Why the oval is not showing up?

Question

heres my code:
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
public class myApplet extends java.applet.Applet {
boolean initialization = true;
int centerX, centerY, maxX, maxY;
float pixelSize, rWidth = 400.0F, rHeight = 400.0F;
BufferedImage gBuffer;
void initializeGraphics()
Dimension d = canvas1.getSize();
maxX = d.width - 1; maxY = d.height - 1;
pixelSize = Math.max((rWidth)/maxX, (rHeight)/maxY);
centerX = maxX/2; centerY = maxY/2;
int iX(float x){return Math.round(centerX + x/pixelSize);}
int iY(float y){return Math.round(centerY - y/pixelSize);}
float fx(int x){return ((x - centerX) * pixelSize);}
float fy(int y){return ((centerY - y) * pixelSize);}
void clearGraphics(Graphics g) {
g.setColor(Color.WHITE);
g.fillRect(0,0, maxX, maxY);
/** Initializes the applet Trans2D */
public void init() {
try {
java.awt.EventQueue.invokeAndWait(new Runnable() {
public void run() {
initComponents();
} catch (Exception ex) {
ex.printStackTrace();
this.setSize(700, 700);
gBuffer = new BufferedImage((int)rWidth, (int)rHeight, BufferedImage.TYPE_INT_ARGB);
/** This method is called from within the init() method to
* initialize the form.
* WARNING: Do NOT modify this code. The content of this method is
* always regenerated by the Form Editor.
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
canvas1 = new mycanvas();
jScrollBarPoints = new javax.swing.JScrollBar();
jLabelNoPoints = new javax.swing.JLabel();
canvas1.addMouseListener(new java.awt.event.MouseAdapter() {
public void mousePressed(java.awt.event.MouseEvent evt) {
canvas1MousePressed(evt);
jScrollBarPoints.setMaximum(25);
jScrollBarPoints.setMinimum(3);
jScrollBarPoints.setOrientation(javax.swing.JScrollBar.HORIZONTAL);
jScrollBarPoints.addAdjustmentListener(new java.awt.event.AdjustmentListener() {
public void adjustmentValueChanged(java.awt.event.AdjustmentEvent evt) {
jScrollBarPointsAdjustmentValueChanged(evt);
jLabelNoPoints.setText("3");
org.jdesktop.layout.GroupLayout layout = new org.jdesktop.layout.GroupLayout(this);
this.setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
.add(layout.createSequentialGroup()
.addContainerGap()
.add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.TRAILING)
.add(org.jdesktop.layout.GroupLayout.LEADING, jScrollBarPoints, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, 400, Short.MAX_VALUE)
.add(org.jdesktop.layout.GroupLayout.LEADING, canvas1, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, 400, Short.MAX_VALUE))
.add(18, 18, 18)
.add(jLabelNoPoints, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 30, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE)
.add(296, 296, 296))
layout.setVerticalGroup(
layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
.add(layout.createSequentialGroup()
.addContainerGap()
.add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
.add(jLabelNoPoints)
.add(layout.createSequentialGroup()
.add(jScrollBarPoints, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(org.jdesktop.layout.LayoutStyle.RELATED)
.add(canvas1, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 452, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE)))
.add(20, 20, 20))
}// </editor-fold>
private void canvas1MousePressed(java.awt.event.MouseEvent evt) {                                    
// TODO add your handling code here:
Graphics g = gBuffer.getGraphics();
g.drawOval(evt.getX(), evt.getY(), 10, 10);
g.fillOval(evt.getX(), evt.getY(), 10, 10);
private void jScrollBarPointsAdjustmentValueChanged(java.awt.event.AdjustmentEvent evt) {                                                       
jLabelNoPoints.setText(""+jScrollBarPoints.getValue());
// Variables declaration - do not modify
private java.awt.Canvas canvas1;
private javax.swing.JLabel jLabelNoPoints;
private javax.swing.JScrollBar jScrollBarPoints;
// End of variables declaration
public class mycanvas extends java.awt.Canvas {
public void paint(Graphics g){
super.paint(g);
my question is.when i press with the mouse on canvas1 why it doesnt draw an oval in that X,Y ? How can I solve that? Thanks!

Answer 1

import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
public class myApplet extends java.applet.Applet {
boolean initialization = true; 
int centerX, centerY, maxX, maxY;
float pixelSize, rWidth = 400.0F, rHeight = 400.0F;
BufferedImage gBuffer;
void initializeGraphics()
   Dimension d = canvas1.getSize();
   maxX = d.width - 1; maxY = d.height - 1;
   pixelSize = Math.max((rWidth)/maxX, (rHeight)/maxY);
   centerX = maxX/2; centerY = maxY/2;
  int iX(float x){return Math.round(centerX + x/pixelSize);}
  int iY(float y){return Math.round(centerY - y/pixelSize);}
  float fx(int x){return ((x - centerX) * pixelSize);}
  float fy(int y){return ((centerY - y) * pixelSize);}
void clearGraphics(Graphics g) {
    g.setColor(Color.WHITE);
    g.fillRect(0,0, maxX, maxY);
    /** Initializes the applet Trans2D */
    public void init() {
        try {
            java.awt.EventQueue.invokeAndWait(new Runnable() {
                public void run() {
                    initComponents();
        } catch (Exception ex) {
            ex.printStackTrace();
        this.setSize(700, 700);
        gBuffer = new BufferedImage((int)rWidth, (int)rHeight, BufferedImage.TYPE_INT_ARGB);
    /** This method is called from within the init() method to
     * initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is
     * always regenerated by the Form Editor.
    // <editor-fold defaultstate="collapsed" desc="Generated Code">                         
    private void initComponents() {
        canvas1 = new mycanvas();
        jScrollBarPoints = new javax.swing.JScrollBar();
        jLabelNoPoints = new javax.swing.JLabel();
        canvas1.addMouseListener(new java.awt.event.MouseAdapter() {
            public void mousePressed(java.awt.event.MouseEvent evt) {
                canvas1MousePressed(evt);
        jScrollBarPoints.setMaximum(25);
        jScrollBarPoints.setMinimum(3);
        jScrollBarPoints.setOrientation(javax.swing.JScrollBar.HORIZONTAL);
        jScrollBarPoints.addAdjustmentListener(new java.awt.event.AdjustmentListener() {
            public void adjustmentValueChanged(java.awt.event.AdjustmentEvent evt) {
                jScrollBarPointsAdjustmentValueChanged(evt);
        jLabelNoPoints.setText("3");
        org.jdesktop.layout.GroupLayout layout = new org.jdesktop.layout.GroupLayout(this);
        this.setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
            .add(layout.createSequentialGroup()
                .addContainerGap()
                .add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.TRAILING)
                    .add(org.jdesktop.layout.GroupLayout.LEADING, jScrollBarPoints, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, 400, Short.MAX_VALUE)
                    .add(org.jdesktop.layout.GroupLayout.LEADING, canvas1, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, 400, Short.MAX_VALUE))
                .add(18, 18, 18)
                .add(jLabelNoPoints, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 30, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE)
                .add(296, 296, 296))
        layout.setVerticalGroup(
            layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
            .add(layout.createSequentialGroup()
                .addContainerGap()
                .add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
                    .add(jLabelNoPoints)
                    .add(layout.createSequentialGroup()
                        .add(jScrollBarPoints, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE)
                        .addPreferredGap(org.jdesktop.layout.LayoutStyle.RELATED)
                        .add(canvas1, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 452, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE)))
                .add(20, 20, 20))
    }// </editor-fold>                       
    private void canvas1MousePressed(java.awt.event.MouseEvent evt) {                                    
        Graphics g = gBuffer.getGraphics ();
        g.setColor (Color.RED);
        g.fillOval (evt.getX (), evt.getY (), 10, 10);
        g.setColor (Color.BLUE);
        g.drawOval (evt.getX(), evt.getY(), 10, 10);
    private void jScrollBarPointsAdjustmentValueChanged(java.awt.event.AdjustmentEvent evt) {                                                       
        jLabelNoPoints.setText(""+jScrollBarPoints.getValue());
    // Variables declaration - do not modify                    
    private java.awt.Canvas canvas1;
    private javax.swing.JLabel jLabelNoPoints;
    private javax.swing.JScrollBar jScrollBarPoints;
    // End of variables declaration                  
    public class mycanvas extends java.awt.Canvas {
        public void paint(Graphics g){
            super.paint (g);
            g.drawImage (gBuffer, 0, 0, null);
}still nothing? is it so difficult to do such an easy thing?