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我正在创建Swing应用程序。这是一种与移动对象应用程序的路线图。我把我的形状组件分成两个JPanel
s。一个是静态组件JPanel
,第二个是动态组件JPanel
,并且都添加到mainPanel中。两个面板都是重叠的,而对于动态组件面板来说,不透明是错误的以使其透明。当我为动态组件面板重新绘制时,它也会触发重新绘制静态组件面板。如果动态组件面板的形状发生变化并且静态组件面板形状不应该被擦除,我不想每次重新绘制静态组件面板。在重叠面板上绘制图形,一个面板绘制固定和另一个绘制可移动
目前我的逻辑如下。这是伪代码。 请帮助我如何绘制静态组件的可移动组件顶部,并在启动时绘制静态组件。
public class layeredpanel extends JFrame
{
private JPanel contentPane;
public static void main(String[] args)
{
EventQueue.invokeLater(new Runnable()
{
public void run()
{
try
{
layeredpanel frame = new layeredpanel();
frame.setVisible(true);
} catch (Exception e)
{
e.printStackTrace();
}
}
});
}
/**
* Create the frame.
*/
public layeredpanel()
{
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, 450, 300);
contentPane = new JPanel();
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
contentPane.setLayout(new BorderLayout(0, 0));
setContentPane(contentPane);
JPanel panel = new JPanel();
contentPane.add(panel, BorderLayout.CENTER);
panel.setLayout(new OverlayLayout(panel));
final JPanel layer_1 = new layer1();
layer_1.setOpaque(false);
panel.add(layer_1);
JPanel layer_2 = new layer2();
panel.add(layer_2);
Thread thread = new Thread(new Runnable()
{
@Override
public void run()
{
while(true)
{try
{
Thread.sleep(500);
} catch (InterruptedException e)
{
e.printStackTrace();
}
layer_1.repaint();
}
}
});
thread.start();
}
class layer1 extends JPanel
{
@Override
public void paintComponent(Graphics g)
{
// TODO Auto-generated method stub
super.paintComponent(g);
System.out.println("Paint1");
g.setColor(Color.blue);
g.drawRect(30, 20, 40, 40);
}
}
class layer2 extends JPanel
{
@Override
public void paintComponent(Graphics g)
{
System.out.println("Paint2");
// TODO Auto-generated method stub
super.paintComponent(g);
g.setColor(Color.green);
g.fillRect(30, 20, 20, 20);}
}
}
输出:Paint2
Paint1
Paint2
Paint1
Paint2
Paint1
Paint2
Paint1
Paint2
Paint1
Paint2
Paint1
Paint2
Paint1