/// <summary>
/// Encodes a bearing based on the list of coordinates and the BEARDIST parameter.
/// </summary>
public static float EncodeBearing(List <OpenLR.Model.Coordinate> coordinates)
{
var distance = 0.0;
var previous = coordinates[0];
OpenLR.Model.Coordinate bearingPosition = null;
for (int idx = 1; idx < coordinates.Count; idx++)
{
var current = new OpenLR.Model.Coordinate()
{
Latitude = coordinates[idx].Latitude,
Longitude = coordinates[idx].Longitude
};
var currentSegmentDistance = Coordinate.DistanceEstimateInMeter((float)current.Latitude, (float)current.Longitude,
(float)previous.Latitude, (float)previous.Longitude);
var currentDistance = currentSegmentDistance + distance;
if (currentDistance > Parameters.BEARDIST)
{ // the coordinate to calculate the beardist is in this segment!
// calculate where.
var relativeDistance = Parameters.BEARDIST - distance;
var relativeOffset = relativeDistance / currentSegmentDistance;
bearingPosition = new OpenLR.Model.Coordinate()
{
Latitude = (float)(previous.Latitude + ((current.Latitude - previous.Latitude) * relativeOffset)),
Longitude = (float)(previous.Longitude + ((current.Longitude - previous.Longitude) * relativeOffset))
};
break;
}
distance = currentDistance;
previous = current;
}
if (bearingPosition == null)
{ // use the toCoordinate as the last 'current'.
// if edge is too short use target coordinate.
bearingPosition = coordinates[coordinates.Count - 1];
}
var north = new Coordinate((float)coordinates[0].Latitude + 1, (float)coordinates[0].Longitude);
var angleRadians = DirectionCalculator.Angle(new Coordinate((float)bearingPosition.Latitude, (float)bearingPosition.Longitude),
new Coordinate((float)coordinates[0].Latitude, (float)coordinates[0].Longitude), north);
var angleDegrees = (float)(angleRadians * (180 / Math.PI));
return(angleDegrees);
}
/// <summary>
/// Converts this line location to features.
/// </summary>
public static Coordinate ToCoordinate(this OpenLR.Model.Coordinate coordinate)
{
return(new Coordinate(coordinate.Longitude, coordinate.Latitude));
}
