Radio panel and selection dependent panel draw

Question

Hi
I've got two problems with my applet which have me stumped. http://zeldia.cap.ed.ac.uk/Lumbribase/array_exp.php?cluster=LRP00075_8
1) I'd like the radio buttons on the top panel closer together. I've tried setting the panel grid layout to (1,5) (in the hope of 3 blanks on the right) and I've tried setting the prefered size but it seems to ignor the horizontal parameter unless I set it bigger that the available space.
2) The checkbox panel on the right is only relevant when the 'exposure' radio button is selected. How can I make it only add this panel when 'exposure' selected and thus checkBoxSetting[4]= true;
Thanks in advance for any info you can give.
Ann
import java.applet.Applet;
import java.awt.Graphics;
import java.awt.Color;
import java.awt.*;
import java.awt.event.*;
import java.lang.Math;
import java.net.*;
import java.io.*;
import java.util.*;
import javax.swing.*;
import java.text.*;
/*import java.sql.*;
import java.sql.DriverManager;
import java.sql.Connection;
import java.sql.SQLException;
public class ArrayExpApplet extends Applet
                       implements ItemListener, ActionListener  {
     private JCheckBox ATButton;
     private JCheckBox CdButton;
     private JCheckBox CuButton;
     private JCheckBox PAHButton;
     private JCheckBox ExposureButton;
     private JCheckBox ControlButton;
   static String ExposureString = "Exp";
   static String ControlString = "Con";
     private boolean[] checkBoxSetting = {true,true,true,true,false,true};
     private double[][] expLevels = new double[4][5];
     private double[]   controlLevels = new double[3];
     private Color[] EColor = new Color[5];
     private int originX=100;
     private int height=200;
     private int originY=height+(originX/2);
     private double controlScale=-1;
     private double expScale=-1;
     private double controlMax=0;
     private double expMax=0;
     private JPanel side =  CheckBoxPanelSide();
     private Panel canvasPanel = new Panel();
     public void init() {
      System.out.println("initiating...");
      setBackground(new Color(224, 238, 238));;
          //get the php expression string and read into 2D numeric array
          String expression_str = this.getParameter("expression_string");
          System.out.println("expression_string "+expression_str);
          String[] rows = expression_str.split (";");
          for (int k = 0; k < rows.length; k++) {
               System.out.println("row "+k+" = "+rows[k]);
               String[] cols = rows[k].split (",");
               for (int l = 0; l < cols.length; l++) {
                    System.out.println("col "+l+" = "+cols[l]);
                    expLevels[k][l]= Double.parseDouble(cols[l]);
          //get the php control string and read into a numeric array
          String control_str = this.getParameter("control_string");
          System.out.println("control_string "+control_str);
          rows = control_str.split (",");
          for (int k = 0; k < rows.length; k++) {
               System.out.println("row "+k+" = "+rows[k]);
               controlLevels[k]= Double.parseDouble(rows[k]);
          //find max expression to scale y axis
          for (int i=0; i<4; i++) {
               for (int j=0; j<5; j++){
                    if (expLevels[i][j]>expMax) {expMax=expLevels[i][j];}
          expScale=height/(double)expMax;
          //find max control to scale y axis
          for (int i=0; i<3; i++) {
               if (controlLevels>controlMax) {controlMax=controlLevels[i];}
          controlScale=height/(double)controlMax;
          //set up an array of 5 colours
          EColor[0]= new Color(200,0,255); //magenta
          EColor[1]= new Color(0,0,255);      //green
          EColor[2]= new Color(0,255,0);      //blue
          EColor[3]= new Color(254,190,0); //yellow
          EColor[4]= new Color(224, 238, 238); //background
public void start() {
System.out.println("starting...");
//          Panel canvasPanel = new Panel();
          Panel entirePanel = new Panel();
          Canvas graph = new Canvas();
          JPanel top = CheckBoxPanelTop();
          JPanel side = CheckBoxPanelSide();
          setLayout(new BorderLayout());
          //layout total area as boxes top to bottom
          entirePanel.setLayout(new BoxLayout(entirePanel, BoxLayout.PAGE_AXIS));
          //put top checkboxes in top box
          entirePanel.add(top);
          //layout area as boxes left to right
          canvasPanel.setLayout(new BoxLayout(canvasPanel, BoxLayout.LINE_AXIS));
          //put canvasPanel in bottom box
          entirePanel.add(canvasPanel);
               //Put a graph in the first box.
               canvasPanel.add(graph);
               //Put checkboxes in the right box.
               canvasPanel.add(side);
          add("North", entirePanel);
          add("East", canvasPanel);
     public JPanel CheckBoxPanelSide() {
          //Create the check boxes.
          ATButton = new JCheckBox("Atrazine");
          ATButton.setForeground(EColor[0]);
          ATButton.setBackground(new Color(224, 238, 238));
          ATButton.setSelected(true);
          checkBoxSetting[0]=true;
          CdButton = new JCheckBox("Cadmium");
          CdButton.setForeground(EColor[1]);
          CdButton.setBackground(new Color(224, 238, 238));
          CdButton.setSelected(true);
          checkBoxSetting[1]=true;
          CuButton = new JCheckBox("Copper");
          CuButton.setForeground(EColor[2]);
          CuButton.setBackground(new Color(224, 238, 238));
          CuButton.setSelected(true);
          checkBoxSetting[2]=true;
          PAHButton = new JCheckBox("PAH");
          PAHButton.setForeground(EColor[3]);
          PAHButton.setBackground(new Color(224, 238, 238));
          PAHButton.setSelected(true);
          checkBoxSetting[3]=true;
          //Register a listener for the check boxes.
          ATButton.addItemListener(this);
          CdButton.addItemListener(this);
          CuButton.addItemListener(this);
          PAHButton.addItemListener(this);
          JPanel s = new JPanel();
          s.setLayout(new GridLayout(6,1));
          s.setBackground(new Color(224, 238, 238));
          s.setBorder(BorderFactory.createLineBorder (Color.blue, 2));
          s.add(ATButton);
          s.add(CdButton);
          s.add(CuButton);
          s.add(PAHButton);
          return (s);
     public JPanel CheckBoxPanelTop() {
          //Create the radio buttons.
          JRadioButton ExposureButton = new JRadioButton("Exposure");
          ExposureButton.setBackground(new Color(224, 238, 238));
          ExposureButton.setSelected(true);
ExposureButton.setActionCommand(ExposureString);
          checkBoxSetting[4]=true;
          JRadioButton ControlButton = new JRadioButton("Control");
          ControlButton.setBackground(new Color(224, 238, 238));
ControlButton.setActionCommand(ControlString);
          ControlButton.setSelected(false);
          //Group the radio buttons.
          ButtonGroup group = new ButtonGroup();
          group.add(ControlButton);
          group.add(ExposureButton);
//Register a listener for the radio buttons.
          ControlButton.addActionListener(this);
          ExposureButton.addActionListener(this);
          JPanel t = new JPanel();
          t.setLayout(new GridLayout(1,5));
          t.setBackground(new Color(224, 238, 238));
          t.setBorder(BorderFactory.createLineBorder (Color.blue, 2));
          t.setPreferredSize(new Dimension(50, 35));
          t.add(ControlButton);
          t.add(ExposureButton);
          return (t);
// Listens to the radio buttons.
     public void actionPerformed(ActionEvent e) {
          System.out.println(""+e.getActionCommand());
          if (e.getActionCommand() == "Exp") {checkBoxSetting[4]= true;}
          if (e.getActionCommand() == "Con") {checkBoxSetting[4]= false;}
          repaint();
// add a checkbox listener
     public void itemStateChanged(ItemEvent event) {
          char c = '-';
          Object source = event.getItemSelectable();
          if (source == ATButton) {
               if (checkBoxSetting[0]== false) {checkBoxSetting[0]= true;}
               else {checkBoxSetting[0]= false;}
               c = 'a';
               System.out.println("CheckBox "+c);
          else if (source == CdButton) {
               if (checkBoxSetting[1]== false) {checkBoxSetting[1]= true;}
               else {checkBoxSetting[1]= false;}
               c = 'd';
               System.out.println("CheckBox "+c);
          else if (source == CuButton) {
               if (checkBoxSetting[2]== false) {checkBoxSetting[2]= true;}
               else {checkBoxSetting[2]= false;}
               c = 'u';
               System.out.println("CheckBox "+c);
          else if (source == PAHButton) {
               if (checkBoxSetting[3]== false) {checkBoxSetting[3]= true;}
               else {checkBoxSetting[3]= false;}
               c = 'p';
               System.out.println("CheckBox "+c);
          repaint();
     public void paint(Graphics g) {
          System.out.println("Paint");
          if (checkBoxSetting[4]== true) {   //paint exposures
               System.out.println("painting exposure");
               //Draw the data
               int step=100; //distance between exposures on x axis
               int x=originX; int y;
               for (int i=0; i<4; i++) {
                    System.out.println("CheckBox "+i+" is "+checkBoxSetting[i]);
                    if (checkBoxSetting[i]) {
                         g.setColor(EColor[i]);
                         for (int j=0; j<4; j++){
                              y=j+1;
                              g.drawLine(x,originY-(int)(expLevels[i][j]*expScale), x+step, originY-(int)(expLevels[i][y]*expScale));
                              x=x+step;
                         x=originX;
               //draw axis
               g.setColor(Color.black);
               g.drawLine(originX, (originX/2), originX, originY);
               g.drawLine(originX, originY, originX+(step*4), originY);
               //tickmark axis
               g.drawLine(originX, originY, originX, originY+5);
               g.drawLine(originX+step, originY, originX+step, originY+5);
               g.drawLine(originX+(step*2), originY, originX+(step*2), originY+5);
               g.drawLine(originX+(step*3), originY, originX+(step*3), originY+5);
               g.drawLine(originX+(step*4), originY, originX+(step*4), originY+5);
               g.drawLine(originX, originY, originX-5, originY);
               g.drawLine(originX, originY- (int) (expMax*expScale*0.25), originX-5, originY- (int) (expMax*expScale*0.25));//400*.5=200*.25=50
               g.drawLine(originX, originY- (int) (expMax*expScale*0.5), originX-5, originY- (int) (expMax*expScale*0.5));
               g.drawLine(originX, originY- (int) (expMax*expScale*0.75), originX-5, originY- (int) (expMax*expScale*0.75));
               g.drawLine(originX, originY- (int) (expMax*expScale), originX-5, originY- (int) (expMax*expScale));
               //lable x axis
               g.drawString("LC0", originX-9, originY+20);
               g.drawString("LC12.5", originX-18+step, originY+20);
               g.drawString("LC25", originX-12+(step*2), originY+20);
               g.drawString("LC37.5", originX-18+(step*3), originY+20);
               g.drawString("LC50", originX-12+(step*4), originY+20);
               g.drawString("Exposure", originX-24+(step*2), originY+40);
               //lable y axis
               String fmt = "0.00#";
               DecimalFormat df = new DecimalFormat(fmt);
               int xs=originX; int ys=originY; int zs=(int)((expMax/height)*0.25);
//               g.drawString("x"+xs+" y"+ys+" zs"+zs+" expMax"+expMax+" expScale"+expScale, 0, originY+60);
               g.drawString("0", originX-20, originY+4);
               g.drawString(""+df.format((double)(expMax*0.25)), originX-45, originY+4- (int) (expMax*expScale*0.25));//400*.5=200*.25=50
               g.drawString(""+df.format((double)(expMax*0.50)), originX-45, originY+4- (int) (expMax*expScale*0.5));
               g.drawString(""+df.format((double)(expMax*0.75)), originX-45, originY+4- (int) (expMax*expScale*0.75));
               g.drawString(""+df.format(expMax), originX-45, originY+4- (int) (expMax*expScale));
               g.drawString("E", originX-100, originY-(int)(height*0.5)-50);
               g.drawString("x", originX-100, originY-(int)(height*0.5)-40);
               g.drawString("p", originX-100, originY-(int)(height*0.5)-30);
               g.drawString("r", originX-100, originY-(int)(height*0.5)-20);
               g.drawString("e", originX-100, originY-(int)(height*0.5)-10);
               g.drawString("s", originX-100, originY-(int)(height*0.5));
               g.drawString("s", originX-100, originY-(int)(height*0.5)+10);
               g.drawString("i", originX-98, originY-(int)(height*0.5)+20);
               g.drawString("o", originX-100, originY-(int)(height*0.5)+30);
               g.drawString("n", originX-100, originY-(int)(height*0.5)+40);
          else {                // paint control
               System.out.println("painting control");
               //Draw the data
               int step=200; //distance between controls on x axis
               int x=originX; int y;
               for (int i=0; i<2; i++) {
                    g.setColor(EColor[0]);
                    int j=i+1;
                    g.drawLine(x,originY-(int)(controlLevels[i]*controlScale), x+step, originY-(int)(controlLevels[j]*controlScale));
                    x=x+step;
               //draw axis
               g.setColor(Color.black);
               g.drawLine(originX, (originX/2), originX, originY);
               g.drawLine(originX, originY, originX+(step*2), originY);
               //tickmark axis
               g.drawLine(originX, originY, originX, originY+5);
               g.drawLine(originX+step, originY, originX+step, originY+5);
               g.drawLine(originX+(step*2), originY, originX+(step*2), originY+5);
               g.drawLine(originX, originY, originX-5, originY);
               g.drawLine(originX, originY- (int) (expMax*expScale*0.25), originX-5, originY- (int) (expMax*expScale*0.25));//400*.5=200*.25=50
               g.drawLine(originX, originY- (int) (expMax*expScale*0.5), originX-5, originY- (int) (expMax*expScale*0.5));
               g.drawLine(originX, originY- (int) (expMax*expScale*0.75), originX-5, originY- (int) (expMax*expScale*0.75));
               g.drawLine(originX, originY- (int) (expMax*expScale), originX-5, originY- (int) (expMax*expScale));
               //lable x axis
               g.drawString("Late Cocoon", originX-27, originY+20);
               g.drawString("Juvenile", originX-20+step, originY+20);
               g.drawString("Adult", originX-20+(step*2), originY+20);
               g.drawString("Growth stage", originX-36+step, originY+40);
               //lable y axis
               String fmt = "0.00#";
               DecimalFormat df = new DecimalFormat(fmt);
               int xs=originX; int ys=originY; int zs=(int)((controlMax/height)*0.25);
//               g.drawString("x"+xs+" y"+ys+" zs"+zs+" controlMax"+controlMax+" scale"+scale, 0, originY+60);
               g.drawString("0", originX-15, originY+4);
               g.drawString(""+df.format((double)(controlMax*0.25)), originX-35, originY+4- (int) (controlMax*controlScale*0.25));//400*.5=200*.25=50
               g.drawString(""+df.format((double)(controlMax*0.50)), originX-35, originY+4- (int) (controlMax*controlScale*0.5));
               g.drawString(""+df.format((double)(controlMax*0.75)), originX-35, originY+4- (int) (controlMax*controlScale*0.75));
               g.drawString(""+df.format(controlMax), originX-35, originY+4- (int) (controlMax*controlScale));
               g.drawString("E", originX-100, originY-(int)(height*0.5)-50);
               g.drawString("x", originX-100, originY-(int)(height*0.5)-40);
               g.drawString("p", originX-100, originY-(int)(height*0.5)-30);
               g.drawString("r", originX-100, originY-(int)(height*0.5)-20);
               g.drawString("e", originX-100, originY-(int)(height*0.5)-10);
               g.drawString("s", originX-100, originY-(int)(height*0.5));
               g.drawString("s", originX-100, originY-(int)(height*0.5)+10);
               g.drawString("i", originX-98, originY-(int)(height*0.5)+20);
               g.drawString("o", originX-100, originY-(int)(height*0.5)+30);
               g.drawString("n", originX-100, originY-(int)(height*0.5)+40);
     //If we don't specify this, the canvas might not show up at all
     //(depending on the layout manager).
     public Dimension getMinimumSize() {return new Dimension(550,300);}
     //If we don't specify this, the canvas might not show up at all
     //(depending on the layout manager).
     public Dimension getPreferredSize() {return getMinimumSize();}
     public void stop() {
          System.out.println("stopping...");
     public void destroy() {
          System.out.println("preparing to unload...");

Answer 1

Thanks.
I've tried moving the lines ...
//Put checkboxes in the right box.
canvasPanel.add(side);from the start method to the radio button listerner...
    // Listens to the radio buttons.
     public void actionPerformed(ActionEvent e) {
          System.out.println(""+e.getActionCommand());
          if (e.getActionCommand() == "Exp") {
               checkBoxSetting[4]= true;
               //Put checkboxes in the right box.
               canvasPanel.add(side);
          if (e.getActionCommand() == "Con") {checkBoxSetting[4]= false;}
          repaint();
    }and into the paint method...
     public void paint(Graphics g) {
          System.out.println("Paint");
          if (checkBoxSetting[4]== true) {   //paint exposures
               System.out.println("painting exposure");
               //Put checkboxes in the right box.
               canvasPanel.add(side);
               //Draw the dataand in both cases the code complies and the applet runs without error messages but the panel is never displayed???