Unit conversion in QwtPlot

[nichevo]

I'm plotting the time evolution of some system in a QwtPlot and would like to be able to easily
change to labels of the time axis between hours, days and years.

In the thermo widget one can get this conversion through the setRange() and setScale() functions, I'm wondering if QwtPlot has something analogous.

[Uwe]

All Qwt widgets with scales use the same classes to calculate and render them. So you can do the same with the scales of a QwtPlot and of a QwtThermo. See all methods starting with QwtPlot::setAxisScale....

Unfortunately Qwt doesn't have a date/time scale engine, that calculates ticks according to minutes/hours or weeks/months. Its on my TODO list for years so I would be glad for a contribution: "simply" derive from QwtScaleEngine and implement divideScale/autoScale.

Without having such a time/date scale engine you have calculate your ticks manually and use QwtPlot::setAxisScaleDiv or you have to live with scales aligned to decades.

Uwe