/// <summary>
/// see https://en.wikipedia.org/wiki/Great-circle_navigation
/// </summary>
public static LocationCollection CalculateGreatCircleLocations(this Location location1, Location location2, double resolution = 1d)
{
if (resolution <= 0d)
{
throw new ArgumentOutOfRangeException("The parameter resolution must be greater than zero.");
}
if (location1.Longitude == location2.Longitude ||
location1.Latitude <= -90d || location1.Latitude >= 90d ||
location2.Latitude <= -90d || location2.Latitude >= 90d)
{
return(CalculateMeridianLocations(location1, location2.Latitude));
}
var locations = new LocationCollection(new Location(location1.Latitude, location1.Longitude));
var lat1 = location1.Latitude * Math.PI / 180d;
var lon1 = location1.Longitude * Math.PI / 180d;
var lat2 = location2.Latitude * Math.PI / 180d;
var lon2 = location2.Longitude * Math.PI / 180d;
var cosLat1 = Math.Cos(lat1);
var sinLat1 = Math.Sin(lat1);
var cosLat2 = Math.Cos(lat2);
var sinLat2 = Math.Sin(lat2);
var cosLon12 = Math.Cos(lon2 - lon1);
var sinLon12 = Math.Sin(lon2 - lon1);
var cosS12 = sinLat1 * sinLat2 + cosLat1 * cosLat2 * cosLon12;
var s12 = Math.Acos(Math.Min(Math.Max(cosS12, -1d), 1d));
var n = (int)Math.Ceiling(s12 / resolution * 180d / Math.PI);
if (n > 1)
{
var az1 = Math.Atan2(sinLon12, cosLat1 * sinLat2 / cosLat2 - sinLat1 * cosLon12);
var cosAz1 = Math.Cos(az1);
var sinAz1 = Math.Sin(az1);
var az0 = Math.Atan2(sinAz1 * cosLat1, Math.Sqrt(cosAz1 * cosAz1 + sinAz1 * sinAz1 * sinLat1 * sinLat1));
var sinAz0 = Math.Sin(az0);
var cosAz0 = Math.Cos(az0);
var s01 = Math.Atan2(sinLat1, cosLat1 * cosAz1);
var lon0 = lon1 - Math.Atan2(sinAz0 * Math.Sin(s01), Math.Cos(s01));
for (int i = 1; i < n; i++)
{
double s = s01 + i * s12 / n;
double sinS = Math.Sin(s);
double cosS = Math.Cos(s);
double lat = Math.Atan2(cosAz0 * sinS, Math.Sqrt(cosS * cosS + sinAz0 * sinAz0 * sinS * sinS));
double lon = Math.Atan2(sinAz0 * sinS, cosS) + lon0;
locations.Add(lat * 180d / Math.PI, lon * 180d / Math.PI);
}
}
locations.Add(location2.Latitude, location2.Longitude);
return(locations);
}
/// <summary>
/// Calculates a series of Locations on a great circle, or orthodrome, that connects the two specified Locations,
/// with an optional angular resolution specified in degrees.
///
/// See https://en.wikipedia.org/wiki/Great-circle_navigation
/// </summary>
public static LocationCollection OrthodromeLocations(Location location1, Location location2, double resolution = 1d)
{
if (resolution <= 0d)
{
throw new ArgumentOutOfRangeException(
nameof(resolution), "The resolution argument must be greater than zero.");
}
var lat1 = location1.Latitude * Math.PI / 180d;
var lon1 = location1.Longitude * Math.PI / 180d;
var lat2 = location2.Latitude * Math.PI / 180d;
var lon2 = location2.Longitude * Math.PI / 180d;
var cosLat1 = Math.Cos(lat1);
var sinLat1 = Math.Sin(lat1);
var cosLat2 = Math.Cos(lat2);
var sinLat2 = Math.Sin(lat2);
var cosLon12 = Math.Cos(lon2 - lon1);
var sinLon12 = Math.Sin(lon2 - lon1);
var a = cosLat1 * sinLat2 - sinLat1 * cosLat2 * cosLon12;
var b = cosLat2 * sinLon12;
var s12 = Math.Atan2(Math.Sqrt(a * a + b * b), sinLat1 * sinLat2 + cosLat1 * cosLat2 * cosLon12);
var n = (int)Math.Ceiling(s12 / resolution * 180d / Math.PI); // s12 in radians
var locations = new LocationCollection(new Location(location1.Latitude, location1.Longitude));
if (n > 1)
{
var az1 = Math.Atan2(sinLon12, cosLat1 * sinLat2 / cosLat2 - sinLat1 * cosLon12);
var cosAz1 = Math.Cos(az1);
var sinAz1 = Math.Sin(az1);
var az0 = Math.Atan2(sinAz1 * cosLat1, Math.Sqrt(cosAz1 * cosAz1 + sinAz1 * sinAz1 * sinLat1 * sinLat1));
var sinAz0 = Math.Sin(az0);
var cosAz0 = Math.Cos(az0);
var s01 = Math.Atan2(sinLat1, cosLat1 * cosAz1);
var lon0 = lon1 - Math.Atan2(sinAz0 * Math.Sin(s01), Math.Cos(s01));
for (var i = 1; i < n; i++)
{
var s = s01 + i * s12 / n;
var sinS = Math.Sin(s);
var cosS = Math.Cos(s);
var lat = Math.Atan2(cosAz0 * sinS, Math.Sqrt(cosS * cosS + sinAz0 * sinAz0 * sinS * sinS));
var lon = Math.Atan2(sinAz0 * sinS, cosS) + lon0;
locations.Add(lat * 180d / Math.PI, lon * 180d / Math.PI);
}
}
locations.Add(location2.Latitude, location2.Longitude);
return(locations);
}
public static LocationCollection CalculateMeridianLocations(this Location location, double latitude2, double resolution = 1d)
{
if (resolution <= 0d)
{
throw new ArgumentOutOfRangeException("The parameter resolution must be greater than zero.");
}
var locations = new LocationCollection();
var s = latitude2 - location.Latitude;
var n = (int)Math.Ceiling(Math.Abs(s) / resolution);
for (int i = 0; i <= n; i++)
{
locations.Add(new Location(location.Latitude + i * s / n, location.Longitude));
}
return(locations);
}
public static void Add(this LocationCollection locations, double latitude, double longitude)
{
if (locations.Count > 0)
{
var deltaLon = longitude - locations.Last().Longitude;
if (deltaLon < -180d)
{
longitude += 360d;
}
else if (deltaLon > 180)
{
longitude -= 360;
}
}
locations.Add(new Location(latitude, longitude));
}
/// <summary>
/// see https://en.wikipedia.org/wiki/Rhumb_line
/// </summary>
public static LocationCollection CalculateRhumbLineLocations(this Location location1, Location location2, double resolution = 1d)
{
if (resolution <= 0d)
{
throw new ArgumentOutOfRangeException("The parameter resolution must be greater than zero.");
}
var y1 = WebMercatorProjection.LatitudeToY(location1.Latitude);
if (double.IsInfinity(y1))
{
throw new ArgumentOutOfRangeException("The parameter location1 must have an absolute latitude value of less than 90 degrees.");
}
var y2 = WebMercatorProjection.LatitudeToY(location2.Latitude);
if (double.IsInfinity(y2))
{
throw new ArgumentOutOfRangeException("The parameter location2 must have an absolute latitude value of less than 90 degrees.");
}
var x1 = location1.Longitude;
var x2 = location2.Longitude;
var dx = x2 - x1;
var dy = y2 - y1;
var s = Math.Sqrt(dx * dx + dy * dy);
var n = (int)Math.Ceiling(s / resolution);
var locations = new LocationCollection(new Location(location1.Latitude, location1.Longitude));
for (int i = 1; i < n; i++)
{
double x = x1 + i * dx / n;
double y = y1 + i * dy / n;
locations.Add(WebMercatorProjection.YToLatitude(y), x);
}
locations.Add(location2.Latitude, location2.Longitude);
return(locations);
}
public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value)
{
return(LocationCollection.Parse((string)value));
}
/// <summary>
/// Calculates a series of Locations on a rhumb line, or loxodrome, that connects the two specified Locations,
/// with an optional angular resolution specified in degrees.
///
/// See https://en.wikipedia.org/wiki/Rhumb_line
/// </summary>
public static LocationCollection LoxodromeLocations(Location location1, Location location2, double resolution = 1d)
{
if (resolution <= 0d)
{
throw new ArgumentOutOfRangeException(
nameof(resolution), "The resolution argument must be greater than zero.");
}
var lat1 = location1.Latitude;
var lon1 = location1.Longitude;
var lat2 = location2.Latitude;
var lon2 = location2.Longitude;
var y1 = WebMercatorProjection.LatitudeToY(lat1);
var y2 = WebMercatorProjection.LatitudeToY(lat2);
if (double.IsInfinity(y1))
{
throw new ArgumentOutOfRangeException(
nameof(location1), "The location1 argument must have an absolute latitude value of less than 90.");
}
if (double.IsInfinity(y2))
{
throw new ArgumentOutOfRangeException(
nameof(location2), "The location2 argument must have an absolute latitude value of less than 90.");
}
var dlat = lat2 - lat1;
var dlon = lon2 - lon1;
var dy = y2 - y1;
// beta = atan(dlon,dy)
// sec(beta) = 1 / cos(atan(dlon,dy)) = sqrt(1 + (dlon/dy)^2)
var sec = Math.Sqrt(1d + dlon * dlon / (dy * dy));
const double secLimit = 1000d; // beta approximately +/-90°
double s12;
if (sec > secLimit)
{
var lat = (lat1 + lat2) * Math.PI / 360d; // mean latitude
s12 = Math.Abs(dlon * Math.Cos(lat)); // distance in degrees along parallel of latitude
}
else
{
s12 = Math.Abs(dlat * sec); // distance in degrees along loxodrome
}
var n = (int)Math.Ceiling(s12 / resolution);
var locations = new LocationCollection(new Location(lat1, lon1));
if (sec > secLimit)
{
for (var i = 1; i < n; i++)
{
var lon = lon1 + i * dlon / n;
var lat = WebMercatorProjection.YToLatitude(y1 + i * dy / n);
locations.Add(lat, lon);
}
}
else
{
for (var i = 1; i < n; i++)
{
var lat = lat1 + i * dlat / n;
var lon = lon1 + dlon * (WebMercatorProjection.LatitudeToY(lat) - y1) / dy;
locations.Add(lat, lon);
}
}
locations.Add(lat2, lon2);
return(locations);
}
private async Task DrawSymbolOnMap(YouMapsSymbol symbol, TappedRoutedEventArgs e)
{
Point pp = e.GetPosition(myMap);
AddSymbolToMap astm = new AddSymbolToMap(pp);
List<PointCollection> pCollect = await astm.ChangePointToPlaceSymbol();
foreach(PointCollection pc in pCollect)
{
SharpKml.Dom.CoordinateCollection coordCollection = new SharpKml.Dom.CoordinateCollection();
MapControl.LocationCollection locationCollection = new MapControl.LocationCollection();
loadMap.Polylines.Add(new Points.YouMapPolyline { Locations = locationCollection, ColorOfLine = LineColorBrush, LocationAsCords = coordCollection });
foreach(Point p in pc)
{
MapControl.Location location = myMap.ViewportPointToLocation(p);
StyleUserControl sty = new StyleUserControl(LineColorBrush);
loadMap.Polylines.ElementAt(locationInLocationsArray).Locations.Add(location);
loadMap.Polylines.ElementAt(locationInLocationsArray).LocationAsCords.Add(new SharpKml.Base.Vector { Latitude = location.Latitude, Longitude = location.Longitude });
}
locationInLocationsArray++;
}
}
private void drawingPointerHasMoved(object sender, PointerRoutedEventArgs e)
{
if (drawingPointerIsOn && drawingPressedIsOn)
{
AddPointPopup.IsOpen = false;
PointerPoint pp = e.GetCurrentPoint(myMap);
MapControl.Location location = myMap.ViewportPointToLocation(pp.Position);
MapControl.LocationCollection locationCollection = new MapControl.LocationCollection();
StyleUserControl sty = new StyleUserControl(LineColorBrush);
SharpKml.Dom.CoordinateCollection coordCollection = new SharpKml.Dom.CoordinateCollection();
loadMap.Polylines.Add(new Points.YouMapPolyline { Locations = locationCollection,ColorOfLine = LineColorBrush, LocationAsCords = coordCollection});
loadMap.Polylines.ElementAt(locationInLocationsArray).Locations.Add(location);
loadMap.Polylines.ElementAt(locationInLocationsArray).LocationAsCords.Add(new SharpKml.Base.Vector { Latitude = location.Latitude, Longitude = location.Longitude });
}
}
/// <summary>
/// Find the center of the bounding box of a collection of locations
/// </summary>
/// <param name="locations"></param>
/// <returns></returns>
public static (Location, Location) Extent(PolygonCollection collection)
{
return(LocationCollection.Min(collection.Flatten()),
LocationCollection.Max(collection.Flatten()));
}
/// <summary>
/// Find the center of the bounding box of a collection of locations
/// </summary>
/// <param name="locations"></param>
/// <returns></returns>
public static Location Center(PolygonCollection collection)
{
return(LocationCollection.Center(collection.Flatten()));
}