Java:从不同的类绘制到 JPanel

Question

我有一个小问题 - 如何从其他类/文件/方法中重新绘制主类中的 JPanel？

故事是，我有一个 Swing 窗口，其中有一个方法列表，这些方法是通过浏览文件夹中的文件和类并读取方法及其描述(注释)自动生成的。现在，问题是，当出现一个类时，其中一个方法需要使用圆圈和线条来绘制太阳，那么我怎样才能让它显示在主窗口中？

我环顾四周(阅读:谷歌搜索)，发现 JPanel 应该很方便，但是从另一个类和方法在其上绘画，而不知道他们的名字是什么以及他们何时使用创建的绘画。 .困难。

我还添加了 main 方法，如果有任何用处的话..

static int indez = 0;
    protected static JList list; 
    static boolean valitud = false;
    public static JTextArea txtala;
    public static JScrollPane scrl;
    public static JPanel pilt;
    static Map<Integer, String[]> info = new TreeMap<Integer, String[]>();
    static ArrayList<Integer> nrs = new ArrayList<Integer>();
    public static void main(String[] args){
        Iterator<Entry<Integer, String[]>> iterator;
        Entry<Integer, String[]> entry;
        Integer val = 0;

        JFrame f = new JFrame("Praktikumid");
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.setSize(750, 350);

        JPanel panel = new JPanel();
        pilt = new JPanel(){public void paintComponent(Graphics g) {
            super.paintComponent(g);
            g.drawString("This is my custom Panel!", 10, 20);
        }};

        pilt.setVisible(false);
        pilt.setPreferredSize(new Dimension(f.getWidth() - 200, f.getHeight() - 20));
        pilt.setBackground(Color.GRAY);

        GroupLayout layout = new GroupLayout(panel);
        panel.setLayout(layout);
        layout.setAutoCreateGaps(true);
        layout.setAutoCreateContainerGaps(true);

        ActionListener kuular = new ActionListener() {
            public void actionPerformed(ActionEvent tegu) {
                valitud = true;
                try {
                    praxStarter();
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        };

        MouseListener hiir = new MouseListener() {  
            public void mouseClicked(MouseEvent e) {
                indez = list.getSelectedIndex();
            }
            @Override
            public void mouseEntered(MouseEvent e) {}
            @Override
            public void mouseExited(MouseEvent e) {}
            @Override
            public void mousePressed(MouseEvent e) {}
            @Override
            public void mouseReleased(MouseEvent e) {}  
        };  

        JLabel kiri = new JLabel("Vali hiirega ja vajuta nupule");

        ArrayList<String> selections = new ArrayList<String>();

        // Iterating over all the items in another method to get the modules

        list = new JList(selections.toArray());
        list.setSelectedIndex(0);
        list.addMouseListener(hiir);

        JScrollPane listScroller = new JScrollPane(list, JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED, JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);
        listScroller.setMinimumSize(new Dimension(200, 50));
        listScroller.setMaximumSize(new Dimension(200, f.getHeight() * 1000));

        JButton button = new JButton("Vali");
        button.setActionCommand(Integer.toString(list.getSelectedIndex()));
        button.addActionListener(kuular);

        Font font = new Font("Arial", Font.PLAIN, 12);
        txtala = new JTextArea("<-- Vali sealt");
        txtala.setEditable(false);
        txtala.setMargin(new Insets(5, 8, 0, 0));
        txtala.setFont(font);
        scrl = new JScrollPane(txtala, JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED, JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
        scrl.setPreferredSize(new Dimension(f.getWidth() - 200, f.getHeight() - 20));

        pilt.setBackground(Color.PINK);
        pilt.setVisible(false);
        pilt.setPreferredSize(new Dimension(f.getWidth() - 200, f.getHeight() - 20));

        GroupLayout.ParallelGroup menu = layout.createParallelGroup();
        GroupLayout.SequentialGroup row = layout.createSequentialGroup();
        GroupLayout.SequentialGroup leftright = layout.createSequentialGroup();
        GroupLayout.ParallelGroup topdown = layout.createParallelGroup();
        GroupLayout.ParallelGroup dbl = layout.createParallelGroup();
        GroupLayout.ParallelGroup dblrow = layout.createParallelGroup();

        menu.addComponent(kiri);
        menu.addComponent(listScroller);
        menu.addComponent(button);
        leftright.addGroup(menu);
        dbl.addComponent(scrl);
        dbl.addComponent(pilt);
        leftright.addGroup(dbl);

        row.addComponent(kiri);
        row.addComponent(listScroller);
        row.addComponent(button);
        topdown.addGroup(row);
        dblrow.addComponent(scrl);
        dblrow.addComponent(pilt);
        topdown.addGroup(dblrow);

        layout.setHorizontalGroup(leftright);
        layout.setVerticalGroup(topdown);

        panel.setComponentZOrder(pilt, 1);
        panel.setComponentZOrder(scrl, 0);

        f.add(panel);
        //f.pack();
        f.setVisible(true);
    }

    public static void praxStarter()  throws Exception{
            // As a note - nrs is the holder for menu indexes
            // info is a Map of those same menu items 
            // And one entry in info is in the form of String[]{name, class.method}
        String[] tekst = new String[2];
        String kls, met;
        Method meetod;

        txtala.setText("");

        tekst = info.get(nrs.get(indez));
        kls = tekst[1].substring(0, tekst[1].indexOf("."));
        met = tekst[1].substring(tekst[1].indexOf(".") + 1, tekst[1].length());

        meetod = Class.forName(kls).getMethod(met);
        meetod.setAccessible(true);
        meetod.invoke(Class.forName(kls).newInstance());
    }

此外，这里还有一个类绘图(或尝试绘图)的示例:

public class brush extends Applet {
public void paint(Graphics g) {
        int x0 = 150;
        int y0 = 150;
        int r = 100;
        int x, y;
        double t;

        int w = getWidth();
        int h = getHeight();

        x0 = w / 2;
        y0 = h / 2;

        g.setColor(Color.white);
        g.fillRect(0, 0, w, h);

        g.setColor(Color.black);

        for (t = -Math.PI; t < Math.PI; t = t + Math.PI / 16) {
            x = (int) (r * Math.cos(t) + x0);
            y = (int) (r * Math.sin(t) + y0);
            g.drawLine(x0, y0, x, y);
        }
    }
}

感谢您的回答和建议!

编辑:这是一个屏幕截图:

左侧是常规的屏幕打印文本模块。右侧是隐藏的文本部分，并显示 JPanel，其中 JPanel 是从 pilt = new JPanel() 部分绘制的，但在主类之外没有任何其他成功的编辑。

编辑:我尝试以多种方式绘制，尝试搜索出现的解决方案，例如

`txtala.setVisible(false);
scrl.setVisible(false);
pilt.setBorder(BorderFactory.createLineBorder(Color.BLACK));
pilt.setVisible(true);
//bi = new BufferedImage(pilt.getWidth() + 1000, pilt.getHeight() + 1000, BufferedImage.TYPE_INT_ARGB);
Graphics g = pilt.getGraphics();
g.setColor(Color.black);
g.drawLine(0, 0, 1000, 1000);
g.drawString("OLOLOLOLO!", 30, 50);
pilt.paint(g);
pilt.update(g);
//g.dispose();
//repaint();`

Answer 1

好吧，所以我走了简单的路。我没有在主窗口中使用相同的 Pane ，而是创建了一个新的弹出窗口并将框架放入其中。我知道，这不是最好的解决方案，但是干草，总比没有好。如果我设法找到一种没有弹出窗口的方法，那么我会将其发布在这里。在那之前，祝大家好运!