package org.quiz;

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

public class QuizApplet extends Applet {
    public static final Color DEFAULT_BACKGROUND = Color.white;
    public void init() {
        super.init();
        setBackground(getBackgroundColor(DEFAULT_BACKGROUND));
    }
    protected Color getBackgroundColor(Color defaultColor) {
        Color c = defaultColor;
        String stringColor = getParameter("background");
        if (stringColor != null) {
            if (stringColor.startsWith("#") && stringColor.length() > 1) {
                try {
                    c = new Color(Integer.parseInt(stringColor.substring(1), 16));
                }
                catch(NumberFormatException e) {
                }
            }
        }
        return c;
    }


    // This is a helper class, to extract the integer
    // in the input. 
    // The assumption is that integer value
    // is followed by non digits, in some cases ('X').
    // So it supposed to read the integer, and ignore 
    // the rest.
    public String getInt(String s){
	String r= "";
	int i = 0;
	int l = s.length();
	char c;
	if (s == null || s.length() == 0 ) return "";
	while (s.charAt(i) == ' ')
	    i++;
	if (s.charAt(i) == '-' ){
	    r = r+s.charAt(i);
	    i++;
	}
	if (s.charAt(i) == '+')
	    i++;
	while (i < l){
	    c = s.charAt(i);
	    if (Character.isDigit(c)){
		r = r+c;
	    }
	    else
		break;
	    i++;
	}
	return r;
    }
    
}