利用javaFX实现移动一个小球的示例代码
题目：编写一个程序，在面板上移动小球。应该定义一个面板类来显示小球，并提供向上下左右移动小球的方法。请进行边界检查以防止小球移动到视线之外。
问题：我写的程序可以运行但是无法显示小球的移动，如果将移动改为改变小球颜色则可以显示，检查许久也检查不到问题在哪，所以贴上来问问大佬们，问题出在哪里？应该如何改？
代码如下：
publicclassMoveBall_3extendsApplication{
privateCirclePanecirclePane=newCirclePane(250,250);
publicstaticvoidmain(String[]args){
Application.launch(args);
}
publicvoidstart(StageprimaryStage)throwsException{
Buttonbt1=newButton("Left");
Buttonbt2=newButton("Right");
Buttonbt3=newButton("Up");
Buttonbt4=newButton("Down");
bt1.setOnAction(newEventHandler(){
@Override
publicvoidhandle(ActionEventevent){
//TODO自动生成的方法存根
circlePane.moveLeft();
}
});
bt2.setOnAction(newEventHandler(){
@Override
publicvoidhandle(ActionEventevent){
//TODO自动生成的方法存根
circlePane.moveRight();
}
});
bt3.setOnAction(newEventHandler(){
@Override
publicvoidhandle(ActionEventevent){
//TODO自动生成的方法存根
circlePane.moveUp();
}
});
bt4.setOnAction(newEventHandler(){
@Override
publicvoidhandle(ActionEventevent){
//TODO自动生成的方法存根
circlePane.moveDown();
}
});
FlowPanepane2=newFlowPane();
pane2.getChildren().addAll(bt1,bt2,bt3,bt4);
circlePane.getChildren().addAll(pane2);
Scenescene=newScene(circlePane,500,500);
primaryStage.setTitle("MoveBall");
primaryStage.setScene(scene);
primaryStage.show();
}
}
classCirclePaneextendsStackPane{
privateCirclecircle=newCircle(250,250,50);
publicCirclePane(){
getChildren().add(circle);
circle.setStroke(Color.BLACK);
circle.setFill(Color.WHITE);
}
publicCirclePane(doublea,doubleb){
getChildren().add(circle);
circle.setCenterX(a);
circle.setCenterY(b);
circle.setStroke(Color.BLACK);
circle.setFill(Color.WHITE);
}
publicvoidmoveLeft(){
if(circle.getCenterX()-50-15>=0){
circle.setCenterX(circle.getCenterX()-15);
circle.setCenterY(circle.getCenterY());
}
else{
circle.setCenterX(50);
circle.setCenterY(circle.getCenterY());
}
}
publicvoidmoveRight(){
if(circle.getCenterX()+50+15<=500){
circle.setCenterX(circle.getCenterX()+15);
circle.setCenterY(circle.getCenterY());
}
else{
circle.setCenterX(450);
circle.setCenterY(circle.getCenterY());
}
}
publicvoidmoveUp(){
if(circle.getCenterY()-50-15>=0){
circle.setCenterY(circle.getCenterY()-15);
circle.setCenterX(circle.getCenterX());
}
else{
circle.setCenterY(50);
circle.setCenterX(circle.getCenterX());
}
}
publicvoidmoveDown(){
if(circle.getCenterY()+50+15<=500){
circle.setCenterY(circle.getCenterY()+15);
circle.setCenterX(circle.getCenterX());
}
else{
circle.setCenterY(450);
circle.setCenterX(circle.getCenterX());
}
}
}
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