How can one control the display color rendered on the screen from a
UnionSet? I have something like
// construct river system
Gridded2DSet[] river_system = {river};
UnionSet rivers = new UnionSet(earth, river_system);
// create a DataReference for river system
final DataReference rivers_ref = new DataReferenceImpl("rivers");
rivers_ref.setData(rivers);
// create a Display
DisplayImpl display = new DisplayImplJ2D("image display");
// map earth coordinates to display coordinates
ScalarMap longMap = new ScalarMap(RealType.Longitude, Display.XAxis);
ScalarMap latMap = new ScalarMap(RealType.Latitude, Display.YAxis);
display.addMap(longMap);
display.addMap(latMap);
// link the Display to rivers_ref
display.addReference(rivers_ref);
When I have run this code in the past, the river system has been drawn in
white: today, it draws in black. Since I had always intended to grab
control of the colors anyway, this seems like a good time.
Normally, I would hunt for the control on the relevant ScalarMap, which I
would expect to look something like
ScalarMap map = new ScalarMap( tempType, Display.RGB);
However, there isn't any mapping of the display type here: just the
definitions of the axis.
Which brings me to a deeper question: since the above code only defines
mappings for the XAxis and YAxis, why does anything appear at all?
Thanks in advance,
Edward
