Allow local coordinates

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

@@ -6,6 +6,7 @@
 import java.nio.file.Paths;
 import java.util.Scanner;
 import java.util.concurrent.Callable;
+import org.osgeo.proj4j.CoordinateReferenceSystem;
 import picocli.CommandLine;
 import picocli.CommandLine.Command;
 import picocli.CommandLine.Option;
@@ -25,7 +26,9 @@ class RegionChooserCommandLineInterface implements Callable<Integer>
 	@Option(names = { "-e", "--epsg" }, description = "EPSG id for coordinate reference system", paramLabel = "31467")
 	Integer espgId;
 
-	//TODO: Add possibility to choose wgs84 or local_crs
+	@Option(names = { "-l",
+			"--local" }, description = "Are WKT coordinates in local CRS?", paramLabel = "local_coordinates?")
+	boolean localCoordinates;
 
 	@Option(names = { "-w",
 			"--wkt" }, description = "File containing WKT polygon, or - for stdin", paramLabel = "polygon.wkt")
@@ -33,15 +36,15 @@ class RegionChooserCommandLineInterface implements Callable<Integer>
 
 	@Override
 	public Integer call() throws Exception {
-		String srsName;
+		CoordinateReferenceSystem localCRS;
 
 		if (espgId == null) {
-			srsName = RegionChooserUtils.crsFromCityGMLHeader(citygmls[0]).toString();
+			localCRS = RegionChooserUtils.crsFromCityGMLHeader(citygmls[0]);
 		} else {
-			srsName = "EPSG:" + espgId;
+			localCRS = RegionChooserUtils.crsFromSrsName("EPSG:" + espgId);
 		}
 
-		String wktPolygon = "unknown";
+		String wktPolygon;
 
 		if (wktFile.equals("-")) {
 			if (System.in.available() == 0) {
@@ -56,9 +59,13 @@ public Integer call() throws Exception {
 			}
 		}
 
+		if (!localCoordinates) {
+			// WKT coordinates are in WGS84, so should be first converted to srsName
+		}
+
 		System.out.println("WKT Polygon : " + wktPolygon);
 
-		StringBuilder sb = RegionExtractor.selectRegionDirectlyFromCityGML(wktPolygon, srsName, citygmls);
+		StringBuilder sb = RegionExtractor.selectRegionDirectlyFromCityGML(wktPolygon, localCRS.toString(), citygmls);
 
 		RegionChooserUtils.writeStringBuilderToFile(sb, outputCityGML);
 

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

@@ -47,7 +47,7 @@ private RegionChooserUtils() {
 	 * @param srsName
 	 * @return CoordinateReferenceSystem
 	 */
-	private static CoordinateReferenceSystem crsFromSrsName(String srsName) {
+	public static CoordinateReferenceSystem crsFromSrsName(String srsName) {
 		// EPSG:31467
 		Pattern pEPSG = Pattern.compile("^(EPSG:\\d+)$");
 		Matcher mEPSG = pEPSG.matcher(srsName);