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Diffstat (limited to 'packages/dspam/pear/Image/Graph/DataSelector/EveryNthPoint.php')
| -rw-r--r-- | packages/dspam/pear/Image/Graph/DataSelector/EveryNthPoint.php | 97 |
1 files changed, 97 insertions, 0 deletions
diff --git a/packages/dspam/pear/Image/Graph/DataSelector/EveryNthPoint.php b/packages/dspam/pear/Image/Graph/DataSelector/EveryNthPoint.php new file mode 100644 index 00000000..62581222 --- /dev/null +++ b/packages/dspam/pear/Image/Graph/DataSelector/EveryNthPoint.php @@ -0,0 +1,97 @@ +<?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 DataSelector + * @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/DataSelector.php + */ +require_once 'Image/Graph/DataSelector.php'; + +/** + * Filter out all points except every Nth point. + * + * Use this dataselector if you have a large number of datapoints, but only want to + * show markers for a small number of them, say every 10th. + * + * @category Images + * @package Image_Graph + * @subpackage DataSelector + * @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_DataSelector_EveryNthPoint extends Image_Graph_DataSelector +{ + + /** + * The number of points checked + * @var int + * @access private + */ + var $_pointNum = 0; + + /** + * The number of points between every 'show', default: 10 + * @var int + * @access private + */ + var $_pointInterval = 10; + + /** + * EvertNthPoint [Constructor] + * + * @param int $pointInterval The number of points between every 'show', + * default: 10 + */ + function Image_Graph_DataSelector_EveryNthpoint($pointInterval = 10) + { + parent::Image_Graph_DataSelector(); + $this->_pointInterval = $pointInterval; + } + + /** + * Check if a specified value should be 'selected', ie shown as a marker + * + * @param array $values The values to check + * @return bool True if the Values should cause a marker to be shown, + * false if not + * @access private + */ + function _select($values) + { + $oldPointNum = $this->_pointNum; + $this->_pointNum++; + return (($oldPointNum % $this->_pointInterval) == 0); + } + +} + +?>
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