我在摆动应用程序中让我的马位置更新时遇到问题。我尝试了多种方法来更新马的xPosition，因为它们在代表赛道的秋千面板上刷新。
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);
}
}
}
答案 0 :(得分：3)
您的代码问题：