import javafx.application.Application;
import javafx.geometry.Rectangle2D;
import javafx.scene.Scene;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.layout.HBox;
import javafx.stage.Stage;

public class BildDarstellen extends Application {
    @Override
    public void start(Stage primaryStage) {
        Image image = new Image("img/wien.jpg");

        ImageView imgView = new ImageView();
        imgView.setImage(image);
        Rectangle2D viewportRect = new Rectangle2D(170, 80, 120, 300);
        imgView.setViewport(viewportRect);

        HBox box = new HBox();
        box.getChildren().add(imgView);
        Scene scene = new Scene(box);

        primaryStage.setTitle("ImageView Beispiel");
        primaryStage.setWidth(imgView.getViewport().getWidth());
        primaryStage.setHeight(imgView.getViewport().getHeight());
        primaryStage.setScene(scene);
        primaryStage.show();
    }

    public static void main(String[] args) {
            Application.launch(args);
    }
}