JavaFX imageview真实坐标translateX和translateY

问题描述

为什么translateX和translateY在我的场景中位置不好？我开始坐标x = 100 y = 200 in real my real coordinate y = -24.8 ...为什么？我的ImageView是什么时候需要真正的坐标？

And why the translateX and translateY is bad position on my scene ? I start on coordinate x = 100 y = 200 in real my real coordinate y = -24.8 ... why ? I need real coordinates when is my ImageView is ?

    primaryStage.setTitle("Title");
    Group root = new Group();
    Scene scene = new Scene(root, 800, 600, Color.WHITE);

   // border.prefHeightProperty().bind(scene.heightProperty());
    //border.prefWidthProperty().bind(scene.widthProperty());
    Image im = new Image("Images/universe.jpg", 800, 600, true, true);
    ImageView iv = new ImageView(im);

    Image iv1 = new Image("Images/Asteroid.png", 60, 50, false, false);
    ImageView iv2 = new ImageView(iv1);
    iv2.setX(100);
    iv2.setY(200);

    Path p = new Path();
    p.getElements().add(new MoveTo(100, 200));
    p.getElements().add(new LineTo(200, 400));
    PathTransition pt = new PathTransition(Duration.millis(10000), p);
    pt.setNode(iv2);
    root.getChildren().add(iv2);
    DoubleProperty xValue = new SimpleDoubleProperty();
    xValue.bind(iv2.translateXProperty());
    xValue.addListener(new ChangeListener() {

        @Override
        public void changed(ObservableValue ov, Object t, Object t1) {
         //   System.out.println((double) t1);
        }
    });
       DoubleProperty yValue = new SimpleDoubleProperty();
    yValue.bind(iv2.translateYProperty());
    yValue.addListener(new ChangeListener() {

        @Override
        public void changed(ObservableValue ov, Object t, Object t1) {
            System.out.println((double) t1);
        }
    });
    pt.play();
    primaryStage.setScene(scene);
    primaryStage.show();
}

推荐答案

我不知道是什么真实坐标是指：您想要的坐标系（屏幕，场景，父节点，节点......）？

I don't know what "real coordinate" means: which coordinate system are you wanting (screen, scene, parent, node...)?

您显示的值是 translateY property;它是节点垂直平移的量。所以-24.8意味着它从原来的位置上移了24.8个单位。

The value you are displaying is the translateY property; it's the amount by which the node is translated vertically. So -24.8 means it's moved 24.8 units up from its original position.

你可以查看 boundsInParent 属性，它告诉您父级坐标系中节点的边界，包括任何变换（例如转换）。 boundsInLocal 属性是其自身坐标系中节点的边界，不包含任何变换。

You can look at the boundsInParent property, which tells you the bounds of the node in the parent's coordinate system, including any transforms (such as the translation). The boundsInLocal property is the bounds of the node in its own coordinate system, and doesn't include any transforms.

如果要在场景或屏幕坐标中获取节点的边界，可以使用众多 localToScene（...）或中的一个> localToScreen（...）要转换的方法。

If you want to get the bounds of the node in scene or screen coordinates, you can use one of the many localToScene(...) or localToScreen(...) methods to convert.

更新：例如，要跟踪的界限在场景坐标中的图像，您可以执行以下操作：

Update: For example, to track the bounds of the image in scene coordinates, you can do something like:

ChangeListener<Number> listener = new ChangeListener<Number>() {
    @Override
    public void changed(ObservableValue<? extends Number> ov, Number oldValue, Number newValue) {
        Bounds boundsInScene = iv2.localToScene(iv2.getBoundsInLocal());
        double xInScene = boundsInScene.getMinX();
        double yInScene = boundsInScene.getMinY();
        // do something with values...
    }
});
iv2.translateXProperty().addListener(listener);
iv2.translateYProperty().addListener(listener);

阅读了解更多详情。

Read the Javadocs for Node for more details.

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