GMap.Net开发之自定义Marker

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using GMap.NET;
using GMap.NET.WindowsForms;
using GMap.NET.MapProviders;
using GMap.NET.WindowsForms.Markers;

namespace GMapWinFormDemo
{
    public partial class MainForm : Form
    {
        private GMapOverlay objects = new GMapOverlay("objects"); //放置marker的图层
        private GMapMarkerImage currentMarker;
        private bool isLeftButtonDown = false;

        private Timer blinkTimer = new Timer();

        public MainForm()
        {
            InitializeComponent();

            try
            {
                System.Net.IPHostEntry e = System.Net.Dns.GetHostEntry("ditu.google.cn");
            }
            catch
            {
                mapControl.Manager.Mode = AccessMode.CacheOnly;
                MessageBox.Show("No internet connection avaible, going to CacheOnly mode.", "GMap.NET Demo", MessageBoxButtons.OK, MessageBoxIcon.Warning);
            }

            mapControl.CacheLocation = Environment.CurrentDirectory + "\\GMapCache\\"; //缓存位置
            mapControl.MapProvider = GMapProviders.GoogleChinaMap; //google china 地图
            mapControl.MinZoom = 2;  //最小比例
            mapControl.MaxZoom = 17; //最大比例
            mapControl.Zoom = 5;     //当前比例
            mapControl.ShowCenter = false; //不显示中心十字点
            mapControl.DragButton = System.Windows.Forms.MouseButtons.Left; //左键拖拽地图
            mapControl.Position = new PointLatLng(32.064,118.704); //地图中心位置：南京

            mapControl.OnMapZoomChanged += new MapZoomChanged(mapControl_OnMapZoomChanged);
            mapControl.MouseClick += new MouseEventHandler(mapControl_MouseClick);
            mapControl.MouseDown += new MouseEventHandler(mapControl_MouseDown);
            mapControl.MouseUp += new MouseEventHandler(mapControl_MouseUp);
            mapControl.MouseMove += new MouseEventHandler(mapControl_MouseMove);

            mapControl.OnMarkerClick += new MarkerClick(mapControl_OnMarkerClick);
            mapControl.OnMarkerEnter += new MarkerEnter(mapControl_OnMarkerEnter);
            mapControl.OnMarkerLeave += new MarkerLeave(mapControl_OnMarkerLeave);

            mapControl.Overlays.Add(objects);
        }

        void mapControl_MouseMove(object sender, MouseEventArgs e)
        {
            if (e.Button == System.Windows.Forms.MouseButtons.Left && isLeftButtonDown)
            {
                if (currentMarker != null)
                {
                    PointLatLng point = mapControl.FromLocalToLatLng(e.X, e.Y);
                    currentMarker.Position = point;
                    currentMarker.ToolTipText = string.Format("{0},{1}", point.Lat, point.Lng);
                }
            }
        }

        void mapControl_MouseUp(object sender, MouseEventArgs e)
        {
            if (e.Button == System.Windows.Forms.MouseButtons.Left)
            {
                isLeftButtonDown = false;
            }
        }

        void mapControl_MouseDown(object sender, MouseEventArgs e)
        {
            if (e.Button == System.Windows.Forms.MouseButtons.Left)
            {
                isLeftButtonDown = true;
            }
        }

        void mapControl_OnMarkerLeave(GMapMarker item)
        {
            if (item is GMapMarkerImage)
            {
                currentMarker = null;
                GMapMarkerImage m = item as GMapMarkerImage;
                m.Pen.Dispose();
                m.Pen = null;
            }
        }

        void mapControl_OnMarkerEnter(GMapMarker item)
        {
            if (item is GMapMarkerImage)
            {
                currentMarker = item as GMapMarkerImage;
                currentMarker.Pen = new Pen(Brushes.Red, 2);
            }
        }

        void mapControl_OnMarkerClick(GMapMarker item, MouseEventArgs e)
        {
        }

        void mapControl_MouseClick(object sender, MouseEventArgs e)
        {
            if(e.Button == System.Windows.Forms.MouseButtons.Right)
            {
                //objects.Markers.Clear();
                PointLatLng point = mapControl.FromLocalToLatLng(e.X,e.Y);
                //GMapMarker marker = new GMarkerGoogle(point, GMarkerGoogleType.green);
                Bitmap bitmap = Bitmap.FromFile("F:\\Projects\\GMapDemo\\GMapDemo\\Image\\A.png") as Bitmap;
                //GMapMarker marker = new GMarkerGoogle(point, bitmap);
                GMapMarker marker = new GMapMarkerImage(point, bitmap);
                marker.ToolTipMode = MarkerTooltipMode.OnMouseOver;
                marker.ToolTipText = string.Format("{0},{1}", point.Lat, point.Lng);
                objects.Markers.Add(marker);
            }
        }

        void mapControl_OnMapZoomChanged()
        {
        }

        private void buttonBeginBlink_Click(object sender, EventArgs e)
        {
            blinkTimer.Interval = 1000;
            blinkTimer.Tick += new EventHandler(blinkTimer_Tick);
            blinkTimer.Start();
        }

        void blinkTimer_Tick(object sender, EventArgs e)
        {
            foreach (GMapMarker m in objects.Markers)
            {
                if (m is GMapMarkerImage)
                {
                    GMapMarkerImage marker = m as GMapMarkerImage;
                    if (marker.OutPen == null)
                        marker.OutPen = new Pen(Brushes.Red, 2);
                    else
                    {
                        marker.OutPen.Dispose();
                        marker.OutPen = null;
                    }
                }
            }
            mapControl.Refresh();
        }

        private void buttonStopBlink_Click(object sender, EventArgs e)
        {
            blinkTimer.Stop();
            foreach (GMapMarker m in objects.Markers)
            {
                if (m is GMapMarkerImage)
                {
                    GMapMarkerImage marker = m as GMapMarkerImage;
                    marker.OutPen.Dispose();
                    marker.OutPen = null;
                }
            }
            mapControl.Refresh();
        }
    }
}