[C # winfrom using Google map] draw trajectory lines on a map

 

Google map uses Google. Maps. polyline to draw multiple line segments.

JavascriptCode:

VaR polyline;
 //  Draw a polygon Google. Maps. polyline      Function  Drawpolyline (latlngarray ){  VaR Path = New  Array ();  VaR Latlngs = latlngarray. tostring (). Split (";" );  For (IndexIn  Latlngs ){  VaR Latlng = latlngs [Index]. Split ("," );  If (Latlng. Length = 2 ) {Path. Push ((  New Google. Maps. latlng (latlng [0], latlng [1 ]);} Polyline = New  Google. Maps. polyline ({map: map, path: path, geodesic:  True , Strokecolor: "# Ff0000" , Strokeopacity: 0.6 , Strokeweight: 2 });}  Function  Clearpolyline (){  If (Polyline! = Null  ) {Polyline. setmap (  Null  );}} 

C # Call code:

Public static string drawpolyline (webbrowser WB, list <pointf> ptlist)
{
Stringbuilder sb = new stringbuilder ();
Foreach (VAR item in ptlist)
{
SB. appendformat ("{0}, {1};", item. Y, item. X );
}

Object [] objarray = new object [1] {sb. tostring (). trimend (';')};

String optname = "drawpolyline ";
Return donegooglemapop (WB, optname, objarray );
}

 //  Execute script commands          Private   Static   String Donegooglemapop (webbrowser WB, String  Optname, object [] objarray ){  String Retstr = "" ;  Try  {Object objret = WB. Document. invokescript (optname, objarray );  If (Objret! = Null  ) Retstr = Objret. tostring ();}  Catch  {}  Return  Retstr ;}  // Draw trajectory data          Public   Static   String Drawpolyline (webbrowser WB, list <latlng> Tracklist) {list <Pointf> ptlist = New List <pointf> (); Tracklist. foreach (item => Ptlist. Add ( New Pointf (( Float ) Item. lng ,( Float  ) Item. LAT )));  Return Drawpolyline (WB, ptlist );}  //  Clearpolyline          Public   Static   String  Clearpolyline (webbrowser WB ){  Return Donegooglemapop (WB, "  Clearpolyline  " , Null  );} 

Call with actual parameters:

Drawpolyline (wbgooglemap, tracklist );