ArcGIS API for Silverlight实现地图测距功能

来源：互联网发布：济南舜文中淘宝节编辑：程序博客网时间：2024/05/29 18:36

问题：如何实现地图测距功能？

地图工具栏

 <Grid x:Name="gToolMenu"  Height="100" VerticalAlignment="Top" Opacity="0.8" HorizontalAlignment="Right" Width="467">            <Rectangle Fill="#22919191" RadiusX="10" RadiusY="10" Margin="0,0,0,6" >                <Rectangle.Effect>                    <DropShadowEffect/>                </Rectangle.Effect>            </Rectangle>            <Rectangle Fill="#CCFFFFFF" Stroke="DarkGray" RadiusX="5" RadiusY="5" Margin="5,10,5,10" />            <StackPanel Orientation="Vertical">                <esri:Toolbar x:Name="MyToolbar" MaxItemHeight="80" MaxItemWidth="80"                    VerticalAlignment="Top" HorizontalAlignment="Center"                    Loaded="MyToolbar_Loaded"                    ToolbarItemClicked="MyToolbar_ToolbarItemClicked"                     Width="458" Height="80">                    <esri:Toolbar.Items>                        <esri:ToolbarItemCollection>                            <esri:ToolbarItem Text="Zoom In">                                <esri:ToolbarItem.Content>                                    <Image Source="Images/i_zoomin.png" Stretch="Uniform" Margin="5" />                                </esri:ToolbarItem.Content>                            </esri:ToolbarItem>                            <esri:ToolbarItem Text="Zoom Out">                                <esri:ToolbarItem.Content>                                    <Image Source="Images/i_zoomout.png" Stretch="Uniform" Margin="5" />                                </esri:ToolbarItem.Content>                            </esri:ToolbarItem>                            <esri:ToolbarItem Text="Pan">                                <esri:ToolbarItem.Content>                                    <Image Source="Images/i_pan.png" Stretch="Uniform" Margin="5" />                                </esri:ToolbarItem.Content>                            </esri:ToolbarItem>                            <esri:ToolbarItem Text="Measure Length">                                <esri:ToolbarItem.Content>                                    <Image Source="Images/i_measure.png" Margin="5">                                        <i:Interaction.Triggers>                                            <i:EventTrigger EventName="MouseLeftButtonDown">                                                <esri:MeasureAction TargetName="myMap" AreaUnit="SquareMeters"  MeasureMode="Polyline" DistanceUnit="Kilometers"   FillSymbol="{StaticResource DefaultFillSymbol}"  DisplayTotals="True" MapUnits="Kilometers"/>                                            </i:EventTrigger>                                        </i:Interaction.Triggers>                                    </Image>                                </esri:ToolbarItem.Content>                            </esri:ToolbarItem>                            <esri:ToolbarItem Text="Previous Extent" >                                <esri:ToolbarItem.Content>                                    <Image Source="Images/i_previous.png" IsHitTestVisible="False" Opacity="0.3" Stretch="Uniform" Margin="5"/>                                </esri:ToolbarItem.Content>                            </esri:ToolbarItem>                            <esri:ToolbarItem Text="Next Extent">                                <esri:ToolbarItem.Content>                                    <Image Source="Images/i_next.png" IsHitTestVisible="False" Opacity="0.3" Stretch="Uniform" Margin="5"/>                                </esri:ToolbarItem.Content>                            </esri:ToolbarItem>                            <esri:ToolbarItem Text="Full Extent">                                <esri:ToolbarItem.Content>                                    <Image Source="Images/i_globe.png" Stretch="Uniform" Margin="5" />                                </esri:ToolbarItem.Content>                            </esri:ToolbarItem>                            <esri:ToolbarItem Text="Full Screen">                                <esri:ToolbarItem.Content>                                    <Image Source="Images/i_widget.png" Stretch="Uniform" Margin="5" />                                </esri:ToolbarItem.Content>                            </esri:ToolbarItem>                        </esri:ToolbarItemCollection>                    </esri:Toolbar.Items>                </esri:Toolbar>            </StackPanel>        </Grid>

上面是工具栏代码，测距的xaml代码从中抽取如下：

 <esri:ToolbarItem Text="Measure Length">     <esri:ToolbarItem.Content>               <Image Source="Images/i_measure.png" Margin="5">                       <i:Interaction.Triggers>                               <i:EventTrigger EventName="MouseLeftButtonDown">                                      <esri:MeasureAction TargetName="myMap" AreaUnit="SquareMeters"  MeasureMode="Polyline" DistanceUnit="Kilometers"   FillSymbol="{StaticResource DefaultFillSymbol}"  DisplayTotals="True" MapUnits="Kilometers"/>                              </i:EventTrigger>                        </i:Interaction.Triggers>               </Image>     </esri:ToolbarItem.Content> </esri:ToolbarItem>

代码分析：

为图片Image添加Triggers,监听Image的鼠标左键按下事件，然后执行MeasureAction，目标是myMap地图，测量方式是Polyline，单位是千米（Kilometers），符号使用的是一个静态资源。

<esri:ToolbarItem Text="Measure Length">
<esri:ToolbarItem.Content>
<Image Source="Images/i_measure.png" Margin="5">
<i:Interaction.Triggers>
<i:EventTrigger EventName="MouseLeftButtonDown">
<esri:MeasureAction TargetName="myMap" AreaUnit="SquareMeters" MeasureMode="Polyline" DistanceUnit="Kilometers" FillSymbol="{StaticResource DefaultFillSymbol}"
DisplayTotals="True" MapUnits="Kilometers"/>
</i:EventTrigger>
</i:Interaction.Triggers>
</Image>
</esri:ToolbarItem.Content>
</esri:ToolbarItem>

当按下测距按钮时，可以在地图上画线测距了，效果如下图：

注：其它要注意引用的地方

xmlns:esri="http://schemas.esri.com/arcgis/client/2009"
xmlns:i="clr-namespace:System.Windows.Interactivity;assembly=System.Windows.Interactivity"

<Grid.Resources>

<esri:SimpleFillSymbol x:Key="DefaultFillSymbol" BorderBrush="Red" BorderThickness="1"/>
</Grid.Resources>

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