geotools - 如何在geotools中获取要素的顶点

Question

有人可以告诉我如何通过 java geotools api 获取特征顶点吗？

就我而言，我在 postgis 中有一个多边形层，我可以查询该层的所有特征，并且我需要知道每个特征的顶点。

        SimpleFeatureSource featureSource = pgDatastore.getFeatureSource("hb_thuadat");
        Filter filter = CQL.toFilter("sothua = 10");
        SimpleFeatureCollection collection = featureSource.getFeatures( filter );
        System.out.print("tong so:"+ collection.size());

        FeatureIterator iter=collection.features();
        while( iter.hasNext() ){
            Feature feature = iter.next();
            System.out.println( feature.getIdentifier());
            //how to get vertices of feature here???
        }

任何帮助表示感谢！感谢！

Answer 1

通过将feature对象转换为SimpleFeature类型，您应该能够提取几何值，如下所示：

SimpleFeature sp = DataUtilities.simple(feature);
Geometry geom = (Geometry) sp.getDefaultGeometry();

可以像下面这样检索顶点：
Coordinate[] array_of_coords = geom.getCoordinates(); System.out.println(array_of_coords[0].x);//X Coordinate System.out.println(array_of_coords[0].y);//Y Coordinate

Answer 2

我通过这段代码找到了自己的解决方案

            Feature feature = iter.next();
            SimpleFeature sfeature = (SimpleFeature)feature;
            Geometry g = (Geometry)sfeature.getAttribute("the_geom");
            // System.out.print(g.getCoordinates().length);
            Coordinate coor = g.getCoordinate();
            System.out.println("x: " + coor.x);
            System.out.println("y: " + coor.y);