在GeoTools中,可以使用以下步骤在单个图层中的所有多边形周围绘制一条线:
以下是一个示例代码片段,演示了如何在单个图层中的所有多边形周围绘制一条线:
import org.geotools.data.collection.ListFeatureCollection;
import org.geotools.feature.simple.SimpleFeatureBuilder;
import org.geotools.feature.simple.SimpleFeatureTypeBuilder;
import org.geotools.geometry.jts.JTSFactoryFinder;
import org.locationtech.jts.geom.*;
import org.opengis.feature.simple.SimpleFeature;
import org.opengis.feature.simple.SimpleFeatureType;
public class PolygonOutline {
public static void main(String[] args) throws Exception {
// 创建一个空的FeatureCollection
SimpleFeatureTypeBuilder typeBuilder = new SimpleFeatureTypeBuilder();
typeBuilder.setName("PolygonOutline");
typeBuilder.setCRS(DefaultGeographicCRS.WGS84);
typeBuilder.add("geometry", LineString.class);
SimpleFeatureType featureType = typeBuilder.buildFeatureType();
ListFeatureCollection featureCollection = new ListFeatureCollection(featureType);
// 遍历图层的所有要素
SimpleFeatureIterator featureIterator = layer.features();
try {
while (featureIterator.hasNext()) {
SimpleFeature feature = featureIterator.next();
// 获取多边形几何对象
Geometry geometry = (Geometry) feature.getDefaultGeometry();
if (geometry instanceof Polygon) {
Polygon polygon = (Polygon) geometry;
// 获取外环的坐标序列
Coordinate[] coordinates = polygon.getExteriorRing().getCoordinates();
// 创建新的线几何对象
GeometryFactory geometryFactory = JTSFactoryFinder.getGeometryFactory();
LineString lineString = geometryFactory.createLineString(coordinates);
// 创建新的Feature对象
SimpleFeatureBuilder featureBuilder = new SimpleFeatureBuilder(featureType);
featureBuilder.add(lineString);
SimpleFeature newFeature = featureBuilder.buildFeature(null);
// 将新的Feature对象添加到FeatureCollection中
featureCollection.add(newFeature);
}
}
} finally {
featureIterator.close();
}
// 可以将FeatureCollection保存到新的图层中,或者将其绘制在地图上
// ...
}
}
请注意,上述代码仅演示了如何在单个图层中的所有多边形周围绘制一条线,具体的应用场景和推荐的腾讯云相关产品需要根据实际需求进行选择。
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