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+<?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);
+ }
+
+}
+
+?> \ No newline at end of file