Hi Paul,
>
> > >1. What Unit is RealType.Time?
> >
> > CommonUnit.secondsSinceTheEpoch (seconds since Jan 1, 1970, 00:00:00).
>
> If I use RealType.Time for my domain, the axis labels are in
> human-readable form. If I make my own RealType using the above unit, I
> get axis labels displayed in seconds (I presume). Why is that? I
> looked at the source (should have done that before I asked my question)
> and see RealType.Time uses a constructor that I can't use. Would that
> be why?
>
If you mean you want to have your axes labeled with a proper date
format, rather than with seconds, then the following code might help:
// construct a real type from Time and a RealTType from it
RealType[] time = {RealType.Time};
RealTupleType tdays = new RealTupleType(time);
// use VisAD's DateTime class to convert a date into double
DateTime staDate, stoDate;
staDate = new DateTime(1998, 1, 57060); // start date
stoDate = new DateTime(1998, 1+nDays, 57060); // end date
// optional: set date's format to your favourite one; see JDK Docs
java.util.GregorianCalendar
String dp = "dd.MM.yyyy";
staDate.setFormatPattern( dp );
stoDate.setFormatPattern( dp );
// convert date to doubles
double startAt, stopAt;
startAt = staDate.getValue();
stopAt = stoDate.getValue();
// create a domain set with the doubles
Set tdaySet = new Linear1DSet(tdays, startAt, stopAt, nDays);
// create a map
xMap6 = new ScalarMap( RealType.Time, Display.XAxis );
xMap6.setRange( startAt, stopAt); // optional ;-)
add it to the display.
You might also want to know about the methods:
ScalarType.alias(java.lang.String alias)
and
ScalarMap.setScalarName(java.lang.String name)
to set an alternative name for a ScalarType (i.e. RealType) and to set a
name for the ScalarMap, respectively. The latter should allow you to
have an axis label with blank spaces and all.
Hope it helps.
Cheers,
Ugo
