ArcGIS API for Silverlight 之ElementLayer使用及TextSymbol的模板使用



   

在开发中动态在地图上添加文字信息，可以使用TextSymbol添加文字

[csharp] view plaincopyprint?

1. //动态添加文本  
2. TextSymbol textSymbol = new TextSymbol()  
3. {  
4.         FontFamily = new System.Windows.Media.FontFamily("Microsoft YaHei"),  
5.         Foreground = new System.Windows.Media.SolidColorBrush(Color.FromArgb(255, 255, 0, 0)),  
6.         FontSize = 14,  
7.         Text = item.ZDMC,  
8.         OffsetX = 12,  
9.         OffsetY = -5  
10. };  
11.   
12. Graphic graphicText1 = new Graphic()  
13. {  
14.          Geometry = mercator.FromGeographic(new MapPoint(double.Parse(item.Latitute.ToString().Trim(), System.Globalization.CultureInfo.InvariantCulture), double.Parse(item.Longitute.ToString().Trim(), System.Globalization.CultureInfo.InvariantCulture))),  
15.          Symbol = textSymbol  
16. };  
17.   
18. graphicText1.Attributes["TextYLZMC"] = item.ZDMC;  
19. graphicsLayer1.Graphics.Add(graphicText1);  

//动态添加文本TextSymbol textSymbol = new TextSymbol(){        FontFamily = new System.Windows.Media.FontFamily("Microsoft YaHei"),        Foreground = new System.Windows.Media.SolidColorBrush(Color.FromArgb(255, 255, 0, 0)),        FontSize = 14,        Text = item.ZDMC,        OffsetX = 12,        OffsetY = -5};Graphic graphicText1 = new Graphic(){         Geometry = mercator.FromGeographic(new MapPoint(double.Parse(item.Latitute.ToString().Trim(), System.Globalization.CultureInfo.InvariantCulture), double.Parse(item.Longitute.ToString().Trim(), System.Globalization.CultureInfo.InvariantCulture))),         Symbol = textSymbol};graphicText1.Attributes["TextYLZMC"] = item.ZDMC;graphicsLayer1.Graphics.Add(graphicText1);

 

如果要考虑给文字加背景颜色的话，该类就无法起作用了

[csharp] view plaincopyprint?

1. //动态添加带背景颜色的文字信息  
2.  Border b = new Border();  
3.  b.Background = new SolidColorBrush(Colors.Blue);  
4.  b.Height = 20;  
5.  b.CornerRadius = new CornerRadius(5);  
6.  TextBlock tb = new TextBlock();  
7.  tb.Text = item.ZDMC;  
8.  tb.Foreground = new SolidColorBrush(Colors.White);  
9.  tb.HorizontalAlignment = HorizontalAlignment.Center;  
10.  tb.FontSize = 15;  
11.  b.Child = tb;  
12.   
13.  ElementLayer.SetEnvelope(b, new Envelope(new MapPoint(double.Parse(item.Latitute.ToString().Trim(), System.Globalization.CultureInfo.InvariantCulture), double.Parse(item.Longitute.ToString().Trim(), System.Globalization.CultureInfo.InvariantCulture))),new MapPoint(double.Parse(item.Latitute.ToString().Trim(), System.Globalization.CultureInfo.InvariantCulture), double.Parse(item.Longitute.ToString().Trim(), System.Globalization.CultureInfo.InvariantCulture))));  
14.  elementLayer.Children.Add(b);  

//动态添加带背景颜色的文字信息 Border b = new Border(); b.Background = new SolidColorBrush(Colors.Blue); b.Height = 20; b.CornerRadius = new CornerRadius(5); TextBlock tb = new TextBlock(); tb.Text = item.ZDMC; tb.Foreground = new SolidColorBrush(Colors.White); tb.HorizontalAlignment = HorizontalAlignment.Center; tb.FontSize = 15; b.Child = tb; ElementLayer.SetEnvelope(b, new Envelope(new MapPoint(double.Parse(item.Latitute.ToString().Trim(), System.Globalization.CultureInfo.InvariantCulture), double.Parse(item.Longitute.ToString().Trim(), System.Globalization.CultureInfo.InvariantCulture))),new MapPoint(double.Parse(item.Latitute.ToString().Trim(), System.Globalization.CultureInfo.InvariantCulture), double.Parse(item.Longitute.ToString().Trim(), System.Globalization.CultureInfo.InvariantCulture)))); elementLayer.Children.Add(b);

效果如下

 

提供第二种方法，使用TextSymbol的模板使用：

[csharp] view plaincopyprint?

1. <esri:TextSymbol x:Key="SWZTextSymbol">  
2.       <esri:TextSymbol.ControlTemplate>  
3.           <ControlTemplate>  
4.               <Border Background="White" BorderBrush="Black" CornerRadius="5"  BorderThickness="1,1,1,1">  
5.                   <TextBlock  
6.                       Width="70"  
7.                       FontSize="14"   
8.                       Text="{Binding Attributes[TextSWZMC]}" //注意这里的TextSWZMC，和后台代码中要一致  
9.                       Foreground="Blue"  
10.                       FontFamily="Microsoft YaHei"  
11.                       HorizontalAlignment="Center" />  
12.               </Border>  
13.           </ControlTemplate>  
14.       </esri:TextSymbol.ControlTemplate>  
15.   </esri:TextSymbol>  

          <esri:TextSymbol x:Key="SWZTextSymbol">                <esri:TextSymbol.ControlTemplate>                    <ControlTemplate>                        <Border Background="White" BorderBrush="Black" CornerRadius="5"  BorderThickness="1,1,1,1">                            <TextBlock                                Width="70"                                FontSize="14"                                 Text="{Binding Attributes[TextSWZMC]}" //注意这里的TextSWZMC，和后台代码中要一致                                Foreground="Blue"                                FontFamily="Microsoft YaHei"                                HorizontalAlignment="Center" />                        </Border>                    </ControlTemplate>                </esri:TextSymbol.ControlTemplate>            </esri:TextSymbol>

 

[csharp] view plaincopyprint?

1. TextSymbol textSymbol = LayoutRoot.Resources["SWZTextSymbol"] as TextSymbol; //这里和模板的Key名称要一致  
2. textSymbol.OffsetX = 15;  
3. textSymbol.OffsetY = -15;  
4.   
5. Graphic graphicText = new Graphic()  
6.  {  
7.        Geometry = mercator.FromGeographic(new MapPoint(double.Parse(item.Latitute.ToString().Trim(), System.Globalization.CultureInfo.InvariantCulture), double.Parse(item.Longitute.ToString().Trim(), System.Globalization.CultureInfo.InvariantCulture))),  
8.        Symbol = textSymbol  
9.  };  
10.  graphicText.Attributes["TextSWZMC"] = item.ZDMC; //注意这里的TextSWZMC，和前台xaml代码中要一致  

  TextSymbol textSymbol = LayoutRoot.Resources["SWZTextSymbol"] as TextSymbol; //这里和模板的Key名称要一致  textSymbol.OffsetX = 15;  textSymbol.OffsetY = -15;  Graphic graphicText = new Graphic()   {         Geometry = mercator.FromGeographic(new MapPoint(double.Parse(item.Latitute.ToString().Trim(), System.Globalization.CultureInfo.InvariantCulture), double.Parse(item.Longitute.ToString().Trim(), System.Globalization.CultureInfo.InvariantCulture))),         Symbol = textSymbol   };   graphicText.Attributes["TextSWZMC"] = item.ZDMC; //注意这里的TextSWZMC，和前台xaml代码中要一致

[csharp] view plaincopyprint?

1. graphicsLayer11.Graphics.Add(graphicText);  

   graphicsLayer11.Graphics.Add(graphicText);