// File jmhCircleListener.java

import java.applet.Applet ;  // removed by JMH, no longer needed
import java.awt.* ;             // required for Graphics class methods
import java.awt.event.* ;       // required for listeners

import java.util.* ;  // added by JMH for the Vector class


/** The listener used by jmhCircleDrawer1. Note call
 *  to getSource to obtain reference to the applet.
 *  <P>
 *  Taken from Core Web Programming Java 2 Edition
 *  from Prentice Hall and Sun Microsystems Press,
 *  http://www.corewebprogramming.com/.
 *  May be freely used or adapted.
 *
 *  <p>This class handles all events.  Note that it <b>extends</b>
 *  <code>MouseAdapter</code> (a concrete class with "do-nothing" default
 *  implementations of all methods), so it does not have to implement all
 *  of the methods in that class.  However, it <b>implements</b>
 *  <code>MouseMotionListener</code> (an abstract class), so it must
 *  implement all methods in that class or it will itself be abstract.</p>
 *
 *  @author  Francis F. Fernandes, fffernan@cs.uml.edu
 *  @version  updated by FFF on April 18, 2002 at 03:43 PM
 */
public class jmhCircleListener extends MouseAdapter implements MouseMotionListener, KeyListener


{


  /** radius of points drawn, Hall & Brown original code */
  private int radius = 25 ;
  
  /** the applet that instantiates this class */
  jmhCircleDrawer1 app = null ;

  /** the graphics context of the instantiating applet */
  Graphics g = null ;

  /** Vector of points drawn by user */
  public Vector vecPoints = new Vector() ;

  /** number of current drawing color */
  int nColor = 0 ;

	/** number of current drawing color */
  int intXstart = 0 ;
	
	/** number that is the x-coordinate for the line drawer*/
	int intXline = -50;
	/** number that is the y-coordinate for the line drawer*/
	int intYline = -50;

	/** number that is the x-coordinate for the line drawer FFF */
	int intXlineb = -50;

	/** number that is the y-coordinate for the line drawer FFF*/
	int intYlineb = -50;

  /** 2-argument constructor
   *  @param  app  Applet object that instantiated this instance
   *  @param  g    Graphics object for that applet
   */
  jmhCircleListener( jmhCircleDrawer1 app, Graphics g )
  {
    this.app = app ;
    this.g = g ;

    // find current color in array of colors
    for ( int k = 0 ; k < app.colors.length ; k++ )
      // if ( app.getForeground() == colors[k] )
      if ( g.getColor() == app.colors[k] )
        nColor = k ;
  }


  /** this function provides access to the private data member (instance variable)
   *  @return  radius of points drawn
   */
  int getRadius()
  {
    return radius ;
  }
  /** this function handles all of the events when a keys are typed FFF
   * @param event KeyEvent object that is take from the keyboard
   */
  public void keyTyped(KeyEvent event)
		{
			if(this.app.lastX>0)
			{
				//Sets some options, font and color, for the text that is going to be typed
				g.setFont(this.app.font);
				g.setColor( this.app.colors[nColor]);

				//Gets the input from the user and puts it in a string code
				String s = String.valueOf(event.getKeyChar()); 
				//System.out.println((int) s.charAt(0) );
				
        //this handles the user from a-z A-Z and other punctuations
				if( ((int)s.charAt(0)>=97 && (int)s.charAt(0)<=122) || ((int)s.charAt(0)>=65 && (int)s.charAt(0)<=90) || ((int)s.charAt(0)>=33 && (int)s.charAt(0)<=50))
				{
					if(this.app.lastX>510)
						{
						this.app.lastX=100;
						this.app.lastY=this.app.lastY+this.app.fm.getHeight() - 5;
						}
					//draws the string on the screen
					g.drawString(s, this.app.lastX, this.app.lastY);
					
					//stores it in the vector so repaint can put it back when screen needs to be refreshed
					vecPoints.add( new jmhPointData(this.app.lastX ,this.app.lastY, g.getColor(), s, 0 ,0));
					
					//moves the "cursor" over so it can type the next character
					this.app.lastX=this.app.lastX+this.app.fm.stringWidth(s)+1;
				}

				//handles space character
				else if( (int)s.charAt(0)==32 )  
					{
					this.app.lastX=this.app.lastX+6;
					}

				//return is entered to wrap to next line under first typed letter
				else if( (int)s.charAt(0)==10 )  
					{
					this.app.lastX=intXstart;
					this.app.lastY=this.app.lastY+this.app.fm.getHeight() - 5;
					}

				//tab is entered to wrap to next line
				else if( (int)s.charAt(0)==9 )  
					{
					if(this.app.lastX>440)
						{
						this.app.lastX=100;
						this.app.lastY=this.app.lastY+this.app.fm.getHeight() - 5;
						}
					this.app.lastX=this.app.lastX+10;
					}
			}
    }
  /** This function handles events that happen after a key is released. FFF
   *  The F1- help screen is implemented in here.
   *  @ param event A keyEvent object that handles input frm the keyboard after a key is released
   */
		public void keyReleased(KeyEvent event)
    {
		//handles F1 FFF
		if((int)event.getKeyCode()==112)
		  {
			//needs to reset the clipping so it can print under the drawing area 
			g.setClip( 0, 0,1000, 1000) ;

			//Sets it to Blue text FFF
			g.setColor( this.app.colors[1]);  //sets the color to be typed

			//prints the message FFF
			g.drawString("Help Menu", 3, this.app.intBottomclip+35);
			g.drawString("- shift click the screen to enter text typing mode", 3, this.app.intBottomclip+50);
			g.drawString("  press shift and control simultaneously to exit typing mode", 3, this.app.intBottomclip+65);
			g.drawString("  text mode supports tab, carriage return, and word wrapping", 3, this.app.intBottomclip+80);
			g.drawString("- pressing alt with a number will change the text color", 3, this.app.intBottomclip+95);
			g.drawString("- to draw a line Alt-click on the start point ,then Alt-click again on the finish point", 3, this.app.intBottomclip+110);
			g.drawString("- press x to clear this window and the Error Message box", 3, this.app.intBottomclip+125);
			g.drawString("- press ALT-U to undo the last command", 3, this.app.intBottomclip+140);

			//puts the Clipping back to where it was FFF			
			g.setClip( this.app.intColorPanelWidth, this.app.intColorPanelTopY, 1000, this.app.intBottomclip+1) ;
			System.out.println("open help");
			}
		// added by FFF to change the color when Alt and the corresoposing number is pressed
			if(event.getKeyChar()=='x' && !event.isAltDown())
				{
				app.repaint();
			  System.out.println("clear status");
				}

			//Undo command FFF
				else if( event.isAltDown() && event.getKeyChar()=='u')
					{
					
					vecPoints.remove(vecPoints.size()-1);
					System.out.println("Undo");
					app.repaint();
					}

			//These change the color of the drawing tool to the specified color
				else if( event.isAltDown() && event.getKeyChar()=='1')
					{
					System.out.println("1");
					nColor=0;
					app.repaint();  //gets rid of error if there was one
					}

				else if ( event.isAltDown() && event.getKeyChar()=='2')
					{
					System.out.println("2");
					nColor=1;
					app.repaint();  //gets rid of error if there was one
					}

				else if ( event.isAltDown() && event.getKeyChar()=='3')
					{
					System.out.println("3");
					nColor=2;
					app.repaint();  //gets rid of error if there was one
					}

				else if ( event.isAltDown() && event.getKeyChar()=='4')
					{
					System.out.println("4");
					nColor=3;
					app.repaint();  //gets rid of error if there was one
					}

				else if ( event.isAltDown() && event.getKeyChar()=='5')
					{
					System.out.println("5");
					nColor=4;
					app.repaint();  //gets rid of error if there was one
					}
      
				else if ( event.isAltDown() && event.getKeyChar()=='6')
					{
					System.out.println("6");
					nColor=5;
					app.repaint();  //gets rid of error if there was one
					}

				else if ( event.isAltDown() && event.getKeyChar()=='7')
					{
					System.out.println("7");
					nColor=6;
					app.repaint();  //gets rid of error if there was one
					}
      
				else if ( event.isAltDown() && event.getKeyChar()=='8')
					{
					System.out.println("8");
					nColor=7;
					app.repaint();  //gets rid of error if there was one
					}
      
				else if ( event.isAltDown() && event.getKeyChar()=='9')
					{
					System.out.println("9");
					nColor=8;
					app.repaint();  //gets rid of error if there was one
					}
				
				else if ( event.isAltDown() && event.getKeyChar()=='0')
					{
					System.out.println("0");
					nColor=9;
					app.repaint();  //gets rid of error if there was one
					}

				
				//invalid alt combination
				else if ( event.isAltDown() ) 
					{
					
					System.out.println((int)event.getKeyChar());
					g.setColor( this.app.colors[0]);  //sets the color to be typed
					g.setClip( 0, 0,1000, 1000) ;
					g.drawString("Invalid Alt Combination Please Choose 0-9", 92, this.app.intBottomclip+16);
					g.setClip( this.app.intColorPanelWidth, this.app.intColorPanelTopY,
                 1000, this.app.intBottomclip+1) ;
					}
		}
  /** this function handles input when a key is pressed FFF
   *  @param event is a KeyEvent object to get input from the keyboard
   */
		public void keyPressed(KeyEvent event)
      {

			//if shift is down and control is down exit typing mode FFF
	 if ( event.isShiftDown() && event.isControlDown())
				{
				if(this.app.lastX>0)
					{
					this.app.lastX=-50;
					this.app.lastY=-50;
					System.out.println("alpha off");
					}
				}
		  }

  /** this function is called by the system when the mouse is clicked, that is,
   *  pressed and immediately released.
   *  (<i>This function was provided by the original Hall&amp;Brown program.</i>)
   *  @param  event  MouseEvent object supplied by system
   */
  public void mousePressed( MouseEvent event )
  {
    // following Hall & Brown code removed by JMH -- method uses the class' data
    //   members of the same names
    // Applet app = (Applet) event.getSource() ;
    // Graphics g = app.getGraphics() ;

		if(this.app.lastX >= -50)
			{
			//added by FFF for the line drawer
			if ( event.isAltDown() )
				{
				if(intXline<0)
					{
					//get first point
					intXline=event.getX();
					intYline=event.getY();
					//System.out.println("intXline");
					}
				else
					{
					//System.out.println("intXlineb");
					//get finish point FFF
					intXlineb=event.getX();
					intYlineb=event.getY();
					g.setColor( this.app.colors[nColor] ) ;
					g.drawLine(intXline, intYline,intXlineb, intYlineb);
					//add to vector array FFF
					vecPoints.add( new jmhPointData(intXline,intYline, g.getColor(),"line", intXlineb, intYlineb));
					intXline=-50;
					intYline=-50;
					}
				}

			// added by FFF to change colors when the shift key is held down
			else if ( event.isShiftDown() )
				{
				if(this.app.lastX>0)
					{
					this.app.lastX=-50;
					this.app.lastY=-50;
					System.out.println("alpha off");
				}
				if(this.app.lastX<0)
					{
					this.app.lastX=event.getX();
					this.app.lastY=event.getY();
					intXstart=this.app.lastX;
					System.out.println("alpha on");
					}
				}
			else if ( event.isControlDown() )
				{
				nColor = ( nColor + 1 ) % this.app.colors.length ;
				}
			
			

			// handle clicks in the color panel area
			else if ( event.getX() <= this.app.intColorPanelWidth && !event.isShiftDown() )
			{
				int k ;  // number of area clicked
				for ( k = 0 ; k <= this.app.colors.length ; k++ )
				{
					// test which color panel area contains the point clicked
					if ( new Rectangle( this.app.intColorPanelLeftX,
																this.app.intColorPanelTopY + this.app.intColorPanelHeight*k,
															this.app.intColorPanelWidth, this.app.intColorPanelHeight ).
											contains( event.getX(), event.getY() ) )
					{
						break ;
					}
				}

				// if the point clicked is in a color area, reset the drawing color
				if ( k < this.app.colors.length )
					nColor = k ;
				// if the point clicked is in the Clear Screen area, clear the Vector and repaint the 
				// screen
				else if ( k == this.app.colors.length )
				{
					vecPoints.clear() ;
					app.repaint() ;
				}
			}

			// handle clicks outside the color panel area
			else
			{
				// set the drawing color
				g.setColor( this.app.colors[nColor] ) ;
      
      
				// don't draw over the color panel
				g.setClip( this.app.intColorPanelWidth, app.intColorPanelTopY,
									 1000, this.app.intBottomclip+1) ;

				// draw a point (original Hall & Brown code)
				g.fillOval( event.getX()-radius,
										event.getY()-radius,
										2*radius,
										2*radius ) ;

				// save points so they can be replotted
				vecPoints.add( new jmhPointData( event.getX(), event.getY(), g.getColor(), "circle", 0 ,0) ) ;
			}
		}
		else
		{
		this.app.lastX=-50;
		System.out.println("this.app.lastX");
		}
  }


  /** this function must be defined even though it does nothing because
   *  this class <b>implements</b> <code>MouseMotionListener</code>, an abstract
   *  class, and therefore all methods in that abstract class must be implemented
   *  or the implementing class is itself abstract.
   *  @param  event  MouseEvent object supplied by system
   */
  public void mouseMoved( MouseEvent event )
  {
  }


  /** this function is called by the JRE (Java Runtime Environment) when the
   *  mouse is moved with the left mouse button held down
   *  @param  event  MouseEvent object supplied by system
   */
  public void mouseDragged( MouseEvent event )
  {
    mousePressed( event ) ;
  }
}