how to get painter for QwtScaleDraw function?

[josentop]

I derived a class from QwtScaleDraw and add a function to draw the scale in real time, but the function can't use QPainter *painter to draw the scale due to it only can be used with paintevent. how can i draw the scale same as QwtPlot's QwtPlotDriectPainter method in real time? thanks.

[Uwe]

Read the code of QwtPlotDirectPainter and do the same in your code,

Uwe