/**
  * We need an instance of the LineGraph class
  */
 public function __construct($w, $h, $settings = NULL)
 {
     parent::__construct($w, $h, $settings);
     // prevent repeated labels
     unset($settings['label']);
     $this->linegraph = new LineGraph($w, $h, $settings);
 }
 /**
  * We need an instance of the LineGraph class
  */
 public function __construct($w, $h, $settings = NULL)
 {
     parent::__construct($w, $h, $settings);
     $this->linegraph = new LineGraph($w, $h, $settings);
 }