Java tutorial
import javafx.application.Application; import javafx.beans.binding.Bindings; import javafx.scene.Group; import javafx.scene.Scene; import javafx.scene.shape.Circle; import javafx.stage.Stage; public class Main extends Application { public static void main(String[] args) { Application.launch(args); } @Override public void start(Stage stage) { Circle c = new Circle(); Group root = new Group(c); Scene scene = new Scene(root, 100, 100); c.centerXProperty().bind(scene.widthProperty().divide(2)); c.centerYProperty().bind(scene.heightProperty().divide(2)); c.radiusProperty().bind(Bindings.min(scene.widthProperty(), scene.heightProperty()).divide(2)); stage.setTitle("A Centered Circle"); stage.setScene(scene); stage.sizeToScene(); stage.show(); } }