圖形矩形上的鼠標偵聽器java

Question

我想將鼠標偵聽器添加到矩形中，以便當用戶單擊一個矩形並將鼠標拖到下一個矩形時，會繪製一條線來跟蹤用戶移動，並且當前矩形用戶是在必須改變顏色。在Java中是新的，因此您的幫助將受到高度讚賞。

import java.awt.Color; 
import java.awt.Font; 
import java.awt.Rectangle; 
import java.awt.Graphics; 
import java.awt.event.MouseEvent; 
import java.awt.event.MouseListener; 

import javax.swing.BorderFactory; 
import javax.swing.JPanel; 

public class SundayPanel extends JPanel implements MouseListener{ 

private Rectangle rec; 
private JPanel p = new JPanel(); 
private Graphics graphic; 
public SundayPanel() 
{ 
    setSize(1000, 150); 
    setBackground(Color.white); 
    setBorder(BorderFactory.createEtchedBorder(Color.orange, Color.red)); 

    rec = new Rectangle(0, 0, 130, 100); 
} 

public void paint(Graphics g) 
{ 
    Font font = new Font("Times New Roman", Font.PLAIN, 72); 

    g.setFont(font); 
    g.setColor(Color.black); 
    //g.draw(rec); 
    g.draw3DRect(0, 0, 130, 100, true); 
    g.drawString("1", 50, 65); 
    g.draw3DRect(130, 0, 130, 100, true); 
    g.drawString("2", 180, 65); 
    g.draw3DRect(260, 0, 130, 100, true); 
    g.drawString("3", 300, 65); 
    g.draw3DRect(390, 0, 130, 100, true); 
    g.drawString("4", 430, 65); 
    g.draw3DRect(520, 0, 130, 100, true); 
    g.drawString("5", 550, 65); 
    g.draw3DRect(650, 0, 130, 100, true); 
    g.drawString("6", 700, 65); 
    g.draw3DRect(780, 0, 130, 100, true); 
    g.drawString("7", 820, 65); 
    g.draw3DRect(910, 0, 130, 100, true); 
    g.drawString("8", 950, 65); 
    g.draw3DRect(1040, 0, 130, 100, true); 
    g.drawString("9", 1080, 65); 
    g.draw3DRect(1170, 0, 130, 100, true); 
    g.drawString("10", 1200, 65); 
} 
} 

import javax.swing.JFrame; 

public class SundayMain extends JFrame{ 

/** 
    * @param args 
    */ 
public static void main(String[] args) { 
    JFrame sunFrame = new SundayFrame("Sunday Today"); 
    sunFrame.setVisible(true); 
    sunFrame.setSize(1330, 150); 
    sunFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 

} 

} 


import java.awt.BorderLayout; 

import javax.swing.JFrame; 

public class SundayFrame extends JFrame{ 

private SundayPanel sunPanel; 

public SundayFrame(String title) 
{ 
    super(title); 
    sunPanel = new SundayPanel(); 
    add(sunPanel, BorderLayout.CENTER); 

} 

} 

Answer 1

我修改了你的例子來畫線（按下按鈕，移動鼠標，釋放按鈕）。 代碼是可編譯的，可以在一個SundayPanel.java文件中執行。 可能它會幫助你實現你的確切目標：

注意：小心 - 代碼是非常醜陋的。 [添加鼠標監聽Java中的矩形]的

public class SundayPanel extends JPanel implements MouseMotionListener, MouseListener { 

    public SundayPanel() { 
     setSize(1000, 150); 
     setBackground(Color.white); 
     setBorder(BorderFactory.createEtchedBorder(Color.orange, Color.red)); 
    } 

    String[] values = new String[]{"1", "2", "3", "4", "5", "6", "7", "8", "9", "10"}; 

    public void paint(Graphics g) { 
     Font font = new Font("Times New Roman", Font.PLAIN, 72); 
     g.setFont(font); 
     for (int i = 0; i < 10; i++) { 
      int step = 130 * i; 
      if ((start != null) && ((int) (end.getX()/130) == i)) { 
       g.setColor(Color.orange); 
      } else { 
       g.setColor(Color.gray); 
      } 
      g.fill3DRect(step, 0, 130, 100, true); 
      g.setColor(Color.black); 
      g.drawString(values[i], 50 + step, 65); 
     } 
     if ((start != null) && (end != null)) { 
      g.drawLine((int) start.getX(), (int) start.getY(), (int) end.getX(), (int) end.getY()); 
     } 
    } 

    Point start; 

    Point end; 

    @Override 
    public void mouseClicked(MouseEvent e) { 
    } 

    @Override 
    public void mousePressed(MouseEvent e) { 
     start = e.getPoint(); 
    } 

    @Override 
    public void mouseDragged(MouseEvent e) { 
     end = e.getPoint(); 
     e.getComponent().repaint(); 
    } 

    @Override 
    public void mouseReleased(MouseEvent e) { 
     int from = (int) (start.getX()/130); 
     int to = (int) (end.getX()/130); 
     String tmp = values[from]; 
     values[from] = values[to]; 
     values[to] = tmp; 
     start = end = null; 
     e.getComponent().repaint(); 
    } 

    @Override 
    public void mouseEntered(MouseEvent e) { 
    } 

    @Override 
    public void mouseExited(MouseEvent e) { 
    } 

    @Override 
    public void mouseMoved(MouseEvent e) { 
    } 
} 

class SundayMain extends JFrame { 

    /** 
    * @param args 
    */ 
    public static void main(String[] args) { 
     JFrame sunFrame = new SundayFrame("Sunday Today"); 
     sunFrame.setVisible(true); 
     sunFrame.setSize(1330, 150); 
     sunFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 

    } 

} 

class SundayFrame extends JFrame { 

    private SundayPanel sunPanel; 

    public SundayFrame(String title) { 
     super(title); 
     sunPanel = new SundayPanel(); 
     sunPanel.addMouseListener(sunPanel); 
     sunPanel.addMouseMotionListener(sunPanel); 
     add(sunPanel, BorderLayout.CENTER); 

    } 

}