private void MyMapViewOnGeoViewTapped_Area(object sender, GeoViewInputEventArgs geoViewInputEventArgs)
{
// Get the tapped point, projected to WGS84.
MapPoint destination = (MapPoint)GeometryEngine.Project(geoViewInputEventArgs.Location, SpatialReferences.Wgs84);
// 点集（mapPoints） ——记得清空
mapPoints.Add(destination);
int len = mapPoints.Count();
Esri.ArcGISRuntime.Geometry.PointCollection polygonPoints;
Esri.ArcGISRuntime.Geometry.Geometry areaGeometry;
Esri.ArcGISRuntime.Geometry.Polygon routeArea;
if (len > 2)
{
polygonPoints = new Esri.ArcGISRuntime.Geometry.PointCollection(SpatialReferences.Wgs84)
{
mapPoints[len - 3],
mapPoints[len - 2],
destination
};
routeArea = new Esri.ArcGISRuntime.Geometry.Polygon(polygonPoints);
//pathGeometry = GeometryEngine.DensifyGeodetic(routeArea, 1, LinearUnits.Kilometers, GeodeticCurveType.Geodesic);
// 这是测地线的长度
//double distance = GeometryEngine.LengthGeodetic(pathGeometry, LinearUnits.Kilometers, GeodeticCurveType.Geodesic);
double area = GeometryEngine.Area(routeArea);
if (areaList.Count() != 0)
{
area += areaList[areaList.Count() - 1];
}
areaList.Add(area);
myMeasureResult.Text += "\n" + area + " (地图默认面积单位)";
}
}
private async void MyMapView_GeoViewTapped(object sender, GeoViewInputEventArgs e)
{
// Identify the tapped graphics.
IdentifyGraphicsOverlayResult result = null;
try
{
result = await _myMapView.IdentifyGraphicsOverlayAsync(_graphicsOverlay, e.Position, 1, false);
}
catch (Exception ex)
{
new UIAlertView("Error", ex.ToString(), (IUIAlertViewDelegate)null, "OK", null).Show();
}
// Return if there are no results.
if (result == null || result.Graphics.Count < 1)
{
return;
}
// Get the smallest identified graphic.
Graphic identifiedGraphic = result.Graphics.OrderBy(graphic => GeometryEngine.Area(graphic.Geometry)).First();
// Clear any existing selection, then select the tapped graphic.
_graphicsOverlay.ClearSelection();
identifiedGraphic.IsSelected = true;
// Get the selected graphic's geometry.
Geometry selectedGeometry = identifiedGraphic.Geometry;
// Perform the calculation and show the results.
_resultTextView.Text = GetOutputText(selectedGeometry);
}
public static decimal GetArea(this Geometry geometry)
{
try
{
var projectArea = GeometryEngine.Area(GeometryEngine.Simplify(geometry as Polygon));
double projectAreaHa = AreaUnits.Hectares.FromSquareMeters(projectArea);
decimal insideItemArea = Convert.ToDecimal(Math.Round(projectAreaHa, 2, MidpointRounding.AwayFromZero));
return(insideItemArea);
}
catch (Exception ex)
{
Debug.WriteLine(ex.Message);
}
return(0);
}
private async Task doCalculateAreaAndLength()
{
try
{
//Wait for user to draw
var geom = await mapView1.Editor.RequestShapeAsync(DrawShape.Polygon);
//show geometry on map
_graphicsOverlay.Graphics.Clear();
var g = new Graphic {
Geometry = geom, Symbol = LayoutRoot.Resources["DefaultFillSymbol"] as Esri.ArcGISRuntime.Symbology.Symbol
};
_graphicsOverlay.Graphics.Add(g);
//Calculate results
var areaPlanar = GeometryEngine.Area(geom);
ResultsAreaPlanar.Text = string.Format("{0} millas cuad.", (areaPlanar * toSqMilesConversion).ToString("n3"));
var perimPlanar = GeometryEngine.Length(geom);
ResultsPerimeterPlanar.Text = string.Format("{0} millas", (perimPlanar * toMilesConversion).ToString("n3"));
var areaGeodesic = GeometryEngine.GeodesicArea(geom);
ResultsAreaGeodesic.Text = string.Format("{0} millas cuad.", (areaGeodesic * toSqMilesConversion).ToString("n3"));
var perimGeodesic = GeometryEngine.GeodesicLength(geom);
ResultsPerimeterGeodesic.Text = string.Format("{0} millas cuad.", (perimGeodesic * toMilesConversion).ToString("n3"));
//Instructions.Visibility = Windows.UI.Xaml.Visibility.Collapsed;
Results.Visibility = Windows.UI.Xaml.Visibility.Visible;
Reiniciar.IsEnabled = true;
}
catch (System.Threading.Tasks.TaskCanceledException)
{
var dlg = new MessageDialog("El trazado actual ha sido cancelado.", "Tarea Cancelada!");
var _x = dlg.ShowAsync();
}
}
private async Task DoCalculateAreaAndLengthAsync()
{
try
{
//Wait for user to draw
var geom = await MyMapView.Editor.RequestShapeAsync(DrawShape.Polygon);
//show geometry on map
_graphicsOverlay.Graphics.Clear();
var g = new Graphic
{
Geometry = geom,
Symbol = LayoutRoot.Resources["DefaultFillSymbol"] as Esri.ArcGISRuntime.Symbology.Symbol
};
_graphicsOverlay.Graphics.Add(g);
//Calculate results
var areaPlanar = GeometryEngine.Area(geom);
ResultsAreaPlanar.Text = string.Format("{0} sq. miles", (areaPlanar * toSqMilesConversion).ToString("n3"));
var perimPlanar = GeometryEngine.Length(geom);
ResultsPerimeterPlanar.Text = string.Format("{0} miles", (perimPlanar * toMilesConversion).ToString("n3"));
var areaGeodesic = GeometryEngine.GeodesicArea(geom);
ResultsAreaGeodesic.Text = string.Format("{0} sq. miles", (areaGeodesic * toSqMilesConversion).ToString("n3"));
var perimGeodesic = GeometryEngine.GeodesicLength(geom);
ResultsPerimeterGeodesic.Text = string.Format("{0} miles", (perimGeodesic * toMilesConversion).ToString("n3"));
Instructions.Visibility = Windows.UI.Xaml.Visibility.Collapsed;
Results.Visibility = Windows.UI.Xaml.Visibility.Visible;
}
catch (TaskCanceledException)
{
var _x = new MessageDialog("Current sketch has been canceled.", "Task Canceled!").ShowAsync();
}
}
private async Task doCalculateAreaAndLength()
{
try
{
// Wait for user to draw
var geom = await mapView.Editor.RequestShapeAsync(DrawShape.Polygon);
// show geometry on map
graphicsLayer.Graphics.Clear();
var graphic = new Graphic {
Geometry = geom, Symbol = LayoutRoot.Resources["DefaultFillSymbol"] as Symbol
};
graphicsLayer.Graphics.Add(graphic);
// Calculate results
var areaPlanar = GeometryEngine.Area(geom);
ResultsAreaPlanar.Text = string.Format("{0} sq. miles", (areaPlanar * toSqMilesConversion).ToString("n3"));
var perimPlanar = GeometryEngine.Length(geom);
ResultsPerimeterPlanar.Text = string.Format("{0} miles", (perimPlanar * toMilesConversion).ToString("n3"));
var areaGeodesic = GeometryEngine.GeodesicArea(geom);
ResultsAreaGeodesic.Text = string.Format("{0} sq. miles", (areaGeodesic * toSqMilesConversion).ToString("n3"));
var perimGeodesic = GeometryEngine.GeodesicLength(geom);
ResultsPerimeterGeodesic.Text = string.Format("{0} miles", (perimGeodesic * toMilesConversion).ToString("n3"));
Instructions.Visibility = Visibility.Collapsed;
Results.Visibility = Visibility.Visible;
}
catch (TaskCanceledException)
{
MessageBox.Show("Current sketch has been canceled.", "Task Canceled!");
}
}
private async void MyMapView_GeoViewTapped(object sender, Esri.ArcGISRuntime.Xamarin.Forms.GeoViewInputEventArgs e)
{
// First clear any existing selections
ClearAllSelections();
// Perform the identify operation
IReadOnlyList <IdentifyLayerResult> results = await MyMapView.IdentifyLayersAsync(e.Position, 5, false);
// Return if there are no results
if (results.Count < 1)
{
return;
}
// Get the results that are from ENC layers
IEnumerable <IdentifyLayerResult> encResults = results.Where(result => result.LayerContent is EncLayer);
// Get the ENC results that have features
IEnumerable <IdentifyLayerResult> encResultsWithFeatures = encResults.Where(result => result.GeoElements.Count > 0);
// Get the first result with ENC features
IdentifyLayerResult firstResult = encResultsWithFeatures.First();
// Get the layer associated with this set of results
EncLayer containingLayer = firstResult.LayerContent as EncLayer;
// Select the smallest (area) feature in the layer.
EncFeature smallestFeature = (EncFeature)firstResult.GeoElements.OrderBy(f => GeometryEngine.Area(f.Geometry)).First();
// Select the feature.
containingLayer.SelectFeature(smallestFeature);
// Create the callout definition.
CalloutDefinition definition = new CalloutDefinition(smallestFeature.Acronym, smallestFeature.Description);
// Show the callout
MyMapView.ShowCalloutAt(e.Location, definition);
}
private async void MyMapView_GeoViewTapped(object sender, GeoViewInputEventArgs e)
{
// First clear any existing selections.
ClearAllSelections();
try
{
// Perform the identify operation.
IReadOnlyList <IdentifyLayerResult> results = await _myMapView.IdentifyLayersAsync(e.Position, 5, false);
// Return if there are no results.
if (results.Count < 1)
{
return;
}
// Get the results that are from ENC layers.
IEnumerable <IdentifyLayerResult> encResults = results.Where(result => result.LayerContent is EncLayer);
// Get the ENC results that have features.
IEnumerable <IdentifyLayerResult> encResultsWithFeatures = encResults.Where(result => result.GeoElements.Count > 0);
// Get the first result with ENC features.
IdentifyLayerResult firstResult = encResultsWithFeatures.First();
// Get the layer associated with this set of results.
EncLayer containingLayer = (EncLayer)firstResult.LayerContent;
// Get the first identified ENC feature.
EncFeature smallestFeature = (EncFeature)firstResult.GeoElements.OrderBy(f => GeometryEngine.Area(f.Geometry)).First();
// Select the feature.
containingLayer.SelectFeature(smallestFeature);
// Create the callout definition.
CalloutDefinition definition = new CalloutDefinition(smallestFeature.Acronym, smallestFeature.Description);
// Show the callout.
_myMapView.ShowCalloutAt(e.Location, definition);
}
catch (Exception ex)
{
new UIAlertView("Error", ex.ToString(), (IUIAlertViewDelegate)null, "OK", null).Show();
}
}
//renderResult.Miscellaneous.Add(Diamond14Attributes.LevelSetting, productDialog.LevelSetting);
//renderResult.Miscellaneous.Add(Diamond14Attributes.ProductType, productDialog.Type);
public GraphicsLayer Generate(RenderResult renderResult)
{
if (renderResult == null || renderResult.Miscellaneous == null || !renderResult.Miscellaneous.Keys.Contains(Diamond14Attributes.LevelSetting))
{
throw new Exception("找不到颜色配置");
}
if (string.IsNullOrEmpty(renderResult.Miscellaneous[Diamond14Attributes.LevelSetting].ToString()))
{
throw new ArgumentNullException("无效的颜色配置");
}
var sourceLayer = renderResult.Layer;
var settings = LevelValueManager.Settings[renderResult.Miscellaneous[Diamond14Attributes.LevelSetting].ToString()];
var layer = new GraphicsLayer
{
DisplayName = sourceLayer.DisplayName
};
//layer.Opacity = 0.5;
var dict = new SortedDictionary <double, Graphic>();
foreach (var graphic in sourceLayer.Graphics)
{
if (graphic.Geometry is MapPoint)
{
graphic.ZIndex = 5;
layer.Graphics.Add(graphic);
}
if (graphic.Geometry is Polyline)
{
// Level value will be int. If null, value will be 0
int value = Convert.ToInt32(graphic.Attributes[Diamond14Attributes.LineValue]);
var polyline = graphic.Geometry as Polyline;
var polygon = ToPolygon(polyline);
var polygonSymbol = new SimpleFillSymbol
{
//Color = Color.FromArgb(0x66, 0xff, 0, 0)
Color = settings.GetValueColor(value)
};
var newGraphic = new Graphic
{
Geometry = polygon,
Symbol = polygonSymbol
};
layer.Graphics.Add(newGraphic);
//double area = GeometryEngine.Area(polygon); clock wise will be positive
double area = Math.Abs(GeometryEngine.Area(polygon));
dict.Add(area, newGraphic);
}
}
int zindex = dict.Keys.Count;
foreach (var graphic in dict.Values)
{
graphic.ZIndex = zindex--;
}
return(layer);
}