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

Source: Internet
Author: User
Tags polyline

 

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 );

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