JavaFX MousePosition [英] JavaFX MousePosition

问题描述

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地解决了它，但我不断得到不同的坐标，具体取决于我在屏幕上移动应用程序窗口的位置。我需要一些不变的东西来识别某些后来的东西。感谢您的帮助！

I need to get x and y coordinates of a mouseclick in my application. I partially solved it in the code below by creating a point but I keep getting different coordinates depending on where I move a window of my application on the screen. I would need something constant to identify certain obejcts later. Thank you for your help!

    @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提供的代码，有一个错误：

For the code presented by James_D, there is an error:

推荐答案

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。

I don't understand why you are setting the mouse listener inside the listener for a key frame, but you need to get the coordinates from the mouse event.

MouseEvent 定义 getX（）和 getY（）到获取鼠标事件相对于节点本身的坐标， getSceneX（）和 getSceneY（）获取坐标鼠标事件相对于整个场景和（在Java 8中） getScreenX（）和 getScreenY（）获取相对于entrie屏幕坐标系的鼠标事件的坐标。

MouseEvent defines getX() and getY() to get the coordinates of the mouse event relative to the node itself, getSceneX() and getSceneY() to get the coordinates of the mouse event relative to the whole Scene, and (in Java 8) getScreenX() and getScreenY() to get the coordinates of the mouse event relative to the entrie screen coordinate system.

所以，如果你'对鼠标相对于窗口（场景）的位置感兴趣，请

So, if you're interested in the location of the mouse relative to the window (scene), do

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

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