java - 将方 block 添加到动画中

Question

1. 我正在尝试创建一个程序来运行类似于 this video 上的动画。但我在添加更多方 block 时遇到问题。我尝试将所有方 block 添加到数组列表中，但我无法弄清楚它去了哪里。

2. 到目前为止，这是我的代码:

   public class Animation extends JFrame{
   
   CrazySquares square = new CrazySquares();
   
   Animation(){
   
   add(new CrazySquares());
   }
   
   public static void main (String[] args){
   
   Animation frame = new  Animation();
   frame.setTitle("AnimationDemo");
   frame.setLocationRelativeTo(null); // Center the frame
   frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   frame.setSize(250, 250);
   frame.setVisible(true);
   }
   }
   
   class CrazySquares extends JPanel{
   
   
   private final int numberOfRectangles=100;
   
       Color color=new Color((int)(Math.random()*256),(int)(Math.random()*256),(int)(Math.random()*256));
   
        private int x=1;
          private int y=1;
       private Timer timer = new Timer(30, new TimerListener());
      Random random= new Random();
           int randomNumber=1+(random.nextInt(4)-2);
   
    Random rand= new Random();
    int rando=1+(rand.nextInt(4)-2);          
   
   
      CrazySquares(){
           timer.start();
   
      }
   
    protected void paintComponent(Graphics g) {
   super.paintComponent(g);
   
    int width=getWidth();
    int height=getHeight();
   
   
             g.setColor(color);
   g.fillRect(x+width/2,y+(int)(height*.47), 20, 20);
   
   
    }
   
   
     class TimerListener implements ActionListener {
        @Override 
        public void actionPerformed(ActionEvent e) {
   
       x += rando;
       y+= randomNumber;
          repaint();
   
        }
   
   
   }
   
   }
   

Answer 1

您已经获得了绘制一个矩形的代码，如下:

int width=getWidth();
int height=getHeight();

g.setColor(color);
g.fillRect(x+width/2,y+(int)(height*.47), 20, 20);

现在我建议您将这些值移植到 Square 对象中。或者，更好的是，使用 Rectangle 对象。如果您采用自定义方法:

public class Square
{
     public Square(int x, int y, int height, int width)
     {
         // Store these values in some fields.
     }

     public void paintComponent(Graphics g)
     {
         g.fillRect() // Your code for painting out squares. 
     }
}

然后，您需要做的就是调用某个列表中每个对象的 paintComponent 方法。假设您有一些列表:

List<Square> squares = new ArrayList<Square>();


for(Square sq : squares)
{
    sq.paintComponent(g);
}