MapForums

    public partial class FindStreetsInArea : Form
    {
        private Timer timer;
        private const double ALTITUDE = .5;
        private const int INCREMENT_METER = 75; // we do a check every 75 meter
        private double startLat, startLon;
        private double currentLat, currentLon;
        private double lonInc;
        private const double latInc = (double)INCREMENT_METER / 1000 / 1.852 / 60;
        private int x, y, maxX, maxY;
        private StringBuilder street = new StringBuilder();

        public FindStreetsInArea(GeoMapRegion mapRegion, double centerLat, double centerLon, double width, double height)
        {
            InitializeComponent();

            MP.NewMap(mapRegion);

            timer = new Timer();
            timer.Tick += timer_Tick;
            timer.Interval = 1;
            timer.Enabled = true;

            double nauticalMilesHeight = height / 1.852;    // heigth and width are in km
            double nauticalMilesWidth = width / 1.852;      // so we convert to nautical miles
            startLat = centerLat + nauticalMilesHeight / 2 / 60;
            startLon = centerLon - nauticalMilesWidth / 2 / 60 / Math.Cos(centerLat);
            maxX = (int)(width * 1000 / INCREMENT_METER);
            if (maxX == 0)
                maxX++;
            maxY = (int)(height * 1000 / INCREMENT_METER);
            if (maxY == 0)
                maxY++;
            lonInc = INCREMENT_METER / Math.Cos(centerLat) / 1000 / 1.852 / 60;
            currentLat = startLat;
            progressBar.Maximum = maxX * maxY;
            x = 0;
            y = 0;

        }

        void timer_Tick(object sender, EventArgs e)
        {
            timer.Enabled = false;
            try {
                if (x == 0)
                    currentLon = startLon;
                currentLon += lonInc;
                findStreets();
                triggerPosition();
                progressBar.Increment(1);
                x++;
                if (x == maxX) {
                    x = 0;
                    y++;
                    if (y > maxY) {
                        // We are done
                        timer.Dispose();
                        progressBar.ForeColor = Color.Lime;
                        return;
                    }
                    currentLat -= latInc;
                }
                timer.Enabled = true;
            } catch {   // Application could have been terminated
            }
        }

        /// <summary>
        /// Remove leading and trailing numbers
        /// Filters out duplicate streets
        /// Filters out streetnames length <= 3 characters, eg: N, E, A, Tel, Fax
        /// </summary>
        public void findStreets()
        {
            Map map = MP.ActiveMap;
            map.Altitude = ALTITUDE;
            Location loc = map.GetLocation(currentLat, currentLon, ALTITUDE);
            loc.GoTo();
            FindResults streetResults = map.ObjectsFromPoint(map.LocationToX(loc), map.LocationToY(loc));
            foreach (object o in streetResults) {
                Location StreetLoc = o as Location;
                if (StreetLoc != null && StreetLoc.StreetAddress != null) {
                    street.Length = 0;
                    int n = 0;
                    while (n < StreetLoc.StreetAddress.Street.Length) {
                        if (StreetLoc.StreetAddress.Street[n] >= 'A')
                            break;
                        n++;
                    }
                    while (n < StreetLoc.StreetAddress.Street.Length) {
                        if (StreetLoc.StreetAddress.Street[n] >= '0' && StreetLoc.StreetAddress.Street[n] <= '9')
                            break;
                        street.Append(StreetLoc.StreetAddress.Street[n++]);
                    }
                    string streetTrimmed = street.ToString().TrimEnd(new char[] { ' ', ',', '.', ':' });
                    if (streetTrimmed.Length > 3 && listBox.FindString(streetTrimmed) < 0)
                        listBox.Items.Add(streetTrimmed);
                }
            }
        }