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TMS VCL WebGMaps
Working with Polylines

Adding a polyline: 
var 
  PolylineItem: TPolylineItem;
begin
  PolylineItem := WebGMaps1.Polygons.Add;  
  PolylineItem.Polyline.Width := 2;
  PolylineItem.Polyline.Path.Add(50, 2);
  PolylineItem.Polyline.Path.Add(52, 4);
  PolylineItem.Polyline.Path.Add(50, 4);

  WebGMaps1.CreateMapPolyline(PolylineItem.Polyline);
end;
Editing a polyline: 
PolylineItem.Polyline.Visible := not PolylineItem.Polyline.Visible;

WebGMaps1.UpdateMapPolyline(PolylineItem.Polyline);
Removing a polyline: 
//Removes the Polyline from the map
WebGMaps1.DeleteMapPolyline(PolylineItem.Index);

//Removes the Polyline from the collection
WebGMaps1.Polylines.Delete(PolylineItem.Index);