/**
  * @param Stem $stemOne
  * @param Stem $stemTwo
  */
 protected function drawComparison(Stem $stemOne, Stem $stemTwo, HeadTube $headTube)
 {
     $comparison = $stemOne->compare($stemTwo, $headTube);
     $line = 1;
     $color = imagecolorallocate($this->image, 255, 255, 255);
     foreach ($comparison as $text) {
         imagettftext($this->image, 12, 0, 5, $line * 20, $color, $this->fontPath, $text);
         $line++;
     }
 }