WPF简易局部地图实现标记绘制轨迹

控件可以实现：
在知道显示的地图区域时：

设定地图的左上角和右下角经纬度；
设置使用的地图图片路径；
添加地图图钉或者轨迹点；
绘制点或轨迹。

地图控件所需的数据结构：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Media;namespace SmartScreen.Controls.Models
{public class MapItem{public Brush Fill {  get; protected set; }}public class GeoPint{public GeoPint(double lat, double lon){Latitude = lat;Longitude = lon;}public double Latitude { get; set; }public double Longitude { get; set; }}
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;namespace SmartScreen.Controls.Models
{public class MapPolyLineItem : MapItem{public double Longitude { get; set; }public double Latitude { get; set; }}
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Media;namespace SmartScreen.Controls.Models
{public class MapPushPinItem : MapItem{public string Title { get; set; }public double Longitude { get; set; }public double Latitude { get; set; }private int warnningStatus;/// <summary>/// 警示状态，0：安全 1：预警 -1：警告/// </summary>public int WarnningStatus{get { return warnningStatus; }set{warnningStatus = value;if (warnningStatus == 0){Fill = (SolidColorBrush)Application.Current.FindResource("SafeColor");}else if (warnningStatus == 1){Fill = (SolidColorBrush)Application.Current.FindResource("WarnningColor");}else if (warnningStatus == -1){Fill = (SolidColorBrush)Application.Current.FindResource("DangerColor");}}}}
}

地图控件XAML(可以去掉zoomPanel:ZoomAndPanControl):

<UserControl x:Class="SmartScreen.Controls.MapControl"xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:local="clr-namespace:SmartScreen.Controls" xmlns:zoomPanel="clr-namespace:ZoomAndPan;assembly=ZoomAndPan"mc:Ignorable="d" x:Name="root"d:DesignHeight="450" d:DesignWidth="800"><UserControl.Resources><Style TargetType="Line"><Setter Property="Stroke" Value="{StaticResource DangerColor}"/><Setter Property="StrokeThickness" Value="2"/><Setter Property="Effect"><Setter.Value><DropShadowEffect Color="Gray" BlurRadius="8" ShadowDepth="0"/></Setter.Value></Setter></Style></UserControl.Resources><Grid><zoomPanel:ZoomAndPanControl x:Name="zoomPanel"  MouseWheel="map_MouseWheel"MaxContentScale="2.5"MinContentScale="1"MouseLeftButtonDown="Grid_MouseLeftButtonDown" MouseLeftButtonUp="Grid_MouseLeftButtonUp" MouseMove="Grid_MouseMove"><zoomPanel:ZoomAndPanControl.RenderTransform><TransformGroup><TranslateTransform x:Name="trans"/><ScaleTransform x:Name="scale"/></TransformGroup></zoomPanel:ZoomAndPanControl.RenderTransform><Grid><Image x:Name="bottomImage" Width="{Binding ElementName=root,Path=ActualWidth}" Height="{Binding ElementName=root,Path=ActualHeight}" Stretch="Fill" RenderOptions.BitmapScalingMode="Fant"/><!--标记层 ../Images/maptest.png--><Canvas x:Name="PushPincanvas"></Canvas><Canvas x:Name="PolyLinecanvas"></Canvas></Grid></zoomPanel:ZoomAndPanControl></Grid>
</UserControl>

地图控件后台代码：

using SmartScreen.Controls.Models;
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
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;namespace SmartScreen.Controls
{/// <summary>/// MapControl.xaml 的交互逻辑/// </summary>public partial class MapControl : UserControl{public MapControl(){InitializeComponent();SizeChanged += (s, e) => { RefreshPushPin(); RefreshPolyline(); };}/// <summary>/// 地图图片的路径/// </summary>public Uri MapPath{get { return (Uri)GetValue(MapPathProperty); }set { SetValue(MapPathProperty, value); }}public static readonly DependencyProperty MapPathProperty =DependencyProperty.Register("MapPath", typeof(Uri), typeof(MapControl), new PropertyMetadata(default(Uri), OnMapPathChanged));private static void OnMapPathChanged(DependencyObject d, DependencyPropertyChangedEventArgs e){MapControl ctrl = (MapControl)d;ctrl.bottomImage.Source = new BitmapImage(ctrl.MapPath);}/// <summary>/// 左上角经纬度/// </summary>public Point LeftTop{get { return (Point)GetValue(LeftTopProperty); }set { SetValue(LeftTopProperty, value); }}public static readonly DependencyProperty LeftTopProperty =DependencyProperty.Register("LeftTop", typeof(Point), typeof(MapControl), new PropertyMetadata(default(Point), OnMapReDrawChanged));/// <summary>/// 右下角经纬度/// </summary>public Point RightBottom{get { return (Point)GetValue(RightBottomProperty); }set { SetValue(RightBottomProperty, value); }}public static readonly DependencyProperty RightBottomProperty =DependencyProperty.Register("RightBottom", typeof(Point), typeof(MapControl), new PropertyMetadata(default(Point), OnMapReDrawChanged));/// <summary>/// 地图显示的图钉部件/// </summary>public ObservableCollection<MapPushPinItem> PushPins{get { return (ObservableCollection<MapPushPinItem>)GetValue(PushPinsProperty); }set { SetValue(PushPinsProperty, value); }}public static readonly DependencyProperty PushPinsProperty =DependencyProperty.Register("PushPins", typeof(ObservableCollection<MapPushPinItem>), typeof(MapControl), new PropertyMetadata(null, OnPushpinChanged));private static void OnPushpinChanged(DependencyObject d, DependencyPropertyChangedEventArgs e){if (d is MapControl map){if (map.PushPins != null){map.PushPins.CollectionChanged += (s, er) => map.RefreshPushPin();}map.RefreshPushPin();}}/// <summary>/// 地图显示的轨迹线段/// </summary>public ObservableCollection<MapPolyLineItem> PolyLines{get { return (ObservableCollection<MapPolyLineItem>)GetValue(PolyLinesProperty); }set { SetValue(PolyLinesProperty, value); }}public static readonly DependencyProperty PolyLinesProperty =DependencyProperty.Register("PolyLines", typeof(ObservableCollection<MapPolyLineItem>), typeof(MapControl), new PropertyMetadata(null, OnPolyLineChaned));private static void OnPolyLineChaned(DependencyObject d, DependencyPropertyChangedEventArgs e){if (d is MapControl map){if (map.PolyLines != null){map.PolyLines.CollectionChanged += (s, er) => map.RefreshPolyline();}map.RefreshPolyline();}}private static void OnMapReDrawChanged(DependencyObject d, DependencyPropertyChangedEventArgs e){MapControl control = (MapControl)d;control.RefreshPushPin();control.RefreshPolyline();}/// <summary>/// 刷新标记点的显示/// </summary>private void RefreshPushPin(){if (RightBottom == default(Point) || LeftTop == default(Point)){return;}var mapWidth = ActualWidth;var mapHeight = ActualHeight;var xRange = RightBottom.X - LeftTop.X;var yRange = LeftTop.Y - RightBottom.Y;if (PushPins != null){PushPincanvas.Children.Clear();foreach (var pushpin in PushPins){// 先计算在X Y 轴上的位置var canvasLeft = (pushpin.Longitude - LeftTop.X) / xRange * mapWidth;var canvasTop = (LeftTop.Y - pushpin.Latitude) / yRange * mapHeight;var pushpinCtrl = new MapPushPin();pushpinCtrl.DataContext = pushpin;Canvas.SetLeft(pushpinCtrl, canvasLeft);Canvas.SetTop(pushpinCtrl, canvasTop);PushPincanvas.Children.Add(pushpinCtrl);}}}/// <summary>/// 刷新轨迹的显示/// </summary>private void RefreshPolyline(){if (RightBottom == default(Point) || LeftTop == default(Point)){return;}var mapWidth = ActualWidth;var mapHeight = ActualHeight;var xRange = RightBottom.X - LeftTop.X;var yRange = LeftTop.Y - RightBottom.Y;if (PolyLines != null){PolyLinecanvas.Children.Clear();MapPolyLineItem lastPoint = null;foreach (var polyline in PolyLines){if (lastPoint == null){lastPoint = polyline;continue;}Line line = new Line();line.DataContext = polyline;line.X1 = 0;line.Y1 = 0;var canvasLeft = (lastPoint.Longitude - LeftTop.X) / xRange * mapWidth;var canvasTop = (LeftTop.Y - lastPoint.Latitude) / yRange * mapHeight;var point2x = (polyline.Longitude - LeftTop.X) / xRange * mapWidth - canvasLeft;var point2y = (LeftTop.Y - polyline.Latitude) / yRange * mapHeight - canvasTop;line.X2 = point2x;line.Y2 = point2y;Canvas.SetLeft(line, canvasLeft);Canvas.SetTop(line, canvasTop);PolyLinecanvas.Children.Add(line);lastPoint = polyline;}}}#region 缩放移动public FrameworkElement Container{get { return (FrameworkElement)GetValue(ContainerProperty); }set { SetValue(ContainerProperty, value); }}public static readonly DependencyProperty ContainerProperty =DependencyProperty.Register("Container", typeof(FrameworkElement), typeof(MapControl), new PropertyMetadata(null));public bool EnableZoomPan{get { return (bool)GetValue(EnableZoomPanProperty); }set { SetValue(EnableZoomPanProperty, value); }}public static readonly DependencyProperty EnableZoomPanProperty =DependencyProperty.Register("EnableZoomPan", typeof(bool), typeof(MapControl), new PropertyMetadata(false));Point lastPoint = default;private void Grid_MouseLeftButtonDown(object sender, MouseButtonEventArgs e){if (!EnableZoomPan){return;}lastPoint = e.GetPosition(Container);zoomPanel.CaptureMouse();}private void Grid_MouseLeftButtonUp(object sender, MouseButtonEventArgs e){if (!EnableZoomPan){return;}lastPoint = default;zoomPanel.ReleaseMouseCapture();}private void Grid_MouseMove(object sender, MouseEventArgs e){if (!EnableZoomPan){return;}if (e.LeftButton == MouseButtonState.Pressed){var nowPoint = e.GetPosition(Container);if (lastPoint == default){lastPoint = nowPoint;return;}var offsetX = (nowPoint.X - lastPoint.X) / scale.ScaleX;var offsetY = (nowPoint.Y - lastPoint.Y) / scale.ScaleX;lastPoint = nowPoint;trans.X += offsetX;trans.Y += offsetY;}}private void map_MouseWheel(object sender, MouseWheelEventArgs e){if (!EnableZoomPan){return;}var nowMouse = e.GetPosition(this);if (e.Delta > 0){zoomPanel.ZoomIn(nowMouse);}else{zoomPanel.ZoomOut(nowMouse);}if (zoomPanel.ContentScale == 1){trans.X = 0;trans.Y = 0;}}#endregion}
}

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