How to make a oval shape in java

how to make an oval shape in java

here's a simple example:
import java.applet.Applet;
import java.awt.Graphics;
import java.awt.Color;
/* <applet code="OvalTest" width=83 height=43></applet> */
public class OvalTest extends Applet {
     public void init() {
          setBackground(Color.white);
     public void paint(Graphics g) {
          g.setColor(Color.blue);
          g.fillOval(1,1,80,40);
}

Similar Messages

  • How can I change  oval shape applet to (plot)

    Hi this is not my code so, the orignal code is freeware to www.neuralsemantics.com and is Copyright 1989 by Rich Gopstein and Harris Corporation.
    The site allows permission to play with the code or ammend it.
    how could I modify the applet to display (plot) several cycles of the audio signal instead of the elliptical shape. The amplitude and period of the waveform should change in accordance with the moving sliders
    Here is the code from www.neuralsemantics.com /applets/jazz.html
    import java.applet.*;
    import java.awt.*;
    import java.awt.event.*;
    public class JazzMachine extends Applet
                 implements Runnable, AdjustmentListener, MouseListener {
      // program name
      final static String TITLE = "The jazz machine";
      // Line separator char
      final static String LSEP = System.getProperty("line.separator");
      // Value range
      final static int MIN_FREQ = 1;   // min value for barFreq
      final static int MAX_FREQ = 200; // max value for barFreq
      final static int MIN_AMPL = 0;   // min value for barVolume
      final static int MAX_AMPL = 100; // max value for barVolume
      // Sun's mu-law audio rate = 8KHz
      private double rate = 8000d;      
      private boolean audioOn = false;     // state of audio switch (on/off)
      private boolean changed = true;      // change flag
      private int freqValue = 1;           // def value of frequency scrollbar
      private int amplValue = 70;          // def value of volume scrollbar
      private int amplMultiplier = 100;    // volume multiplier coeff
      private int frequency, amplitude;    // the requested values
      private int soundFrequency;          // the actual output frequency
      // the mu-law encoded sound samples
      private byte[] mu;
      // the audio stream
      private java.io.InputStream soundStream;
      // graphic components
      private Scrollbar barVolume, barFreq;
      private Label labelValueFreq;
      private Canvas canvas;   
      // flag for frequency value display
      private boolean showFreq = true;
      // width and height of canvas area
      private int cw, ch;
      // offscreen Image and Graphics objects
      private Image img;
      private Graphics graph;
      // dimensions of the graphic ball
      private int ovalX, ovalY, ovalW, ovalH;
      // color of the graphic ball
      private Color ovalColor;
      // default font size
      private int fontSize = 12;
      // hyperlink objects
      private Panel linkPanel;
      private Label labelNS;
      private Color inactiveLinkColor = Color.yellow;
      private Color activeLinkColor = Color.white;
      private Font inactiveLinkFont = new Font("Dialog", Font.PLAIN, fontSize);
      private Font activeLinkFont = new Font("Dialog", Font.ITALIC, fontSize);
      // standard font for the labels
      private Font ctrlFont;
      // standard foreground color for the labels
      private Color fgColor = Color.white;
      // standard background color for the control area
      private Color ctrlColor = Color.darkGray;
      // standard background color for the graphic ball area
      private Color bgColor = Color.black;
      // start value for the time counter
      private long startTime;
      // maximum life time for an unchanged sound (10 seconds)
      private long fixedTime = 10000;
      // animation thread
      Thread runner;
    //                             Constructors
      public JazzMachine() {
    //                                Methods
      public void init() {
        // read applet <PARAM> tags
        setAppletParams();
        // font for the labels
        ctrlFont = new Font("Dialog", Font.PLAIN, fontSize);
        // convert scrollbar values to real values (see below for details)
        amplitude = (MAX_AMPL - amplValue) * amplMultiplier;
        frequency = (int)Math.pow(1.2d, (double)(freqValue + 250) / 10.0);
        setLayout(new BorderLayout());
        setBackground(ctrlColor);
        setForeground(fgColor);
        Label labelVolume = new Label(" Volume ");
        labelVolume.setForeground(fgColor);
        labelVolume.setAlignment(Label.CENTER);
        labelVolume.setFont(ctrlFont);
        barVolume = new Scrollbar(Scrollbar.VERTICAL, amplValue, 1,
                         MIN_AMPL, MAX_AMPL + 1);
        barVolume.addAdjustmentListener(this);
        // assign fixed size to the scrollbar
        Panel pVolume = new Panel();
        pVolume.setLayout(null);
        pVolume.add(barVolume);
        barVolume.setSize(16, 90);
        pVolume.setSize(16, 90);
        Label labelFreq = new Label("Frequency");
        labelFreq.setForeground(fgColor);
        labelFreq.setAlignment(Label.RIGHT);
        labelFreq.setFont(ctrlFont);
        barFreq = new Scrollbar(Scrollbar.HORIZONTAL, freqValue, 1,
                      MIN_FREQ, MAX_FREQ);
        barFreq.addAdjustmentListener(this);
        // assign fixed size to the scrollbar
        Panel pFreq = new Panel();
        pFreq.setLayout(null);
        pFreq.add(barFreq);
        barFreq.setSize(140, 18);
        pFreq.setSize(140, 18);
        // show initial frequency value
        labelValueFreq = new Label();
        if (showFreq) {
          labelValueFreq.setText("0000000 Hz");
          labelValueFreq.setForeground(fgColor);
          labelValueFreq.setAlignment(Label.LEFT);
          labelValueFreq.setFont(ctrlFont);
        Panel east = new Panel();
        east.setLayout(new BorderLayout(10, 10));
        east.add("North", labelVolume);
        Panel pEast = new Panel();
        pEast.add(pVolume);
        east.add("Center", pEast);
        Panel south = new Panel();
        Panel pSouth = new Panel();
        pSouth.setLayout(new FlowLayout(FlowLayout.CENTER));
        pSouth.add(labelFreq);
        pSouth.add(pFreq);
        pSouth.add(labelValueFreq);
        south.add("South", pSouth);
        linkPanel = new Panel();
        this.composeLink();
        Panel west = new Panel();
        // dummy label to enlarge the panel
        west.add(new Label("      "));
        add("North", linkPanel);
        add("South", south);
        add("East", east);
        add("West", west);
        add("Center", canvas = new Canvas());
      private void composeLink() {
        linkPanel.setLayout(new FlowLayout(FlowLayout.CENTER, 0, 5));
        linkPanel.setFont(inactiveLinkFont);
        linkPanel.setForeground(Color.yellow);
        Label labelName = new Label(TITLE + " \u00a9");
          labelName.setForeground(inactiveLinkColor);
          labelName.setAlignment(Label.RIGHT);
        labelNS = new Label(" Neural Semantics   ");
          labelNS.setForeground(inactiveLinkColor);
          labelNS.setFont(inactiveLinkFont);
          labelNS.setAlignment(Label.LEFT);
        linkPanel.add(labelName);
        linkPanel.add(labelNS);
        // link to Neural Semantics website
        String h = getDocumentBase().getHost();
        if ((h.length() > 4) && (h.substring(0, 4).equals("www.")))
          h = h.substring(4);
        if ((h != null) && (! h.startsWith("neuralsemantics.com"))) {
          // create a hand cursor for the hyperlink area
          Cursor linkCursor = new Cursor(Cursor.HAND_CURSOR);
          linkPanel.setCursor(linkCursor);
          labelName.addMouseListener(this);
          labelNS.addMouseListener(this);
      private void switchAudio(boolean b) {
        // switch audio to ON if b=true and audio is OFF
        if ((b) && (! audioOn)) {
          try {
            sun.audio.AudioPlayer.player.start(soundStream);
          catch(Exception e) { }
          audioOn = true;
        // switch audio to OFF if b=false and audio is ON
        if ((! b) && (audioOn)) {
          try {
            sun.audio.AudioPlayer.player.stop(soundStream);
          catch(Exception e) { }
          audioOn = false;
      private void getChanges() {
        // create new sound wave
        mu = getWave(frequency, amplitude);
        // show new frequency value
        if (showFreq)
          labelValueFreq.setText((new Integer(soundFrequency)).toString() + " Hz");
        // shut up !
        switchAudio(false);
        // switch audio stream to new sound sample
        try {
          soundStream = new sun.audio.ContinuousAudioDataStream(new
                            sun.audio.AudioData(mu));
        catch(Exception e) { }
        // listen
        switchAudio(true);
        // Adapt animation settings
        double prop = (double)freqValue / (double)MAX_FREQ;
        ovalW = (int)(prop * cw);
        ovalH = (int)(prop * ch);
        ovalX = (int)((cw - ovalW) / 2);
        ovalY = (int)((ch - ovalH) / 2);
        int r = (int)(255 * prop);
        int b = (int)(255 * (1.0 - prop));
        int g = (int)(511 * (.5d - Math.abs(.5d - prop)));
        ovalColor = new Color(r, g, b);
        // start the timer
        startTime = System.currentTimeMillis();
        // things are fixed
        changed = false;
    //                               Thread
      public void start() {
        // create thread
        if (runner == null) {
          runner = new Thread(this);
          runner.start();
      public void run() {
        // infinite loop
        while (true) {
          // Volume or Frequency has changed ?
          if (changed)
            this.getChanges();
          // a touch of hallucination
          repaint();
          // let the children sleep. Shut up if inactive during more
          // than the fixed time.
          if (System.currentTimeMillis() - startTime > fixedTime)
            switchAudio(false);
          // let the computer breath
          try { Thread.sleep(100); }
          catch (InterruptedException e) { }
      public void stop() {
        this.cleanup();
      public void destroy() {
        this.cleanup();
      private synchronized void cleanup() {
        // shut up !
        switchAudio(false);
        // kill the runner thread
        if (runner != null) {
          try {
            runner.stop();
            runner.join();
            runner = null;
          catch(Exception e) { }
    //                     AdjustmentListener Interface
      public void adjustmentValueChanged(AdjustmentEvent e) {
        Object source = e.getSource();
        // Volume range : 0 - 10000
        // ! Scrollbar value range is inverted.
        // ! 100 = multiplier coefficient.
        if (source == barVolume) {
          amplitude = (MAX_AMPL - barVolume.getValue()) * amplMultiplier;
          changed = true;
        // Frequency range : 97 - 3591 Hz
        // ! Scrollbar value range represents a logarithmic function.
        //   The purpose is to assign more room for low frequency values.
        else if (source == barFreq) {
          freqValue = barFreq.getValue();
          frequency = (int)Math.pow(1.2d, (double)(freqValue + 250) / 10.0);
          changed = true;
    //                     MouseListener Interface
      public void mouseClicked(MouseEvent e) {
      public void mouseEntered(MouseEvent e) {
        // text color rollover
        labelNS.setForeground(activeLinkColor);
        labelNS.setFont(activeLinkFont);
        showStatus("Visit Neural Semantics");
      public void mouseExited(MouseEvent e) {
        // text color rollover
        labelNS.setForeground(inactiveLinkColor);
        labelNS.setFont(inactiveLinkFont);
        showStatus("");
      public void mousePressed(MouseEvent e) {
        try {
          java.net.URL url = new java.net.URL("http://www.neuralsemantics.com/");
          AppletContext ac = getAppletContext();
          if (ac != null)
            ac.showDocument(url);
        catch(Exception ex){ }
      public void mouseReleased(MouseEvent e) {
    //                              Painting
      public void update(Graphics g) {
        Graphics canvasGraph = canvas.getGraphics();
        if (img == null) {
          // get canvas dimensions
          cw = canvas.getSize().width;
          ch = canvas.getSize().height;
          // initialize offscreen image
          img = createImage(cw, ch);
          graph = img.getGraphics();
        // offscreen painting
        graph.setColor(bgColor);
        graph.fillRect(0, 0, cw, ch);
        graph.setColor(ovalColor);
        graph.fillOval(ovalX, ovalY, ovalW, ovalH);
        // canvas painting
        if (canvasGraph != null) {
          canvasGraph.drawImage(img, 0, 0, canvas);
          canvasGraph.dispose();
    //                          Sound processing
      // Creates a sound wave from scratch, using predefined frequency
      // and amplitude.
      private byte[] getWave(int freq, int ampl) {
        int lin;
        // calculate the number of samples in one sinewave period
        // !! change this to multiple periods if you need more precision !!
        int nSample = (int)(rate / freq);
        // calculate output wave frequency
        soundFrequency = (int)(rate / nSample);
        // create array of samples
        byte[] wave = new byte[nSample];
        // pre-calculate time interval & constant stuff
        double timebase = 2.0 * Math.PI * freq / rate;
        // Calculate samples for a single period of the sinewave.
        // Using a single period is no big precision, but enough
        // for this applet anyway !
        for (int i=0; i<nSample; i++) {
          // calculate PCM sample value
          lin = (int)(Math.sin(timebase * i) * ampl);
          // convert it to mu-law
          wave[i] = linToMu(lin);
        return wave;
      private static byte linToMu(int lin) {
        int mask;
        if (lin < 0) {
          lin = -lin;
          mask = 0x7F;
        else  {
          mask = 0xFF;
        if (lin < 32)
          lin = 0xF0 | 15 - (lin / 2);
        else if (lin < 96)
          lin = 0xE0 | 15 - (lin-32) / 4;
        else if (lin < 224)
          lin = 0xD0 | 15 - (lin-96) / 8;
        else if (lin < 480)
          lin = 0xC0 | 15 - (lin-224) / 16;
        else if (lin < 992)
          lin = 0xB0 | 15 - (lin-480) / 32;
        else if (lin < 2016)
          lin = 0xA0 | 15 - (lin-992) / 64;
        else if (lin < 4064)
          lin = 0x90 | 15 - (lin-2016) / 128;
        else if (lin < 8160)
          lin = 0x80 | 15 - (lin-4064) / 256;
        else
          lin = 0x80;
        return (byte)(mask & lin);
    //                             Applet info
      public String getAppletInfo() {
        String s = "The jazz machine" + LSEP + LSEP +
                   "A music synthetizer applet" + LSEP +
                   "Copyright (c) Neural Semantics, 2000-2002" + LSEP + LSEP +
                   "Home page : http://www.neuralsemantics.com/";
        return s;
      private void setAppletParams() {
        // read the HTML showfreq parameter
        String param = getParameter("showfreq");
        if (param != null)
          if (param.toUpperCase().equals("OFF"))
            showFreq = false;
        // read the HTML backcolor parameter
        bgColor = changeColor(bgColor, getParameter("backcolor"));
        // read the HTML controlcolor parameter
        ctrlColor = changeColor(ctrlColor, getParameter("controlcolor"));
        // read the HTML textcolor parameter
        fgColor = changeColor(fgColor, getParameter("textcolor"));
        // read the HTML fontsize parameter
        param = getParameter("fontsize");
        if (param != null) {
          try {
            fontSize = Integer.valueOf(param).intValue();
          catch (NumberFormatException e) { }
      private Color changeColor(Color c, String s) {
        if (s != null) {
          try {
            if (s.charAt(0) == '#')
              c = new Color(Integer.valueOf(s.substring(1), 16).intValue());
            else
              c = new Color(Integer.valueOf(s).intValue());
          catch (NumberFormatException e) { e.printStackTrace(); }
        return c;
    }thanks LIZ
    PS If you can help how do I Give the Duke dollers to you

    http://www.google.ca/search?q=java+oval+shape+to+plot&hl=en&lr=&ie=UTF-8&oe=UTF-8&start=10&sa=N
    Ask the guy who made it for more help

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