我在JavaFX中对此圈子设置动画时遇到问题

Question

我正在使用JavaFX和AnimationTimer来使圆圈移动到通过单击圆圈触发的随机位置。我看到的问题是圆圈不会朝屏幕的右上角或右下角移动，我不确定为什么。

这是我的代码：

import javafx.animation.AnimationTimer;
import javafx.application.Application;
import javafx.scene.layout.*;
import javafx.scene.shape.*;
import javafx.stage.*;
import javafx.scene.paint.*;
import java.util.*;
import javafx.scene.*;
import javafx.animation.AnimationTimer;

public class MovingCircle extends Application {
    double WIDTH = 800;
    double HEIGHT = WIDTH;

    class TheCircle extends Circle {
        public TheCircle(){
            super();
            setFill(Color.GREEN);
            setCenterX(WIDTH / 2);setCenterY(HEIGHT / 2);
            setRadius(50);
            setOnMouseClicked(event -> {
                double newX = random(50, HEIGHT - 50); double newY = random(50, WIDTH - 50);
                move(newX, newY);
            });
        }
        void move(double newX, double newY){
            double xVelocity;
            double yVelocity;
            if (newX == getCenterX()){
                xVelocity = 0;
            }else {
                xVelocity = getCenterX() < newX ? 1 : -1;
            }
            if (newY == getCenterY()){
                yVelocity = 0;
            }else {
                yVelocity = getCenterY() < newY ? 1 : -1;
            }
            AnimationTimer h = new AnimationTimer() {
                @Override
                public void handle(long l) {
                    setCenterY(getCenterX() + xVelocity);
                    setCenterX(getCenterY() + yVelocity);
                    //System.out.println(getCenterX() + ", " + getCenterY() + " ; " + newX + ", " + newY);
                    if (getCenterX() == newX && getCenterY() == newY){
                        this.stop();
                    }
                }
            };
            System.out.println("begin!");
            h.start();
        }
    }

    public void start(Stage stage){
        Pane root = new Pane();
        TheCircle mover = new TheCircle();
        root.getChildren().add(mover);
        stage.setScene(new Scene(root, WIDTH, HEIGHT));
        stage.show();
    }

    public static void main(String[] args){
        launch(args);
    }

    double random(double min, double max){
        return Math.floor(Math.random() * (max - min + 1) + min);
    }
}

看来，如果我强迫xVelocity和yVelocity使圆朝这些区域设置动画，则圆要么停滞不前，要么窗口冻结。我该如何解决这个问题？