$***$JavaFX$***$ I am trying to make the image bounce around the pane indefinitely, all I can get it to do is either shake or fly off the screen. Help!

import java.io$.$FileInputStream;

import java.io$.$FileNotFoundException;

import java.io$.$InputStream;

import javafx.animation.KeyFrame;

import javafx.animation.Timeline;

import javafx.application.Application;

import javafx.event.ActionEvent;

import javafx.event.EventHandler;

import javafx.stage.Stage;

import javafx.scene.Scene;

import javafx.scene.layout.Pane;

import javafx.scene.image.Image;

import javafx.scene.image.ImageView;

import javafx.util.Duration;

public class Jthomas$270$M$6$A$3$ extends Application$\{$

@Override

public void start$($Stage primaryStage$)$ throws FileNotFoundException$\{$

InputStream catGraphic $=$ new FileInputStream$("$src$/$Graphics$/$Black$\_$Cat.png$")$;

Image cat $=$ new Image$($catGraphic$)$;

ImageView viewableCat $=$ new ImageView$($cat$)$;

viewableCat.setFitHeight$(100)$;

viewableCat.setFitWidth$(100)$;

viewableCat.setX$(100)$;

viewableCat.setY$(100)$;

Pane pane $=$ new Pane$()$;

pane.getChildren$().$add$($viewableCat$)$;

Timeline animation $=$ new Timeline$($new KeyFrame$($Duration$.$millis$(100),$ new EventHandler$()\{$

double dx $=1,$ dy $=1$;

@Override

public void handle$($ActionEvent e$)\{$

viewableCat.setX$($viewableCat$.$getX$()+$ dx$)$;

viewableCat.setY$($viewableCat$.$getY$()+$dy$)$;

if$($viewableCat$.$getFitWidth$()!=$ pane.getWidth$())\{$

dx $*=-1$;

$\}$

if$($viewableCat$.$getFitHeight$()!=$ pane.getHeight$())\{$

dy $*=-1$;

$\}$

viewableCat.setX$($dx$)$;

viewableCat.setY$($dy$)$;

$\}$

$\}))$;

animation.setCycleCount$($Timeline$.$INDEFINITE$)$;

animation.play$()$;

Scene scene $=$ new Scene$($pane$,800,600)$;

primaryStage.setTitle$("$Bouncing Cat"$)$;

primaryStage.setScene$($scene$)$;

primaryStage.show$()$;

$\}$

public static void main$($String$[]$ args$)\{$

launch$($args$)$;

$\}$

$\}$