20     protected $internal = NULL;  variable in helper_plugin_odt_units
23         $this->internal = new ODTUnits();
86         $this->internal->setPixelPerEm ($value);
95         return $this->internal->getPixelPerEm ();
104         $this->internal->setTwipsPerPixelX ($value);
113         $this->internal->setTwipsPerPixelY ($value);
122         return $this->internal->getTwipsPerPixelX ();
131         return $this->internal->getTwipsPerPixelY();
141         return $this->internal->pixelToPointsX ($pixel);
151         return $this->internal->pixelToPointsY ($pixel);
163         return $this->internal->toPoints ($value, $axis);
167         return $this->internal;