/*********************************************

	Copyright © 2001 Jason Lamport.
	All rights reserved.

----------------------

J_DigitalDisplay  
creates a digital readout

*******************************************/

package com.strangelight.v4control;

import com.strangelight.*;
import com.strangelight.salsa.*;

import java.awt.*;

public class J_DigitalDisplay extends Canvas {

	public static final int	BLUE_ON_BLACK_8x13	= 0;
	
	private static final String[] base_uris = {
		"/images/digits/blue_8x13_"
	};
	private static final int BLANK_SPACE = 10;	
	private static final int MINUS_SIGN = 11;	
	//	indexes of non-digit character images
	
	public J_DigitalDisplay(int digits, int style ) {
		
		value = null;
		digit_images = new J_Image[] {
			new J_Image(base_uris[style] + "0.JPG"),
			new J_Image(base_uris[style] + "1.JPG"),
			new J_Image(base_uris[style] + "2.JPG"),
			new J_Image(base_uris[style] + "3.JPG"),
			new J_Image(base_uris[style] + "4.JPG"),
			new J_Image(base_uris[style] + "5.JPG"),
			new J_Image(base_uris[style] + "6.JPG"),
			new J_Image(base_uris[style] + "7.JPG"),
			new J_Image(base_uris[style] + "8.JPG"),
			new J_Image(base_uris[style] + "9.JPG"),
			new J_Image(base_uris[style] + "_.JPG"),
			new J_Image(base_uris[style] + "-.JPG"),
		};
		digit_width = digit_images[0].get_image().getWidth(null);
		digit_height = digit_images[0].get_image().getHeight(null);
		value = null;
		num_digits = digits;
		this.setSize(digit_width * num_digits, digit_height);
	}
	
	public Integer get_value() {
		return value;
	}
	
	public void set_value(int new_value) {
		set_value( new Integer(new_value) );
	}
	
	public void set_value(Integer new_value) {
		value = new_value;
		Graphics g = this.getGraphics();
		if ( g != null ) {
			this.paint(g);
		}
	}
	
	public void paint(Graphics g) {
		int x, y, cur_digit;
		Integer temp_value = 
			( value == null )
			?	null
			:	new Integer( Math.abs(value.intValue()) );
		;
		
		cur_digit = BLANK_SPACE;
		y=0;
		for ( int i = (num_digits - 1) ; i >= 0; i-- ) {
			x = i * digit_width;
			if ( temp_value != null ) {	
				cur_digit = temp_value.intValue() % 10;
			}
			g.drawImage( digit_images[cur_digit].get_image(), x, y, null );
			if ( temp_value == null ) {
				cur_digit = BLANK_SPACE;
			} else {
				temp_value = new Integer( temp_value.intValue()/10 );
				if ( temp_value.intValue() == 0 ) {
					cur_digit =
						( value.intValue() < 0 )
						?	MINUS_SIGN
						:	BLANK_SPACE
					;
					temp_value = null;
				}				
			}
		}
		if ( cur_digit != BLANK_SPACE ) throw new E_OutOfBounds(
			value + " has more than " + num_digits + " digits/characters"
		);
	}

	public Dimension getPreferredSize() {
		return getSize();
	}
	
	public Dimension getMaximumSize() {
		return getSize();
	}
	
	public Dimension getMinimumSize() {
		return getSize();
	}
		
	private int digit_width, digit_height, num_digits;
	private Integer value;
	private J_Image[] digit_images;
	
}