//MyCanvasObserve.java
//
//Class to observe changes to the listener canvas
//
//Naomi, Vicky, Christie   



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


class MyCanvasObserve extends Canvas implements CanvasObserver 
{

  int downx = 0, downy = 0, upx = 0, upy = 0, height=0, width=0, startX=0, 
      startY=0;

  //  int isDraw = 0; // 0 = don't draw, 1 = draw

  MyCanvasListen myLCanvas = new MyCanvasListen();



  //***********************
  //
  //  init
  //
  //***********************
  public void init(){

  }// end init

  
  //***********************
  //
  //  MyCanvasObserve
  //
  //***********************
  public MyCanvasObserve(MyCanvasListen LCanvas)
  {
    myLCanvas = LCanvas;
    
    setBackground(Color.pink);
    setSize(200,200);

  }// end MyCanvasObserve  
   


  //***********************
  //
  //  canvasHasChanged
  //
  //***********************
  public void canvasHasChanged(MyCanvasListen LCanvas)
  {
    repaint();
  
  }// end canvasHasChanged


  //***********************
  //
  //  paint
  //
  //***********************
  public void paint( Graphics g )
  {

    downx = myLCanvas.get_downx();
    downy = myLCanvas.get_downy();
    
    upx = myLCanvas.get_upx();
    upy = myLCanvas.get_upy();

    
    g.setColor(Color.black);
    

    if( downx >= upx ) //Determine the width and the coord. for the upper-left 
      {                //edge of the rect, which will be the smaller of the 2
	width = (downx-upx); // numbers (either upx or downx)
	startX = upx;                         
      }
    else
      {   
	width=(upx-downx);
	startX = downx;
      }
    
    if( downy >= upy )
      {
	height = (downy-upy);
	startY = upy;
      }  
    else
      {
	height=(upy-downy);
	startY = downy;
      }

    // if (!(startX == 0 && startY == 0))
    //  isDraw = 1;


    //if (isDraw == 1)
      g.drawOval(startX, startY, width, height);


  }// end paint
  
}// end class MyCanvasObserve