Windows Phone中Map控件由浅及深

Tags: windowsphone

 

Map控件,是基于Microsoft的Bing map的地图控件,在WP7能很好的使用bing map实现地图的呈现,缩放,标注和定位等功能。

首先,介绍一下Map控件的简单应用吧。

在使用Map控件之前,我们必须先注册地图获得一个Register Key才能够使用bing map,注册地址:https://www.bingmapsportal.com 。新建一个Sliverlight for Windows Phone的工程,就可以开始练习使用Map控件了。在xaml里添加一个地图控件

在.cs文件里添加register key的代码(或者不使用Binding直接写在xaml中也行)

 

<Grid x:Name="ContentPanel" Grid.Row="1" Margin="12,0,12,0"> 

     <my:Map Height="623" HorizontalAlignment="Left"

                    CredentialsProvider="{Binding CredentialsProvider}"

                    Margin="12,-22,0,0" Name="map1"

 

                    VerticalAlignment="Top" Width="425"/>

</Grid>

 

 

note:应该添加一个namespace:

 1 using Microsoft.Phone.Controls.Maps;

 2

 3 namespace MapExample

 4 {

 5       public partial class MainPage : PhoneApplicationPage

 6      {

 7           const String BingMapsId = "Al7xKT8k0tvRNSCTc0uQs6AM1k-gREOdyigcbbbL4z932ynL42ySQuht1Ur6hpLI";

 8           private readonly CredentialsProvider credentialsProvider = new ApplicationIdCredentialsProvider(BingMapsId);

 9           public CredentialsProvider CredentialsProvider

10           {

11                get { return credentialsProvider; }

12           }

13           // Constructor

14           public MainPage()

15           {

16               InitializeComponent();

17            }

18       }

19 }

 

 

这样就可以运行一个最基本的map控件了。

下面,我们看看如何设置map的中心点以及Zoomlevel以及显示模式。

这个很简单只需要改变Center、Zoomlevel和Map.Mode这几个属性的值,同样可以在xaml直接设置,或者在.cs文件里设置,当然,更高级点的用法就是对Center,zoomlevel等进行Binding了。

Map控件还有很多其他的属性,比如ZoomBarVisibility,ScaleVisibility,LogoVisibility等,这些都可以简单的进行设置或者通过Binding技术实现动态的属性值的改变。

然而,Map控件还提供添加标注,添加图片,绘制多边形,多边线等功能。

下面讲讲如何添加一个标记吧。

首先,我们可以在MainPage()里建立并初始化一个标记( 记得添加namespace:using System.Device.Location; )

1 Pushpin pin = new Pushpin();

2 pin.Location = new GeoCoordinate(30, 120);

3 pin.Background = new SolidColorBrush(Colors.Black);

4 pin.Content = "Example";

5 pin.Height = 40;

6 pin.Width = 80;

7 map1.Children.Add(pin);   //  一定要记得添加到map1这个控件中哦~

 

 

对于多边线,我们用到的是Polyline这样一个类,多边形的绘制使用Polygon这个类,插入图片使用MapLayer类,它们的使用跟Pushpin这个类异曲同工。

以上就是一些简单的应用,那么来点实际点的。

我在开发过程中需要使用Map控件实现动态定位,找到自己的所在位置以及某个会议要举行的位置,并在切换过程中在地图中标注出相应的位置,并支持WP7.1的多点触控进行Zoomin和Zoomout。

这需要写一个page,我把它叫做MapPage,然后它的入口接收在页面Navigate时候传过来的三个值,一个是会议举行地点的经度,一个是纬度,还有一个是label,显示在标注上的文字。下面给出源代码仅供参考。

创建一个MapPage,xaml文件如下:

<phone:PhoneApplicationPage x:Class="Client.MapPage"

    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

    xmlns:phone="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone"

    xmlns:shell="clr-namespace:Microsoft.Phone.Shell;assembly=Microsoft.Phone"

    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"

    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"   

    xmlns:System="clr-namespace:System;assembly=mscorlib"

    FontFamily="{StaticResource PhoneFontFamilyNormal}"

    FontSize="{StaticResource PhoneFontSizeNormal}"

    Foreground="{StaticResource MyPhoneForegroundBrush}"

    SupportedOrientations="Portrait" Orientation="Portrait"

    mc:Ignorable="d" d:DesignWidth="480" d:DesignHeight="728"

    shell:SystemTray.IsVisible="False"

    xmlns:my="clr-namespace:Microsoft.Phone.Controls.Maps;assembly=Microsoft.Phone.Controls.Maps"

    >

 

    <Canvas x:Name="LayoutRoot">

 

        <!-- Map View -->

        <Border x:Name="Mapw"

                Height="768" Width="480">

            <my:Map Name="Map"

                    CredentialsProvider="{Binding CredentialsProvider}"

                    CopyrightVisibility="Collapsed"

                    LogoVisibility="Collapsed"

                    ZoomLevel="{Binding Zoom, Mode=TwoWay}"

                    Center="{Binding Center, Mode=TwoWay}"

                    >

                <my:Map.Mode>

                    <my:RoadMode />

                </my:Map.Mode>

 

                <my:MapItemsControl x:Name="mapControl"/>

            </my:Map>

 

            <!-- TODO : Add map control -->

 

        </Border>

 

    </Canvas>

 

    <phone:PhoneApplicationPage.ApplicationBar>

        <shell:ApplicationBar IsVisible="True" IsMenuEnabled="False">

            <shell:ApplicationBarIconButton IconUri="/Images/appbar.location.rest.png" Text="current" Click="CurrentLocation_Click"/>

            <shell:ApplicationBarIconButton IconUri="/Images/appbar.next.rest.png" Text="venue" Click="VenueLocation_Click"/>

        </shell:ApplicationBar>

    </phone:PhoneApplicationPage.ApplicationBar>

 

 

</phone:PhoneApplicationPage>

 

在MapPage.cs文件里完成相应的处理:

using System;

using System.Collections.Generic;

using System.Linq;

using System.Net;

using System.Windows;

using System.Windows.Controls;

using System.Windows.Documents;

using System.Windows.Input;

using System.Windows.Media;

using System.Windows.Media.Animation;

using System.Windows.Shapes;

using Microsoft.Phone.Controls;

using Microsoft.Phone.Controls.Maps;

using System.Device.Location;

using System.ComponentModel;

using Microsoft.Phone.Controls.Maps.Core;

 

namespace Client

{

    public partial class MapPage : PhoneApplicationPage, INotifyPropertyChanged

    {

        public MapPage()

        {

            this.Loaded += new RoutedEventHandler(MapPage_Loaded);

            InitializeComponent();

            InitializeDefaults();

 

            DataContext = this;

        }

 

        private readonly CredentialsProvider credentialsProvider = new ApplicationIdCredentialsProvider(AcademicSearch.App.BingMapsId);          

        public CredentialsProvider CredentialsProvider

        {

            get { return credentialsProvider; }

        }

 

        private MapLayer pushpinLayer;

        private string pushpinLabel;

        private Pushpin locationMark;

        void MapPage_Loaded(object sender, RoutedEventArgs e)

        {

            NotifyPropertyChanged("Zoom");

            NotifyPropertyChanged("Center");

            pushpinLayer = new MapLayer();

            Map.Children.Add(pushpinLayer);

            pushpinLayer.AddChild(

                new Pushpin() {Content =new Border() { Child = new TextBlock() { Text = pushpinLabel },

                            Background=new SolidColorBrush(Colors.Black)}},

                Center);

                locationMark = new Pushpin() { Content = new Border() { Child = new TextBlock() { Text = "You Are Here!" },

                            Background = new SolidColorBrush(Colors.Black) } };

            pushpinLayer.AddChild(locationMark, new GeoCoordinate(0, 0));

        }

 

        protected override void OnNavigatedTo(System.Windows.Navigation.NavigationEventArgs e)

        {

            base.OnNavigatedTo(e);

            string longitudeStr;

            string latitudeStr;

            if (NavigationContext.QueryString.TryGetValue("longitude", out longitudeStr) && NavigationContext.QueryString.TryGetValue("latitude", out latitudeStr))

            {

                double latitude;

                double longitude;

                if (Double.TryParse(latitudeStr, out latitude) && Double.TryParse(longitudeStr, out longitude))

                {

                    Center = new GeoCoordinate(latitude, longitude);

                    Venue = new GeoCoordinate(latitude, longitude);

                    Zoom = DefaultZoomLevel;

                }

                string label;

                if (NavigationContext.QueryString.TryGetValue("label", out label))

                {

                    pushpinLabel = label;

                }

                else

                {

                    pushpinLabel = "";

                }

            }

        }

 

        public void AddPushpin(GeoCoordinate location)

        {

            Pushpin pushpin = new Pushpin();

            pushpin.Content = "Test";

            pushpinLayer.AddChild(pushpin, location);

        }

 

        ///<summary>

        /// Gets or sets the map zoom level.

        ///</summary>

        private const double DefaultZoomLevel = 17.0;

        private const double MaxZoomLevel = 21.0;

        private const double MinZoomLevel = 1.0;

 

        private double _zoom = DefaultZoomLevel;

        public double Zoom

        {

            get { return _zoom; }

            set

            {

                var coercedZoom = Math.Max(MinZoomLevel, Math.Min(MaxZoomLevel, value));

                if (_zoom != coercedZoom)

                {

                    _zoom = value;

                    NotifyPropertyChanged("Zoom");

                }

            }

        }

 

        private GeoCoordinateWatcher loc = null;

 

        private void CurrentLocation_Click(object sender, EventArgs e)

        {

            //Zoom += 1;

            if (loc == null)

            {

                loc = new GeoCoordinateWatcher(GeoPositionAccuracy.Default);

                loc.StatusChanged += loc_StatusChanged;

            }

            if (loc.Status == GeoPositionStatus.Disabled)

            {

                loc.StatusChanged -= loc_StatusChanged;

                MessageBox.Show("Location services must be enabled on your phone.");

                return;

            }

            loc.Start();

        }

 

        void loc_StatusChanged(object sender, GeoPositionStatusChangedEventArgs e)

        {

 

            if (e.Status == GeoPositionStatus.Ready)

            {

                locationMark.Location = loc.Position.Location;

                Map.SetView(loc.Position.Location, 17.0);

                loc.Stop();

            }

        }

 

        private void VenueLocation_Click(object sender, EventArgs e)

        {

            Map.SetView(Venue, 17.0);

        }

 

        private GeoCoordinate _center;

        public GeoCoordinate Center

        {

            get { return _center; }

            set

            {

                if (_center != value)

                {

                    _center = value;

                    NotifyPropertyChanged("Center");

                }

            }

        }

 

        private GeoCoordinate Venue;

 

        public event PropertyChangedEventHandler PropertyChanged;

        private void NotifyPropertyChanged(String propertyName)

        {

            PropertyChangedEventHandler handler = PropertyChanged;

            if (null != handler)

            {

                handler(this, new PropertyChangedEventArgs(propertyName));

            }

        }

 

        public bool HasDirections

        {

            get

            {

                // TODO : Return true only if has directions.

 

                return true;

            }

        }

 

 

        #region Tasks

 

        private void InitializeDefaults()

        {

            // TODO : Initialize default properties.

        }

 

        private void ChangeMapMode()

        {

            // TODO : Change map view mode.

        }

 

        private void IncreaseZoomLevel()

        {

            // TODO : Increases zoom level.

        }

 

        private void DecreaseZoomLevel()

        {

            // TODO : Decreases zoom level.

        }

 

        private void CenterLocation()

        {

            // TODO : Center current location.

        }

 

        private void CenterPushpinsPopup(Point touchPoint)

        {

            // TODO : Center pushpins popup to the touch point.

        }

 

        private void CreateNewPushpin(object selectedItem, Point point)

        {

            // TODO : Create a new pushpin.

        }

 

        private void CalculateRoute()

        {

            // TODO : Calculate a route.

        }       

 

        #endregion

 

    }

}

 

 

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摘自 OMG!日志

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