/// <summary>
/// Encodes the given location.
/// </summary>
public static LineLocation Encode(ReferencedLine referencedLocation, Coder coder, EncodingSettings settings)
{
try
{
// Step – 1: Check validity of the location and offsets to be encoded.
// validate connected and traversal.
referencedLocation.ValidateConnected(coder);
// validate offsets.
referencedLocation.ValidateOffsets();
// validate for binary.
referencedLocation.ValidateBinary();
// Step – 2 Adjust start and end node of the location to represent valid map nodes.
referencedLocation.AdjustToValidPoints(coder);
// keep a list of LR-point.
var points = new List <int>(new int[] { 0, referencedLocation.Vertices.Length - 1 });
// Step – 3 Determine coverage of the location by a shortest-path.
// Step – 4 Check whether the calculated shortest-path covers the location completely.
// Go to step 5 if the location is not covered completely, go to step 7 if the location is covered.
// Step – 5 Determine the position of a new intermediate location reference point so that the part of the
// location between the start of the shortest-path calculation and the new intermediate is covered
// completely by a shortest-path.
// Step – 6 Go to step 3 and restart shortest path calculation between the new intermediate location reference
// point and the end of the location.
if (settings.VerifyShortestPath)
{
bool isOnShortestPath = false;
while (!isOnShortestPath)
{ // keep on adding intermediates until all paths between intermediates are on shortest paths.
isOnShortestPath = true;
// loop over all LRP-pairs.
for (var i = 0; i < points.Count - 1; i++)
{
var fromPoint = points[i];
var toPoint = points[i + 1];
var fromEdge = referencedLocation.Edges[fromPoint];
var toEdge = referencedLocation.Edges[toPoint - 1];
var edgeCount = toPoint - fromPoint;
// calculate shortest path between their first and last edge.
var pathResult = coder.Router.TryCalculateRaw(coder.Profile.Profile,
coder.Router.GetDefaultWeightHandler(coder.Profile.Profile),
fromEdge, toEdge, coder.Profile.RoutingSettings);
if (pathResult.IsError)
{
try
{
coder.Profile.RoutingSettings.SetMaxSearch(coder.Profile.Profile.FullName, float.MaxValue);
pathResult = coder.Router.TryCalculateRaw(coder.Profile.Profile,
coder.Router.GetDefaultWeightHandler(coder.Profile.Profile),
fromEdge, toEdge, coder.Profile.RoutingSettings);
if (pathResult.IsError)
{
throw new Exception("No path found between two edges of the line location.");
}
}
catch
{
throw;
}
finally
{
coder.Profile.RoutingSettings.SetMaxSearch(coder.Profile.Profile.FullName, coder.Profile.MaxSearch);
}
}
var path = pathResult.Value;
var edges = new List <long>();
while (path.From != null)
{
edges.Add(path.Edge);
path = path.From;
}
edges.Reverse();
// calculate converage.
var splitAt = -1;
for (var j = 0; j < edges.Count; j++)
{
var locationEdgeIdx = j + fromPoint;
if (locationEdgeIdx >= referencedLocation.Edges.Length ||
edges[j] != referencedLocation.Edges[locationEdgeIdx])
{
splitAt = j + fromPoint + 1;
break;
}
}
// split if needed.
if (splitAt != -1)
{
points.Add(splitAt);
points.Sort();
isOnShortestPath = false;
break;
}
}
}
}
// Step – 7 Concatenate the calculated shortest-paths for a complete coverage of the location and form an
// ordered list of location reference points (from the start to the end of the location).
// Step – 8 Check validity of the location reference path. If the location reference path is invalid then go
// to step 9, if the location reference path is valid then go to step 10.
// Step – 9 Add a sufficient number of additional intermediate location reference points if the distance
// between two location reference points exceeds the maximum distance. Remove the start/end LR-point
// if the positive/negative offset value exceeds the length of the corresponding path.
referencedLocation.AdjustToValidDistance(coder, points);
// Step – 10 Create physical representation of the location reference.
var coordinates = referencedLocation.GetCoordinates(coder.Router.Db);
var length = coordinates.Length();
// 3: The actual encoding now!
// initialize location.
var location = new LineLocation();
// build lrp's.
var locationReferencePoints = new List <LocationReferencePoint>();
for (var idx = 0; idx < points.Count - 1; idx++)
{
locationReferencePoints.Add(referencedLocation.BuildLocationReferencePoint(coder,
points[idx], points[idx + 1]));
}
locationReferencePoints.Add(referencedLocation.BuildLocationReferencePointLast(
coder, points[points.Count - 2]));
// build location.
location.First = locationReferencePoints[0];
location.Intermediate = new LocationReferencePoint[locationReferencePoints.Count - 2];
for (var idx = 1; idx < locationReferencePoints.Count - 1; idx++)
{
location.Intermediate[idx - 1] = locationReferencePoints[idx];
}
location.Last = locationReferencePoints[locationReferencePoints.Count - 1];
// set offsets.
location.PositiveOffsetPercentage = referencedLocation.PositiveOffsetPercentage;
location.NegativeOffsetPercentage = referencedLocation.NegativeOffsetPercentage;
return(location);
}
catch (ReferencedEncodingException)
{ // rethrow referenced encoding exception.
throw;
}
catch (Exception ex)
{ // unhandled exception!
throw new ReferencedEncodingException(referencedLocation,
string.Format("Unhandled exception during ReferencedLineEncoder: {0}", ex.ToString()), ex);
}
}
