Class final project need help

Question

I have this final project due Monday for my java class. I'm having some trouble with this zoom slider which gives me 2 errors about "cannot find symbol". I've tried just about eveything i can think of and i cant come up with the solution... Here is my code:
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.event.*;
import javax.swing.*;
import java.util.*;
import java.awt.event.*;
import java.awt.*;
import java.io.*;
public class MenuExp extends JFrame implements MouseMotionListener,MouseListener,ActionListener
/* creates the file menus and submenus */
     JMenu fileMenu = new JMenu("File");
    JMenu plotMenu = new JMenu("Plotting");
    JMenu helpMenu = new JMenu("Help");
    JMenuItem loadAction = new JMenuItem("Load");
    JMenuItem saveAction = new JMenuItem("Save");
    JMenuItem quitAction = new JMenuItem("Quit");
    JMenuItem colorAction = new JMenuItem("Segment Colors");
    JMenuItem helpAction = new JMenuItem("Instructions");
    JButton button;
     Cursor previousCursor = new Cursor(Cursor.DEFAULT_CURSOR);
    JLabel cLabel;
    JPanel cPanel;
    private String filename = null;  // set by "Open" or "Save As"
    double scale = 1.0;
    public MenuExp(File f)
        setTitle("PlotVac");
        Container pane = getContentPane();
        ImageIcon chartImage = new ImageIcon(f.getName());
          ChartDisplay chartLabel = new ChartDisplay(chartImage);
          JScrollPane scpane = new JScrollPane(chartLabel);
          pane.add(scpane, BorderLayout.CENTER);
          chartLabel.addMouseListener(this);  //change cursor
          chartLabel.addMouseMotionListener(this); //handle mouse movement
          JPanel cPanel = new JPanel();
          cLabel= new JLabel("cursor outside chart");
          cPanel.add(cLabel);
          pane.add(cPanel, BorderLayout.NORTH);
          button = new JButton("Clear Route");
        button.setAlignmentX(Component.LEFT_ALIGNMENT);
        button.setFont(new Font("serif", Font.PLAIN, 14));
          cPanel.add(button);
          getContentPane().add(getSlider(), "Last");
/* Creates a menubar for a JFrame */
        JMenuBar menuBar = new JMenuBar();
/* Add the menubar to the frame */
        setJMenuBar(menuBar);
/* Define and add three drop down menu to the menubar */
        menuBar.add(fileMenu);
        menuBar.add(plotMenu);
        menuBar.add(helpMenu);
/* Create and add simple menu item to the drop down menu */
        fileMenu.add(loadAction);
        fileMenu.add(saveAction);
        fileMenu.addSeparator();
        fileMenu.add(quitAction);
        plotMenu.add(colorAction);
        helpMenu.add(helpAction);
         loadAction.addActionListener(this);
         saveAction.addActionListener(this);
         quitAction.addActionListener(this);
    private JSlider getSlider()
        JSlider slider = new JSlider(25, 200, 100);
        slider.setMinorTickSpacing(5);
        slider.setMajorTickSpacing(25);
        slider.setPaintTicks(true);
        slider.setPaintLabels(true);
        slider.addChangeListener(new ChangeListener()
            public void stateChanged(ChangeEvent e)
                 int value = ((JSlider)e.getSource()).getValue();
                 cPanel.zoom(value/100.0);
        return slider;
    private void zoom(double scale)
        this.scale = scale;
        cPanel.setToScale(scale, scale);
        repaint();
/* Handle menu events. */
       public void actionPerformed(ActionEvent e)
          if (e.getSource() == loadAction)
               loadFile();
         else if (e.getSource() == saveAction)
                saveFile(filename);
         else if (e.getSource() == quitAction)
               System.exit(0);
/** Prompt user to enter filename and load file.  Allow user to cancel. */
/* If file is not found, pop up an error and leave screen contents
/* and filename unchanged. */
       private void loadFile()
         JFileChooser fc = new JFileChooser();
         String name = null;
         if (fc.showOpenDialog(null) != JFileChooser.CANCEL_OPTION)
                name = fc.getSelectedFile().getAbsolutePath();
         else
                return;  // user cancelled
         try
                Scanner in = new Scanner(new File(name));  // might fail
                filename = name;
                while (in.hasNext())
                in.close();
         catch (FileNotFoundException e)
                JOptionPane.showMessageDialog(null, "File not found: " + name,
                 "Error", JOptionPane.ERROR_MESSAGE);
/* Save named file.  If name is null, prompt user and assign to filename.
/* Allow user to cancel, leaving filename null.  Tell user if save is
/* successful. */
       private void saveFile(String name)
         if (name == null)
                JFileChooser fc = new JFileChooser();
                if (fc.showSaveDialog(null) != JFileChooser.CANCEL_OPTION)
                  name = fc.getSelectedFile().getAbsolutePath();
         if (name != null)
              try
                  Formatter out = new Formatter(new File(name));  // might fail
                    filename = name;
                  out.close();
                  JOptionPane.showMessageDialog(null, "Saved to " + filename,
                    "Save File", JOptionPane.PLAIN_MESSAGE);
                catch (FileNotFoundException e)
                  JOptionPane.showMessageDialog(null, "Cannot write to file: " + name,
                   "Error", JOptionPane.ERROR_MESSAGE);
/* implement MouseMotionListener methods */     
     public void mouseDragged(MouseEvent arg0)
     public void mouseMoved(MouseEvent arg0)
          int x = arg0.getX();
          int y = arg0.getY();
          cLabel.setText("X pixel coordiate: " + x + "     Y pixel coordinate: " + y);
/*      implement MouseListener methods */
     public void mouseClicked(MouseEvent arg0)
     public void mouseEntered(MouseEvent arg0)
         previousCursor = getCursor();
         setCursor(new Cursor (Cursor.CROSSHAIR_CURSOR) );
     public void mouseExited(MouseEvent arg0)
         setCursor(previousCursor);
         cLabel.setText("cursor outside chart");
     public void mousePressed(MouseEvent arg0)
     public void mouseReleased(MouseEvent arg0)
/* main method to execute demo */          
    public static void main(String[] args)
         File chart = new File("teritory-map.gif");
        MenuExp me = new MenuExp(chart);
        me.setSize(1000,1000);
        me.setLocationRelativeTo(null);
        me.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        me.setVisible(true);
}and this is the other part:
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.geom.Line2D;
import javax.swing.Icon;
import javax.swing.JLabel;
public class ChartDisplay extends JLabel
/* line at 45 degrees from horizontal */
     private int x1=884, y1=290, x2=1084, y2=490;
/* horizontal line - x3 same as x2 */
     private int x3=1084, y3=490, x4=1384, y4=490;
     public ChartDisplay(Icon arg0)
          super(arg0);
/* This overrides inherited method to draw on image */
     protected void paintComponent(Graphics arg0)
          super.paintComponent(arg0);
/* Utility method to draw a "dot" at line ends */
     private void drawDot(Graphics g, Color c, int xDot, int yDot, int sizeDot)
          Color previousColor = g.getColor();
          g.setColor(c);
            g.fillOval(xDot-(sizeDot/2), yDot-(sizeDot/2), sizeDot, sizeDot);
            g.setColor(previousColor);   
/* Utility method to draw a wider line */
     private void drawLine(Graphics g, Color c, int lineWidth, int xStart, int yStart, int xEnd, int yEnd)
          Color previousColor = g.getColor(); // save previous color
          Graphics2D g2 = (Graphics2D) g;  // access 2D properties
            g2.setPaint(c);  // use color provided as parameter
         g2.setStroke(new BasicStroke(lineWidth)); // line width
         g.setColor(previousColor);    // restore previous color
}I've basically used the structure of other programs and incorporated them into my design. If anyone knows how i can fix the errors please let me know. The errors are found in line 91 and 100 which is where the zoom slider is occuring.
**NOTE** the program isnt fully functional in the sense that there are buttons and tabs etc.. that are missing action listeners and things like that.
Thanks for the help
Edited by: gonzale3 on Apr 17, 2008 6:55 PM

Answer 1

gonzale3 wrote:
The code was on the forums as the person who posted it was using it as an example in a program he used... i didnt borrow the entire code im just using the way he did the zoom method and added it into my program. I wasnt aware that it was used in the JPanel class. C'mon, it's your program. If you don't know what you are doing in this program, then you shouldn't be using it.
That is why im asking if someone can show me the right way to implement a zoom slider into my program or maybe give me an example where its used.What the fuck is a zoom slider???
Edited by: Encephalopathic on Apr 17, 2008 8:00 PM