GMap.NET使用教程

* Bearing - 按照指定的度数向左旋转地图 
* CanDragMap – 是否启用鼠标右键拖动（平移）地图 
* EmptyTileColor – 设置没有数据的切片所显示的颜色 
* MarkersEnabled – 是否显示定义的标记，同PolygonsEnabled和RoutesEnabled 
* ShowTileGridLines – 显示网格线 
* Zoom，MinZoom和MaxZoom - 缩放级别

this.gMapControl1.MapProvider = OpenStreet4UMapProvider.Instance; // 设置地图源
GMaps.Instance.Mode = AccessMode.ServerAndCache; // GMap工作模式
this.gMapControl1.SetPositionByKeywords("北京"); // 地图中心位置

//使用经纬度设置地图中心
//this.gMapControl1.Position = new GMap.NET.PointLatLng(39.923518, 116.539009);

this.gMapControl1.DragButton = MouseButtons.Left;

//创建一个名为“markers”的图层
GMapOverlay markers = new GMapOverlay("markers");
//创建标记，并设置位置及样式
GMapMarker marker = new GMarkerGoogle(new PointLatLng(39.923518, 116.539009), GMarkerGoogleType.blue_pushpin);
//将标记添加到图层
markers.Markers.Add(marker);
//将图层添加到地图
this.gMapControl1.Overlays.Add(markers);

public GMarkerGoogle(PointLatLng p, GMarkerGoogleType type);
public GMarkerGoogle(PointLatLng p, Bitmap Bitmap);

marker.ToolTipText = "我在这里";
marker.ToolTip.Fill = new SolidBrush(Color.FromArgb(100, Color.Black));
marker.ToolTip.Foreground = Brushes.White;
marker.ToolTip.TextPadding = new Size(20, 20);

this.gMapControl1.ShowCenter = false; //隐藏中心十字

private void gMapControl1_OnMarkerClick(GMapMarker item, MouseEventArgs e)
{
    MessageBox.Show(String.Format("Marker：{0} 被点了。", item.ToolTipText));
}

GMapOverlay polygons = new GMapOverlay("polygons");
// 多边形的顶点
List<PointLatLng> points = new List<PointLatLng>();
points.Add(new PointLatLng(39.92244, 116.3922));
points.Add(new PointLatLng(39.92280, 116.4015));
points.Add(new PointLatLng(39.91378, 116.4019));
points.Add(new PointLatLng(39.91346, 116.3926));
GMapPolygon polygon = new GMapPolygon(points, "故宫");
polygon.Fill = new SolidBrush(Color.FromArgb(50, Color.Red));
polygon.Stroke = new Pen(Color.Red, 1);
polygons.Polygons.Add(polygon);
this.gMapControl1.Overlays.Add(polygons);

//avoidHighways：是否避免走高速公路
//walkingMode：是否步行
//zoom：查找路径时的zoom

//根据起止点经纬度查找路径
MapRoute GetRoute(PointLatLng start, PointLatLng end, bool avoidHighways, bool walkingMode, int Zoom);
//根据起止点地址查找路径
MapRoute GetRoute(string start, string end, bool avoidHighways, bool walkingMode, int Zoom);

int isSetPoint;  //设置起止点，1为起点，2为终点
PointLatLng startPoint; //起点
PointLatLng endPoint;   //终点

private void btn_SetStart_Click(object sender, EventArgs e)
{
    isSetPoint = 1;
}

private void btn_SetEnd_Click(object sender, EventArgs e)
{
    isSetPoint = 2;
}

//点击地图添加起止点
private void gMapControl1_MouseClick(object sender, MouseEventArgs e)
{
    PointLatLng point = this.gMapControl1.FromLocalToLatLng(e.X, e.Y);
    switch (isSetPoint)
    {
        case 1:
            //起点
            startPoint = point;
            GMapMarker marker1 = new GMarkerGoogle(startPoint, GMarkerGoogleType.red_pushpin);
            //清除上一次添加的起点
            markerStart.Markers.Clear();
            markerStart.Markers.Add(marker1);
            break;
        case 2:
            //终点
            endPoint = point;
            GMapMarker marker2 = new GMarkerGoogle(endPoint, GMarkerGoogleType.blue_pushpin);
            markerEnd.Markers.Clear();
            markerEnd.Markers.Add(marker2);
            break;
        default:
            break;
    }
}

private void btn_FindRoute_Click(object sender, EventArgs e)
{
    //点击查找路径后，不再添加点
    isSetPoint = 0;
    RoutingProvider rp = this.gMapControl1.MapProvider as RoutingProvider;
    //获取路径
    MapRoute route = rp.GetRoute(startPoint, endPoint, false, false, (int)this.gMapControl1.Zoom);
    if (route != null)
    {
        //添加routes图层
        GMapOverlay routes = new GMapOverlay("routes");
        GMapRoute r = new GMapRoute(route.Points, route.Name);
        r.Stroke = new Pen(Color.Red, 3);
        routes.Routes.Add(r);
        //添加到地图
        this.gMapControl1.Overlays.Add(routes);
        this.gMapControl1.ZoomAndCenterRoute(r);
    }
    else
    {
        MessageBox.Show("未能找到路线");
    }
}