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+<?php
+
+/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */
+
+/**
+ * Image_Graph - Main class for the graph creation.
+ *
+ * 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
+ * @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
+ */
+
+if (!function_exists('is_a')) {
+
+ /**
+ * Check if an object is of a given class, this function is available as of PHP 4.2.0, so if it exist it will not be declared
+ *
+ * @link http://www.php.net/manual/en/function.is-a.php PHP.net Online Manual for function is_a()
+ * @param object $object The object to check class for
+ * @param string $class_name The name of the class to check the object for
+ * @return bool Returns TRUE if the object is of this class or has this class as one of its parents
+ */
+ function is_a($object, $class_name)
+ {
+ if (empty ($object)) {
+ return false;
+ }
+ $object = is_object($object) ? get_class($object) : $object;
+ if (strtolower($object) == strtolower($class_name)) {
+ return true;
+ }
+ return is_a(get_parent_class($object), $class_name);
+ }
+}
+
+/**
+ * Include file Image/Canvas.php
+ */
+require_once 'Image/Canvas.php';
+
+/**
+ * The ultimate ancestor of all Image_Graph classes.
+ *
+ * This class contains common functionality needed by all Image_Graph classes.
+ *
+ * @category Images
+ * @package Image_Graph
+ * @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
+ * @abstract
+ */
+class Image_Graph_Common
+{
+
+ /**
+ * The parent container of the current Image_Graph object
+ *
+ * @var Image_Graph_Common
+ * @access private
+ */
+ var $_parent = null;
+
+ /**
+ * The sub-elements of the current Image_Graph container object
+ *
+ * @var array
+ * @access private
+ */
+ var $_elements;
+
+ /**
+ * The canvas for output.
+ *
+ * Enables support for multiple output formats.
+ *
+ * @var Image_Canvas
+ * @access private
+ */
+ var $_canvas = null;
+
+ /**
+ * Is the object visible?
+ *
+ * @var bool
+ * @access private
+ */
+ var $_visible = true;
+
+ /**
+ * Constructor [Image_Graph_Common]
+ */
+ function Image_Graph_Common()
+ {
+ }
+
+ /**
+ * Resets the elements
+ *
+ * @access private
+ */
+ function _reset()
+ {
+ if (is_array($this->_elements)) {
+ $keys = array_keys($this->_elements);
+ foreach ($keys as $key) {
+ if (is_object($this->_elements[$key])) {
+ $this->_elements[$key]->_setParent($this);
+ $result =& $this->_elements[$key]->_reset();
+ if (PEAR::isError($result)) {
+ return $result;
+ }
+ }
+ }
+ unset($keys);
+ }
+ return true;
+ }
+
+ /**
+ * Sets the parent. The parent chain should ultimately be a GraPHP object
+ *
+ * @see Image_Graph_Common
+ * @param Image_Graph_Common $parent The parent
+ * @access private
+ */
+ function _setParent(& $parent)
+ {
+ $this->_parent =& $parent;
+ $this->_canvas =& $this->_parent->_getCanvas();
+
+ if (is_array($this->_elements)) {
+ $keys = array_keys($this->_elements);
+ foreach ($keys as $key) {
+ if (is_object($this->_elements[$key])) {
+ $this->_elements[$key]->_setParent($this);
+ }
+ }
+ unset($keys);
+ }
+ }
+
+ /**
+ * Hide the element
+ */
+ function hide()
+ {
+ $this->_visible = false;
+ }
+
+ /**
+ * Get the canvas
+ *
+ * @return Image_Canvas The canvas
+ * @access private
+ */
+ function &_getCanvas()
+ {
+ if (($this->_canvas !== null) || ($this->_canvas !== false)) {
+ return $this->_canvas;
+ } elseif (is_a($this->_parent, 'Image_Graph_Common')) {
+ $this->_canvas =& $this->_parent->_getCanvas();
+ return $this->_canvas;
+ } else {
+ $this->_error('Invalid canvas');
+ $result = null;
+ return $result;
+ }
+ }
+
+ /**
+ * Adds an element to the objects element list.
+ *
+ * The new Image_Graph_elements parent is automatically set.
+ *
+ * @param Image_Graph_Common $element The new Image_Graph_element
+ * @return Image_Graph_Common The new Image_Graph_element
+ */
+ function &add(& $element)
+ {
+ if (!is_a($element, 'Image_Graph_Font')) {
+ $this->_elements[] = &$element;
+ }
+ $element->_setParent($this);
+ return $element;
+ }
+
+ /**
+ * Creates an object from the class and adds it to the objects element list.
+ *
+ * Creates an object from the class specified and adds it to the objects
+ * element list. If only one parameter is required for the constructor of
+ * the class simply pass this parameter as the $params parameter, unless the
+ * parameter is an array or a reference to a value, in that case you must
+ * 'enclose' the parameter in an array. Similar if the constructor takes
+ * more than one parameter specify the parameters in an array.
+ *
+ * @see Image_Graph::factory()
+ * @param string $class The class for the object
+ * @param mixed $params The paramaters to pass to the constructor
+ * @return Image_Graph_Common The new Image_Graph_element
+ */
+ function &addNew($class, $params = null, $additional = false)
+ {
+ include_once 'Image/Graph.php';
+ $element =& Image_Graph::factory($class, $params);
+ if ($additional === false) {
+ $obj =& $this->add($element);
+ } else {
+ $obj =& $this->add($element, $additional);
+ }
+ return $obj;
+ }
+
+ /**
+ * Shows an error message box on the canvas
+ *
+ * @param string $text The error text
+ * @param array $params An array containing error specific details
+ * @param int $error_code Error code
+ * @access private
+ */
+ function _error($text, $params = false, $error_code = IMAGE_GRAPH_ERROR_GENERIC)
+ {
+ if ((is_array($params)) && (count($params) > 0)) {
+ foreach ($params as $name => $key) {
+ if (isset($parameters)) {
+ $parameters .= ' ';
+ }
+ else {
+ $parameters = '';
+ }
+ $parameters .= $name . '=' . $key;
+ }
+ }
+ $error =& PEAR::raiseError(
+ $text .
+ ($error_code != IMAGE_GRAPH_ERROR_GENERIC ? ' error:' . IMAGE_GRAPH_ERROR_GENERIC : '') .
+ (isset($parameters) ? ' parameters:[' . $parameters . ']' : '')
+ );
+ }
+
+ /**
+ * Causes the object to update all sub elements coordinates
+ *
+ * (Image_Graph_Common, does not itself have coordinates, this is basically
+ * an abstract method)
+ *
+ * @access private
+ */
+ function _updateCoords()
+ {
+ if (is_array($this->_elements)) {
+ $keys = array_keys($this->_elements);
+ foreach ($keys as $key) {
+ if (is_object($this->_elements[$key])) {
+ $this->_elements[$key]->_updateCoords();
+ }
+ }
+ unset($keys);
+ }
+ return true;
+ }
+
+ /**
+ * Causes output to canvas
+ *
+ * The last method to call. Calling Done causes output to the canvas. All
+ * sub elements done() method will be invoked
+ *
+ * @return bool Was the output 'good' (true) or 'bad' (false).
+ * @access private
+ */
+ function _done()
+ {
+ if (($this->_canvas == null) || (!is_a($this->_canvas, 'Image_Canvas'))) {
+ return false;
+ }
+
+ if (is_array($this->_elements)) {
+ $keys = array_keys($this->_elements);
+ foreach ($keys as $key) {
+ if (($this->_elements[$key]->_visible) && ($this->_elements[$key]->_done() === false)) {
+ return false;
+ }
+ }
+ unset($keys);
+ }
+ return true;
+ }
+
+}
+
+?> \ No newline at end of file
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