Exemplo n.º 1
0
 /**
  * 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;
     }
 }