<?php
/*
 * This work is hereby released into the Public Domain.
 * To view a copy of the public domain dedication,
 * visit http://creativecommons.org/licenses/publicdomain/ or send a letter to
 * Creative Commons, 559 Nathan Abbott Way, Stanford, California 94305, USA.
 *
 */
 
require_once dirname(__FILE__)."/../Graph.class.php";

/**
 * Objects capable of being positioned
 *
 * @package Artichow
 */
interface awPositionable {

	/**
	 * Left align
	 *
	 * @var int
	 */
	const LEFT = 1;

	/**
	 * Right align
	 *
	 * @var int
	 */
	const RIGHT = 2;

	/**
	 * Center align
	 *
	 * @var int
	 */
	const CENTER = 3;

	/**
	 * Top align
	 *
	 * @var int
	 */
	const TOP = 4;

	/**
	 * Bottom align
	 *
	 * @var int
	 */
	const BOTTOM = 5;

	/**
	 * Middle align
	 *
	 * @var int
	 */
	const MIDDLE = 6;
	
	/**
	 * Change alignment
	 *
	 * @param int $h Horizontal alignment
	 * @param int $v Vertical alignment
	 */
	public function setAlign($h = NULL, $v = NULL);
	
}

registerInterface('Positionable');

/**
 * Manage left, right, top and bottom sides
 *
 * @package Artichow
 */
class awSide {

	/**
	 * Left side
	 *
	 * @var int
	 */
	public $left = 0;

	/**
	 * Right side
	 *
	 * @var int
	 */
	public $right = 0;

	/**
	 * Top side
	 *
	 * @var int
	 */
	public $top = 0;

	/**
	 * Bottom side
	 *
	 * @var int
	 */
	public $bottom = 0;
	
	/**
	 * Build the side
	 *
	 * @param mixed $left
	 * @param mixed $right
	 * @param mixed $top
	 * @param mixed $bottom
	 */
	public function __construct($left = NULL, $right = NULL, $top = NULL, $bottom = NULL) {
		$this->set($left, $right, $top, $bottom);
	}
	
	
	/**
	 * Change side values
	 *
	 * @param mixed $left
	 * @param mixed $right
	 * @param mixed $top
	 * @param mixed $bottom
	 */
	public function set($left = NULL, $right = NULL, $top = NULL, $bottom = NULL) {
	
		if ($left !== NULL) {
			$this->left = (float)$left;
		}
		if ($right !== NULL) {
			$this->right = (float)$right;
		}
		if ($top !== NULL) {
			$this->top = (float)$top;
		}
		if ($bottom !== NULL) {
			$this->bottom = (float)$bottom;
		}
		
	}
	
	
	/**
	 * Add values to each side
	 *
	 * @param mixed $left
	 * @param mixed $right
	 * @param mixed $top
	 * @param mixed $bottom
	 */
	public function add($left = NULL, $right = NULL, $top = NULL, $bottom = NULL) {
	
		if ($left !== NULL) {
			$this->left += (float)$left;
		}
		if ($right !== NULL) {
			$this->right += (float)$right;
		}
		if ($top !== NULL) {
			$this->top += (float)$top;
		}
		if ($bottom !== NULL) {
			$this->bottom += (float)$bottom;
		}
		
	}

}

registerClass('Side');