我在 JPanel 上呈现了一个 3x3 类似检查板的图像，该图像被添加到 JFrame 上。然后我还有 9 个 JPanel（每个正方形顶部有 1 个），点击时需要在相应的正方形上绘制一些东西。我的问题是它只适用于左上角的正方形。其余的图纸似乎是在棋盘图像下方绘制的。因此，如果我注释掉加载棋盘图像的部分，然后像它们在那里一样单击，那么图纸就会正确显示。我使用分层窗格得到相同的结果。使用绝对定位并且坐标似乎是正确的，因为如果我删除棋盘图像，那么图纸会出现在它们应该出现的位置，并且图纸不会超过一个正方形。我的代码结构如下：
'main' 类创建框架并添加另一个类的实例，该类扩展 JPanel 并使用paintComponent(Graphics g) 绘制棋盘图像。'main' 类还添加了 9 个实例，该类扩展 JPanel 并使用paintComponent（Graphics g）在鼠标单击时绘制一些东西。每个实例都放置在一个正方形的顶部
请注意，因为我打算只使用 Rectangles 我将第二类命名为 Rectangles 但它是矩形 JPanels 而不是 java Rectangle 实例
代码：
public class Main3
{
private JFrame frame=new JFrame("");
private Rectangles rect00=new Rectangles(0,0,129,129);
private Rectangles rect01=new Rectangles(136,0,129,129);
private Rectangles rect02=new Rectangles(268,0,129,129);
private Rectangles rect10=new Rectangles(0,136,129,129);
private Rectangles rect11=new Rectangles(134,136,129,129);
private Rectangles rect12=new Rectangles(269,137,129,129);
private Rectangles rect20=new Rectangles(0,270,129,129);
private Rectangles rect21=new Rectangles(136,269,129,129);
private Rectangles rect22=new Rectangles(269,270,129,129);
public void Display()
{
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
frame.setLayout(null);
frame.setSize(600,400);
sub inter=new sub();
inter.setLayout(null);
inter.setBounds(0,0,600,400);
inter.setSize(600,400);
rect00.setBounds(rect00.getX(),rect00.getY(),rect00.getWidth(),rect00.getHeight());
rect01.setBounds(rect01.getX(),rect01.getY(),rect01.getWidth(),rect01.getHeight());
rect02.setBounds(rect02.getX(),rect02.getY(),rect02.getWidth(),rect02.getHeight());
rect10.setBounds(rect10.getX(),rect10.getY(),rect10.getWidth(),rect10.getHeight());
rect11.setBounds(rect11.getX(),rect11.getY(),rect11.getWidth(),rect11.getHeight());
rect12.setBounds(rect12.getX(),rect12.getY(),rect12.getWidth(),rect12.getHeight());
rect20.setBounds(rect20.getX(),rect20.getY(),rect20.getWidth(),rect20.getHeight());
rect21.setBounds(rect21.getX(),rect21.getY(),rect21.getWidth(),rect21.getHeight());
rect22.setBounds(rect22.getX(),rect22.getY(),rect22.getWidth(),rect22.getHeight());
rect00.setOpaque(false);
rect01.setOpaque(false);
rect02.setOpaque(false);
rect10.setOpaque(false);
rect11.setOpaque(false);
rect12.setOpaque(false);
rect20.setOpaque(false);
rect21.setOpaque(false);
rect22.setOpaque(false);
inter.add(rect00);
inter.add(rect01);
inter.add(rect02);
inter.add(rect10);
inter.add(rect11);
inter.add(rect12);
inter.add(rect20);
inter.add(rect21);
inter.add(rect22);
frame.add(inter);
frame.setResizable(false);
frame.setVisible(true);
}
public static void main(String args[])
{
new main().Display();
}
private class sub extends JPanel
{
private BufferedImage image;
public sub ()
{
try
{
image=ImageIO.read(new File("image.jpg"));
}
catch (IOException e)
{
e.printStackTrace();
}
}
@Override
public Dimension getPreferredSize()
{
return (new Dimension(600,400));
}
@Override
protected void paintComponent(Graphics g)
{
super.paintComponent(g);
g.drawImage(image, 0, 0, null);
}
}
}
这是另一个类
public class Rectangles extends JPanel implements MouseListener
{
private int Posx;
private int Posy;
private int width;
private int height;
private boolean selected=false;
public Rectangles(int Posx,int Posy,int width,int height)
{
this.Posx=Posx;
this.Posy=Posy;
this.width=width;
this.height=height;
this.addMouseListener(this);
}
@Override
protected void paintComponent(Graphics g)
{
if(selected==true)
{
Graphics2D g2 = (Graphics2D) g;
super.paintComponent(g2);
g2.setColor(new Color(250, 235, 215));
g2.drawRect(Posx,Posy,width,height);
Graphics2D g3=(Graphics2D)g;
g2.setColor(new Color(0,0,0));
g3.setStroke(new BasicStroke(20));
g3.drawLine(Posx,Posy,Posx+width,Posy+height);
g3.drawLine(Posx+width,Posy,Posx,Posy+height);
}
}
public int getX()
{
return Posx;
}
public int getY()
{
return Posy;
}
public int getWidth()
{
return width;
}
public int getHeight()
{
return height;
}
public void setSelected()
{
selected=true;
}
@Override
public void mouseClicked(MouseEvent arg0)
{
}
@Override
public void mouseEntered(MouseEvent arg0)
{
}
public void mouseExited(MouseEvent arg0)
{
}
@Override
public void mousePressed(MouseEvent arg0)
{
}
@Override
public void mouseReleased(MouseEvent arg0)
{
selected=true;
repaint();
}
}