why graph is not appearing?

[vishnu vardhan brundavanam]

hi...everyone....
I created an applet which contains a manubar .In that menubar only one manuitem " load file..."(menu item) is there. Which is used to browse the a file which contains a number of values to draw the graph. By that values i want to draw a line graph .
my aim is that when ever i browse a new file , it should take the values form that and draw the graph ...
here is the calling one...

import javax.swing.*;

public class DrawGraph extends JApplet {
	String sourcefile;
	JMenuBar menuBar = new JMenuBar();
	public void init() {
		try {

			JMenuBar myMenu = new JMenuBar();
			JMenu main = new JMenu("File");
			JMenuItem item = new JMenuItem("Load File...");
			main.add(item);
			myMenu.add(main);
			this.setJMenuBar(myMenu);
			item.addActionListener(new MenuImplimentation());
			
		} catch (Exception e) {
		}
	}

}

here is the MenuImplimentation Class...

import java.applet.Applet;
import java.awt.Canvas;
import java.awt.Graphics;
import java.awt.ScrollPane;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import javax.swing.JFileChooser;
import javax.swing.JFrame;

public class MenuImplimentation  extends Applet implements ActionListener{
File file;
Graphics g;
JFrame frame = new JFrame();
Canvas c;
ScrollPane s;
DrawGraph d = new DrawGraph();
String sourcefile; 
public void init(){
	s = new ScrollPane();
	s.setSize(500, 500);
	add(s);
	try {
		
	} catch (Exception e1) {

		e1.printStackTrace();
	}
	c.setSize(4050 + 30, 500);
	s.add(c);

}
	public void actionPerformed(ActionEvent e) {
		System.out.println("itemselected...");
		JFileChooser fc = new JFileChooser();

		int retval = fc.showOpenDialog(d);
		if (retval == JFileChooser.APPROVE_OPTION) {

			file = fc.getSelectedFile();
			System.out.println("the path of the file is :" + file.getPath());
			sourcefile = file.getPath();
			try {
				c =new ShowGraph(sourcefile);
			} catch (Exception e2) {
			
				e2.printStackTrace();
			}
			try {
				new ShowGraph(sourcefile);

				
			} catch (Exception e1) {
				
				e1.printStackTrace();
			}
			
			
			
	}

}
}

Why the graph is not appearing , even i called the repaint()....

here is the ShowGraph class ....

import java.awt.*;
import java.awt.font.*;
import java.awt.geom.*;
import java.io.BufferedReader;
import java.io.FileReader;
import javax.swing.JFrame;

public class ShowGraph extends Canvas {
	
	int data[];
	int counter = 0;	
	String srcfile;
	
	public ShowGraph(String srcfile) throws Exception {
		this.srcfile = srcfile;
		
		
		BufferedReader src1 = new BufferedReader(new FileReader(srcfile));
		String str;
		int i1 = 0;

		while ((str = src1.readLine()) != null) {
			counter++;
		}
		data = new int[counter];

		BufferedReader src11 = new BufferedReader(new FileReader(srcfile));
		try {

			while ((str = src11.readLine()) != null) {
				// System.out.println(str);

				int a = (int) Integer.parseInt(str.trim());
				data[i1] = a;
				i1++;
				System.out.println(a);
			}
			
		} catch (NumberFormatException n) {
			n.printStackTrace();
		}
		src11.close();
		repaint();
	}

	
	final int PAD = 20;

	public void paint(Graphics g) {

		System.out.println("paint");
		super.paint(g);

		Graphics2D g2 = (Graphics2D) g;
		g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
				RenderingHints.VALUE_ANTIALIAS_ON);

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

		g2.draw(new Line2D.Double(PAD, PAD, PAD, h - PAD));

		g2.draw(new Line2D.Double(PAD, h - PAD, w - PAD, h - PAD));

		Font font = g2.getFont();
		FontRenderContext frc = g2.getFontRenderContext();
		LineMetrics lm = font.getLineMetrics("0", frc);
		float sh = lm.getAscent() + lm.getDescent();

		String s = " data ";
		float sy = PAD + ((h - 2 * PAD) - s.length() * sh) / 2 + lm.getAscent();
		for (int i = 0; i < s.length(); i++) {
			String letter = String.valueOf(s.charAt(i));
			float sw = (float) font.getStringBounds(letter, frc).getWidth();
			float sx = (PAD - sw) / 2;

			g2.drawString(letter, sx, sy);
			sy += sh;
		}


		double xInc = (double) (w - 2 * PAD) / (data.length - 1);

		double scale = (double) (h - 2 * PAD) / getMax();
		double x1 = 0;
		g2.setPaint(Color.green.darker());
		for (int i = 0; i < data.length - 1; i++) {
			x1 = PAD + i * xInc;
			double y1 = h - PAD - scale * data[i];
			double x2 = PAD + (i + 1) * xInc;
			double y2 = h - PAD - scale * data[i + 1];
			g2.draw(new Line2D.Double(x1, y1, x2, y2));

			g2.drawString((i + 1) + "", (float) x1, h - (PAD - 15));

		}

		g2.setPaint(Color.red);
		for (int i = 0; i < data.length; i++) {
			double x = PAD + i * xInc;
			double y = h - PAD - scale * data[i];
			g2.fill(new Ellipse2D.Double(x - 2, y - 2, 4, 4));
		}

		
	}

	public int getMax() {
		int max = -Integer.MAX_VALUE;
		for (int i = 0; i < data.length; i++) {
			if (data[i] > max)
				max = data[i];
		}
		return max;
	}

}

please help me ....
thank you...

[Lester Burnham]

I don't see code that would add the ShowGraph component to the applet.

Update: You're probably getting an exception in the init method, because "c" is still null when you're calling its "setSize" method. And assigning a value to "c" later does not cause it to be added to the layout.

[pete stein]

Is this your code or is it borrowed from other sources as it appears to be an amalgam of things? Also, you appear to be not following recommendations given to you earlier, which is fine, but at least tell us why you choose to ignore the previous recommendations. And why the multiple threads in the forum rather than just sticking with one?