                return "";
            return _cities[cityIndex].province;
        }

        /// <summary>
        /// Gets a random city from a given country
        /// </summary>
        /// <returns>The city.</returns>
        /// <param name="country">Country object.</param>
        public City GetCityRandom(Country country, bool onlyVisible = false) {
            int cityCount = cities.Count;
            int countryIndex = GetCountryIndex(country);
            List<City> cc = new List<City>(100);
            for (int k = 0; k < cityCount; k++) {
                if ((!onlyVisible || _cities[k].isShown) && _cities[k].countryIndex == countryIndex) {
                    cc.Add(_cities[k]);
                }
            }
            int count = cc.Count;
            if (count == 0)
                return null;
            return cc[UnityEngine.Random.Range(0, count)];
        }


        /// <summary>
        /// Gets a random city from a given province
        /// </summary>
        /// <returns>The city.</returns>
        /// <param name="province">Province object.</param>
        public City GetCityRandom(Province province, bool onlyVisible = false) {
            int cityCount = cities.Count;
            int countryIndex = province.countryIndex;
            List<City> cc = new List<City>(100);
            for (int k = 0; k < cityCount; k++) {
                if ((!onlyVisible || _cities[k].isShown) && _cities[k].countryIndex == countryIndex && _cities[k].province.Equals(province.name)) {
                    cc.Add(_cities[k]);
                }
            }
            int count = cc.Count;
            if (count == 0)
                return null;
            return cc[UnityEngine.Random.Range(0, count)];
        }


        /// <summary>
        /// Gets a random visible city
        /// </summary>
        /// <returns>The city.</returns>
        public City GetCityRandom(bool onlyVisible = true) {
            if (onlyVisible) {
                int count = visibleCities.Length;
                if (count == 0)
                    return null;
                return visibleCities[UnityEngine.Random.Range(0, count)];
            } else {
                int count = cities.Count;
                if (count == 0)
                    return null;
                return _cities[UnityEngine.Random.Range(0, count)];
            }
        }

        /// <summary>
        /// Gets a random city index from a given country
        /// </summary>
        /// <returns>The city random.</returns>
        /// <param name="country">Country object.</param>
        public int GetCityIndexRandom(Country country, bool onlyVisible = true) {
            City city = GetCityRandom(country, onlyVisible);
            if (city == null)
                return -1;
            return GetCityIndex(city);
        }


        /// <summary>
        /// Gets a random city index from a given province
        /// </summary>
        /// <returns>The city random.</returns>
        /// <param name="province">Province object.</param>
        public int GetCityIndexRandom(Province province, bool onlyVisible = true) {
            City city = GetCityRandom(province, onlyVisible);
            if (city == null)
                return -1;
            return GetCityIndex(city);
        }


        /// <summary>
        /// Gets the name of the country of the city.
        /// </summary>
        public string GetCityCountryName(City city) {
            Country country = GetCountry(city.countryIndex);
            if (country != null)
                return country.name;
            else
                return "";
        }

        /// <summary>
        /// Gets the name of the province of the city.
        /// </summary>
        public string GetCityProvinceName(City city) {
            return city.province;
        }


        /// <summary>
        /// Returns a list of cities whose attributes matches predicate
        /// </summary>
        public void GetCities(AttribPredicate predicate, List<City> results) {
            if (results == null) return;
            int cityCount = cities.Count;
            for (int k = 0; k < cityCount; k++) {
                City city = _cities[k];
                if (city.hasAttributes && predicate(city.attrib))
                    results.Add(city);
            }
        }


        /// <summary>
        /// Gets XML attributes of all cities in jSON format.
        /// </summary>
        public string GetCitiesAttributes(bool prettyPrint = true) {
            if (cities == null) return null;
            return GetCitiesAttributes(new List<City>(cities), prettyPrint);
        }

        /// <summary>
        /// Gets XML attributes of provided cities in jSON format.
        /// </summary>
        public string GetCitiesAttributes(List<City> cities, bool prettyPrint = true) {
            JSONObject composed = new JSONObject();
            int cityCount = cities.Count;
            for (int k = 0; k < cityCount; k++) {
                City city = _cities[k];
                if (city.hasAttributes && city.attrib.keys != null) {
                    composed.AddField(k.ToString(), city.attrib);
                }
            }
            return composed.Print(prettyPrint);
        }

        /// <summary>
        /// Sets cities attributes from a jSON formatted string.
        /// </summary>
        public void SetCitiesAttributes(string jSON) {
            JSONObject composed = new JSONObject(jSON);
            if (composed.keys == null)
                return;
            int keyCount = composed.keys.Count;
            for (int k = 0; k < keyCount; k++) {
                int cityIndex = int.Parse(composed.keys[k]);
                if (cityIndex >= 0) {
                    cities[cityIndex].attrib = composed[k];
                }
            }
        }



        /// <summary>
        /// Clears any city highlighted (color changed) and resets them to default city color
        /// </summary>
        public void HideCityHighlights() {
            if (citiesLayer == null)
                return;
            Renderer[] rr = citiesLayer.GetComponentsInChildren<Renderer>(true);
            for (int k = 0; k < rr.Length; k++) {
                string matName = rr[k].sharedMaterial.name;
                if (matName.Equals("Cities")) {
                    rr[k].sharedMaterial = citiesNormalMat;
                } else if (matName.Equals("CitiesCapitalRegion")) {
                    rr[k].sharedMaterial = citiesRegionCapitalMat;
                } else if (matName.Equals("CitiesCapitalCountry")) {
                    rr[k].sharedMaterial = citiesCountryCapitalMat;
                }
            }
        }

        /// <summary>
        /// Toggles the city highlight.
        /// </summary>
        /// <param name="cityIndex">City index.</param>
        /// <param name="color">Color.</param>
        /// <param name="highlighted">If set to <c>true</c> the color of the city will be changed. If set to <c>false</c> the color of the city will be reseted to default color</param>
        public void ToggleCityHighlight(int cityIndex, Color color, bool highlighted) {
            if (citiesLayer == null)
                return;
            GameObject cityObj = cities[cityIndex].gameObject;
            if (cityObj == null)
                return;
            Renderer rr = cityObj.GetComponent<Renderer>();
            if (rr == null)
                return;
            Material mat;
            if (highlighted) {
                mat = Instantiate(rr.sharedMaterial);
                mat.name = rr.sharedMaterial.name;
                mat.color = color;
                rr.sharedMaterial = mat;
            } else {
                switch (cities[cityIndex].cityClass) {
                    case CITY_CLASS.COUNTRY_CAPITAL:
                        mat = citiesCountryCapitalMat;
                        break;
                    case CITY_CLASS.REGION_CAPITAL:
                        mat = citiesRegionCapitalMat;
                        break;
                    default:
                        mat = citiesNormalMat;
                        break;
                }
                rr.sharedMaterial = mat;
            }
        }

        /// <summary>
        /// Flashes specified city by index in the global city collection.
        /// </summary>
        public void BlinkCity(int cityIndex, Color color1, Color color2, float duration, float blinkingSpeed) {
            if (citiesLayer == null)
                return;
            //			string cobj = GetCityHierarchyName(cityIndex);
            //			Transform t = transform.Find (cobj);
            GameObject cityObj = cities[cityIndex].gameObject;
            if (cityObj == null)
                return;
            CityBlinker sb = cityObj.AddComponent<CityBlinker>();
            sb.blinkMaterial = cityObj.GetComponent<Renderer>().sharedMaterial;
            sb.color1 = color1;
            sb.color2 = color2;
            sb.duration = duration;
            sb.speed = blinkingSpeed;
        }

        /// <summary>
        /// Deletes all cities of current selected country's continent
        /// </summary>
        public void CitiesDeleteFromContinent(string continentName) {
            HideCityHighlights();
            int k = -1;
            while (++k < cities.Count) {
                int cindex = cities[k].countryIndex;
                if (cindex >= 0) {
                    string cityContinent = countries[cindex].continent;
                    if (cityContinent.Equals(continentName)) {
                        cities.RemoveAt(k);
                        k--;
                    }
                }
            }
        }


        /// <summary>
        /// Returns a list of provinces that are visible (front facing camera)
        /// </summary>
        public List<City> GetVisibleCities() {
            List<City> vc = new List<City>(30);
            if (cities == null)
                return null;
            Camera cam = mainCamera;
            float viewportMinX = cam.rect.xMin;
            float viewportMaxX = cam.rect.xMax;
            float viewportMinY = cam.rect.yMin;
            float viewportMaxY = cam.rect.yMax;

            for (int k = 0; k < visibleCities.Length; k++) {
                City city = visibleCities[k];

                // Check if city is facing camera
                Vector3 center = transform.TransformPoint(city.localPosition);
                Vector3 dir = center - transform.position;
                float d = Vector3.Dot(cam.transform.forward, dir);
                if (d < -0.2f) {
                    // Check if city is inside viewport
                    Vector3 vpos = cam.WorldToViewportPoint(center);
                    if (vpos.x >= viewportMinX && vpos.x <= viewportMaxX && vpos.y >= viewportMinY && vpos.y <= viewportMaxY) {
                        vc.Add(city);
                    }
                }
            }
            return vc;
        }


        /// <summary>
        /// Returns a list of cities that are visible and located inside the rectangle defined by two given sphere points
        /// </summary>
        public List<City> GetVisibleCities(Vector3 rectTopLeft, Vector3 rectBottomRight) {
            Vector2 latlon0, latlon1;
            latlon0 = Conversion.GetBillboardPosFromSpherePoint(rectTopLeft);
            latlon1 = Conversion.GetBillboardPosFromSpherePoint(rectBottomRight);
            Rect rect = new Rect(latlon0.x, latlon1.y, latlon1.x - latlon0.x, latlon0.y - latlon1.y);
            List<City> selectedCities = new List<City>();

            int cityCount = visibleCities.Length;
            for (int k = 0; k < cityCount; k++) {
                City city = visibleCities[k];
                Vector2 bpos = Conversion.GetBillboardPosFromSpherePoint(city.localPosition);
                if (rect.Contains(bpos)) {
                    selectedCities.Add(city);
                }
            }
            return selectedCities;
        }

        #endregion


    }

}