import java.applet.*;
   import java.awt.*;

   public class ps4e2a extends Applet implements Runnable
   {
	 
	   Thread animator = null;
	   Button btn1 = new Button("expand");
	   Button btn2 = new Button("revert");
	   Label lab1 = new Label("enter characters to add: ");
	   TextField tf1 = new TextField(10);
	   String message = "teststring";
	   String str1 = "randomness";
	   String str2,str3;
	   String strx;
	   Image bufimage;
	   Font font1;
	   boolean expand,revert,lastone,prevstate;
	   int str1w,str1h,str1d,str1a,str2w,str2h,str2d,str2a,str3w,str3h,str3d,str3a;
	   int x1,x2,x3,y1,y2,y3,s1x,s2x,s3x,s1y,s2y,s3y,d1x,d1y,d2x,d2y,d3x,d3y;
	   int state[] = new int[500];
       int x = 10;
	   int y = 40;
	   int cstate = 1;
	   int split,splitx,splity;



	   public void init ()
	   {
		   add(lab1);
		   add(tf1);
		   add(btn1);
		   add(btn2);
		   lastone = true;

		   font1 = new Font("Serif",Font.PLAIN, 30);
		   animator = new Thread();

		   for (int i = 0; i < str1.length();i++)
			   state[i] = 1;
		   x1 = 180;
		   y1 = 200;
		   y3 = 200;

		   s1x = 180;
		   s1y = 200;
		   s2y = 200;
           s3y = 200;

		   System.out.println("starting Bill's java appet");


		 

	   }

	   
 
	  
       public boolean action( Event e, Object o )
	   {   
		 if (e.target == btn1 & tf1.getText().length() != 0)
		 {
			expand = true;
			strx = tf1.getText();
			animator = new Thread(this);
		    animator.start();
					
		 }
		 if (e.target == btn2)
			 if(cstate > 1)
		 {
			{
				revert = true;
				animator = new Thread(this);
				animator.start();
		  // 	cstate = cstate--;
			}
		 }

		 
		   return true;
	   }

	   public void paint(Graphics g)
	   {
		   g.setColor(Color.white);
		   g.fillRect(0,30,540,200);
		   g.setColor(Color.black);
    	   g.setFont(font1);
		   g.drawString(str1,x1,y1);
			if (lastone == false)
			{
		      g.drawString(str2,x2,y2);
			  g.drawString(str3,x3,y3);
			}
	   }


	   public void run()
	   {
		  
		   int oldx,oldy;
		   FontMetrics fm1 = this.getFontMetrics(font1);
		   str1h = fm1.getHeight();
		   str1w = fm1.stringWidth(str1);
		   str1d = fm1.getDescent();
		   str1a = fm1.getAscent();

		   if (expand == true)
		   {
			   System.out.println("x loop: " + strx);
			   System.out.println("str1: " + str1);


			   cstate++;
			   lastone = false;
			   	System.out.println(" ");
			   for (int i = 0;i < strx.length();i++)
			   {
					split = (int)(Math.random() * str1.length());
					for ( int j = str1.length(); j > split; j--)
						state[j] = state[j-1];
					state[split] = cstate;
				
					str3 = str1.substring(split,str1.length());
					
					str2 = strx.substring(i,i+1);
					str1 = str1.substring(0,split);
					x1 = s1x;
					x3 = s1x + 	fm1.stringWidth(str1);
					y1 = s1y;
					y2 = 50;
					y3 = s1y;
					s1x = s1x - (fm1.stringWidth(str2)/2);
					s2x = s1x + fm1.stringWidth(str1);
					x2 = s1x + fm1.stringWidth(str1);
					s3x = s1x + fm1.stringWidth(str1) + fm1.stringWidth(str2);
					s2y = 200;

					while (y2 != s2y)
	//				while (x1 != s1x)
			

					{
		
	//				  	Dimension d = this.size();
	//					bufimage = this.createImage(d.width,d.height);


	//
						if (x1 != s1x)
						x1--;  

	//					if (x2 != s2x & x2 < s2x)
	//					x2 = x2+2;
	//					else 
	//				    x2 = x2 -2;

						if (x3 != s3x)
						x3++;  

						if (y1 != s1y)
						y1++;  

						if (y2 != s2y)
						y2 = y2 +6;
						if (y2 == s2y)
						{
							lastone = true;
							str1 = str1.concat(str2);
							str1 = str1.concat(str3);
							
						}

						if (y3 != s3y)
						y3++; 
						
						Graphics g=getGraphics();
//						Graphics g=bufimage.getGraphics();
				

						paint(g);
//						 g = this.getGraphics();
//						 g.drawImage(bufimage,0,0,this);
						lastone = false;
						try Thread.sleep(50); catch (InterruptedException e);

					}
			   }

		   expand = false;
		   }

		   if (revert == true)
		   {
			   prevstate = true;
			   lastone = false;
			   while (prevstate == true)
			   {
				 
				   int k = 0;
				   while(state[k] != cstate & k < str1.length())k++;

				   if (k == str1.length() &  state[k] != cstate)
				//	    if (k == str1.length())
				   {
						cstate = cstate -1;
						prevstate = false;
				   }
				   else
				   {
					 
					str3 = str1.substring(k+1,str1.length());
					str2 = str1.substring(k,k+1);
					str1 = str1.substring(0,k);
					x1 = s1x;
					x3 = s1x + 	fm1.stringWidth(str1)+fm1.stringWidth(str2);
					y1 = s1y;
					y2 = s1y;
					y3 = s1y;
					s1x = s1x + (fm1.stringWidth(str2)/2);
					s2x = s1x + fm1.stringWidth(str1);
					x2 = s1x + fm1.stringWidth(str1);
					s3x = s1x + fm1.stringWidth(str1);
					s2y = 50;
					for ( int j = str1.length(); j > split; j--)
						state[j] = state[j-1];

					while (y2 > 50)
					{
	//				  	Dimension d = this.size();
	//					bufimage = this.createImage(d.width,d.height);


	//
						if (x1 != s1x)
						x1++;  

	//					if (x2 != s2x & x2 < s2x)
	//					x2 = x2+2;
	//					else 
	//				    x2 = x2 -2;

						if (x3 != s3x)
						x3--;  

						if (y1 != s1y)
						y1++;  

						if (y2 != s2y)
						y2 = y2 -6;
						if (y2 == s2y)
						{
							lastone = true;;
							str1 = str1.concat(str3);
							for ( int m = k; m < str1.length(); m++)
						    state[m] = state[m+1];

							
						}

						if (y3 != s3y)
						y3--; 
						
						Graphics g=getGraphics();
//						Graphics g=bufimage.getGraphics();
				

						paint(g);
//						 g = this.getGraphics();
//						 g.drawImage(bufimage,0,0,this);
						lastone = false;
						try Thread.sleep(50); catch (InterruptedException e);

					}
				   }
			   }

		   revert = false;
		   }

	   }


   }