Java 摇摆马模拟

Question

我无法在我的挥杆应用程序中更新我的马匹位置。我尝试了多种方法来更新马匹的 xPosition，因为它们在代表赛道的挥杆面板上刷新。

public class HorseModel{

    /*Horse dimensions*/
    private int x;
    private int y;
    private final int horsePerimeter = 20;

    public HorseModel(int xT, int yT){
    /*Constructor*/
        x = xT;
        y = yT;
    }
    public void setDimensions(int dimX, int dimY){
    /*Sets program dimensions*/
        x = dimX;
        y = dimY;
    }
    public void createHorse(Graphics2D h){
    /*Paints HorseModel on screen as 2 dimensional object*/

        Ellipse2D.Double horseModel = new Ellipse2D.Double(x, y, horsePerimeter, horsePerimeter);
        h.setColor(Color.RED);
        h.fill(horseModel);
        h.setColor(Color.YELLOW);
        h.draw(horseModel);
    }
}
public class HorseMovement implements Runnable{

    public final int xStartPos = 10; //change
    public final int yStartPos = 20;

    private RaceTrack hRaceTrack;
    private HorseModel Horse2D;
    private int xPos, yPos;

    public HorseMovement(RaceTrack r, int yPos_Spacing){
    /*Constructor*/
        xPos = xStartPos;
        yPos = yStartPos * yPos_Spacing;
        Horse2D = new HorseModel(xPos, yPos);
        hRaceTrack = r;
    }
    public HorseModel moveHorse(HorseModel horseObject){
    /*Updates horse positon*/
        horseObject = new HorseModel(xPos++, yPos);
        return horseObject;
    }
    public void paintComponent(Graphics h){
    /*paints the new horse after movement*/
        this.Horse2D = moveHorse(Horse2D);
        Graphics2D hMod = (Graphics2D) h;
        Horse2D.createHorse(hMod);
    }
    public void run(){
    /*Repaints the horse models as they increment movement across the screen*/
        hRaceTrack.repaint();
        hRaceTrack.revalidate();
    }
}
public class RacePanel extends JFrame{

    /*Frame Buttons*/
    private JPanel mPanel;
    private JButton startRace = new JButton("Start Race");
    private JButton stopRace = new JButton("Stop Race");
    private JButton startOver = new JButton("Start Over");


    /*Panel to fill with HorseModels for race*/
    private RaceTrack rTrack;

    /*Window dimensions*/
    public int Window_Height = 1024;
    public int Window_Width = 768;

    public RacePanel(){
    /*Constructor*/

        initGui();
        initRace();
        initQuit();

        setSize(Window_Width, Window_Height);
    }
    public void initGui(){
    /*Initializes the main race panel and sets button positions and layouts*/
        mPanel = new JPanel(new BorderLayout());
        rTrack = new RaceTrack();

        JPanel horsePanel = new JPanel(); //panel to house horse objects before running across screen

        horsePanel.setLayout(new GridLayout(1, 3));

        positionJPanels(horsePanel, mPanel);
    }
    public void initRace(){
    /*implements action listener for start race button*/
        class StartRace implements ActionListener{
            public void actionPerformed(ActionEvent e){
                startRace.setEnabled(true);
                rTrack.initTrack();
            }
        }
        ActionListener event = new StartRace();
        stopRace.addActionListener(event);
    }
    public void initQuit(){
    /*Implements the action listener for stop race button*/
        class StopRace implements ActionListener{
            public void actionPerformed(ActionEvent e){
                System.exit(0);//exits program if race is stopped
            }
        }
        ActionListener event = new StopRace();
        stopRace.addActionListener(event);
    }
    public void positionJPanels(JPanel h, JPanel p){
    /*Handles adding buttons to a JPanel*/
        h.add(startRace);
        h.add(startOver);
        h.add(stopRace);

        p.add(h, BorderLayout.NORTH); //sets the horse panel buttons to the top of the layout
        p.add(rTrack, BorderLayout.CENTER); //sets

        add(p);
    }
}

public class RaceController {

    public static void main(String[] args){
        new RaceController();
    }
    public RaceController(){
    /*Constructor*/
        JFrame mFrame = new RacePanel();
        mFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        mFrame.setVisible(true);
    }

}
public class RaceTrack extends JPanel{

    /*Sets horses within race track*/
    private int numOfHorseObjects = 5;// change this to a dynamic
    private int numOfThreads = 25;

    /*Holds horse thread from HorseObject class*/
    private ArrayList<HorseMovement> horses = new ArrayList<>();
    private ArrayList<Thread> threads = new ArrayList(numOfThreads);

    public RaceTrack(){
    /*Constructor*/
        setBackground(Color.black);
        reset();
    }
    public void initTrack(){
    /*Starts the RaceTrack simulation*/
        threads.clear(); //clears the thread arraylist still residing

        for(int i = 0; i < horses.size(); i++){
            Thread T = new Thread(horses.get(i));
            T.start();
            threads.add(T);
        }
    }
    public void reset(){
    /*resets horse position within screen*/
        horses.clear();
        for(int i = 0; i < numOfHorseObjects; i++){
            horses.add(new HorseMovement(this, i + 1));
        }
    }
    public void paintComponent(Graphics g){
    /*overrides graphics paint method in order to paint the horse movements
    * through the arraylist of HorseMovements*/
        super.paintComponent(g);
        for(HorseMovement h : horses){
            h.paintComponent(g);
        }
    }
}

Answer 1

您的代码有问题：

您从来没有给 startRace JButton 一个 ActionListener，那么按钮将如何产生影响，比赛将如何开始？请注意，您正在将 StartRace ActionListener 对象添加到 stopRace JButton，我猜这是错误的。
即使您将该侦听器添加到 startRace 按钮，动作侦听器也只会让所有马匹前进一匹 "step" 而不会更多——您的后台线程中没有循环来重复执行动作。
您似乎在不必要地创建新的 Horse2D 对象。为什么不简单地推进现有 Horse2D 对象的位置？
我自己，为了简化代码，我会使用单个 Swing Timer 而不是一堆线程。

Java 摇摆马模拟

Java Swing Horse Simulation

java

multithreading

swing

simulation