<?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 Grid
 * @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: $Id$
 * @link       http://pear.php.net/package/Image_Graph
 */

/**
 * Include file Image/Graph/Grid.php
 */
require_once 'Image/Graph/Grid.php';

/**
 * Display a line grid on the plotarea.
 *
 * {@link Image_Graph_Grid}
 *
 * @category   Images
 * @package    Image_Graph
 * @subpackage Grid
 * @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: @package_version@
 * @link       http://pear.php.net/package/Image_Graph
 */
class Image_Graph_Grid_Lines extends Image_Graph_Grid
{

    /**
     * GridLines [Constructor]
     */
    function Image_Graph_Grid_Lines()
    {
        parent::Image_Graph_Grid();
        $this->_lineStyle = 'lightgrey';
    }

    /**
     * Output the grid
     *
     * @return bool Was the output 'good' (true) or 'bad' (false).
     * @access private
     */
    function _done()
    {
        if (parent::_done() === false) {
            return false;
        }

        if (!$this->_primaryAxis) {
            return false;
        }

        $this->_canvas->startGroup(get_class($this));
        
        $value = false;

        $secondaryPoints = $this->_getSecondaryAxisPoints();

        while (($value = $this->_primaryAxis->_getNextLabel($value)) !== false) {
            reset($secondaryPoints);
            list ($id, $previousSecondaryValue) = each($secondaryPoints);
            while (list ($id, $secondaryValue) = each($secondaryPoints)) {
                if ($this->_primaryAxis->_type == IMAGE_GRAPH_AXIS_Y) {
                    $p1 = array ('X' => $secondaryValue, 'Y' => $value);
                    $p2 = array ('X' => $previousSecondaryValue, 'Y' => $value);
                } else {
                    $p1 = array ('X' => $value, 'Y' => $secondaryValue);
                    $p2 = array ('X' => $value, 'Y' => $previousSecondaryValue);
                }

                $x1 = $this->_pointX($p1);
                $y1 = $this->_pointY($p1);
                $x2 = $this->_pointX($p2);
                $y2 = $this->_pointY($p2);

                $previousSecondaryValue = $secondaryValue;

                $this->_getLineStyle();
                $this->_canvas->line(array('x0' => $x1, 'y0' => $y1, 'x1' => $x2, 'y1' => $y2));
            }
        }
        
        $this->_canvas->endGroup();
        
        return true;
    }

}
?>