/*==============================================================
 *	BASE_CONVERTER.java
 *		© 1999 Midnight Oil Music-All Rights Reserved
 *
 * 	Last Modified:
 *
 *		This program converts numbers from one base to another,
 *		e.g. decimal to binary, hex to decimal etc.
 *
 *=============================================================*/
 
import java.lang.*;
import java.awt.*;
import java.applet.Applet;
//import java.awt.event.*;

public class BaseConverterApplet extends Applet
{

	int    	    num;
	Font	    theFont;
	String 	    outStr;
	String 	    inStr;
	TextField   dataEntry;
	TextField   outputField;
	FontMetrics fMetrics;
	
	boolean fontsSet = false;
	
	public void init() 
	{
		this.setLayout( null );		// Don't use a layout manager

		Label l = new Label( "The Results" );
		l.reshape( 201, 90, 100, 20 );
		this.add( l );
	
	// Add a text field for the output	
		outputField = new TextField( "" );
		outputField.setEditable( false );		// You can't type in here
		outputField.reshape( 126, 110, 250, 20 );
		this.add( outputField );
		
		l = new Label( "Enter Number:" );
		l.reshape( 10, 160, 110, 20 ); 
		this.add( l );
	
	// Add a text field for data entry	 
		dataEntry = new TextField( 35 );
		dataEntry.reshape( 126, 160, 300, 20 );
		this.add( dataEntry );	
		dataEntry.requestFocus();		// Set cursor to blinking
		
		l = new Label( "Select Operation" );
		l.reshape( 201, 200, 110, 20 );
		this.add( l );

// Add the function buttons		
		Button b = new Button( "Decimal to Bin" );
		b.reshape( 12, 230, 110, 20 );
		this.add( b );

		b = new Button( "Bin to Decimal" );
		b.reshape( 134, 230, 110, 20 );
		this.add( b );

		b = new Button( "Decimal to Hex" );
		b.reshape( 256, 230, 110, 20 );
		this.add( b );

		b = new Button( "Hex to Decimal" );
		b.reshape( 378, 230, 110, 20 );
		this.add( b );
		
		//repaint();
		
	}	// end init()


/*------------------------------------------------------------------------
 *		setFonts
 *
 *-----------------------------------------------------------------------*/
	
	private void setFonts( Graphics g ) 
	{
		if ( fontsSet )
			return;
		
		theFont = new Font( "Times", Font.BOLD, 36 );
		fMetrics = g.getFontMetrics( theFont );
		fontsSet = true;			
		
	}	// end setFonts()	

	
/*------------------------------------------------------------------------
 *		paint
 *
 *-----------------------------------------------------------------------*/
	
	public void paint( Graphics g ) 
	{
		setFonts( g );
		
		String title = "Bob's Base Converter";
		
		int cx = 50;
		int cy = 50;
		
		g.setFont( theFont );
		g.drawString( title, cx, cy );
		
	}	


/*------------------------------------------------------------------------
 *		action	
 *	Respond to button clicks
 *-----------------------------------------------------------------------*/

	public boolean action( Event  evt,
						   Object arg )
	{
		if ( arg.equals( "Decimal to Bin" ) )
		{
			inStr = dataEntry.getText();	// Read the text field
		
		// Convert the text to a decimal integer
		// and then to a binary string. parseInt throws a 
		// NumberFormat Exception so this is in a try catch block	
			try
			{
				num = Integer.parseInt( inStr, 10 );
				if ( num >= Integer.MIN_VALUE && num <= Integer.MAX_VALUE )
					outStr = Integer.toBinaryString( num );
				else
					outStr = "Value out of range!";
			}
			catch( NumberFormatException e )	// If the number is not in the specified format
			{									// catch the exception
				outStr = "Invalid Entry!";
			}
			
			outputField.setText( "" );			// Clear the output text field
			outputField.setText( outStr );		// Show the results
			
			dataEntry.setText( "" );			// Clear the entry text field
			dataEntry.requestFocus();			// Set the cursor to flashing
		}
		else if ( arg.equals( "Bin to Decimal" ) )
		{
			inStr = dataEntry.getText();
			
			try
			{
				num = Integer.parseInt( inStr, 2 );
			
				if ( num >= Integer.MIN_VALUE && num <= Integer.MAX_VALUE )
					outStr = Integer.toString( num );
				else
					outStr = "Value out of range!";
			}
			catch( NumberFormatException e )
			{
				outStr = "Invalid Entry!";
			}
			
			outputField.setText( "" );
			outputField.setText( outStr );
			
			dataEntry.setText( "" );
			dataEntry.requestFocus();
		}
		else if ( arg.equals( "Decimal to Hex" ) )
		{
			inStr = dataEntry.getText();
			
			try
			{
				num = Integer.parseInt( inStr, 10 );
			
				if ( num >= Integer.MIN_VALUE && num <= Integer.MAX_VALUE )
					outStr = Integer.toHexString( num );
				else
					outStr = "Value out of range!";
			}
			catch( NumberFormatException e )
			{
				outStr = "Invalid Entry!";
			}
			
			outputField.setText( "" );
			outputField.setText( outStr );
			
			dataEntry.setText( "" );
			dataEntry.requestFocus();
		}
		else
		{
			inStr = dataEntry.getText();
			
			try
			{
				num = Integer.parseInt( inStr, 16 );
			
				if ( num >= Integer.MIN_VALUE && num <= Integer.MAX_VALUE )
					outStr = Integer.toString( num );
				else
					outStr = "Value out of range!";
			}
			catch( NumberFormatException e )
			{
				outStr = "Invalid Entry!";
			}
			
			outputField.setText( "" );
			outputField.setText( outStr );
			
			dataEntry.setText( "" );
			dataEntry.requestFocus();
		}
		
		return true;

	}	// end action()	

}	// end BaseConverterApplet class