倾听变革的变化
问题描述：
有没有办法听转型的变化?我想在例如多维数据集打开时得到通知.特别是我对getLocalToSceneTransform感兴趣.
Is there way to listen for transformation changes? I'd like to get notified when for example a cube has turned. Especially I'am interested in getLocalToSceneTransform.
这是我的尝试:
@Override
public void start(Stage primaryStage) throws Exception {
final Group root = new Group();
final Scene scene = new Scene(root);
final Box cube = new Box(1, 1, 1);
cube.setRotationAxis(Rotate.Y_AXIS);
cube.setMaterial(new PhongMaterial(Color.RED));
root.getChildren().add(cube);
cube.getLocalToSceneTransform().addEventHandler(TransformChangedEvent.TRANSFORM_CHANGED, (e) -> {
// never get called
System.out.println("Transformation has changed");
});
final Camera camera = new PerspectiveCamera(true);
camera.setTranslateZ(-4);
scene.setCamera(camera);
final Timeline turnCube = new Timeline();
turnCube.getKeyFrames().add(new KeyFrame(Duration.seconds(0), new KeyValue(cube.rotateProperty(), 0)));
turnCube.getKeyFrames().add(new KeyFrame(Duration.seconds(5), new KeyValue(cube.rotateProperty(), 360)));
turnCube.setCycleCount(Timeline.INDEFINITE);
turnCube.play();
primaryStage.setWidth(1024);
primaryStage.setHeight(768);
primaryStage.setScene(scene);
primaryStage.show();
}
在旋转多维数据集时，EventHandler永远不会被调用.
While the cube is turned the EventHandler get never called.
答
您可以将changeListener添加到多维数据集的localToSceneTransformProperty()中，以便在旋转多维数据集时得到通知.
You can add a changeListener to the cube's localToSceneTransformProperty() to get notified when the cube is rotated.
cube.localToSceneTransformProperty().addListener((value, oldValue, newValue) -> {
System.out.println("Transformation has changed");
});