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Diffstat (limited to 'packages/dspam/pear/Image/Graph/Axis/Logarithmic.php')
| -rw-r--r-- | packages/dspam/pear/Image/Graph/Axis/Logarithmic.php | 152 |
1 files changed, 152 insertions, 0 deletions
diff --git a/packages/dspam/pear/Image/Graph/Axis/Logarithmic.php b/packages/dspam/pear/Image/Graph/Axis/Logarithmic.php new file mode 100644 index 00000000..2675ee4c --- /dev/null +++ b/packages/dspam/pear/Image/Graph/Axis/Logarithmic.php @@ -0,0 +1,152 @@ +<?php + +/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */ + +/** + * Class for axis handling. + * + * 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 Axis + * @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/Axis.php + */ +require_once 'Image/Graph/Axis.php'; + +/** + * Diplays a logarithmic axis (either X- or Y-axis). + * + * @category Images + * @package Image_Graph + * @subpackage Axis + * @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_Axis_Logarithmic extends Image_Graph_Axis +{ + + /** + * Image_Graph_AxisLogarithmic [Constructor]. + * + * Normally a manual creation should not be necessary, axis are + * created automatically by the {@link Image_Graph_Plotarea} constructor + * unless explicitly defined otherwise + * + * @param int $type The type (direction) of the Axis, use IMAGE_GRAPH_AXIS_X + * for an X-axis (default, may be omitted) and IMAGE_GRAPH_AXIS_Y for Y- + * axis) + */ + function Image_Graph_Axis_Logarithmic($type = IMAGE_GRAPH_AXIS_X) + { + parent::Image_Graph_Axis($type); + $this->showLabel(IMAGE_GRAPH_LABEL_MINIMUM + IMAGE_GRAPH_LABEL_MAXIMUM); + $this->_minimum = 1; + $this->_minimumSet = true; + } + + /** + * Calculate the label interval + * + * If explicitly defined this will be calucated to an approximate best. + * + * @return double The label interval + * @access private + */ + function _calcLabelInterval() + { + $result = parent::_calcLabelInterval(); + $this->_axisValueSpan = $this->_value($this->_axisSpan); + return $result; + } + + /** + * Preprocessor for values, ie for using logarithmic axis + * + * @param double $value The value to preprocess + * @return double The preprocessed value + * @access private + */ + function _value($value) + { + return log10($value) - log10($this->_minimum); + } + + /** + * Get next label point + * + * @param doubt $point The current point, if omitted or false, the first is + * returned + * @return double The next label point + * @access private + */ + function _getNextLabel($currentLabel = false, $level = 1) + { + if (is_array($this->_labelOptions[$level]['interval'])) { + return parent::_getNextLabel($currentLabel, $level); + } + + if ($currentLabel !== false) { + $value = log10($currentLabel); + $base = floor($value); + $frac = $value - $base; + for ($i = 2; $i < 10; $i++) { + if ($frac <= (log10($i)-0.01)) { + $label = pow(10, $base)*$i; + if ($label > $this->_getMaximum()) { + return false; + } else { + return $label; + } + } + } + return pow(10, $base+1); + } + + return max(1, $this->_minimum); + } + + /** + * Get the axis intersection pixel position + * + * This is only to be called prior to output! I.e. between the user + * invokation of Image_Graph::done() and any actual output is performed. + * This is because it can change the axis range. + * + * @param double $value the intersection value to get the pixel-point for + * @return double The pixel position along the axis + * @access private + */ + function _intersectPoint($value) + { + if (($value <= 0) && ($value !== 'max') && ($value !== 'min')) { + $value = 1; + } + return parent::_intersectPoint($value); + } + +} + +?>
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