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:
public class MoveBall_3 extends Application{ private CirclePane circlePane = new CirclePane(250,250); public static void main(String[] args) { Application.launch(args); } public void start(Stage primaryStage) throws Exception { Button bt1 = new Button("Left"); Button bt2 = new Button("Right"); Button bt3 = new Button("Up"); Button bt4 = new Button("Down"); bt1.setOnAction(new EventHandler<ActionEvent>(){ @Override public void handle(ActionEvent event) { // TODO 自动生成的方法存根 circlePane.moveLeft(); } }); bt2.setOnAction(new EventHandler<ActionEvent>() { @Override public void handle(ActionEvent event) { // TODO 自动生成的方法存根 circlePane.moveRight(); } }); bt3.setOnAction(new EventHandler<ActionEvent>() { @Override public void handle(ActionEvent event) { // TODO 自动生成的方法存根 circlePane.moveUp(); } }); bt4.setOnAction(new EventHandler<ActionEvent>() { @Override public void handle(ActionEvent event) { // TODO 自动生成的方法存根 circlePane.moveDown(); } }); FlowPane pane2 = new FlowPane(); pane2.getChildren().addAll(bt1,bt2,bt3,bt4); circlePane.getChildren().addAll(pane2); Scene scene = new Scene(circlePane,500,500); primaryStage.setTitle("MoveBall"); primaryStage.setScene(scene); primaryStage.show(); } } class CirclePane extends StackPane{ private Circle circle = new Circle(250,250,50); public CirclePane() { getChildren().add(circle); circle.setStroke(Color.BLACK); circle.setFill(Color.WHITE); } public CirclePane(double a,double b) { getChildren().add(circle); circle.setCenterX(a); circle.setCenterY(b); circle.setStroke(Color.BLACK); circle.setFill(Color.WHITE); } public void moveLeft() { if(circle.getCenterX()-50-15 >= 0) { circle.setCenterX(circle.getCenterX()-15); circle.setCenterY(circle.getCenterY()); } else { circle.setCenterX(50); circle.setCenterY(circle.getCenterY()); } } public void moveRight() { if(circle.getCenterX()+50+15 <= 500) { circle.setCenterX(circle.getCenterX()+15); circle.setCenterY(circle.getCenterY()); } else { circle.setCenterX(450); circle.setCenterY(circle.getCenterY()); } } public void moveUp() { if(circle.getCenterY()-50-15 >= 0) { circle.setCenterY(circle.getCenterY()-15); circle.setCenterX(circle.getCenterX()); } else { circle.setCenterY(50); circle.setCenterX(circle.getCenterX()); } } public void moveDown() { 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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