Polygon um Closed-Loop-Polylinie Ausgabe

Question

Ich muss ein Polygon auf Karte um Google Maps Richtung Polylinie zeichnen. Ich verwende eine Lösung basierend auf JSTS-Bibliothek, beschrieben here Alles ist in Ordnung, bis die Richtungs-Polylinie geschlossene Schleifen erzeugt. In solchen Fällen erhalten i seltsame Artefakte (wie Sie auf das Bild unten sehen) polygon bug inside closed loops

Für Polygon zeichnen verwende ich diese Funktion

 function drawPoligon(){ 
      var overviewPath = mainPath; 
      var overviewPathGeo = []; 
      var polygonalPath = []; 
      var lDistance = 0.00899928005759539 * 5 *2; 
      for (var i = 0; i < overviewPath.length; i++) { 
       overviewPathGeo.push([overviewPath[i].lat(), overviewPath[i].lng() ]); 
      } 
      var geoInput = googleMaps2JTS(overviewPath); 
      var geometryFactory = new jsts.geom.GeometryFactory(); 
      var shell = geometryFactory.createLineString(geoInput); 
      var polygon = shell.buffer(lDistance); 
      if (routePolygon && routePolygon.setMap) routePolygon.setMap(null); 
      routePolygon = new google.maps.Polygon({ 
       paths: jsts2googleMaps(polygon), 
       strokeColor: '#FF0000', 
       strokeOpacity: 0.2, 
       strokeWeight: 2, 
       fillColor: "#FF0000", 
       fillOpacity: 0.2, 
       map: map 
      }); 
     } 

Voll Beispiel here on JSFiddle

ist, ist es möglich, dieses Problem zu vermeiden, mit JSTS-Bibliothek oder ist es etwas falsch von der Google-Seite beim Zeichnen von Polygonen?

Answer 1

Doing

var polygon = shell.buffer(lDistance); 

var wktWriter = new jsts.io.WKTWriter(); 
var wkt = wktWriter.write(polygon); 
console.log(wkt); 

Sie die WKT für den erzeugten Puffer Polygon extrahieren kann:

POLYGON ((43.53564851585564 -1.619308730713745, 43.48029565895185 -1.6815942016692849, 43.37754344989339 -1.9635971597872128, 43.36806254752958 -2.2471770416347034, 43.365070840360964 -2.2673703343947054, 43.35760507166823 -2.286369852338605, 43.26040507166823 -2.4694498523386055, 43.25088257303102 -2.483853379142792, 43.238784525186446 -2.4961731519915507, 42.994869049951106 -2.7009527181067208, 42.78135258237344 -2.978642772583373, 42.38549606185889 -3.7836035068779834, 42.38541430255075 -3.7837693312814222, 42.14935430255075 -4.2613093312814225, 42.141395750868526 -4.274450031413887, 41.858166438751326 -4.662892503991992, 41.56089359834704 -5.079132430427735, 41.55441856165125 -5.087178973493849, 41.24409635897653 -5.430460104880776, 41.030435825626135 -5.757301488089262, 41.01901732161862 -5.77142054291938, 41.00499690042606 -5.782959942065295, 40.988945388268654 -5.7914498714246125, 40.971516305029105 -5.796544672745033, 40.95341925690045 -5.7980369167246515, 40.93539104554065 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importieren es auf JTS Testbuilder sieht es so aus, was bedeutet, dass JSTS eine korrekte Polygon erzeugt aber Google Karten zieht es nicht richtig: