Arcgis For Silverlight 绘图工具 Draw
作者：互联网
创建一个Silverlight工程，在默认的MainPage.xaml(2.0时是叫Page.xaml)里,编写代码如下：
<UserControl x:Class="SilverlightApplication3.MainPage"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d" d:DesignWidth="640" d:DesignHeight="480"
xmlns:sysmbol="clr-namespace:ESRI.ArcGIS.Client.Symbols;assembly=ESRI.ArcGIS.Client"
xmlns:esri="clr-namespace:ESRI.ArcGIS.Client;assembly=ESRI.ArcGIS.Client">
<Grid x:Name="LayoutRoot">
<!--地图控件-->
<esri:Map x:Name="MyMap">
<esri:Map.Layers>
<!--添加一个底图-->
<esri:ArcGISTiledMapServiceLayer
Url="http://server.arcgisonline.com/ArcGIS/rest/services/ESRI_Imagery_World_2D/MapServer"/>
<!--添加一个绘画图层-->
<esri:GraphicsLayer ID="MyGraphicsLayer"/>
</esri:Map.Layers>
</esri:Map>
<!--END:地图控件-->
<!--工具栏-->
<Canvas VerticalAlignment="Top" Width="215" Height="50"
HorizontalAlignment="Left" Margin="20,20,0,0">
<!--工具栏边框效果-->
<Rectangle RadiusX="10" RadiusY="10"
Fill="#22000000" Canvas.Left="5" Canvas.Top="5"
Width="215" Height="50"/>
<Rectangle RadiusX="10" RadiusY="10"
Fill="#775c90b2" Canvas.Left="0" Canvas.Top="0"
Width="215" Height="50" Stroke="Gray"/>
<Rectangle RadiusX="5" RadiusY="5"
Fill="#FFFFFFFF" Canvas.Left="10" Canvas.Top="10"
Width="195" Height="30" Stroke="DarkGreen"/>
<!--工具-->
<StackPanel Canvas.Left="12" Canvas.Top="12" Orientation="Horizontal">
<Button Content="点" Height="25" Width="25" Click="Button_Click"/>
<Button Content="线" Height="25" Width="25" Click="Button_Click"/>
<Button Content="框" Height="25" Width="25" Click="Button_Click"/>
<Button Content="面" Height="25" Width="25" Click="Button_Click"/>
<Button Content="任意" Height="25" Width="30" Click="Button_Click"/>
<Button Content="取消" Height="25" Width="30" Click="Button_Click"/>
<Button Content="清空" Height="25" Width="30" Click="Button_Click"/>
</StackPanel>
</Canvas>
<!--END:工具栏-->
</Grid>
</UserControl>
绘画要用到一个很重新的类：ESRI.ArcGIS.Client.Draw，它提供了画图的方式。因为这里的几个工具都要用到它，所有我们把它声明为一个全局变量。另外，我们在Map里添加了一个名为MyGraphicsLayer的GraphicsLayer，它是把画的图形显示出来的图层。以下的代码都是在MainPage.xaml.cs文件里添加.
/// <summary>
/// 全局变量:绘图用
/// </summary>
private Draw draw;
/// <summary>
/// 全局变量:绘图层
/// </summary>
private GraphicsLayer gra;
在初始化函数里，初始化全局变量。这里需要说明的是：Draw的属性中LineSymbol是画线，任意线时所用到的临时符号，FillSymbol则是画框、面时所用到的临时符号。事件DrawComplete固名思义就知道是完成绘制所触发的事件。
public MainPage()
{
InitializeComponent();
//初始化变量
gra = this.MyMap.Layers["MyGraphicsLayer"] as GraphicsLayer;
draw = new Draw(this.MyMap)
{
LineSymbol = new LineSymbol()
{
Color = new SolidColorBrush(Colors.Red), Width = 2
},
FillSymbol=new SimpleFillSymbol()
{
BorderBrush = new SolidColorBrush(Colors.Red) { },
BorderThickness = 2,
Fill = new SolidColorBrush(Colors.Green) { Opacity = 0.5 }
},
};
//注册事件
draw.DrawComplete += new EventHandler<DrawEventArgs>(draw_DrawComplete);
}
添加DrawComplete事件函数。我们需要在该函数里把所绘制的图形保存在GraphicsLayer里，才能起到显示的效果。Graphic的属性Symbol是显示出来的符号类型，我们根据不同几何形状选择相应的符号。
/// <summary>
/// 绘画完成后,显示出来
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void draw_DrawComplete(object sender, DrawEventArgs e)
{
gra.Graphics.Add(
new Graphic() { Geometry=e.Geometry, Symbol=GetSymbol(e.Geometry,Colors.Blue) });
}
/// <summary>
/// 根据几何要素取得对应的渲染符号
/// </summary>
/// <param name="ge"></param>
/// <returns></returns>
public Symbol GetSymbol(ESRI.ArcGIS.Client.Geometry.Geometry ge, Color color)
{
if (ge is MapPoint)
return new SimpleMarkerSymbol()
{ Color = new SolidColorBrush(color), Size = 10,
Style = ESRI.ArcGIS.Client.Symbols.SimpleMarkerSymbol.SimpleMarkerStyle.Circle
};
else if (ge is ESRI.ArcGIS.Client.Geometry.Polyline)
return new LineSymbol()
{ Color = new SolidColorBrush(color), Width = 3 };
else if (ge is ESRI.ArcGIS.Client.Geometry.Polygon
|| ge is ESRI.ArcGIS.Client.Geometry.Envelope)
{
Symbol MySm = new SimpleFillSymbol()
{
BorderBrush = new SolidColorBrush(color) { },
BorderThickness = 3,
Fill = new SolidColorBrush(Colors.Green) { Opacity = 0.5 }
};
return MySm;
}
return null;
}
最后就是完成在XAML文件里注册的工具事件函数。需要说明的是：Draw的属性DrawMode即是画图的类型。
/// <summary>
/// 工具按钮按下后
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void Button_Click(object sender, RoutedEventArgs e)
{
Button button = sender as Button;
string modetype = button.Content.ToString();
//设置绘画的方式
switch(modetype)
{
case "点":
draw.DrawMode = DrawMode.Point;
break;
case "线":
draw.DrawMode = DrawMode.Polyline;
break;
case "面":
draw.DrawMode = DrawMode.Polygon;
break;
case "框":
draw.DrawMode = DrawMode.Rectangle;
break;
case "任意":
draw.DrawMode = DrawMode.Freehand;
break;
case "取消":
draw.DrawMode = DrawMode.None;
break;
case "清空":
gra.Graphics.Clear();
return;
}
//激活工具
draw.IsEnabled = true;
}
编译运行。OK！接下来几节会在这个基础之上，实现放大缩小，点选、框选等功能。
标签：case,draw,Geometry,Draw,Silverlight,SolidColorBrush,Arcgis,new,DrawMode 来源： https://www.cnblogs.com/devgis/p/16524738.html