/**
* Gets an identification text
* @return string A textual identification of the object
* @access private
*/
function _identification()
{
return parent::_identification()." ($this->_left, $this->_top, $this->_right, $this->_bottom)";
}
/**
* 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)
{
$this->_debug("Adding element \"".$element->_identification());
$this->_elements[] = &$element;
$element->_setParent($this);
return $element;
}