private async void MeasureButton_Click(object sender, RoutedEventArgs e)
{
try
{
pauseButton.IsEnabled = true;
pauseButton.Icon = new SymbolIcon(Symbol.Pause);
pauseButton.Label = "Suspend";
MyMapView.SketchEditor.IsEnabled = true;
measurementOutput.Text = "Click the map to begin the measure";
var geometry = await MyMapView.SketchEditor.StartAsync(Esri.ArcGISRuntime.UI.SketchCreationMode.Polyline);
var polyline = geometry as Polyline;
if (polyline != null && polyline.Parts != null && polyline.Parts.Count > 0)
{
var result = new StringBuilder();
var totalLength = GeometryEngine.LengthGeodetic(polyline);
result.AppendFormat("Total Length\t:\t{0:0} m\n", totalLength);
var polygon = new Polygon(polyline.Parts, polyline.SpatialReference);
var area = GeometryEngine.AreaGeodetic(polygon);
result.AppendFormat("Area\t\t:\t{0:0} m²\n", area);
measurementOutput.Text = result.ToString();
}
}
catch (TaskCanceledException)
{
}
catch (Exception ex)
{
measurementOutput.Text = ex.Message;
}
pauseButton.IsEnabled = false;
pauseButton.Icon = new SymbolIcon(Symbol.Play);
}
private void MySceneView_MouseDoubleClick(object sender, MouseEventArgs e)
{
if (type == "line" && mapPoint_list.Count != 0)
{
BorderContentText.Visibility = Visibility.Visible;
var boatPositions = new PolylineBuilder(SpatialReferences.Wgs84);
for (var i = 0; i < mapPoint_list.Count; i++)
{
boatPositions.AddPoint(new MapPoint(mapPoint_list[i].X, mapPoint_list[i].Y));
}
var boatRoute = boatPositions.ToGeometry();
_mapViewModel.Line(boatRoute, "line");
LineText.Text = "Line Length: " + GeometryEngine.LengthGeodetic(boatRoute).ToString("N2") + " meters";
}
else if (type == "area" && mapPoint_list.Count != 0)
{
BorderContentText.Visibility = Visibility.Visible;
var boatPositions = new PolygonBuilder(SpatialReferences.Wgs84);
for (var i = 0; i < mapPoint_list.Count; i++)
{
boatPositions.AddPoint(new MapPoint(mapPoint_list[i].X, mapPoint_list[i].Y));
}
var boatRoute = boatPositions.ToGeometry();
_mapViewModel.Area(boatRoute);
AreaText.Text = "Area Size: " + GeometryEngine.AreaGeodetic(boatRoute).ToString("N2") + " square meters";
}
mapPoint_list.Clear();
}
private void SketchEditor_GeometryChanged(object sender, Esri.ArcGISRuntime.UI.GeometryChangedEventArgs e)
{
var polyline = e.NewGeometry as Polyline;
var result = new StringBuilder();
var totalLength = GeometryEngine.LengthGeodetic(polyline);
result.AppendFormat("Total Length\t:\t{0:0} m\n", totalLength);
var polygon = new Polygon(polyline.Parts, polyline.SpatialReference);
var area = GeometryEngine.AreaGeodetic(polygon);
result.AppendFormat("Area\t\t:\t{0:0} m²\n", area);
measurementOutput.Text = result.ToString();
}
/// <summary>
/// Displays the measurement result
/// </summary>
/// <param name="geometry">geometry to measure</param>
private void DisplayResult(Geometry.Geometry geometry = null)
{
if (_measureResultTextBlock != null)
{
double measurement = 0;
if (geometry == null)
{
switch (Mode)
{
case MeasureToolbarMode.Line:
{
geometry = LineSketchEditor.Geometry;
break;
}
case MeasureToolbarMode.Area:
{
geometry = AreaSketchEditor.Geometry;
break;
}
case MeasureToolbarMode.Feature:
{
geometry = _measureFeatureResultOverlay.Graphics.FirstOrDefault()?.Geometry;
break;
}
}
}
if (geometry is Polyline)
{
measurement = GeometryEngine.LengthGeodetic(geometry, SelectedLinearUnit, GeodeticCurveType.ShapePreserving);
}
else if (geometry is Polygon || geometry is Envelope)
{
measurement = GeometryEngine.AreaGeodetic(geometry, SelectedAreaUnit, GeodeticCurveType.ShapePreserving);
}
if (geometry == null)
{
var instruction = Mode == MeasureToolbarMode.None ?
"Toggle a measure mode" : (Mode == MeasureToolbarMode.Feature ? "Tap a feature" : "Tap to sketch");
_measureResultTextBlock.Text = instruction;
}
else
{
_measureResultTextBlock.Text = string.Format("{0:0,0.00}", measurement);
}
}
}
private void Update(ShapefileFeatureTable sf, CancellationToken ct, IProgress <int> p)
{
Task.Run(async() =>
{
var directory = Globals.Model.Assets.PathTo("BasinShapefile");
if (String.IsNullOrWhiteSpace(directory))
{
MessageBox.Show("You need to have imported a basin shapefile.");
Clear();
return;
}
var file = Directory.EnumerateFiles(directory, "*.shp").FirstOrDefault();
if (String.IsNullOrWhiteSpace(file))
{
MessageBox.Show("Error reading the basin shapefile.");
Clear();
return;
}
var ci = Globals.Model.EcosystemVitality.FetchIndicator <ConnectivityIndicator>();
var reaches = ci?.Reaches;
if (reaches == null)
{
MessageBox.Show(
"You must import a river network for the Connectivity Indicator in Ecosystem Vitality.");
Clear();
return;
}
var bsf = await ShapefileFeatureTable.OpenAsync(file);
var allQuery = new QueryParameters
{
Geometry = bsf.Extent,
SpatialRelationship = SpatialRelationship.Contains
};
ConservationAreaIndicator.TotalProtectedArea = 0;
ConservationAreaIndicator.TotalArea = 0;
foreach (var mapFeature in await bsf.QueryFeaturesAsync(allQuery))
{
if (ct.IsCancellationRequested)
{
Clear();
return;
}
ConservationAreaIndicator.TotalArea += GeometryEngine.AreaGeodetic(mapFeature.Geometry);
var areaFeatures = await sf.QueryFeaturesAsync(new QueryParameters
{
Geometry = mapFeature.Geometry,
SpatialRelationship = SpatialRelationship.Contains
});
foreach (var feature in areaFeatures)
{
ConservationAreaIndicator.TotalProtectedArea += GeometryEngine.AreaGeodetic(feature.Geometry);
if (ct.IsCancellationRequested)
{
Clear();
return;
}
}
}
p.Report(25);
// todo: this is not an efficient algorithm
var pb = new PolylineBuilder(new SpatialReference(Model.Attributes.Wkid));
foreach (var reach in reaches)
{
pb.AddPart(
reach.Nodes.Select(node => new MapPoint(node.Location.Longitude, node.Location.Latitude)));
}
var mapGeometry = pb.ToGeometry();
ConservationAreaIndicator.TotalLength = GeometryEngine.Length(mapGeometry);
if (ct.IsCancellationRequested)
{
Clear();
return;
}
var lengthFeatures = await sf.QueryFeaturesAsync(new QueryParameters
{
Geometry = sf.Extent,
SpatialRelationship = SpatialRelationship.Contains
});
var tpl = 0.0;
var reachNumber = 0;
foreach (var reach in reaches)
{
var poly = new PolylineBuilder(new SpatialReference(Model.Attributes.Wkid));
poly.AddPart(reach.Nodes.Select(node =>
new MapPoint(node.Location.Longitude, node.Location.Latitude)));
var pg = poly.ToGeometry();
foreach (var feature in lengthFeatures)
{
var intersection = GeometryEngine.Intersection(pg, feature.Geometry) as Polyline;
if (intersection?.Parts.Count > 0)
{
tpl += GeometryEngine.Length(pg);
}
if (ct.IsCancellationRequested)
{
Clear();
return;
}
}
p.Report(25 + (int)(75.0 * reachNumber++ / reaches.Count));
}
ConservationAreaIndicator.TotalProtectedLength = tpl;
}, ct).Wait(ct);
}