Microsoft Virtual Earth Silverlight Map Control (CTP)快速上手

简介:

在MIX08上,Chris Pendlenton演示了一款Silverlight地图控件,给大家留下了深刻的印象。时隔一年,在MIX09上,微软终于发布了这款名叫“Virtual Earth Silverlight Map Control”的Silverlight控件技术预览版

Virtual Earth Silverlight Map Control将Virtual Earth融入了Silverlight,使开发者不必再去使用大量麻烦的Javascript API来开发Virtual Earth应用了。除此之外,它还具有以下优点:

    • 对数据和地图进行动画开发;
    • 可缩放的界面,包括将来的移动版
    • 深入整合视频、音频和图像,不仅仅是弹出层;
    • 支持自定义主题的地图控件;
    • 跨浏览器支持,不再需要考虑 CSS Hack 和跨浏览器的 JavaScript 问题。

这个控件的应用非常简单。下面我们就打开Visual Studio 2008,随便试试吧!

效果图:(围观链接:http://azuredrive.blob.core.windows.net/netdrive1/file_e31368a2-988b-4429-b75b-2eb865185c76.html  注:该控件是同时支持Silverlight 2.0和3.0的,但本例中我使用了3.0)

image 

第一步:打开VS2008,新建Silverlight项目。(2.0与3.0的Silverlight Tools均可)未命名1 未命名2

第二步:添加对Microsoft.VirtualEarth.MapControl.dll的引用。

Microsoft.VirtualEarth.MapControl.dll位于Virtual Earth Silverlight Map Control (CTP) SDK安装路径内。

未命名3

第三步:在Silverlight的MainPage.xaml(2.0中是Page.xaml)中插入地图控件。

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< UserControl  x:Class ="SilverlightApplication1.Page"
    xmlns
="http://schemas.microsoft.com/winfx/2006/xaml/presentation"  
    xmlns:x
="http://schemas.microsoft.com/winfx/2006/xaml"  
    xmlns:m
="clr-namespace:Microsoft.VirtualEarth.MapControl;assembly=Microsoft.VirtualEarth.MapControl" >
    
< Grid  x:Name ="LayoutRoot"  Background ="White" >
        
< m:Map />
    
</ Grid >
</ UserControl >
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如果你F5运行它的话,你已经可以看到Virtual Earth地图呈现在你的Silverlight项目里了。我们还要做更多。

第四步:拖入一些简单的控件。

image 

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< UserControl  x:Class ="SLLiveEarthControl.MainPage"
    xmlns
="http://schemas.microsoft.com/winfx/2006/xaml/presentation"  
    xmlns:x
="http://schemas.microsoft.com/winfx/2006/xaml"  
    xmlns:VirtualEarth
="clr-namespace:Microsoft.VirtualEarth.MapControl;assembly=Microsoft.VirtualEarth.MapControl"
    Width
="700"  Height ="500" >
    
< Grid  x:Name ="LayoutRoot"  Background ="White" >
        
< Grid.RowDefinitions >
            
< RowDefinition  Height ="*"   />
            
< RowDefinition  Height ="40"   />
            
< RowDefinition  Height ="40"   />
        
</ Grid.RowDefinitions >
        
< VirtualEarth:Map  x:Name ="viewMap"  Mode ="AerialWithLabels"   Grid.Column ="0"  Grid.Row ="0"  Grid.RowSpan ="3"  Padding ="5"
               View
="29.544,106.518,0.0000 14.0000 0.0000"   MouseDoubleClick ="MapWithImages_MouseDoubleClick"   />
        
< StackPanel  Orientation ="Horizontal"  Opacity ="0.7"  Grid.Column ="0"  Grid.Row ="1"  HorizontalAlignment ="Center" >
            
< Button  x:Name ="btnNorthAmerica"  Click ="ChangeMapView_Click"  Tag ="39.89341,116.33235,0.0000 14.0000 0.0000"
                     Margin
="5"  Height ="20"   >
                
< TextBlock > 北京 </ TextBlock >
            
</ Button >
            
< Button  x:Name ="btnChengdu"  Click ="ChangeMapView_Click"  Tag ="30.67,104.074,0.0000 14.0000 0.0000"  Margin ="5"  Height ="20"   >
                
< TextBlock > 成都 </ TextBlock >
            
</ Button >
            
< Button  x:Name ="btnShanghai"  Click ="ChangeMapView_Click"  Tag ="31.10,121.411,0.0000 13.0000 0.0000"  Margin ="5"  Height ="20"   >
                
< TextBlock > 上海 </ TextBlock >
            
</ Button >
            
< Button  x:Name ="btnVancouver"  Click ="ChangeMapView_Click"  Tag ="29.544,106.518,0.0000 14.0000 0.0000"  Margin ="5"  Height ="20"   >
                
< TextBlock > 重庆 </ TextBlock >
            
</ Button >


        
</ StackPanel >
        
< StackPanel  Orientation ="Horizontal"  Opacity ="0.9"  Grid.Column ="0"  Grid.Row ="2"  HorizontalAlignment ="Center" >
            
< TextBlock  Text ="双击地图可以添加图钉。               更改经纬度后可点击Fly to换位置. "  Padding ="5"  Foreground ="Red"    Width ="178" TextWrapping ="Wrap" />
            
< TextBlock  Text ="Latitude: "  Padding ="12"  Foreground ="Red"   />
            
< TextBox  x:Name ="txtLatitude"  Text =""   Height ="20"   />
            
< TextBlock  Text ="Longitude: "  Padding ="12"  Foreground ="Red"     />
            
< TextBox  x:Name ="txtLongitude"  Text =""    Height ="20"    />
            
< Button  x:Name ="btnFlyto"  Click ="btnFlyto_Click"  Foreground ="Red"   Margin ="5"  Height ="20"   >
                
< TextBlock > Fly to </ TextBlock >
            
</ Button >
        
</ StackPanel >
    
</ Grid >
</ UserControl >
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第五步:写后台代码。

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using  System;
using
 System.Windows;
using
 System.Windows.Controls;
using
 System.Globalization;
using
 Microsoft.VirtualEarth.MapControl;
using
 Microsoft.VirtualEarth.MapControl.Design;
using
 System.Windows.Media;
using
 System.Windows.Media.Imaging;


namespace
 SLLiveEarthControl
ExpandedBlockStart.gif
{
    
public partial class
 MainPage : UserControl
ExpandedSubBlockStart.gif    

         LocationConverter locConverter 
= new
 LocationConverter();
        
// Converts the Button's location Tag to a map view..

        MapViewSpecificationConverter viewConverter = new MapViewSpecificationConverter();
        
private MapLayer imageLayer = new
 MapLayer();

        
public
   MainPage()
ExpandedSubBlockStart.gif        
{
            InitializeComponent();
            viewMap.AddChild(imageLayer);
            viewMap.ViewChangeOnFrame 
+= new EventHandler<MapEventArgs>
(viewMap_ViewChangeOnFrame);
            viewMap.AnimationLevel 
=
 AnimationLevel.Full;
        }


        
private void viewMap_ViewChangeOnFrame(object sender, MapEventArgs e)
ExpandedSubBlockStart.gif        
{
            Map map 
= sender as
 Map;
            
if (map != null
)
ExpandedSubBlockStart.gif            
{
                MapViewSpecification mapViewSpec 
=
 map.View;

                
// 根据地图当前的状态动态改变txtLatitude和txtLongitude的值

                txtLatitude.Text = string.Format(CultureInfo.InvariantCulture, 
                    
"{0:F5}"
, mapViewSpec.Center.Latitude);
                txtLongitude.Text 
= string
.Format(CultureInfo.InvariantCulture, 
                    
"{0:F5}"
, mapViewSpec.Center.Longitude);
            }

        }


        
private void ChangeMapView_Click(object sender, RoutedEventArgs e)
ExpandedSubBlockStart.gif        
{
            viewMap.View 
=
 (MapViewSpecification)viewConverter.ConvertFrom(((Button)sender).Tag);
        }

        
private void MapWithImages_MouseDoubleClick(object sender, MapMouseEventArgs e)
ExpandedSubBlockStart.gif        
{
            e.Handled 
= true
;
            Location pinLocation 
=
  viewMap.ViewportPointToLocation(e.ViewportPoint);
            Image pin 
= new
 Image();
            Random r 
= new
 Random();
            pin.Source 
= new BitmapImage(new Uri(r.Next() % 2==0 ? "female.png" : "male.png"
, UriKind.RelativeOrAbsolute));
            pin.Stretch 
=
 Stretch.None;
            imageLayer.AddChild(pin, pinLocation, PositionMethod.BottomCenter);
        }


        
private void btnFlyto_Click(object sender, RoutedEventArgs e)
ExpandedSubBlockStart.gif        
{
            viewMap.View 
= new MapViewSpecification(new Location(Double.Parse(txtLatitude.Text), Double.Parse(txtLongitude.Text)), 14
);
        }

    }

}

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你可能已经注意到,我们在编程时已经完全脱离了Javascript;Virtual Earth在我们的手中,已经变得和TextBox,DataGrid一样,只是一个控制非常方便的控件了。 : )



本文转自 流牛木马 博客园博客,原文链接:http://www.cnblogs.com/azure/archive/2009/03/29/1424408.html,如需转载请自行联系原作者

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