GMapMarker _routeMaker = new GMapMarker(point);
 UserControlMapRoute routeCtrl = new UserControlMapRoute() { Marker = _routeMaker, MapCtrl = MainMap };
 routeCtrl.Init();
 _routeMaker.Shape = routeCtrl;
 //將圖層添加到地圖
 this.MainMap.Markers.Add(_routeMaker);

class MapRoutePath
 {
 public GMapControl MapCtrl { get; private set; } //地圖控件
 public Panel ParentPanel { get; private set; } //父面板，將PathRouteLine加入面板。

 public Path PathRouteLine { get; private set; } //顯示軌跡

 List<PointLatLng> _listGpsPoint = new List<PointLatLng>();
 List<Point> _listCtrlPt = new List<Point>();

 public List<PointLatLng> ListGpsPoint => _listGpsPoint; //包含的gps坐標
 public List<Point> ListPathPoint => _listCtrlPt; //轉(zhuǎn)換成立控件坐標
}

private void ToLocalPoint()
 {
  //_listGpsPoint存儲所gps坐標 _listCtrlPt存儲轉(zhuǎn)換后控件坐標
  _listCtrlPt.Clear();
  foreach (PointLatLng pt in _listGpsPoint)
  {
  Point ptGrid = ToCtrlPoint(pt);
  _listCtrlPt.Add(ptGrid);
  }
 }

 Point ToCtrlPoint(PointLatLng gpsPoint)
 {
  //轉(zhuǎn)換成GMap.NET控件坐標
  GPoint ptOfMapCtrl = MapCtrl.FromLatLngToLocal(gpsPoint);

  //GMap.NET控件坐標要轉(zhuǎn)換成 控件相對于直接父面板的坐標
  Point ptToMapCtrl2 = new Point(ptOfMapCtrl.X, ptOfMapCtrl.Y);
  Point ptOfScreen = MapCtrl.PointToScreen(ptToMapCtrl2);
  Point ptOfParentPanel = ParentPanel.PointFromScreen(ptOfScreen);

  return ptOfParentPanel;
 }

private static void CreatPath(Path path, List<Point> listPt)
 {
  if (listPt.Count <= 1)
  {
  path.Data = null;
  return;
  }

  PathFigure pathFigure = new PathFigure();
  pathFigure.StartPoint = listPt[0]; //起始點

  for (int i = 1; i < listPt.Count; i++)
  {
  //加入線段
  LineSegment line = new LineSegment() { Point = listPt[i] };
  pathFigure.Segments.Add(line);
  }

  PathGeometry geometry = new PathGeometry();
  geometry.Figures.Add(pathFigure);
  path.Data = geometry;
 }

private void ShowRouteMove()
 {
  //線路總長度
  double totalDistance = GetDistance();
  if (totalDistance == 0)
  return;

  //更加時間，計算當前走過的長度
  TimeSpan span = DateTime.Now - _startMoveTime;
  double curDistance = _moveSpeed * span.TotalHours;
  if (curDistance > totalDistance)
  {
  StopMove();
  curDistance = totalDistance;
  }


  Path path = CreateMovePath();
  //根據(jù)已走過的距離，獲取需要顯示的點
  List<Point> listCtrlPoint = GetListByDistance(curDistance);
  CreatPath(path, listCtrlPoint);

  ShowMoveTip(listCtrlPoint.Last(), curDistance);
 }

//根據(jù)當前移動的距離，獲取相應(yīng)的控件坐標
 private List<Point> GetListByDistance(double distance)
 {
  List<Point> result = new List<Point>();

  double start = 0;
  int i = 0;
  PointLatLng lastPt = new PointLatLng();
  foreach (PointLatLng pt in ListGpsPoint)
  {
  i++;
  if (i == 1) //第一個點
  {
   result.Add(ToCtrlPoint(pt));
   lastPt = pt;
   continue;
  }
  else
  {
   double lineDistance = MapHelper.GetDistance(lastPt, pt);
   lastPt = pt;
   if (lineDistance == 0)
   continue;

   if ((start + lineDistance) == distance) //gps坐標恰好符合當前的距離
   {
   result.Add(ToCtrlPoint(pt));
   break;
   }
   else if ((start + lineDistance) < distance) //當前的點小于需要的距離
   {
   result.Add(ToCtrlPoint(pt));
   start += lineDistance;
   }
   else
   {
   //最終的點 落在兩個gps點之間，需要進一步計算
   double midDistance = distance - start;
   double rate = midDistance / lineDistance;

   Point endPoint = ToCtrlPoint(pt);
   Point midPoint = MapHelper.GetMidPoint(result.Last(), endPoint, rate);
   result.Add(midPoint);
   break;
   }
  }
  }
  return result;
 }

class MapHelper
 {
 //根據(jù)兩點坐標，和在這兩點之間的比例，獲取計算后的坐標
 internal static Point GetMidPoint(Point start, Point end, double rate)
 {
  Point result = new Point();
  result.X = start.X + rate * (end.X - start.X);
  result.Y = start.Y + rate * (end.Y - start.Y);
  return result;
 }
 }

UserControlMoveTip _userControlMoveTip;
 private void ShowMoveTip(Point startPoint,double moveDistance)
 {
  if(_userControlMoveTip == null)
  {
  _userControlMoveTip = new UserControlMoveTip();
  _userControlMoveTip.HorizontalAlignment = HorizontalAlignment.Left;
  _userControlMoveTip.VerticalAlignment = VerticalAlignment.Top;
  ParentPanel.Children.Add(_userControlMoveTip);
  }

  if (_userControlMoveTip.ActualHeight == double.NaN)
  {
  _userControlMoveTip.Visibility = Visibility.Hidden;
  return;
  }

  _userControlMoveTip.Visibility = Visibility.Visible;
  _userControlMoveTip.TotalDistance = GetDistance();
  _userControlMoveTip.TotalTimeSpan = TimeSpan.FromHours(_userControlMoveTip.TotalDistance / _moveSpeed);
  _userControlMoveTip.MoveSpeed = _moveSpeed;
  _userControlMoveTip.MoveDistance = moveDistance;
  _userControlMoveTip.TimeElapse = (DateTime.Now - _startMoveTime);

  _userControlMoveTip.Margin = new Thickness(startPoint.X+5, startPoint.Y - _userControlMoveTip.ActualHeight-2, 0, 0);
 }