// Exercise 5.11 Solution: Graphs.java
// Program prints 5 histograms with lengths determined by user.

// Java core packages
import java.awt.Graphics;

// Java extension packages
import javax.swing.*;

public class Graphs extends JApplet {
   int number1, number2, number3, number4, number5;

   // initialize applet by obtaining values from user
   public void init()
   {
      String inputString;
      int inputNumber, counter = 1;

      while ( counter <= 5) {
         inputString = JOptionPane.showInputDialog( "Enter number:" );
         inputNumber = Integer.parseInt( inputString );

         // define appropriate num if input is between 1-30
         if ( inputNumber >= 1 && inputNumber <= 30 ) {

            switch ( counter ) {

               case 1:
                  number1 = inputNumber;
                  break;   // done processing case

               case 2:
                  number2 = inputNumber;
                  break;   // done processing case

               case 3:
                  number3 = inputNumber;
                  break;   // done processing case

               case 4:
                  number4 = inputNumber;
                  break;   // done processing case

               case 5:
                  number5 = inputNumber;
                  break;   // done processing case
            }

            counter++;

         }  // end if

         else
            JOptionPane.showMessageDialog( null,
               "Invalid Input\nNumber should be between 1 and 30",
               "Error", JOptionPane.ERROR_MESSAGE );

      }  // end while

   }  // end method init

   // draw histograms on applet's background
   public void paint( Graphics g )
   {
      // call inherited version of method paint
      super.paint( g );

      int xCoordinate, yCoordinate = 0, value = 0;

      // print histograms
      for ( int counter = 1; counter <= 5; counter++ ) {

         switch ( counter ) {

            case 1:
               value = number1;
               break;   // done processing case

            case 2:
               value = number2;
               break;   // done processing case

            case 3:
               value = number3;
               break;   // done processing case

            case 4:
               value = number4;
               break;   // done processing case

            case 5:
               value = number5;
               break;   // done processing case
         }

         xCoordinate = 5;
         yCoordinate = counter * 10 + 40;

         for ( int j = 1; j <= value; j++ )
            g.drawString(
               "*", xCoordinate += 5, yCoordinate );
      }

   }  // end method paint

}  // end class Graphs