java - 在动画中添加方块

Question

1. 我正在尝试创建一个运行类似于此视频中的动画的程序，但我无法添加更多方块。我试图将所有方块添加到数组列表中，但我无法弄清楚它的去向。

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

你有代码来绘制一个矩形，在这里：

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一个Square对象中。或者，更好的是，使用Rectangle对象。如果您使用自定义方法：

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paintComponent在某个列表中调用每个对象的方法。假设您有一些列表：

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


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

Answer 2

这是到目前为止的代码。我知道这很讨厌，但这是因为我一直在尝试不同的东西，但它们都不起作用。我真的很感谢你的帮助。谢谢。@ChrisCooney

 public class SquaresAnimation extends JFrame{
  SquaresAnimation(){
      add(new CrazySquares());



}

public static void main (String[] args){
 SquaresAnimation frame = new  SquaresAnimation();
frame.setTitle("AnimationDemo");
frame.setLocationRelativeTo(null); // Center the frame
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(250, 250);
frame.setVisible(true);
 }
 }

 class Square{
 private int x;
 private int y;
 public int height;
 public int width;




  Square(int x, int y, int height, int width)
 {
     // Store these values in some fields.
     this.x=x;
     this.y=y;
     this.height=height;
     this.width=width;
 }

 public void paintComponent(Graphics g)
 {
    g.setColor(Color.CYAN);
    g.fillRect(x+width/2,y+(int)(height*.47), 20, 20); 
 }
}

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;
 Random random= new Random();
     int randomNumber=1+(random.nextInt(4)-2);

     Random rand= new Random();
     int rando=1+(rand.nextInt(4)-2);

     private Timer timer = new Timer(30, new TimerListener());

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


      CrazySquares(Graphics g){
    timer.start();

  for(Square sq : squares){

sq.paintComponent(g);
}


    }

}

//protected void paintComponent(Graphics g) {
//super.paintComponent(g);      

 //         }

 class TimerListener implements ActionListener {
  @Override 
  public void actionPerformed(ActionEvent e) {


    repaint();

  }

    }