// This is a template with examples of several Applet widgets
// and processes.  Just edit in your specific needs and remove
// anything you don't need (see, in particular, the Threaded stuff
// which will cause paint() to be called over and over...
//

import java.applet.*;
import java.awt.*;
import java.awt.event.*;
import java.net.*;
import java.util.*;
import java.lang.*;

// use the old event model if you want to be compatible with Java 1.1.5

public class Sean2 extends Applet implements Runnable,
  ActionListener, ItemListener, AdjustmentListener,
  KeyListener, MouseListener, MouseMotionListener {

  /*
  Button button;
  Checkbox checkbox;
  Label label;
  Choice choice;
  Scrollbar scrollbar;
  Image image;
  String param;
  */

  Choice timeConstChoice, tempRangeChoice, stepChoice;
  Choice timeConstChoice2;
  Button playButt, resetButt;
  Image backImage, buffer;
  Graphics gb;

  boolean isPlaying = false;
  boolean clearGraph = true;

  final int t1y = 180;
  final int t2y = 110;
  final int t2x2y = 40;
  final int x0 = 90;

  int x = 0;
  int t_start = 20;
  int time = 0;
  boolean goUp = true;
  double Ti = 5.;
  double Tf = 20.;
  double Tv = 0.;
  double Tvalue = 0.;
  double tau = 100.;


  public void init() {

    // defining widgets
    timeConstChoice = new Choice();
    timeConstChoice.add("Time Constant \u03c4(s)");
    timeConstChoice.add("  1 s");
    timeConstChoice.add(" 10 s");
    timeConstChoice.add("100 s");
    timeConstChoice.addItemListener(this);

    timeConstChoice2 = new Choice();
    timeConstChoice2.add("Time Constant \u03c4(s)");
    timeConstChoice2.add("  1 s");
    timeConstChoice2.add(" 10 s");
    timeConstChoice2.add("100 s");
    timeConstChoice2.addItemListener(this);
    timeConstChoice2.setEnabled(false);

    tempRangeChoice = new Choice();
    tempRangeChoice.add("Temperature Range");
    tempRangeChoice.add(" [ T1, T2 ]");
    tempRangeChoice.add(" [ T1, 2 * T2 ]");
    tempRangeChoice.addItemListener(this);

    stepChoice = new Choice();
    stepChoice.add("Step up or down");
    stepChoice.add(" Up ");
    stepChoice.add("Down");
    stepChoice.addItemListener(this);

    playButt = new Button("   Play   ");
    playButt.addActionListener(this);
    playButt.setEnabled(false);

    resetButt = new Button(" Reset ");
    resetButt.addActionListener(this);
    resetButt.setEnabled(false);

    backImage = getImage(getDocumentBase(),"backgnd.gif");

    setLayout(null);

    Panel p1 = new Panel();
    p1.setLayout(new FlowLayout(FlowLayout.CENTER,30,5));
    p1.add(playButt);
    p1.add(resetButt);
    //p1.add(timeConstChoice2);

    Panel p2 = new Panel();
    p2.setLayout(new FlowLayout(FlowLayout.CENTER,20,5));
    p2.add(timeConstChoice);
    p2.add(tempRangeChoice);
    p2.add(stepChoice);

    Panel p3 = new Panel();
    p3.setLayout(new BorderLayout(20,5));
    p3.add("North",p2);
    p3.add("South",p1);

    p3.setBounds(0,265,548,60);
    add("South",p3);
    validate();
    repaint();

    /*

    // Generic code from the template follows for example only...

    button = new Button("Button");
    button.addActionListener(this);

    checkbox = new Checkbox("checkbox");
    checkbox.addItemListener(this);

    choice = new Choice();
    choice.add("one");
    choice.add("two");
    choice.addItemListener(this);

    // orientation, initial value, size of bubble, minimum, maximum
    scrollbar = new Scrollbar(Scrollbar.HORIZONTAL, 50, 10, 0, 110);
    scrollbar.addAdjustmentListener(this);

    label = new Label("The Label",Label.CENTER);

    // parsing parameters
    param = getParameter("parameter");
    if (param != null) {
      StringTokenizer st = new StringTokenizer(param, ",");
      int n = st.countTokens();
      for (int i=0; i<n; i++) {
        System.out.println("####  Parsing parameter = "+st.nextToken().trim());
      }
    }

    //using absolute layouts
    // setLayout(null);
    // button.setBounds(20,20,40,20); // x,y,width,height
    // Dimension ps = scrollbar.getPreferredSize();
    // scrollbar.setBounds(20,20,300,ps.height);
    // etc.

    add(button);
    add(checkbox);
    add(choice);
    add(scrollbar);
    add(label);

    //making integers from parameter Strings
    // int value = Integer.parseInt(param.trim());
    // int value = Integer.valueOf(param.trim()).intValue();
    // double value = Double.valueOf(param.trim()).doubleValue();


    //image = getImage(getDocumentBase(),"image.gif");
    //or use the loadImage("image.gif") below to load from JAR file or URL...

    //URL u = new URL(getDocumentBase(), "filename");
    //DataInputStream dis;
    //dis = new DataInputStream( new BufferedInputStream(u.openStream());
    //int val = dis.readInt();
    */

  }

  public void update(Graphics g) { paint(g); }

  public void paint(Graphics g) {
    if (clearGraph) {
      buffer = createImage(548,260);
      gb = buffer.getGraphics();
      gb.drawImage(backImage,0,0,null);
    }

    if (isPlaying) {
      time=time+1;
      if (time > 400) isPlaying = false;

      if (time <= t_start) {
        gb.setColor(Color.green);
        gb.drawLine(time+x0-1,(int)Math.round(Ti),time+x0,(int)Math.round(Tv));
        gb.setColor(Color.red);
        Tvalue = Ti;
        gb.drawLine(time+x0-1,(int)Math.round(Tvalue),time+x0,(int)Math.round(Tvalue));

      } else {
        gb.setColor(Color.green);
        gb.drawLine(time+x0-1,(int)Math.round(Tv),time+x0,(int)Math.round(Tf));
        gb.setColor(Color.red);
        double Tnew = Tf + (Ti - Tf)*Math.exp(- (time-t_start)/tau);
        gb.drawLine(time+x0-1,(int)Math.round(Tvalue),time+x0,(int)Math.round(Tnew));
        Tvalue = Tnew;
        Tv = Tf;
        

      }

    }

    g.drawImage(buffer,0,0,this);

  }

  // Listeners
  public void actionPerformed(ActionEvent e) {
    if (e.getSource() == playButt) {
      clearGraph = false;
      time = 0;
      int k = stepChoice.getSelectedIndex();
      if (k == 1) goUp = true;
      if (k == 2) goUp = false;

      k = timeConstChoice.getSelectedIndex();
      tau = 1.0;
      if (k == 2) tau = 10.0;
      if (k == 3) tau = 100.;
      playButt.setEnabled(true);
      
      k = tempRangeChoice.getSelectedIndex();
      if (k == 1) {
        if (goUp) {
          Ti = t1y;
          Tf = t2y;
        } else {
          Ti = t2y;
          Tf = t1y;
        }
      } else if (k == 2) {
        if (goUp) {
          Ti = t1y;
          Tf = t2x2y;
        } else {
          Ti = t2x2y;
          Tf = t1y;
        }
      }

      Tv = Ti;
      Tvalue = Tv;
      
      isPlaying = true;
      repaint();
      playButt.setEnabled(false);
      resetButt.setEnabled(true);

    } else if (e.getSource() == resetButt) {
      playButt.setEnabled(true);
      isPlaying = false;
      clearGraph = true;
      repaint();
    }

    /*
    //Generic code from the template follows for example only
    System.out.println("####  ActionEvent for "+e.getSource());
    if (e.getSource() == button) {
      System.out.println("####  The button was pressed");
    }
    */
  }

  public void itemStateChanged(ItemEvent e) {
  System.out.println("####  "+timeConstChoice.getSelectedIndex());

    if (timeConstChoice.getSelectedIndex() < 1 ||
        tempRangeChoice.getSelectedIndex() < 1 ||
        stepChoice.getSelectedIndex() < 1) {
      playButt.setEnabled(false);
    } else {
      playButt.setEnabled(true);
    }

    /*
    //Generic code from the template follows for example only
    System.out.println("####  ItemEvent for "+e.getSource());
    if (e.getSource() == checkbox) {
      System.out.println("####  Checkbox set to "+checkbox.getState());
    }

    if (e.getSource() == choice) {
      System.out.println("####  Choice selected "+choice.getSelectedItem());
    }
    */
  }

  public void adjustmentValueChanged(AdjustmentEvent e) {
    /*
    //Generic code from the template follows for example only
    System.out.println("####  AdjustmentEvent for "+e.getSource());
    if (e.getSource() == scrollbar) {
      System.out.println("####  Scrollbar value = "+scrollbar.getValue());
    }
    */
  }


  // for MouseListener
  public void mouseClicked(MouseEvent e) {
    int mx = e.getX();
    int my = e.getY();
  }
  public void mouseEntered(MouseEvent e) {}
  public void mouseExited(MouseEvent e) {}
  public void mousePressed(MouseEvent e) {}
  public void mouseReleased(MouseEvent e) {}

  //for MouseMotionListener
  public void mouseDragged(MouseEvent e) {}
  public void mouseMoved(MouseEvent e) {}

  //for KeyListener
  public void keyPressed(KeyEvent e) {
    int k = e.getKeyCode();
    char ck = e.getKeyChar();
  }
  public void keyReleased(KeyEvent e) {}
  public void keyTyped(KeyEvent e) {}


  // next, handle running a Thread to automatically repaint
  // the display every "refreshRate" milliseconds
  // NOTE -- This will cause paint() to be done repeatedly!!

  private Thread animator_thread = null;
  private boolean isRunning;
  int refreshRate = 100;

  public void start() {
    if (animator_thread == null) {
      isRunning = true;
      animator_thread = new Thread(this);
      animator_thread.start();
    }
  }

  public void stop() {
    if ((animator_thread != null) && animator_thread.isAlive()) {
      isRunning = false;
      animator_thread.stop();
    }
    animator_thread = null;
  }

  public void run () {

    while (isRunning) {
      try { Thread.sleep(refreshRate); 
        repaint();
      } catch (Exception re) {
        System.out.println("####  "+re);
      }
    }
  }


  // Utilities for getting images and audio clips from JAR or URL
  public Image loadImage(String name) {
    // first try the URL

    Image img = null;
    URL u = getClass().getResource( (String) name);
    if (u == null) {
      u = getDocumentBase();
      img = getImage(u,name);
    } else {
      img = getImage(u);
    }

		MediaTracker mt = new MediaTracker(this);
		mt.addImage(img, 0);
		try   { mt.waitForAll(); }
		catch ( Exception ex ) {img = null; }
    return img;

  }

  public AudioClip loadAudioClip(String name) {
    // first try the URL

    AudioClip auc = null;
    URL u = getClass().getResource( (String) name);
    if (u == null) {
      u = getDocumentBase();
      auc = getAudioClip(u,name);
    } else {
      auc = getAudioClip(u);
    }

    return auc;

  }

}