java - 我们如何在摆动的两个面板之间画一条线

Question

只想通过在面板上画一条线来连接面板。

我有两个面板，两个面板都包含一个 Jtable。我想将一个面板的 jtable 的每个单元格连接到另一个 jpanel 的另一个 Jtable。

在这里，我想画出我用粉红色圆圈突出显示的线条。

这是我用来创建 jtables 的代码片段

 DefaultTableModel fcdbDataModel = new DefaultTableModel(fcdbIdTxnArray,
    fcdbIdTxnColumnArray);
fcdbIdTxnJTable = new FieldMapperJTable(fcdbDataModel);

这里 FieldMapperJTable 是我自定义的 jtable 类。

Answer 1

您可以使用 JFrame/JDialog GlassPane 作为绘画字段轻松做到这一点。只需将您的自定义组件设置为框架的玻璃窗格并直接在其上绘制链接。

您也可以使用框架/对话框的分层窗格来执行相同操作。

这是一个关于如何在玻璃窗格组件上绘制此类“链接”的小型工作示例：

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.HashMap;
import java.util.Map;

/**
 * @see http://stackoverflow.com/a/12389479/909085
 */

public class ComponentLinkerTest extends JComponent
{
    private Map<JComponent, JComponent> linked;

    public ComponentLinkerTest ()
    {
        super ();
        linked = new HashMap<JComponent, JComponent> ();
    }

    public void link ( JComponent c1, JComponent c2 )
    {
        linked.put ( c1, c2 );
        repaint ();
    }

    protected void paintComponent ( Graphics g )
    {
        Graphics2D g2d = ( Graphics2D ) g;
        g2d.setRenderingHint ( RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON );

        g2d.setPaint ( Color.BLACK );
        for ( JComponent c1 : linked.keySet () )
        {
            Point p1 = getRectCenter ( getBoundsInWindow ( c1 ) );
            Point p2 = getRectCenter ( getBoundsInWindow ( linked.get ( c1 ) ) );
            g2d.drawLine ( p1.x, p1.y, p2.x, p2.y );
        }
    }

    private Point getRectCenter ( Rectangle rect )
    {
        return new Point ( rect.x + rect.width / 2, rect.y + rect.height / 2 );
    }

    private Rectangle getBoundsInWindow ( Component component )
    {
        return getRelativeBounds ( component, getRootPaneAncestor ( component ) );
    }

    private Rectangle getRelativeBounds ( Component component, Component relativeTo )
    {
        return new Rectangle ( getRelativeLocation ( component, relativeTo ),
                component.getSize () );
    }

    private Point getRelativeLocation ( Component component, Component relativeTo )
    {
        Point los = component.getLocationOnScreen ();
        Point rt = relativeTo.getLocationOnScreen ();
        return new Point ( los.x - rt.x, los.y - rt.y );
    }

    private JRootPane getRootPaneAncestor ( Component c )
    {
        for ( Container p = c.getParent (); p != null; p = p.getParent () )
        {
            if ( p instanceof JRootPane )
            {
                return ( JRootPane ) p;
            }
        }
        return null;
    }

    public boolean contains ( int x, int y )
    {
        return false;
    }

    private static ComponentLinkerTest linker;

    public static void main ( String[] args )
    {
        setupLookAndFeel ();

        JFrame frame = new JFrame ();

        linker = new ComponentLinkerTest ();
        frame.setGlassPane ( linker );
        linker.setVisible ( true );

        JPanel content = new JPanel ();
        content.setLayout ( new GridLayout ( 10, 5, 5, 5 ) );
        content.setBorder ( BorderFactory.createEmptyBorder ( 5, 5, 5, 5 ) );
        frame.add ( content );

        for ( int i = 0; i < 50; i++ )
        {
            final JButton button = new JButton ( "Button" + i );
            button.addActionListener ( new ActionListener ()
            {
                public void actionPerformed ( ActionEvent e )
                {
                    link ( button );
                }
            } );
            content.add ( button );
        }

        frame.setDefaultCloseOperation ( JFrame.EXIT_ON_CLOSE );
        frame.pack ();
        frame.setLocationRelativeTo ( null );
        frame.setVisible ( true );
    }

    private static JButton last = null;

    private static void link ( JButton button )
    {
        if ( last == null )
        {
            last = button;
        }
        else
        {
            linker.link ( last, button );
            last = null;
        }
    }

    private static void setupLookAndFeel ()
    {
        try
        {
            UIManager.setLookAndFeel ( UIManager.getSystemLookAndFeelClassName () );
        }
        catch ( ClassNotFoundException e )
        {
            e.printStackTrace ();
        }
        catch ( InstantiationException e )
        {
            e.printStackTrace ();
        }
        catch ( IllegalAccessException e )
        {
            e.printStackTrace ();
        }
        catch ( UnsupportedLookAndFeelException e )
        {
            e.printStackTrace ();
        }
    }
}

结果：（
只需依次单击任意两个按钮，它们就会链接起来）

PS要使线条更粗，您可以在绘画时更改笔触：

g2d.setStroke ( new BasicStroke ( 5f ) );