Label Setbounds以秒爲單位的延遲

Question

所以，我正在嘗試製作一個賽車程序。在這種情況下，當用戶釋放W鍵而不是完全停止時，我希望汽車減速直到速度爲0。

下面的代碼：

JLabel carImage = new JLabel(new ImageIcon("carimage.jpg")); 
int carAcceleration = 100; 
int carPositionX = 0, carPositionY = 100; 
// assume it is already add in the container 

public void keyReleased(KeyEvent key) { 
    handleKeyReleased(key); 
} 

int slowdown = 0; 
Timer timer = new Timer(1000,this); // 1000ms for test 
public void handleKeyReleased(KeyEvent key) { 
    if(key.getKeyCode() == KeyEvent.VK_W) { 
     slowdown=1; 
     timer.start(); 
    } 
} 

public void actionPerformed(ActionEvent action) { 
    if(slowdown == 1) { 
     while(carAcceleration> 0) { 
      carAcceleration--; 
      carPositionX += carAcceleration; 
      carImage.setBounds(carPositionX, carPositionY, 177,95); 
      timer.restart(); 
     } 
    } 
    timer.stop(); 
    slowdown = 0; 
} 

但是，當我鬆開W鍵。它等了一整秒，然後突然傳送100px到右邊並停下來。

我也試過使用Thread.sleep（1000）;但同樣的事情發生。

JLabel carImage = new JLabel(new ImageIcon("carimage.jpg")); 
int carAcceleration = 100; 
int carPositionX = 0, carPositionY = 100; 
// assume it is already add in the container 

public void keyReleased(KeyEvent key) { 
    handleKeyReleased(key); 
} 

public void handleKeyReleased(KeyEvent key) { 
    if(key.getKeyCode() == KeyEvent.VK_W) { 
     while(carAcceleration> 0) { 
      carAcceleration--; 
      carPositionX += carAcceleration; 
      carImage.setBounds(carPositionX, carPositionY, 177,95); 
      try { 
       Thread.sleep(1000); 
      } catch (InterruptedException ie) { 
       // 
      } 
     } 
    } 
} 

我希望它能像這樣執行。

carAcceleration | carPositionX | Output  
---------------------------------------------------------------------- 
100    | 100   | carImage.setBounds(100,100,177,95); 
       |    | PAUSES FOR SECONDS 
99    | 199   | carImage.setBounds(199,100,177,95); 
       |    | PAUSES FOR SECONDS 
98    | 297   | carImage.setBounds(297,100,177,95); 
       |    | PAUSES FOR SECONDS 
... and so on 

在此先感謝。 ：D

Answer 1

這個example使用阻尼彈簧模型來模仿這種減速。 A javax.swing.Timer用於調節動畫。

Answer 2

而不是做carPositionX+=carAcceleration嘗試carPositionY+=carAccleration。這應該使汽車在窗口座標系的y軸上移動。