java - 单击Java时绘制多辆车

Question

我已经编写了一个程序，当我单击鼠标按钮时绘制 1 辆汽车，现在我想在第二次单击鼠标按钮时再绘制 1 辆汽车。

@SuppressWarnings("serial")

公共(public)类 CarMove 扩展 JComponent

{

private volatile boolean drawCar = false;
private volatile boolean drawCar1 = false;

private int lastX = 0;
private int clickCount = 0;

{
    FrameMouseListener listener = new FrameMouseListener();
    super.addMouseListener(listener);
}

public CarMove() 
{
    Thread animationThread = new Thread(new Runnable() 
    {
        public void run() 
        {
            while (true) 
            {
                repaint();
                try 
                {
                    Thread.sleep(10);

                } catch (Exception ex) {}
            }
        }
    });

    animationThread.start();
}
public void paintComponent(Graphics g)
{

     Graphics2D g2 = (Graphics2D) g;

     if (drawCar) 
     {
         int x = 1;
         int carSpeed = 1;
         int w = getWidth(); 
         x = lastX + carSpeed;
        //create the car from draw class
         Car car1 = new Car(x,320);
         car1.draw(g2);   
         lastX = x; 
     }   
     if (drawCar1) 
     {
         int x = 1;
         int carSpeed = 1;
         int w = getWidth(); 
         x = lastX + carSpeed;
        //create the car from draw class
         Car car2 = new Car(x,320);
         car2.draw(g2);   
         lastX = x; 
     }   
}
public class FrameMouseListener implements MouseListener
{

    @Override
    public void mouseClicked(MouseEvent ev) 
    {
        if (clickCount == 1)
        {
            drawCar = true;
            repaint();  
        }
        if (clickCount == 2)
        {
            drawCar1 = true;
            repaint();
        }

    }

我尝试创建 boolean 绘图两次，但没有成功，请帮助我。

Answer 1

如果您需要知道用户单击鼠标按钮的次数。

@Override
    public void mouseReleased(MouseEvent m) {
        int clickCount = m.getClickCount();

        //change your code to do draw the cars based on clicks
    }

编辑:

当你调用重绘方法时，第一行必须是:

super.repaint();

要绘制多辆汽车，您必须在调用 paint(Graphics g) 时使用循环，如下所示:

public void paintComponent(Graphics g){
    super.repaint();

   Graphics2D g2 = (Graphics2D) g;

   for(int car=0; car<totalClicks; car++){

    //Here add your code to draw the cars
    if(car==1){
       //do this
    }else if(car==2){
       //do that
    }else if(car== 3){
       //do more
    }else if(car==4){
       //hard job 
    }//etc

 }