v /= zoomFactor;
v *= zoomFactor;
    double getUnitBarSize()    {         double v = unitInMicrons;        if (getPixelsSizeX() > 0) v = unitInMicrons/getPixelsSizeX();        v /= zoomFactor;        return v;       //if (unit == -1) setUnitBarSize(5);        //return unit;     }