QWT::Knob with the logarithmic scale

[hack006]

Hi, I am trying to set up logarithmic scale for a Knob, but the following code isn't working. Knob's scale keeps the same values - nothing changes after execution of this code. I would like to have these values: 0.01, 0.02, 0.05, 0,1 0,2 .. 1
void JOP::scopeGetInicialized(){
double min, max, step;
min = 1.0;
max = 4.0;
step = 1.0;

QwtLog10ScaleEngine * log10SE = new QwtLog10ScaleEngine();
log10SE->divideScale(0.001,0.2,6,2,1);
ui->KnobTimeA->setScaleEngine(log10SE);
ui->KnobTimeA->repaint();

qDebug() << "Scale changed";
}

Thank's for help

[Uwe]

I would like to have these values: 0.01, 0.02, 0.05, 0,1 0,2 .. 1

knob->setScaleEngine( new QwtLog10ScaleEngine() );
knob->setRange(0.01, 1.0 );

knob->setScaleEngine( new QwtLog10ScaleEngine() );
knob->setRange(0.01, 1.0 );

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Uwe