fae6352bf2
Removed PHP_Compat, and references to it. Removed ionCube/Zend/mmCache compatibility checks in test.php script. Changed minimum PHP requirement to 5.0 in test.php script.
152 lines
5.0 KiB
PHP
152 lines
5.0 KiB
PHP
<?php
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/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */
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/**
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* Class for axis handling.
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*
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* PHP versions 4 and 5
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*
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* LICENSE: This library is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; either version 2.1 of the License, or (at your
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* option) any later version. This library is distributed in the hope that it
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* will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty
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* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
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* General Public License for more details. You should have received a copy of
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* the GNU Lesser General Public License along with this library; if not, write
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* to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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* 02111-1307 USA
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*
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* @category Images
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* @package Image_Graph
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* @subpackage Axis
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* @author Jesper Veggerby <pear.nosey@veggerby.dk>
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* @copyright Copyright (C) 2003, 2004 Jesper Veggerby Hansen
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* @license http://www.gnu.org/copyleft/lesser.html LGPL License 2.1
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* @version CVS: $Id: Logarithmic.php,v 1.15 2006/03/02 12:35:57 nosey Exp $
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* @link http://pear.php.net/package/Image_Graph
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*/
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/**
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* Include file Image/Graph/Axis.php
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*/
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require_once 'Image/Graph/Axis.php';
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/**
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* Diplays a logarithmic axis (either X- or Y-axis).
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*
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* @category Images
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* @package Image_Graph
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* @subpackage Axis
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* @author Jesper Veggerby <pear.nosey@veggerby.dk>
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* @copyright Copyright (C) 2003, 2004 Jesper Veggerby Hansen
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* @license http://www.gnu.org/copyleft/lesser.html LGPL License 2.1
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* @version Release: @package_version@
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* @link http://pear.php.net/package/Image_Graph
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*/
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class Image_Graph_Axis_Logarithmic extends Image_Graph_Axis
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{
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/**
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* Image_Graph_AxisLogarithmic [Constructor].
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*
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* Normally a manual creation should not be necessary, axis are
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* created automatically by the {@link Image_Graph_Plotarea} constructor
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* unless explicitly defined otherwise
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*
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* @param int $type The type (direction) of the Axis, use IMAGE_GRAPH_AXIS_X
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* for an X-axis (default, may be omitted) and IMAGE_GRAPH_AXIS_Y for Y-
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* axis)
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*/
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function Image_Graph_Axis_Logarithmic($type = IMAGE_GRAPH_AXIS_X)
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{
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parent::Image_Graph_Axis($type);
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$this->showLabel(IMAGE_GRAPH_LABEL_MINIMUM + IMAGE_GRAPH_LABEL_MAXIMUM);
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$this->_minimum = 1;
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$this->_minimumSet = true;
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}
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/**
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* Calculate the label interval
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*
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* If explicitly defined this will be calucated to an approximate best.
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*
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* @return double The label interval
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* @access private
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*/
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function _calcLabelInterval()
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{
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$result = parent::_calcLabelInterval();
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$this->_axisValueSpan = $this->_value($this->_axisSpan);
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return $result;
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}
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/**
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* Preprocessor for values, ie for using logarithmic axis
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*
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* @param double $value The value to preprocess
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* @return double The preprocessed value
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* @access private
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*/
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function _value($value)
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{
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return log10($value) - log10($this->_minimum);
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}
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/**
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* Get next label point
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*
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* @param doubt $point The current point, if omitted or false, the first is
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* returned
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* @return double The next label point
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* @access private
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*/
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function _getNextLabel($currentLabel = false, $level = 1)
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{
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if (is_array($this->_labelOptions[$level]['interval'])) {
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return parent::_getNextLabel($currentLabel, $level);
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}
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if ($currentLabel !== false) {
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$value = log10($currentLabel);
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$base = floor($value);
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$frac = $value - $base;
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for ($i = 2; $i < 10; $i++) {
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if ($frac <= (log10($i)-0.01)) {
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$label = pow(10, $base)*$i;
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if ($label > $this->_getMaximum()) {
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return false;
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} else {
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return $label;
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}
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}
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}
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return pow(10, $base+1);
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}
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return max(1, $this->_minimum);
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}
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/**
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* Get the axis intersection pixel position
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*
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* This is only to be called prior to output! I.e. between the user
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* invokation of Image_Graph::done() and any actual output is performed.
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* This is because it can change the axis range.
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*
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* @param double $value the intersection value to get the pixel-point for
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* @return double The pixel position along the axis
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* @access private
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*/
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function _intersectPoint($value)
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{
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if (($value <= 0) && ($value !== 'max') && ($value !== 'min')) {
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$value = 1;
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}
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return parent::_intersectPoint($value);
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}
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}
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?>
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