Initial Commit of AgileBill Open Source

includes/pear/Image/Graph/Axis/Logarithmic.php

@@ -0,0 +1,175 @@
+<?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: Logarithmic.php,v 1.13 2005/09/25 17:52:17 nosey Exp $
+ * @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);
+    }
+
+    /**
+     * 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;
+    }
+
+    /**
+     * Forces the minimum value of the axis.
+     *
+     * For an logarithimc axis this is always 0
+     *
+     * @param double $minimum The minumum value to use on the axis
+     */
+    function forceMinimum($minimum)
+    {
+        parent::forceMinimum(0);
+    }
+
+    /**
+     * Gets the minimum value the axis will show.
+     *
+     * For an logarithimc axis this is always 0
+     *
+     * @return double The minumum value
+     * @access private
+     */
+    function _getMinimum()
+    {
+        return 0;
+    }
+
+    /**
+     * 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);
+    }
+
+    /**
+     * 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 1;
+    }
+
+    /**
+     * 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);
+    }
+    
+}
+
+?>