private async void PopulateParametersAndSolveRouteAsync()
{
try
{
// Set facilities and incident in parameters.
ClosestFacilityParameters closestFacilityParameters = await _task.CreateDefaultParametersAsync();
closestFacilityParameters.SetFacilities(_facilities);
closestFacilityParameters.SetIncidents(new List <Incident> {
new Incident(_incidentPoint)
});
// Use the task to solve for the closest facility.
ClosestFacilityResult result = await _task.SolveClosestFacilityAsync(closestFacilityParameters);
// Get the index of the closest facility to incident. (0) is the index of the incident, [0] is the index of the closest facility.
int closestFacility = result.GetRankedFacilityIndexes(0)[0];
// Get route from closest facility to the incident and display to mapview.
ClosestFacilityRoute route = result.GetRoute(closestFacility, 0);
// Add graphics for the incident and route.
_incidentGraphicsOverlay.Graphics.Add(new Graphic(_incidentPoint, _incidentSymbol));
_incidentGraphicsOverlay.Graphics.Add(new Graphic(route.RouteGeometry, _routeSymbol));
}
catch (Esri.ArcGISRuntime.Http.ArcGISWebException exception)
{
if (exception.Message.Equals("Unable to complete operation."))
{
CreateErrorDialog("Incident not within San Diego area!");
}
else
{
CreateErrorDialog("An ArcGIS web exception occurred. \n" + exception.Message);
}
}
}
private async void SolveRoutesButton_Click(object sender, EventArgs e)
{
// Holds locations of hospitals around San Diego.
List <Facility> facilities = new List <Facility>();
// Holds locations of hospitals around San Diego.
List <Incident> incidents = new List <Incident>();
// Create query parameters to select all features.
QueryParameters queryParams = new QueryParameters()
{
WhereClause = "1=1"
};
// Query all features in the facility table.
FeatureQueryResult facilityResult = await _facilityTable.QueryFeaturesAsync(queryParams);
// Add all of the query results to facilities as new Facility objects.
facilities.AddRange(facilityResult.ToList().Select(feature => new Facility((MapPoint)feature.Geometry)));
// Query all features in the incident table.
FeatureQueryResult incidentResult = await _incidentTable.QueryFeaturesAsync(queryParams);
// Add all of the query results to facilities as new Incident objects.
incidents.AddRange(incidentResult.ToList().Select(feature => new Incident((MapPoint)feature.Geometry)));
// Set facilities and incident in parameters.
ClosestFacilityParameters closestFacilityParameters = await _task.CreateDefaultParametersAsync();
closestFacilityParameters.SetFacilities(facilities);
closestFacilityParameters.SetIncidents(incidents);
try
{
// Use the task to solve for the closest facility.
ClosestFacilityResult result = await _task.SolveClosestFacilityAsync(closestFacilityParameters);
for (int i = 0; i < incidents.Count; i++)
{
// Get the index of the closest facility to incident. (i) is the index of the incident, [0] is the index of the closest facility.
int closestFacility = result.GetRankedFacilityIndexes(i)[0];
// Get the route to the closest facility.
ClosestFacilityRoute route = result.GetRoute(closestFacility, i);
// Display the route on the graphics overlay.
_myMapView.GraphicsOverlays[0].Graphics.Add(new Graphic(route.RouteGeometry, _routeSymbols[i % _routeSymbols.Count]));
}
// Disable the solve button.
_solveRoutesButton.Enabled = false;
_solveRoutesButton.SetTitleColor(UIColor.Gray, UIControlState.Disabled);
// Enable the reset button.
_resetButton.Enabled = true;
_resetButton.SetTitleColor(UIColor.Blue, UIControlState.Normal);
}
catch (Esri.ArcGISRuntime.Http.ArcGISWebException exception)
{
CreateErrorDialog("An ArcGIS web exception occurred.\n" + exception.Message);
}
}