angularjs - 错误类型错误 : Cannot read property 'Point' of undefined, openlayers 3 & jsts - 服务器端

Question

我正在尝试关注 this example为了缓冲 map 上绘制的一些特征。

但是，这给了我以下错误:

ERROR TypeError: Cannot read property 'Point' of undefined

这是我的代码:

BufferFeature(feature){
        var parser = new jsts.io.OL3Parser();
            let format = new ol.format.WKT();
          // convert the OpenLayers geometry to a JSTS geometry
          var jstsGeom = parser.read(format.writeGeometry(feature.getGeometry()));

          // create a buffer of 40 meters around each line
          var buffered = jstsGeom.buffer(40);

          // convert back from JSTS and replace the geometry on the feature
          feature.setGeometry(parser.write(buffered)); 
        let source = this.VectorOverlay.getSource();
        source.addFeatures(feature);
    }

有人能找出我哪里出错了吗？

Answer 1

我终于用OL3Parse的inject方法解决了这个问题。你的代码应该是这样的:

    var Geojson = require('ol/format/geojson');
    var Vector = require('ol/source/vector');
    var Feature = require('ol/feature');
    var LineString = require('ol/geom/linestring');
    var Point = require('ol/geom/point');
    var jsts = require('jsts');

    var ol3Parser = new jsts.io.OL3Parser();
    ol3Parser.inject(Point, LineString);

    BufferFeature(feature){
          let format = new ol.format.WKT();
          // convert the OpenLayers geometry to a JSTS geometry
          var jstsGeom = ol3Parser.read(format.writeGeometry(feature.getGeometry()));

          // create a buffer of 40 meters around each line
          var buffered = jstsGeom.buffer(40);

          // convert back from JSTS and replace the geometry on the feature
          feature.setGeometry(parser.write(buffered)); 
          let source = this.VectorOverlay.getSource();
          source.addFeatures(feature);
    }

这适用于:

 function inject(Point, LineString, LinearRing, Polygon, MultiPoint, MultiLineString, MultiPolygon, GeometryCollection) {};