Problems with Dial/Compass and with logarithmic scale

[alu23]

Hello,

1) How can I change the font size on a Dial/Compass?
My widget is derived from QwtCompass and I want to change the font size of the labels.
How can I do that?

2) When I use the Log10Scale in a plot e. g. with a "stick" curve style, the sticks "hang down" from the ceiling instead of doing like expected.
I guess this is because there's no 0 on the y-axis with a logarithmic scale.
What can I do about it to use a logarithmic scale with sticks drawn "correctly"?

Thanks in advance

Alu

[Uwe]

1) How can I change the font size on a Dial/Compass?

compass->setFont(...);

2) When I use the Log10Scale in a plot e. g. with a "stick" curve style, the sticks "hang down" from the ceiling instead of doing like expected.
I guess this is because there's no 0 on the y-axis with a logarithmic scale.

You need to assign a baseline ( f.e QwtPlotCurve::setBaseline(1.0e-100) ) with a value, that is inside the range of a logarithmic calculation. Be careful, that the value is not too small compared to your axis scale to avoid integer overruns.

Uwe

[alu23]

Thank you!