关于c＃：GMap.Net标记最初位置不正确

GMap.Net marker initially in incorrect position

我用GMAP添加了一个带有指定lat/long的标记。当应用程序启动时，标记被放置在错误的位置(在gmap控件的中心)，然后当我缩放时，它将转到指定的坐标。这是GMAP中的错误还是我做错了什么？这是密码。

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GMapOverlay markersOverlay, mo2;
GMarkerGoogle marker, marker5;
GMapOverlay polyOverlay;
List<PointLatLng> points;
GMapRoute gr;
Graphics g;
bool start = true;
double move = .0001;
double lt = 73, lg = -180;

public Form1()
{
AllocConsole();
InitializeComponent();
try
{
System.Net.IPHostEntry e = System.Net.Dns.GetHostEntry("www.google.com");
}
catch
{
gmap.Manager.Mode = AccessMode.CacheOnly;
MessageBox.Show("No internet connection avaible, going to CacheOnly mode.","GMap.NET - Demo.WindowsForms", MessageBoxButtons.OK, MessageBoxIcon.Warning);
}

gmap.MapProvider = GMapProviders.BingHybridMap;
gmap.Position = new PointLatLng(32, -100);
gmap.MinZoom = 3;
gmap.MaxZoom = 15;
gmap.Zoom = 9;
markersOverlay = new GMapOverlay("markers");
mo2 = new GMapOverlay("markers5");
marker5 = new GMarkerGoogle(new PointLatLng(lt, lg), GMarkerGoogleType.orange_small);
g = this.CreateGraphics();
}

private void Form1_Load(object sender, EventArgs e)
{
gmap.DragButton = MouseButtons.Left;
gmap.ShowCenter = false;
points = new List<PointLatLng>();
polyOverlay = new GMapOverlay("polygons");
GMapPolygon polygon = new GMapPolygon(points,"mypolygon");
polygon.Fill = new SolidBrush(Color.FromArgb(50, Color.Magenta));
polygon.Stroke = new Pen(Color.Magenta, 2);
}

protected void OnMouseMove(object sender, MouseEventArgs e)
{
PointLatLng p = gmap.FromLocalToLatLng(e.X, e.Y);
MouseLatLong.Text = Convert.ToString(p);
}

private void SubmitButton_Click(object sender, EventArgs e)
{
marker = new GMarkerGoogle(new PointLatLng(double.Parse(LattextBox.Text), double.Parse(LongtextBox.Text)), new Bitmap(@"C:\Users\Vaib\Documents\Visual Studio 2013\Projects\testGmap\testGmap
esources\wpt.png"));
mo2.Markers.Add(marker);
gmap.Overlays.Add(mo2);
marker.ToolTip = new GMapToolTip(marker);
marker.ToolTipText = NametextBox.Text;
marker.ToolTipMode = MarkerTooltipMode.Always;

if (start)
{
gmap.Position = new PointLatLng(marker.Position.Lat, marker.Position.Lng);
start = false;
}

points.Add(new PointLatLng(marker.Position.Lat, marker.Position.Lng));
gr = new GMapRoute(points,"route");
gr.Stroke = new Pen(Color.Magenta, 2);
polyOverlay.Routes.Add(gr);
gmap.Overlays.Add(polyOverlay);
ga = new GMarkerArrow(new PointLatLng(gr.From.Value.Lat, gr.From.Value.Lng));

if (points.Count >= 2)
{
ga.Bearing = (float)final(gr.From.Value.Lat, gr.From.Value.Lng, points[1].Lat, points[1].Lng);
}

markersOverlay.Clear();
markersOverlay.Markers.Add(ga);
gmap.Overlays.Add(markersOverlay);
}

相关讨论

我在一个WiFrm应用程序中工作在MSVC2010(C++)上，同样的问题，大部分时间都在解决。

这个线程很有用，但我发现您需要做的只是(抱歉，它不是c)在您第一次添加标记时注释掉-请参见

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// DO NOT ADD... line
// Make marker
WindowsForms::Markers::GMarkerGoogle ^MyMarker;
WindowsForms::Markers::GMarkerGoogleType MyType = safe_cast<WindowsForms::Markers::GMarkerGoogleType>(3); // Blue marker 3
MyMarker = gcnew WindowsForms::Markers::GMarkerGoogle( PointLatLng(40.7, -74.0), MyType);
// MyOverlay->Markers->Add(MyMarker); // DO NOT ADD THE MARKER!!!
gMapControl1->Overlays->Add(MyOverlay);
MyMarker = gcnew WindowsForms::Markers::GMarkerGoogle( PointLatLng(40.7, -74.0), MyType);
MyOverlay->Markers->Add(MyMarker);
gMapControl1->Overlays->Add(MyOverlay);
gMapControl1->ReloadMap();