I은 ​​버튼을 누를 때 및 가변 값이 변경된 후에 <code>repaint()</code> 메소드가 호출

Question

int club_num = 0; 
private int angle = 90;  
private int startX = 72; 
private int startY = 329; 
private double endX = startX + clublength * Math.sin(Math.toRadians(angle)); 
private double endY = startY + clublength * Math.cos(Math.toRadians(angle)); 

@Override 
public void paintComponent(Graphics g){ 
    super.paintComponent(g); 
    g.setColor(Color.BLACK); 
    g.drawLine(startX, startY, (int)endX, (int)endY); //this is what i want to change 
} 
public class Keys extends KeyAdapter { 
    @Override 
    public void keyPressed(KeyEvent e){ 
     if (e.getKeyCode() == KeyEvent.VK_LEFT){ 
      club_num--; //ultimately changes endX and endY 
      if (club_num < 0) 
       club_num = club[0].length-1; //ultimately changes endX and endY 
      repaint(); 
     } 
     else if (e.getKeyCode() == KeyEvent.VK_RIGHT){ 
      club_num++; //ultimately changes endX and endY 
      if (club_num > club[0].length-1) 
       club_num = 0; //ultimately changes endX and endY 
      repaint(); 
     } 
    } 
} 

, I 업데이트 된 변수 패러미터에 따라 변화하는 선 [g.drawLine(startX, startY, (int)endX, (int)endY)] 원하는의 paintComponent에서 변경된 변수를 칠하는 방법을 알아낼 수 없다 [endX and endY].

Answer 1

발견 답변!

이 스크립트를 내 스크립트에 추가하고 변수를 private double endX/endY으로 변경하고 타이머 개체를 추가했습니다.

public class TimerListener implements ActionListener { 
     public void actionPerformed(ActionEvent e) { 
      calcEndX(clublength, angle); 
      calcEndY(clublength, angle); 
     } 
    } 

    public void calcEndX(int clublength, int angle){ 
     endX = startX + clublength * Math.sin(Math.toRadians(angle)); 
    } 
    public void calcEndY(int clublength, int angle){ 
     endY = startY + clublength * Math.cos(Math.toRadians(angle)); 
    } 
    public double getEndX(){ 
     return endX; 
    } 
    public double getEndY(){ 
     return endY; 
    }