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//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//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： <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>
  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

graphicsLayer11.Graphics.Add(graphicText);