private async void MyMapView_GeoViewTapped(object sender, Esri.ArcGISRuntime.UI.Controls.GeoViewInputEventArgs e)
{
// 既にフィーチャが選択状態の場合は、選択を解除する
foreach (EncLayer layer in _mainMapView.Map.OperationalLayers.OfType <EncLayer>())
{
layer.ClearSelection();
}
// コールアウトを非表示にする
_mainMapView.DismissCallout();
// マップ上をクリックした地点にあるフィーチャを取得する
IReadOnlyList <IdentifyLayerResult> results = await _mainMapView.IdentifyLayersAsync(e.Position, 10, false);
// 該当するフィーチャが無い場合
if (results.Count < 1)
{
return;
}
// 取得されたフィーチャが含まれるレイヤーのリストが返されるので、ENCレイヤーのみを取得する
IEnumerable <IdentifyLayerResult> encResults = results.Where(result => result.LayerContent is EncLayer);
IEnumerable <IdentifyLayerResult> encResultsWithFeatures = encResults.Where(result => result.GeoElements.Count > 0);
// ENCレイヤーのリストから最上位のレイヤーを取得する
IdentifyLayerResult firstResult = encResultsWithFeatures.First();
EncLayer containingLayer = firstResult.LayerContent as EncLayer;
// レイヤーに含まれるフィーチャ リストから最後のフィーチャを取得する
EncFeature firstFeature = firstResult.GeoElements.Last() as EncFeature;
// 取得したフィーチャを選択（ハイライト表示）する
containingLayer.SelectFeature(firstFeature);
// フィーチャの関連情報を取得を文字列に変換する
var attributes = new System.Text.StringBuilder();
attributes.AppendLine(firstFeature.Description);
if (firstFeature.Attributes.Count > 0)
{
// フィーチャの属性（key:属性のフィールド名、value:属性のフィールド値のペア）を取得する
foreach (var attribute in firstFeature.Attributes)
{
var fieldName = attribute.Key;
var fieldValue = attribute.Value;
attributes.AppendLine(fieldName + ": " + fieldValue);
}
attributes.AppendLine();
}
// ENCフィーチャの頭文字と関連情報を指定してコールアウトを作成する
CalloutDefinition definition = new CalloutDefinition(firstFeature.Acronym, attributes.ToString());
// コールアウトをマップ上でクリックした場所に表示する
_mainMapView.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();
}
}
private async void MyMapView_GeoViewTapped(object sender, Esri.ArcGISRuntime.Xamarin.Forms.GeoViewInputEventArgs e)
{
// First clear any existing selections
ClearAllSelections();
try
{
// Perform the identify operation.
IReadOnlyList <IdentifyLayerResult> results = await MyMapView.IdentifyLayersAsync(e.Position, 10, 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 first result with ENC features. (Depending on the data, there may be more than one IdentifyLayerResult that contains ENC features.)
IdentifyLayerResult firstResult = encResults.First();
// Get the layer associated with this set of results.
EncLayer containingLayer = (EncLayer)firstResult.LayerContent;
// Get the GeoElement identified in this layer.
EncFeature encFeature = (EncFeature)firstResult.GeoElements.First();
// Select the feature.
containingLayer.SelectFeature(encFeature);
// Create the callout definition.
CalloutDefinition definition = new CalloutDefinition(encFeature.Acronym, encFeature.Description);
// Show the callout.
MyMapView.ShowCalloutAt(e.Location, definition);
}
catch (Exception ex)
{
await Application.Current.MainPage.DisplayAlert("Error", ex.ToString(), "OK");
}
}
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();
// 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;
// Get the first identified ENC feature
EncFeature firstFeature = firstResult.GeoElements.First() as EncFeature;
// Select the feature
containingLayer.SelectFeature(firstFeature);
// Create the callout definition
CalloutDefinition definition = new CalloutDefinition(firstFeature.Acronym, firstFeature.Description);
// Show the callout
_myMapView.ShowCalloutAt(e.Location, definition);
}
