// Lars Sorensen TYJava in 21 days
// excode from pg 222
//
// 
//

  import java.awt.Graphics;
  import java.awt.Event;
  import java.awt.Color;
  import java.awt.Point;
 
  public class Lines extends java.applet.Applet
     {
	
     final int MAXLINES = 100;
       Point starts[] = new Point[MAXLINES]; // starting points
       Point ends[] = new Point[MAXLINES]; // ending points
       Point anchor; // start of current line
       Point currentpoint; // current end of line		
       int currline = 0;

      public void init()
        {
         setBackground(Color.white);
         setForeground(Color.blue);
        } // end of init

      public boolean mouseDown(Event evt, int x, int y)
 	{
          anchor = new Point(x,y);
	  return true;
        }	

      public boolean mouseUp(Event evt, int x, int y)
 	{
          if ( currline < MAXLINES) addline(x,y);
	  else System.out.println("Too many lines.");         
          return true;
        }	

      public boolean mouseDrag(Event evt, int x, int y)
 	{
          currentpoint = new Point(x,y);
	  repaint();         
          return true;
        }	

      public boolean keyDown(Event evt, int key)
        {
          if ( key == Event.HOME ) 
	    {
              setBackground(Color.white);
	      currline = 0;
              repaint();
	    }
          return true;
        }

      void addline(int x, int y)
	{
	  starts[currline] = anchor;
	  ends[currline] = new Point(x,y);
          currline++;
          currentpoint = null;
	  repaint();
    	}

      public void paint(Graphics g)
        {
	  // Draw existing lines
  	    for ( int i =0; i < currline; i++ )
             g.drawLine(starts[i].x, starts[i].y, ends[i].x, ends[i].y);
          // draw the current line
            g.setColor(Color.red);
            if (currentpoint != null ) 
             g.drawLine(anchor.x, anchor.y, 
                        currentpoint.x, currentpoint.y);


        } // end of paint


      } // end of class Lines...