JavaFX 鼠标位置

Question

我需要在我的应用程序中获取鼠标点击的 x 和 y 坐标。我通过创建一个点在下面的代码中部分解决了它，但我不断获得不同的坐标，具体取决于我在屏幕上移动应用程序的 window 的位置。以后我需要一些常量来识别某些对象。感谢您的帮助！

    @Override
    public void start(Stage stage) throws Exception {

        final Pane root = new Pane();
        setWidth(1400);
        setHeight(1000);
        Canvas background = new Canvas(getWidth(), getHeight());

        final GraphicsContext context = background.getGraphicsContext2D();
        File f = new File("background.png");
        final Image image = new Image(new FileInputStream(f));

        root.getChildren().add(background);


        root.getChildren().add(b1);
        b1.setLayoutX(1300);
        b1.setLayoutY(10);


        final Canvas animation = new Canvas(getWidth(), getHeight());
        final Canvas animation2 = new Canvas(getWidth(), getHeight());

        animation.setMouseTransparent(true);
        animation2.setMouseTransparent(true);
        final GraphicsContext context2 = animation.getGraphicsContext2D();
        final GraphicsContext context3 = animation2.getGraphicsContext2D();

        root.getChildren().add(animation);
        root.getChildren().add(animation2);

        Scene scene = new Scene(root, getWidth(), getHeight());

        stage.setTitle("Old Gotham");
        stage.setScene(scene);
        stage.show();

        final Duration oneFrameAmt = Duration.millis(1000 / 60);
        final KeyFrame oneFrame;
        oneFrame = new KeyFrame(oneFrameAmt,
                new EventHandler() {
                    @Override
                    public void handle(Event event) {

                        context2.drawImage(image, 0, 0);
                        int offset = 700;

                        final Point p = MouseInfo.getPointerInfo().getLocation();

                        root.setOnMouseClicked(new EventHandler<Event>() {
                            @Override
                            public void handle(Event event) {
                                System.out.println(p.getX());
                                System.out.println(p.getY());
                            }
                        });

                    }
                });
        final Timeline tl = new Timeline(oneFrame);
        tl.setCycleCount(Animation.INDEFINITE);
        tl.play();
    }

对于James_D给出的代码，有一个错误：

Answer 1

我不明白你为什么要在关键帧的监听器中设置鼠标监听器，但你需要从鼠标事件中获取坐标。

MouseEvent定义getX()和getY()获取鼠标事件相对于节点本身的坐标，getSceneX()和getSceneY()获取鼠标事件相对于整个Scene的坐标，和（在Java8）getScreenX()和getScreenY()得到鼠标事件相对于entrie屏幕坐标的坐标系统.

因此，如果您对鼠标相对于 window（场景）的位置感兴趣，请执行

root.setOnMouseClicked(new EventHandler<MouseEvent>() {
    @Override
    public void handle(MouseEvent event) {
        System.out.println(event.getSceneX());
        System.out.println(event.getSceneY());
    }
});

Answer 2

这将提供更准确的鼠标点坐标..

root.setOnMouseClicked(new EventHandler<MouseEvent>() 
{
  @Override
  public void handle(MouseEvent event) {
    System.out.println(event.getScreenX());
    System.out.println(event.getScreenY());
  }
});

JavaFX 鼠标位置

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