填充按鈕和矩形

Question

我的按鈕位於矩形下。它目前就像在左邊的圖片中。我想按照右邊的圖片來填充按鈕。
我該怎麼做？謝謝閱讀。
這是我的代碼。

public class Rect extends Application { 
    private Button btn1 = new Button("Rotate"); 
    private Rectangle r1 = new Rectangle(50, 100); 
    @Override 
    public void start(Stage primaryStage) throws Exception { 
     GridPane gridPane = new GridPane(); 
     r1.setStroke(Color.BLACK); 
     r1.setFill(Color.WHITE); 
     gridPane.add(r1, 0, 0); 
     gridPane.add(btn1, 0, 1); 

     gridPane.setAlignment(Pos.CENTER); 
     btn1.setAlignment(Pos.BOTTOM_CENTER); 

     Scene scene = new Scene(gridPane,200,200); 
     primaryStage.setTitle("RotateRectangleFX"); 
     primaryStage.setScene(scene); 
     primaryStage.show(); 

    } 

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

} 

Answer 1

此刻的你正在做這件事：

gridPane.setAlignment(Pos.CENTER); 
btn1.setAlignment(Pos.BOTTOM_CENTER); 

您應該設置的r1對齊，而不是像如下：

r1.setAlignment(Pos.CENTER); 
btn1.setAlignment(Pos.BOTTOM_CENTER);