//*****************************************************************************
// ColorCanvas.java
//
// 3/11/00
//
// Geetika Tewari, Victoria Manfredi and Christie Rice
//
//
//*****************************************************************************

import java.awt.*;
import java.awt.event.*;
import java.applet.*;
import java.io.*;
import java.util.*;



public class ColorCanvas extends Canvas 
{
  
  String headerstr;

  ColorFrame cf;

  Vector observers;


  //***********************************
  //
  //  constructor  
  //
  //***********************************  
  ColorCanvas(ColorFrame cff)
  {
    super();
    
    cf = cff;

    headerstr  = "COLOR MATRIX";

    // Set the size and the background color of the ColorCanvas canvas
    setSize(185,70);
    setBackground(Color.white);

    addMouseListener(new ColorMouseHandler (cf));

    observers = new Vector();

    
  }// end constructor


  
  //********************************
  //
  //  paint
  //
  //********************************
  public void paint(Graphics g)
  {
    g.setColor(Color.black);
    g.drawString(headerstr, 40, 16);
    
    // draw the possible static colors that can be chosen
    g.setColor(cf.StaticColor[0]);
    g.fillRect(20, 23, 15, 15);
    g.setColor(cf.StaticColor[1]);
    g.fillRect(35, 23, 15, 15);
    g.setColor(cf.StaticColor[2]);
    g.fillRect(50, 23, 15, 15);
    g.setColor(cf.StaticColor[3]);
    g.fillRect(65, 23, 15, 15);
    g.setColor(cf.StaticColor[4]);
    g.fillRect(80, 23, 15, 15);
    g.setColor(cf.StaticColor[5]);
    g.fillRect(95, 23, 15, 15);
    g.setColor(cf.StaticColor[6]);
    g.fillRect(110, 23, 15, 15);
    g.setColor(cf.StaticColor[7]);
    g.fillRect(125, 23, 15, 15);
    g.setColor(cf.StaticColor[8]);
    g.fillRect(140, 23, 15, 15);
    g.setColor(cf.StaticColor[9]);
    g.fillRect(155, 23, 15, 15);



    // This line is very important!  Observers will be notified to 
    // changes in ColorCanvas because whenever the repaint method of
    // ColorCanvas is called, cf.curc changes and therefore the 
    // ColorCanvas class changes => Therefore observers are notified.
    g.setColor(cf.curc);



    // draw the initial user contol colors that can be chosen
    g.setColor(cf.UserColor[0]);
    g.fillRect(20, 42, 15, 15);
    g.setColor(cf.UserColor[1]);
    g.fillRect(35, 42, 15, 15);
    g.setColor(cf.UserColor[2]);
    g.fillRect(50, 42, 15, 15);
    g.setColor(cf.UserColor[3]);
    g.fillRect(65, 42, 15, 15);
    g.setColor(cf.UserColor[4]);
    g.fillRect(80, 42, 15, 15);
    g.setColor(cf.UserColor[5]);
    g.fillRect(95, 42, 15, 15);
    g.setColor(cf.UserColor[6]);
    g.fillRect(110, 42, 15, 15);
    g.setColor(cf.UserColor[7]);
    g.fillRect(125, 42, 15, 15);
    g.setColor(cf.UserColor[8]);
    g.fillRect(140, 42, 15, 15);
    g.setColor(cf.UserColor[9]);
    g.fillRect(155, 42, 15, 15);


    notifyObservers();
  


  }// end paint
  



  //**************************
  //
  //  registerAsObserver
  //
  //**************************
  public void registerAsObserver(ColorCanvasObserver observer)
  {
    observers.addElement(observer);
    observer.ColorCanvasHasChanged(this);

  }// end registerAsObserver


  //**************************
  //
  //  notifyObservers
  //
  //**************************
  private void notifyObservers()
  {
    Enumeration enum = observers.elements();

    while(enum.hasMoreElements())
      {
	ColorCanvasObserver observer= (ColorCanvasObserver)enum.nextElement(); 
	observer.ColorCanvasHasChanged(this);

      }// end while

  }// end notifyObservers



}//end of class ColorCanvas