我已经编写了Java代码在图像上绘制多边形。当我将光标放在多边形内时，它会显示“ Inside”（内），否则显示“ Outside”（外）。因此，检测多边形内部的点工作正常。

但是我想实现setToolTipText多边形内部的效果，即在鼠标悬停在多边形内部时，它将显示浮动文本“ Inside”。

类似于此图像中的效果：

http://www.java2s.com/Code/Java/Swing-JFC/WorkingwithTooltipText.htm

为了达到预期的效果，以下代码中需要进行哪些最小的更改？

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.border.*;
import java.awt.image.*;
import java.awt.Graphics.*;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Point;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionAdapter;

class page1 extends JFrame implements MouseListener,MouseMotionListener ,ActionListener
{
    JFrame f;
    JLabel l;
    JPanel p1;
    ImageIcon ii;
    Image img;
    int height;
    int width;
    Container c;
    int pixels[];
    PixelGrabber pg;
    JPanel panel;
    Graphics2D gg;
    Polygon pp1=new Polygon();
    boolean startHovercurrent,startHoverprev=false;


    page1()
    {
        f=new JFrame("Sample Page");
        ii=new ImageIcon("sample.jpg");
        img=ii.getImage();
        height=ii.getIconHeight();
        width=ii.getIconWidth();
        pixels=new int[ii.getIconWidth()*ii.getIconHeight()];
        pg=new PixelGrabber(img,0,0,ii.getIconWidth(),ii.getIconHeight(),pixels,0,ii.getIconWidth());
        try
        {
            pg.grabPixels();
        }
        catch(InterruptedException k)
        {
        }

        //add points of polygon
        pp1.addPoint(300,300);
        pp1.addPoint(380,300);
        pp1.addPoint(380,220);
        pp1.addPoint(300,220);


        l=new JLabel(ii,JLabel.CENTER);
        c=f.getContentPane();
        JDesktopPane desk = new JDesktopPane();
        JInternalFrame p = new JInternalFrame("Image Frame",false, false, true, false);
        JScrollPane scroll = new JScrollPane(l);
        p.setContentPane(scroll);
        p.setBounds(0, 0, 740, 600);
        desk.add(p);
        p.setVisible(true);
        l.addMouseListener(this);
        l.addMouseMotionListener(this);

        c.add(desk, BorderLayout.CENTER);
        f.setSize(1024,738);
        f.setVisible(true);

    }


    public static void main(String args[])
    {
        new page1();    
    }
    public void mouseClicked(MouseEvent me)
    {
    }
    public void mouseEntered(MouseEvent me)
    {
    }
    public void mouseExited(MouseEvent me)
    {
    }
    public void mousePressed(MouseEvent me)
    {     
    }
    public void mouseReleased(MouseEvent me)
    {   
    }
    public void mouseMoved(MouseEvent me)
    {
        boolean contain1;
        int mx,my;
        gg=(Graphics2D)l.getGraphics();         
        gg.setColor(new Color(255,0,0) );
        gg.fillPolygon(pp1);

        mx = me.getX();
        my = me.getY();

        //check if mouse cursor is inside polygon or not
        // do not print anything if next cursor position is in same state
        contain1=pp1.contains(mx,my);
        if (contain1) {
            startHovercurrent = true;
            if(startHovercurrent!=startHoverprev)
                System.out.println("Inside");

            startHoverprev=startHovercurrent;
         } 
         else {
            startHovercurrent = false;
            if(startHovercurrent!=startHoverprev)
                System.out.println("Outside");

            startHoverprev=startHovercurrent;
         }
    }
    public void mouseDragged(MouseEvent me)
    {   
    }
    public void actionPerformed(ActionEvent ae)
    {  
    }   
}