将要素另存为WKT

draw.on('drawend', function (e) {

                        if (webMapValues.drawType == 'Polygon') {
                            //var writer = new ol.format.GeoJSON();
                            //var geojsonStr = writer.writeFeatures(e.feature.getGeometry().getCoordinates());

                            var format = new ol.format.WKT();
                            var feature = format.readFeature(e.feature);

                            var justNowFeature = e.feature;
                            var featureGeom = justNowFeature.getGeometry();

                            })
                        }

到目前为止,我所尝试的一切都没有奏效……除了抓住所有的功能,这对我没有帮助。

这就是我获取所有功能的方式……我如何才能在“draund”中为e.feature做到这一点?

var drawLayer = rcisMapService.getLayer("Draw");

                        var drawSource = drawLayer.getSource();

                        //Getsource
                        var features = drawSource.getFeatures();

                        var writer = new ol.format.GeoJSON();
                        var geojsonStr = writer.writeFeatures(drawSource.getFeatures());