WPF使用GMap.net框架开发地图应用

GMap.NET有两个版本，分别是WinForm和WPF的版本，WinForm版本的教程很多。这次主要介绍的WPF版本的操作。

要下载GMap.NET请点击这里，这个最好下载下来，可以参考里面的Demo来学习。下载下来后，用visual studio打开SourceCode里面的sln文件。打开的时候可能需要让你下载什么东西，这个有点不记得了，但是关于数据库的那个应该不用下载。

1、导入dll

1-1、第一种方法
按照下图打开NuGet包管理器，然后输入Gmap.net进行搜索，点击想要安装的dll，然后选择项目，点击安装即可。

1-2、第二种方法
这种方法就是运行下载下来的源代码，然后再拷贝Debug下面生成的dll文件。这样的做法更加灵活，可以自己更改代码。

2、导入GMapControl控件

2-1、再工具箱空白处右键“选项”然后选中GMapControl，点击确定。即可在工具箱中使用GMapControl控件。

3、导入高德地图

高德的地图和google地图使用的座标一致，可以切换使用，但是据说百度的又增加了偏移。
3-1、普通地图

using GMap.NET;
using GMap.NET.MapProviders;
using GMap.NET.Projections;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace jiemian3.CustomMap
{
    public abstract class AMapProviderBase : GMapProvider
    {
        public AMapProviderBase()
        {
            MaxZoom = null;
            RefererUrl = "http://www.amap.com/";
            //Copyright = string.Format("©{0} 高德 Corporation, ©{0} NAVTEQ, ©{0} Image courtesy of NASA", DateTime.Today.Year);    
        }

        public override PureProjection Projection
        {
            get { return MercatorProjection.Instance; }
        }

        GMapProvider[] overlays;
        public override GMapProvider[] Overlays
        {
            get
            {
                if (overlays == null)
                {
                    overlays = new GMapProvider[] { this };
                }
                return overlays;
            }
        }
    }

    public class AMapProvider : AMapProviderBase
    {
        public static readonly AMapProvider Instance;

        readonly Guid id = new Guid("EF3DD303-3F74-4938-BF40-232D0595EE88");
        public override Guid Id
        {
            get { return id; }
        }

        readonly string name = "AMap";
        public override string Name
        {
            get
            {
                return name;
            }
        }

        static AMapProvider()
        {
            Instance = new AMapProvider();
        }

        public override PureImage GetTileImage(GPoint pos, int zoom)
        {
            try
            {
                string url = MakeTileImageUrl(pos, zoom, LanguageStr);
                return GetTileImageUsingHttp(url);
            }
            catch (Exception ex)
            {
                return null;
            }
        }

        string MakeTileImageUrl(GPoint pos, int zoom, string language)
        {
            var num = (pos.X + pos.Y) % 4 + 1;
            //string url = string.Format(UrlFormat, num, pos.X, pos.Y, zoom);
            string url = string.Format(UrlFormat, pos.X, pos.Y, zoom);
            return url;
        }

        //static readonly string UrlFormat = "http://webrd04.is.autonavi.com/appmaptile?x={0}&y={1}&z={2}&lang=zh_cn&size=1&scale=1&style=7";
        static readonly string UrlFormat = "http://webrd01.is.autonavi.com/appmaptile?lang=zh_cn&size=1&scale=1&style=7&x={0}&y={1}&z={2}";
    }
}

3-2、高德卫星地图，但是高德卫星地图（官网的地图）的数据不完整

using GMap.NET;
using GMap.NET.MapProviders;
using GMap.NET.Projections;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace jiemian3.CustomMap
{
    public class AMapSateliteProvider : AMapProviderBase
    {
        private readonly Guid id = new Guid("FCA94AF4-3467-47c6-BDA2-6F52E4A145BC");
        public static readonly AMapSateliteProvider Instance = new AMapSateliteProvider();
        //private readonly string name = Resources.Strings.AMapSatellite;
        private readonly string name = "AMapSatellite";
        private static readonly string UrlFormat = "http://webst04.is.autonavi.com/appmaptile?x={0}&y={1}&z={2}&lang=zh_cn&size=1&scale=1&style=6";

        public override PureImage GetTileImage(GPoint pos, int zoom)
        {
            string url = this.MakeTileImageUrl(pos, zoom, GMapProvider.LanguageStr);
            return base.GetTileImageUsingHttp(url);
        }

        private string MakeTileImageUrl(GPoint pos, int zoom, string language)
        {
            string str = string.Format(UrlFormat, pos.X, pos.Y, zoom);
            Console.WriteLine("url:" + str);
            return str;
        }

        public override Guid Id
        {
            get
            {
                return this.id;
            }
        }

        public override string Name
        {
            get
            {
                return this.name;
            }
        }
    }
}

4、自定义Marker

winform版的自己GMap提供了第三方的marker，但是WPF的需要自己写。可以参考源代码项目中Demo目录下面的“Demo.WindowsPresentation”，WPF所有的代码都可以参考这个Demo。我直接把“Demo.WindowsPresentation”里面对应的代码粘贴到下面。

因为这些代码再一个单独的文件夹下面，所以注意命名空间和路径，自己做调整。
CustomMarkerRed.xaml

<UserControl
	xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
	xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
	x:Class="Demo.WindowsPresentation.CustomMarkers.CustomMarkerRed"
	Height="40" Width="30" Opacity="10">
		<Image Name="icon" Source="red-dot.png" VerticalAlignment="Center" HorizontalAlignment="Center" />
</UserControl>

CustomMarkerRed.xaml.cs

using System.Windows;
using System.Windows.Controls;
using System.Windows.Controls.Primitives;
using System.Windows.Input;
using System.Windows.Media;
using GMap.NET.WindowsPresentation;

namespace Demo.WindowsPresentation.CustomMarkers
{
   /// <summary>
   /// Interaction logic for CustomMarkerDemo.xaml
   /// </summary>
   public partial class CustomMarkerRed
   {
      Popup Popup;
      Label Label;
      GMapMarker Marker;
      MainWindow MainWindow;

      public CustomMarkerRed(MainWindow window, GMapMarker marker, string title)
      {
         this.InitializeComponent();

         this.MainWindow = window;
         this.Marker = marker;

         Popup = new Popup();
         Label = new Label();

         this.Loaded += new RoutedEventHandler(CustomMarkerDemo_Loaded);
         this.SizeChanged += new SizeChangedEventHandler(CustomMarkerDemo_SizeChanged);
         this.MouseEnter += new MouseEventHandler(MarkerControl_MouseEnter);
         this.MouseLeave += new MouseEventHandler(MarkerControl_MouseLeave);
         this.MouseMove += new MouseEventHandler(CustomMarkerDemo_MouseMove);
         this.MouseLeftButtonUp += new MouseButtonEventHandler(CustomMarkerDemo_MouseLeftButtonUp);
         this.MouseLeftButtonDown += new MouseButtonEventHandler(CustomMarkerDemo_MouseLeftButtonDown);

         Popup.Placement = PlacementMode.Mouse;
         {
            Label.Background = Brushes.Blue;
            Label.Foreground = Brushes.White;
            Label.BorderBrush = Brushes.WhiteSmoke;
            Label.BorderThickness = new Thickness(2);
            Label.Padding = new Thickness(5);
            Label.FontSize = 22;
            Label.Content = title;
         }
         Popup.Child = Label;
      }

      void CustomMarkerDemo_Loaded(object sender, RoutedEventArgs e)
      {
         if(icon.Source.CanFreeze)
         {
            icon.Source.Freeze();
         }
      }

      void CustomMarkerDemo_SizeChanged(object sender, SizeChangedEventArgs e)
      {
         Marker.Offset = new Point(-e.NewSize.Width/2, -e.NewSize.Height);
      }

      void CustomMarkerDemo_MouseMove(object sender, MouseEventArgs e)
      {
         if(e.LeftButton == MouseButtonState.Pressed && IsMouseCaptured)
         {
            Point p = e.GetPosition(MainWindow.MainMap);
            Marker.Position = MainWindow.MainMap.FromLocalToLatLng((int) p.X, (int) p.Y);
         }
      }

      void CustomMarkerDemo_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
      {
         if(!IsMouseCaptured)
         {
            Mouse.Capture(this);
         }
      }

      void CustomMarkerDemo_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)
      {
         if(IsMouseCaptured)
         {
            Mouse.Capture(null);
         }
      }

      void MarkerControl_MouseLeave(object sender, MouseEventArgs e)
      {
         Marker.ZIndex -= 10000;
         Popup.IsOpen = false;
      }

      void MarkerControl_MouseEnter(object sender, MouseEventArgs e)
      {
         Marker.ZIndex += 10000;
         Popup.IsOpen = true;
      }
   }
}

在主界面中使用

currentMarker = new GMapMarker(MainMap.Position);
{
   currentMarker.Shape = new CustomMarkerRed(this, currentMarker, "custom position marker");
   currentMarker.Offset = new System.Windows.Point(-15, -15);
   currentMarker.ZIndex = int.MaxValue;
   MainMap.Markers.Add(currentMarker);
}

图片如下：

5、绘制多边形

下面只公布部分代码和思想，如果有不懂的可以提问。有些不方面提供。
5-1、多边形
使用dll中提供的GMapPolygon类。

List<PointLatLng> points = new List<PointLatLng>();
//在这块添加一些points
GMapPolygon polygon = new GMapPolygon(points);

polygon.ZIndex = 10; //设置Zindex，显示的优先级(层)
polygon.RegenerateShape(gmap); //gmap就是地图控件
//下面这个比较重要，是设置样式。
(polygon.Shape as Path).Stroke = Brushes.GreenYellow;
(polygon.Shape as Path).StrokeThickness = 5;
(polygon.Shape as Path).Effect = null;
gmap.Markers.Add(polygon);

5-2、折线（路径）
使用GMapRoute类，基本和上面的一样。

List<PointLatLng> points = new List<PointLatLng>();
//在这块添加一些points
GMapRoute route = new GMapRoute(points);//
route.ZIndex = 10;
route.RegenerateShape(gmap);
(route.Shape as Path).Stroke = Brushes.Blue;
(route.Shape as Path).StrokeThickness = 5;
(route.Shape as Path).Effect = null;
gmap.Markers.Add(route);

5-3、根据鼠标画矩形
这个需要自己写一些鼠标事件。这个自己发挥吧，代码有点乱，自己思考也不难。因为一些原因，这部分代码不能全部公布，多多理解。
下面的代码是画矩形的，只是没有鼠标事件的代码。已经很接近了。

PointLatLng startpoint = mainmarker.Position;
      List<PointLatLng> list_points = new List<PointLatLng>();
     
      if (startpoint.Lat > current_point.Lat)
      {
          if (startpoint.Lng < current_point.Lng)
          {
              //右下
              list_points.Add(startpoint);
              list_points.Add(new PointLatLng(startpoint.Lat, current_point.Lng));
              list_points.Add(current_point);
              list_points.Add(new PointLatLng(current_point.Lat, startpoint.Lng));
          }
          else
          {
              //左下
              list_points.Add(startpoint);
              list_points.Add(new PointLatLng(current_point.Lat, startpoint.Lng));
              list_points.Add(current_point);
              list_points.Add(new PointLatLng(startpoint.Lat, current_point.Lng));
          }
      }
      else
      {
          if (startpoint.Lng < current_point.Lng)
          {
              //右上
              list_points.Add(startpoint);
              list_points.Add(new PointLatLng(startpoint.Lat, current_point.Lng));
              list_points.Add(current_point);
              list_points.Add(new PointLatLng(current_point.Lat, startpoint.Lng));
          }
          else
          {
              //左上
              list_points.Add(startpoint);
              list_points.Add(new PointLatLng(current_point.Lat, startpoint.Lng));
              list_points.Add(current_point);
              list_points.Add(new PointLatLng(startpoint.Lat, current_point.Lng));
          }
      }
      double lat = (startpoint.Lat+current_point.Lat) / 2;
      double lng = (startpoint.Lng + current_point.Lng) / 2;
      double heightlat = Math.Abs(current_point.Lat-startpoint.Lat);
      double widthlng = Math.Abs(current_point.Lng-startpoint.Lng);
      rectLatLng = RectLatLng.FromLTRB(startpoint.Lng,startpoint.Lat,current_point.Lng,current_point.Lat);

      rectangle = new GMapPolygon(list_points);
      rectangle.ZIndex = Rectangle_index;
      rectangle.RegenerateShape(gmap);
      (rectangle.Shape as Path).Stroke = Brushes.GreenYellow;
      (rectangle.Shape as Path).StrokeThickness = 5;
      (rectangle.Shape as Path).Effect = null;

      gmap.Markers.Add(rectangle);

5-4、根据鼠标画圆形
上面的矩形还好是GMAP自己控件画的，但是圆形没有，也不能根据点画，因为有无数个点。最主要的是画的圆形要能够更具地图缩放。这部分还是参考Demo中的代码。思路是：使用一个XMAL控件，里面是一个圆，设置属性是填充的，然后改变边框即可改变圆的大小。首先根据鼠标移动位置和中心点的经纬度座标转化成界面座标，然后计算半径，画圆。
Circle.xaml

<UserControl x:Class="Demo.WindowsPresentation.CustomMarkers.Circle"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Height="300" Width="300" Background="Transparent">
    <Grid>
        <Ellipse Stroke="Red" Fill="AliceBlue" Opacity="0.44" />
    </Grid>
</UserControl>

Circle.xaml.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using GMap.NET;

namespace Demo.WindowsPresentation.CustomMarkers
{
   /// <summary>
   /// Interaction logic for Circle.xaml
   /// </summary>
   public partial class Circle : UserControl
   {
      public Circle()
      {
         InitializeComponent();
      }

      public PointLatLng Center;
      public PointLatLng Bound;
   }
}

画圆的代码

PointLatLng center = mainmarker.Position;
circle = new GMapMarker(center);
circle_shape = new Circle();
circle_shape.Center = center;
circle_shape.Bound = current_point;
circle_shape.Tag = circle;
circle_shape.IsHitTestVisible = false;
UpdateCircle(circle_shape);//下面的代码
circle.Shape = circle_shape;
circle.ZIndex = Circle_index;
gmap.Markers.Add(circle);

更新圆的大小的代码，这块每次在地图加载的时候调用就可以让圆不断变化大小。

 private void UpdateCircle(Circle c)
 {
     var pxCenter = gmap.FromLatLngToLocal(c.Center);
     var pxBounds = gmap.FromLatLngToLocal(c.Bound);
     Console.WriteLine(pxCenter + "            " + pxBounds);
     double a = (double)(pxBounds.X - pxCenter.X);
     double b = (double)(pxBounds.Y - pxCenter.Y);
     //半径
     var pxCircleRadius = Math.Sqrt(a * a + b * b);
     Console.WriteLine("半径为：" + pxCircleRadius);
     c.Width = pxCircleRadius * 2;
     c.Height = pxCircleRadius * 2;
     (c.Tag as GMapMarker).Offset = new System.Windows.Point(-c.Width / 2, -c.Height / 2);
 }

6、Zindex

WPF中没有GMapOverlay，但是可以使用Zindex来设置虚拟的。Zindex越大的显示就越靠上。

WPF使用GMap.net框架开发地图应用

1、导入dll

2、导入GMapControl控件

3、导入高德地图

4、自定义Marker

5、绘制多边形

6、Zindex

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