Compares bounding box and polygon

Not just center of mass
Tests are broken. RegionChooser now extracts more buildings for a given region

src/main/java/eu/simstadt/regionchooser/RegionExtractor.java

@@ -54,7 +54,7 @@ static int selectRegionDirectlyFromCityGML(String wktPolygon, String srsName, Wr
 		int cityObjectsCount = 0;
 		int foundBuildingsCount = 0;
 		int foundVegetationCount = 0;
-		Geometry poly = WKT_READER.read(wktPolygon);
+		Geometry polygon = WKT_READER.read(wktPolygon);
 
 		CityGmlIterator citygml = null;
 		for (int i = 0; i < citygmlPaths.length; i++) {
@@ -64,13 +64,11 @@ static int selectRegionDirectlyFromCityGML(String wktPolygon, String srsName, Wr
 			citygml = new CityGmlIterator(citygmlPath);
 			for (CityObjectMember cityObjectNode : citygml) {
 				if (cityObjectsCount == 0) {
-					sb.append(replaceEnvelopeInHeader(citygml.getHeader(), poly.getEnvelopeInternal(), srsName));
+					sb.append(replaceEnvelopeInHeader(citygml.getHeader(), polygon.getEnvelopeInternal(), srsName));
 				}
 				cityObjectsCount += 1;
 				if (cityObjectNode.hasCoordinates()) {
-					Coordinate coord = new Coordinate(cityObjectNode.x, cityObjectNode.y);
-					Point point = GEOMETRY_FACTORY.createPoint(coord);
-					if (point.within(poly)) {
+					if (isBoundingBoxTouching(cityObjectNode, polygon)) {
 						if (cityObjectNode.isBuilding()) {
 							foundBuildingsCount++;
 						} else {
@@ -102,6 +100,21 @@ static int selectRegionDirectlyFromCityGML(String wktPolygon, String srsName, Wr
 		return foundBuildingsCount;
 	}
 
+	/**
+	 * Returns true if bounding box of cityObjectNode intersects the polygon.
+	 */
+	private static boolean isBoundingBoxTouching(CityObjectMember cityObjectNode, Geometry polygon) {
+		return point(cityObjectNode.xMax, cityObjectNode.yMax).within(polygon) ||
+				point(cityObjectNode.xMax, cityObjectNode.yMin).within(polygon) ||
+				point(cityObjectNode.xMin, cityObjectNode.yMin).within(polygon) ||
+				point(cityObjectNode.xMin, cityObjectNode.yMax).within(polygon);
+	}
+
+	private static Point point(Double x, Double y) {
+		Coordinate coord = new Coordinate(x, y);
+		return GEOMETRY_FACTORY.createPoint(coord);
+	}
+
 	/**
 	 * Some Citygml files include an envelope (bounding box), defined at the very beginning of the file. If the extracted
 	 * region comes from a huge file (e.g. from NYC), it might inherit this header with a huge envelope. Some methods