geotools - 如何在geotools中获取特征的顶点

Question

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

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???
        }

任何帮助都是值得赞赏的!谢谢!

Answer 1

通过将您的 feature 对象转换为 SimpleFeature 类型，您应该能够提取如下几何值:

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

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