This bug is hard to describe.

In JavaFX 2.2 the red rectangle animates from its current translateY position to the new one.

Whereas in JavaFX 8 it always starts from y position = 0 and then translates from there to its new y position.
If I explicitly set the fromY to the current y value it is better, but it flickers a lot.


Better you just have a look at this code and running it with JavaFX 2.2 and then JavaFX 8.0.

import javafx.animation.SequentialTransition;
import javafx.animation.TranslateTransition;
import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.paint.Color;
import javafx.scene.shape.Rectangle;
import javafx.stage.Stage;
import javafx.util.Duration;

public class TestApp5 extends Application {
    public static void main(String[] args) {
        Application.launch();
    }

    private int y = 1;

    @Override
    public void start(Stage stage) throws Exception {
        Rectangle rectangle = new Rectangle(50, 50, Color.RED);

        final SequentialTransition sequentialTransition = new SequentialTransition();
        final TranslateTransition translateTransition = new TranslateTransition(Duration.seconds(1), rectangle);
        translateTransition.setToY(y * 10);

        sequentialTransition.getChildren().addAll(translateTransition);

        Group group = new Group();
        group.getChildren().add(rectangle);

        sequentialTransition.setOnFinished(new EventHandler<ActionEvent>() {
            @Override
            public void handle(ActionEvent actionEvent) {
                // This line helps a little bit, but there's still a lot of flickering.
                // And it wasn't needed in JavaFX 2.2.
                //translateTransition.setFromY(y * 10);
                translateTransition.setToY(++y * 10);
                sequentialTransition.playFromStart();
            }
        });
        sequentialTransition.playFromStart();

        Scene scene = new Scene(group, 500, 500);
        stage.setScene(scene);
        stage.show();
    }
}