On 28 June 2016 at 07:55, Thompson, Adam B. <thompso...@ornl.gov> wrote: > > The software package I co-develop at work is dependent on Qt 4.8, but we plan > to move to Qt 5 > when we have time/funding. We currently depend on a third-party plotting > package for our 2D data > visualization, but we'd like to be able to use QtCharts when we upgrade. > > > > Some of our data sets are time-dependent and are often extrapolated hundreds > or thousands of > years in the future. As such, a logarithmic time scale would be quite useful, > if not necessary to view > the data in a truly meaningful manner.
Why not use a plain QLogValueAxis for your X axis, if you're talking thousand of years, i guess you don't need month, day, hours, minutes, ... on your X axis, do you? Do you need to take into account leap year, leap seconds? Is there a mathematical definition of log(date:time) QLogValueAxis with just years should do the job. But maybe i'm missing something. Looking at the source in qt5/qtcharts/src/charts/axis/datetimeaxis and qt5/qtcharts/src/charts/axis/logvalueaxis doesn't show complicated code. So this seems to be doable "easily". My 2cents, Chris > > > Can anyone provide guidance on properly extending QDateTimeAxis (, > QLogValueAxis, or QAbstractAxis) to provide a logarithmic time scale as I've > described? > > > > Adam Thompson > > Computer Scientist, Nuclear Engineering > > Oak Ridge National Laboratory > > +1.865.241.8062 > > > _______________________________________________ > Interest mailing list > Interest@qt-project.org > http://lists.qt-project.org/mailman/listinfo/interest > _______________________________________________ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
