// Funky applet to draw some oscillating sine waves, remove one
// works because the dots are random enough that removing a wave
// at the peak isn't easy to notice.

import java.applet.*;
import java.awt.*;
import java.util.*;
import SinBox;

public class Disappear extends DoubleBufferApplet implements Runnable {
  Vector sinboxes;
  Vector activeSinboxes;
  Thread animationThread;
  int frameDelay = 100;
  SinBox selectedBox;
  long clickTime;
  
  public void init() {
    this.setBackground(Color.white);
    this.setForeground(Color.black);
    update(getGraphics());			  // force window create

    String frameDelayString = getParameter("frameDelay");
    try {
      if (frameDelayString != null)
	frameDelay = Integer.parseInt(frameDelayString);
    } catch (Exception e) {}

    sinboxes = new Vector(3);
    sinboxes.addElement(new SinBox(imageBufferSize.width/2, imageBufferSize.height/4, 0.3, 0.05));
    sinboxes.addElement(new SinBox(imageBufferSize.width/2, imageBufferSize.height/2, 0.7, 0.04));
    sinboxes.addElement(new SinBox(imageBufferSize.width/2, 3*imageBufferSize.height/4, 0.15, 0.06));
    activeSinboxes = new Vector(3);
    activeSinboxes.addElement(sinboxes.elementAt(1));
  }

  public void run() {
    while (Thread.currentThread() == animationThread) {
      clearImageBuffer();
      Graphics g = imageBuffer.getGraphics();

      // update active curves
      Enumeration e = activeSinboxes.elements();
      while (e.hasMoreElements()) {
	SinBox sb = (SinBox)e.nextElement();
	sb.updateCurve();
      }

      // render all curves
      e = sinboxes.elements();
      while (e.hasMoreElements()) {
	SinBox sb = (SinBox)e.nextElement();
	sb.render(g);
      }
      repaint();

      // test to see if we can remove one
      if (sinboxes.size() == 3) {
	boolean canRemove = true;
	e = sinboxes.elements();
	while (e.hasMoreElements() && canRemove) {
	  SinBox sb = (SinBox)e.nextElement();
	  if (!sb.nearMaximum())
	    canRemove = false;
	}
	if (canRemove) {
	  SinBox middleBox = (SinBox)sinboxes.elementAt(1);
	  sinboxes.removeElement((Object)middleBox);
	  activeSinboxes.removeElement(middleBox);
	  System.out.println("Poof");
	}
      }
      
      // sleep for next update..
      try {
	Thread.sleep(frameDelay);
      } catch (InterruptedException ex) {
	System.out.println("Sleep Interrupted??");
      }
    }
  }

  // thread toggle
  public boolean keyDown(Event e, int key) {
    if ((char)key == ' ') {
      if (animationThread == null) {
	animationThread = new Thread(this);
	animationThread.start();
      } else {
	animationThread.stop();
	animationThread = null;
      }
    }
    return true;
  }

  public void start() {
    super.start();
    animationThread = new Thread(this);
    animationThread.start();
  }

  public void stop() {
    animationThread = null;
    super.stop();
  }

  public boolean mouseDown(Event ev, int mouseX, int mouseY) {
    selectedBox = null;
    clickTime = System.currentTimeMillis();

    // figure out which wave was clicked
    Enumeration e = sinboxes.elements();
    while (e.hasMoreElements() && selectedBox == null) {
      SinBox sb = (SinBox)e.nextElement();
      if (sb.box.inside(mouseX, mouseY)) {
	selectedBox = sb;
      }
    }
    // toggle its active status
    if (selectedBox != null) {
      if (activeSinboxes.contains(selectedBox))
	activeSinboxes.removeElement(selectedBox);
      else
	activeSinboxes.addElement(selectedBox);
    }
    return true;
  }

  public void paint(Graphics og) {
    Graphics g = imageBuffer.getGraphics();
    Enumeration e = sinboxes.elements();
    while (e.hasMoreElements()) {
      SinBox sb = (SinBox)e.nextElement();
      sb.render(g);
    }
    super.paint(og);
  }
}