添加到方塊動畫

Question

1. 我試圖創建一個運行類似於在this video一個動畫程序，但我無法增加更多的正方形。我試圖將所有的正方形添加到數組列表中，但我無法弄清楚它到了哪裏。

2. 到目前爲止，這是我的代碼：

   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

你得代碼繪製出一個矩形，在這裏：

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

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

現在我會建議，將您將這些值移植到Square對象中。或者，更好的是，使用Rectangle對象。如果您使用自定義的方式去：

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. 
    } 
} 

然後，所有你需要做的，是互相調用對象的方法paintComponent在一些名單。假設您有一些列表：

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


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

Answer 2

這是迄今爲止的代碼。我知道它很討厭，但因爲我一直在嘗試不同的東西，它們都不起作用。我非常感謝你的幫助。謝謝。 @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(); 

    } 

    }