/// <summary>
/// Inserts a via way point at the specified position.
/// </summary>
/// <param name="p">Location of the via way point</param>
/// <param name="style">Display style of the via way point</param>
/// <returns>The newly created via way point</returns>
private Via InsertVia(Point p, ShapeStyle style)
{
// create the way point and set owner
var via = new Via(layer, p, style)
{
Route = this
};
// find the index where to insert the via way point and insert it there
Via.Insert(GetViaIndex(via), via);
// try to update the snapshot if that is possible
if (snapshot.Valid(Via.Count + 1))
{
snapshot.Indices = snapshot.Indices.Insert(Via.IndexOf(via) + 1, via.PolyIndex);
}
else
{
snapshot = new RouteSnapshot();
}
// force via way point z index update
UpdateZIndex(ZIndex, false, true);
// return the newly created via way point
return(via);
}
/// <summary>
/// Merges this route with another route.
/// This is usually triggered if a stop is removed.
/// </summary>
/// <param name="other"></param>
public void MergeWith(Route other)
{
// invalidate snapshot, force full calculation
//
// TODO: this could be optimized. If both routes have a
// valid snapshot we could create combined snapshot. The update
// section would then be:
//
// from = Via.Count (<- the count before other via way points have been inserted)
// to = from + 1;
snapshot = new RouteSnapshot();
// transfer other via way points
Via.AddRange(other.Via);
// set new owner
other.Via.ForEach(via => via.Route = this);
// update the z index of the via way points
UpdateZIndex(ZIndex, false, true);
// clear via way points of other route
other.Via.Clear();
// try to display sort of a preview and trigger update
UpdateRoutePolylines(Points.Concat(other.Points), "", RouteLayer.ROUTE);
UpdateRoute(GetRequestData(), null);
}
/// <summary>
/// Removes a via way point from the route.
/// </summary>
/// <param name="wayPoint"></param>
public void Remove(WayPoint wayPoint)
{
// get way point index
int idx = WayPoints.ToList().IndexOf(wayPoint);
// remove from via list
Via.RemoveAt(idx - 1);
// try to update snapshot also, if that is possible
if (snapshot.Valid(Via.Count + 3))
{
snapshot.Indices = snapshot.Indices.RemoveAt(idx);
}
else
{
snapshot = new RouteSnapshot();
}
// dispose way point - removes the way point from the map
wayPoint.Dispose();
// update z indices of via way points
UpdateZIndex(ZIndex, false, true);
// update route, try a delta update for the portion that changed
UpdateRoute(GetRequestData(idx - 1, idx), null);
}
/// <summary>
/// Creates and initializes a RequestData object.
/// </summary>
/// <param name="from">Index of the way point marking the begin of the route section that is going to change.</param>
/// <param name="to">Index of the way point marking the end of the route section that is going to change.</param>
/// <param name="wayPoints">The route way points</param>
/// <param name="updateHash">The hash of previous update operations</param>
/// <param name="snapshot">The snapshot of the current route</param>
public RequestData(int from, int to, WayPoint[] wayPoints, ulong?updateHash, RouteSnapshot snapshot)
{
// unique, consecutive id of the data object
Id = NextId++;
// make update hash out of the way point indices
Hash = ((ulong)from << 32) | (ulong)to;
// initialize snapshots objects
Left = new RouteSnapshot();
Right = new RouteSnapshot();
if (wayPoints == null)
{
return;
}
// if there are way points ...
OriginalWayPoints = wayPoints;
// get and store the full list of way points and its labels
RequestWaypoints = Waypoints = wayPoints.Select(s => s.Waypoint).ToArray();
Labels = wayPoints.Select(s => s is Stop ? ((Stop)s).Label : "").ToArray();
// if the specified snapshot is valid and the hash matches the hash of previous
// updates then we only need to update a portion of the route.
//
// If the hashes don't match we have multiple pending updates that each update a
// different section of the route. In this case we use this data object to force
// a full update.
if (!snapshot.Valid(wayPoints.Length + 2) || (updateHash.HasValue && updateHash.Value != Hash))
{
return;
}
// get the way points of the route portion to be updated
RequestWaypoints = Waypoints.Take(to + 1).Skip(@from).ToArray();
// beginning and end must be a stop - remove any via type set
RequestWaypoints.First().viaType = null;
RequestWaypoints.Last().viaType = null;
// get the parts of the route that remain stable
Right = snapshot.Right(to);
Left = snapshot.Left(@from);
}
/// <summary>
/// Concatenates two snapshots.
/// </summary>
/// <param name="other">Snapshot to concat.</param>
/// <returns>Concatenated snapshots.</returns>
private RouteSnapshot Concat(RouteSnapshot other)
{
if (!ValidExceptRouteInfo())
{
return(other);
}
if (!other.ValidExceptRouteInfo())
{
return(this);
}
return(new RouteSnapshot(
Indices.Concat(other.Indices.Skip(1).Select(i => i + Points.Length)),
Points.Concat(other.Points),
Info ?? other.Info
));
}
/// <summary>
/// Gets optimized request data for the specified portion of the route that changed.
/// </summary>
/// <param name="changesFrom">Index of the way point marking the begin of the route section that changed.</param>
/// <param name="changesTo">Index of the way point marking the end of the route section that changed.</param>
/// <returns>Request data object</returns>
private RequestData GetRequestData(int changesFrom, int changesTo)
{
// be sure the indices are in range
changesFrom = Math.Max(changesFrom, 0);
changesTo = Math.Min(changesTo, Via.Count + 1);
// create request data object
var data = new RequestData(changesFrom, changesTo,
CanCalculate ? WayPoints.ToArray() : null, updateHash, snapshot);
// see if snapshot must be invalidated
if (!snapshot.Valid(Via.Count + 2) || (updateHash.HasValue && updateHash.Value != data.Hash))
{
snapshot = new RouteSnapshot();
}
// done
return(data);
}
/// <summary>
/// Called when an update ends.
/// </summary>
/// <param name="resp"></param>
/// <param name="bFromTimer"></param>
private void EndUpdate(RouteSnapshot resp = null, bool bFromTimer = false)
{
// decrement update counter. If there are no pending updates ...
if (Interlocked.Decrement(ref updateRef) != 0)
{
return;
}
// reset update hash
updateHash = null;
// if end update has been triggered by the update timer (no matter in what way)
// other updates will start soon. In this case do no update snapshot and tooltip.
if (bFromTimer)
{
return;
}
snapshot = resp ?? new RouteSnapshot();
layer.UpdateRouteToolTips();
}
/// <summary>
/// Handles the route calculation results.
/// </summary>
/// <param name="result">Route calculation results.</param>
public void RouteCalculated(IAsyncResult result)
{
layer.Map.Dispatcher.Invoke((Action)(() =>
{
// get request data and initialize a snapshot
var req = (RequestData)result.AsyncState;
var routeSnapshot = new RouteSnapshot();
try
{
// skip this response if there are newer responses
// that have already been processed.
if (req.Id < latestIdCalculated)
{
return;
}
// store request id
latestIdCalculated = req.Id;
// get route result
var route = xRoute.EndcalculateRoute(result);
// create snapshot out of route result
routeSnapshot = RouteSnapshot.FromXRoute(
route.wrappedStations.Select(w => w.polyIdx).ToArray(),
wkbReader.Read(route.polygon.wkb).Coordinates.Select(p => p.PtvSmartUnitsToWgs84()).ToArray(),
route.info
);
// merge snapshot with request data. If only a part of the route has
// been updated, this step creates the 'full route information'
routeSnapshot.MergeWithRequest(req);
var toolTip = FormatRouteToolTip(req.Labels.First(), req.Labels.Last(), routeSnapshot.Info);
UpdateRoutePolylines(routeSnapshot.Points, toolTip, RouteLayer.ROUTE);
// if there are no pending updates also set calculationSucceeded flag
// and store the polygon indices of the via way points
if (updateRef == 1)
{
calculationSucceeded = routeSnapshot.Valid(Via.Count + 2);
if (calculationSucceeded)
{
for (int i = 0; i < routeSnapshot.Indices.Length; ++i)
{
if (i == 0 || i == routeSnapshot.Indices.Length - 1)
{
if (req.OriginalWayPoints[i] is Stop)
{
((Stop)req.OriginalWayPoints[i]).LinkPoint = routeSnapshot.Points[Math.Min(routeSnapshot.Points.Length - 1, routeSnapshot.Indices[i])];
}
}
else
{
Via[i - 1].PolyIndex = routeSnapshot.Indices[i];
}
}
}
}
}
catch (Exception e)
{
// Response processing failed. If there are no pending updates we create an error polyline here.
// We also invalidate the route snapshot and set the exception message as the tool tip.
if (updateRef == 1)
{
Func <WaypointDesc, Point> WaypointToPoint = wp => wp.wrappedCoords[0].point.PtvSmartUnitsToWgs84();
UpdateRoutePolylines(req.Waypoints.Select(WaypointToPoint), e.Message, RouteLayer.ROUTE_ERROR);
routeSnapshot = new RouteSnapshot();
}
}
// another update done
EndUpdate(routeSnapshot);
}), DispatcherPriority.Send, null);
}
