闭环折线问题的多边形

Question

我需要在Google地图方向折线周围的地图上绘制一个多边形。我使用基于JSTS库的解决方案，描述here 一切都好，直到方向折线创建闭环。在这种情况下，我会收到奇怪的文物（如下图所示）polygon bug inside closed loops

对于绘制多边形i，请使用此函数

        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
            });
        }

完整示例是here on JSFiddle

是否可以避免使用JSTS库的这个问题，或者在绘制多边形时Google方面是否有问题？

Answer 1

否则

var polygon = shell.buffer(lDistance);

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

您可以为生成的缓冲区多边形提取WKT：

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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在JTS TestBuilder上导入它看起来像这样，这意味着JSTS正在生成一个正确的多边形，但谷歌地图没有正确绘制它：