<?php

/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */

/**
 * Image_Graph - PEAR PHP OO Graph Rendering Utility.
 *
 * PHP versions 4 and 5
 *
 * LICENSE: This library is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation; either version 2.1 of the License, or (at your
 * option) any later version. This library is distributed in the hope that it
 * will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty
 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
 * General Public License for more details. You should have received a copy of
 * the GNU Lesser General Public License along with this library; if not, write
 * to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
 * 02111-1307 USA
 *
 * @category   Images
 * @package    Image_Graph
 * @subpackage Marker
 * @author     Jesper Veggerby <pear.nosey@veggerby.dk>
 * @copyright  Copyright (C) 2003, 2004 Jesper Veggerby Hansen
 * @license    http://www.gnu.org/copyleft/lesser.html  LGPL License 2.1
 * @version    CVS: $Id: Marker.php,v 1.8 2005/02/21 20:49:47 nosey Exp $
 * @link       http://pear.php.net/package/Image_Graph
 */

/**
 * Include file Image/Graph/Plotarea/Element.php
 */
require_once 'Image/Graph/Plotarea/Element.php';

/**
 * Data point marker.
 *
 * The data point marker is used for marking the datapoints on a graph with some
 * visual label, fx. a cross, a text box with the value or an icon.
 *
 * @category   Images
 * @package    Image_Graph
 * @subpackage Marker
 * @author     Jesper Veggerby <pear.nosey@veggerby.dk>
 * @copyright  Copyright (C) 2003, 2004 Jesper Veggerby Hansen
 * @license    http://www.gnu.org/copyleft/lesser.html  LGPL License 2.1
 * @version    Release: 0.7.2
 * @link       http://pear.php.net/package/Image_Graph
 * @abstract
 */
class Image_Graph_Marker extends Image_Graph_Plotarea_Element
{

    /**
     * Secondary marker
     * @var Marker
     * @access private
     */
    var $_secondaryMarker = false;

    /**
     * Constructor
     */
    function Image_Graph_Marker() {
        parent::__construct();
    }

    /**
     * The 'size' of the marker, the meaning depends on the specific Marker
     * implementation
     * @var int
     * @access private
     */
    var $_size = 6;

    /**
     * Set the 'size' of the marker
     *
     * @param int $size The 'size' of the marker, the meaning depends on the
     *   specific Marker implementation
     */
    function setSize($size)
    {
        $this->_size = $size;
    }

    /**
     * Set the secondary marker
     *
     * @param Marker $secondaryMarker The secondary marker
     */
    function setSecondaryMarker(& $secondaryMarker)
    {
        $this->_secondaryMarker =& $secondaryMarker;
        $this->_secondaryMarker->_setParent($this);
    }

    /**
     * Draw the marker on the canvas
     *
     * @param int $x The X (horizontal) position (in pixels) of the marker on
     *   the canvas
     * @param int $y The Y (vertical) position (in pixels) of the marker on the
     *   canvas
     * @param array $values The values representing the data the marker 'points'
     *   to
     * @access private
     */
    function _drawMarker($x, $y, $values = false)
    {
        if (is_a($this->_secondaryMarker, 'Image_Graph_Marker')) {
            $this->_secondaryMarker->_drawMarker($x, $y, $values);
        }
    }

    /**
     * Output to the canvas
     *
     * @return bool Was the output 'good' (true) or 'bad' (false).
     * @access private
     */
    function _done()    
    {
        return true;
    }

}

?>