| Re: combining object and direct graphics [message #12647] |
Mon, 10 August 1998 00:00 |
davidf
Messages: 2866
Registered: September 1996
|
Senior Member |
|
|
Don Shad (dschad@frontiernet.net) writes:
> is it possible to combine object graphics and direct
> graphics in the same window? can it be done
> without having to employ
> some trickery like creating a pixmap and then
> sending those data to an image object, which you
> then over-lay in a draw object? i would
> like to be able to work in DATA cooridinate usings
> both objects and direct graphics in the same window.
> for example,
> i'd like to create a contour map (w/ CONTOUR) and
> then drop my objects at specific data coordinates
> over top of the contour map.
No, without employing some kind of trickery (and even
then I am not convinced it would work satisfactorily)
you CANNOT combine object graphics and direct graphics
in the same graphics window. Object graphics and
direct graphics are (currently) two completely separate
graphics systems and you must select the system and
a graphics window appropriate to that system to display
graphics.
Moreover, unless you are using a 24-bit color display,
it is even difficult to combine direct and object
graphics programs (or windows) in the same IDL session
due to the completely different ways in which they use
and load color tables.
This, unfortunately, makes it critical that you
carefully weigh the pros and cons of building programs
in one system or the other. Object graphics is clearly
the choice if interactive 3D graphical display is of
utmost importance. However, this must often be weighed
against more difficult printer and hardcopy output support,
as well as the type of computer environment your programs
will be running in. Sometimes it makes more sense to
write direct graphics programs in an object-like way,
in order to take advantage of the best parts of both
systems.
Cheers,
David
--
David Fanning, Ph.D.
Fanning Software Consulting
E-Mail: davidf@dfanning.com
Phone: 970-221-0438, Toll Free Book Orders: 1-888-461-0155
Coyote's Guide to IDL Programming: http://www.dfanning.com/
|
|
|
|
comp.lang.idl-pvwave archive
Members
Search
Help
Login
Home
