ArcGIS Runtime WPF SDK （3） 小试身手

本节代码
在上一节中，了解了，WPF API的各个命名空间的作用，本节内容包括，创建一个地图，加载一个要素图层，并支持点选查询。
效果如下：
底图

var myMap = new Map(Basemap.CreateTopographic());

要素图层

// Create Uri for the feature service Uri featureServiceUri = new Uri( "http://sampleserver6.arcgisonl ... 6quot;);

// Initialize feature table using a url to feature server url

var featureTable = new ServiceFeatureTable(featureServiceUri);

// Initialize a new feature layer based on the feature table

_featureLayer = new FeatureLayer(featureTable);

await _featureLayer.LoadAsync();

// Check for the load status. If the layer is loaded then add it to map if (_featureLayer.LoadStatus == LoadStatus.Loaded) { // Add the feature layer to the map myMap.OperationalLayers.Add(_featureLayer);

}

支持点选

// Set the selection color for feature layer

_featureLayer.SelectionColor = Colors.Cyan;

// Set the selection width

_featureLayer.SelectionWidth = 3;

// Add tap event handler for mapview

MyMapView.GeoViewTapped += OnMapViewTapped;



 pivate async void OnMapViewTapped(object sender, GeoViewInputEventArgs e)

 {

     try

     {

         // Define the selection tolerance (half the marker symbol size so that any click on the symbol will select the feature)

         double tolerance = 14;



         // Convert the tolerance to map units

         double mapTolerance = tolerance * MyMapView.UnitsPerPixel;



         // Define the envelope around the tap location for selecting features

         var selectionEnvelope = new Envelope(e.Location.X - mapTolerance, e.Location.Y - mapTolerance, e.Location.X + mapTolerance,

             e.Location.Y + mapTolerance, MyMapView.Map.SpatialReference);



         // Define the query parameters for selecting features

         var queryParams = new QueryParameters();



         // Set the geometry to selection envelope for selection by geometry

         queryParams.Geometry = selectionEnvelope;



         // Select the features based on query parameters defined above

         await _featureLayer.SelectFeaturesAsync(queryParams, Esri.ArcGISRuntime.Mapping.SelectionMode.New);

     }

     catch (Exception ex)

     {

         MessageBox.Show("Sample error", ex.ToString());

     }

 }

弹出窗
在xaml中加入

<Grid>

   <esri:MapView x:Name="MyMapView" />

    <Border Name="myPopup" Width="200" Height="100" Margin="0,0,100,200">

        <!--<Path x:Name="myPopupPath"> <Path.Data> <PathGeometry x:Name="myPopupPathGeometry" Figures="{Binding FiguresPopupPathGeometry}"/> </Path.Data> </Path>-->

        <TextBlock Background="White" Foreground="Blue">Test</TextBlock>

    </Border>

</Grid>

在cs中加入相应代码，控制popup位置，以及显示内容

bool hasResult = false;

foreach(var r in _queryResult)

{

    hasResult = true;

    Feature f = r as Feature;

    string attribute = "";

    foreach(var a in f.Attributes)

    {

        attribute = attribute + a.ToString() + "\n";

    }



    MapPoint p = f.Geometry as MapPoint;



    Point sp = MyMapView.LocationToScreen(p);

    TextBlock popupText = new TextBlock();

    popupText.Background = Brushes.LightBlue;

    popupText.Foreground = Brushes.Blue;

    popupText.Text = attribute;

    myPopup.Child = popupText;

    myPopup.Width = 200;

    myPopup.Height = 100;

    var b = MyMapView.Margin;



    myPopup.Margin = new Thickness(sp.X, sp.Y, MyMapView.ActualWidth - 200 - sp.X, MyMapView.ActualHeight - 100 - sp.Y);

}



if(!hasResult)

{

    myPopup.Width = myPopup.Height = 0;

}

使用ArcGIS Runtime WPF SDK （1）创建自己的地图应用程序：http://zhihu.esrichina.com.cn/article/3555 
ArcGIS Runtime WPF SDK （2）命名空间解析：http://zhihu.esrichina.com.cn/article/3556 
ArcGIS Runtime WPF SDK （3）小试身手：http://zhihu.esrichina.com.cn/article/3552 
ArcGIS Runtime WPF SDK （4）绘制，编辑Graphic：http://zhihu.esrichina.com.cn/article/3553

文章来源：http://blog.csdn.net/uninterrupted/article/details/78043397