Refreshing a Custom QwtScaleDraw

[Uwe]

TimeScaleDraw* scaleDraw = dynamic_cast<TimeScaleDraw*>( plot->axisScaleDraw( ... ) );
scaleDraw->start();
scaleDraw->invalidateCache();
plot->replot();

TimeScaleDraw* scaleDraw = dynamic_cast<TimeScaleDraw*>( plot->axisScaleDraw( ... ) );
scaleDraw->start();
scaleDraw->invalidateCache();
plot->replot();

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HTH,
Uwe

[grantbj74]

The scaleDraw->invalidateCache() gives a protected error when compiling.

If I put invalidateCache() inside a new function that changes appearance in TimeScaleDraw class: eg ms, sec, clock etc it changes straight away.

However if invalidateCache() is put in the end of start() time still doesn't update until the plot starts moving etc. I guess this isn't too much of an issue.

I just use the following for time atm:

QwtText TimeScaleDraw::label(double /*v*/) const
{
    return m_base_time.toString("H:mm:ss.zzz");
}

QwtText TimeScaleDraw::label(double /*v*/) const
{
    return m_base_time.toString("H:mm:ss.zzz");
}

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[d_stranz]

The call to invalidateCache() won't cause a replot on its own, it is just a method to ensure that the labels are recalculated the next time there -is- a replot. So after you construct your TimeScaleDraw class, call replot() from where ever you are in the code.

[grantbj74]

Yeah I was calling replot() last but made no difference.