如何将图像视图置于锚窗格中心？

Question

I am using scene builder to create my GUI and I am displaying Image s as users select items in a list. The Image s are of different sizes and when an Image that is smaller than the pane it is in, the image is displayed in the top left of the pane. How do I go about getting the ImageView and/or Image to be displayed in the center of the Pane ?

I've looked throughout the javafx imageview and image APIs but I haven't found much on centering the ImageView in a Pane . I haven't seen anything in scene builder, either. Usually in scene builder, if there is a way to center a node, there will be an option for centering.

Answer 1

In any kind of pane its now possible to set image alignment in specific postion.. for this you can use try HBox

when you insert an Image into the HBox , initially its shown like below.

now set the alignment property of the HBox

now change the alignment to centre and see the output

I hope its work for you

Its also possible to do so programmatically in a Pane via get image

try this

AnchorPane anchorPane = new AnchorPane();
Image img = new Image(getClass().getResourceAsStream("Edit-Male-User-icon.png"));
ImageView imageView = new ImageView(img);
anch.getChildren().add(imageView );
ImageView app = (ImageView) (Node) anchorPane.getChildren().get(0);
app.setX(100);
app.setY(100);

Answer 2

Create a Group and scene in your start method:

Group root = new Group();
Scene scene = new Scene(root, 551, 400, Color.BLACK);
primaryStage.setScene(scene);

Create an ImageView and set the following properties:

ImageView imageView = new ImageView();
// set aspect ratio
imageView.setPreserveRatio(true);
// resize based on the scene
imageView.fitWidthProperty().bind(scene.widthProperty());
imageView.fitHeightProperty().bind(scene.heightProperty());

Create a StackPane (at least that is what I used) and bind your properties:

StackPane stack = new StackPane();
stack.getChildren().add(imageView);

    stack.translateXProperty()
            .bind(scene.widthProperty().subtract(stack.widthProperty())
                    .divide(2));

    stack.translateYProperty()
            .bind(scene.heightProperty().subtract(stack.heightProperty())
                    .divide(2));

Add this stack to root element:

root.getChildren().add(stack);

Show primaryStage and execute other code in your start method:

primaryStage.show();

Answer 3

A simple way to make small images dynamically centered :

import javafx.application.Application;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;

public class CenterInStage extends Application {

    private final String TITLE = "Center in Stage";
    private final double WIDTH = 350;
    private final double HEIGHT = 250;
    private final String IMAGE_PATH =
            "http://icons.iconarchive.com/icons/iconka/meow-2/64/cat-rascal-icon.png";

    @Override
    public void start(Stage primaryStage) {

        primaryStage.setTitle(TITLE);

        Image image = new Image(IMAGE_PATH);
        ImageView imageView = new ImageView(image);
        imageView.setPreserveRatio(true);

        StackPane pane = new StackPane();
        pane.getChildren().add(imageView);
        StackPane.setAlignment(imageView, Pos.CENTER);

        Scene scene = new Scene(pane, WIDTH, HEIGHT);

        primaryStage.setScene(scene);
        primaryStage.show();
    }

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