CtvrAObrazek

public class FXMLDocumentController implements Initializable {

    @FXML
    private Pane pane;

    ObservableList<Rectangle> obdelniky;
    private final String[] typy  = {"Plna", "Carkovana", "Teckovana"};
    double startX;
    double startY;
    @FXML
    private ColorPicker colorPicker;
    @FXML
    private ComboBox<String> cbOkraj;
    private Rectangle rec;




    @Override
    public void initialize(URL url, ResourceBundle rb) {
        obdelniky = FXCollections.observableArrayList();
        cbOkraj.getItems().addAll(typy);
        cbOkraj.getSelectionModel().selectFirst();
        doGradient();
    }

    @FXML
    private void mouseDragged(MouseEvent event) {
        double x = Math.abs(event.getX() - startX);
        double y = Math.abs(event.getY() - startY);

        rec.setWidth(2 * x);
        rec.setHeight(2 * y);

        rec.setX(startX - x);
        rec.setY(startY - y);

    }

    @FXML
    private void mousePressed(MouseEvent event) {
            if (event.isPrimaryButtonDown()) {
                startX = event.getX();
                startY = event.getY();

                rec = new Rectangle();

                rec.setWidth(2);
                rec.setHeight(1);
                rec.setStrokeWidth(2);
                switch (cbOkraj.getSelectionModel().getSelectedItem()) {
                    case "Plna":
                        break;
                    case "Carkovana":
                        rec.getStrokeDashArray().addAll(20d, 20d);
                        break;
                    case "Teckovana":
                        rec.getStrokeDashArray().addAll(5d, 5d);
                        break;
                }

                rec.setStroke(colorPicker.getValue());
                rec.setFill(Color.rgb(127, 127, 127));
                Rectangle rext = rec;
                rext.setOnMouseClicked(mouse -> {
                    if (mouse.getButton() == MouseButton.SECONDARY) {
                        FileChooser fileChooser = new FileChooser();
                        fileChooser.getExtensionFilters().add(new FileChooser.ExtensionFilter("all", "*.*"));
                        File file = fileChooser.showOpenDialog(IPOG_Zkouska_CtverceSobrazkem.stage);
                        if(Objects.nonNull(file)) {
                            Image newImage = new Image(file.toURI().toString());
                            if (Objects.isNull(newImage) || newImage.isError()) {
                                Alert alert = new Alert(Alert.AlertType.ERROR);
                                alert.setHeaderText(null);
                                alert.setContentText("Neplaný soubor!");
                                alert.showAndWait();
                            } else {
                                ImageView iv = new ImageView(newImage);
                                iv.setFitHeight(rext.getHeight());
                                iv.setFitWidth(rext.getWidth());
                                rext.setFill(new ImagePattern(iv.getImage()));
                            }

                        }
                    }
                });


                pane.getChildren().add(rext);
                obdelniky.add(rext);

            }


    }

    private void doGradient() {
        Stop stops[] = {new Stop(0, Color.WHITE),
//            new Stop(0.25, Color.GREEN),
//            new Stop(0.5, Color.WHITE),
//            new Stop(0.75, Color.GREEN),
            new Stop(1, Color.BLUE)};



        LinearGradient grad = new LinearGradient(0, 1, 1, 1, true, CycleMethod.NO_CYCLE, stops);
        pane.setBackground(new Background(new BackgroundFill(grad, CornerRadii.EMPTY, Insets.EMPTY)));
    }

}