| Re: Object Programming [message #76043 is a reply to message #75967] |
Thu, 12 May 2011 12:45  |
David Fanning
Messages: 11724
Registered: August 2001
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Senior Member |
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Paulo Penteado writes:
>
> On May 11, 4:23 pm, David Fanning <n...@idlcoyote.com> wrote:
>> I guess that's right. I usually check to see if parameters
>> are undefined or not. In this case, because the actual programs
>> are wrappers to the PLOT command, I wanted to know how many
>> there were. Odd that I haven't run into this before, though. :-)
>
> Do you DG's plot (what I would guess by 'command')?
Yes, these are direct graphics objects. Fast, simple, etc.
> I ask because I know there are some peculiar pitfalls in NG's plot():
> instead of (what I expected) every class inheriting Graphic, and being
> able to inherit from them, in the usual way, it is a very convoluted
> system. I suspect the cause was to make it work while minimizing the
> changes or additions to the way the iTools were organized.
>
> The most confusing part is how the classes (like Plot) are created:
> The functions (like plot()) are not the usual init functions, they are
> separate functions that create a Graphic object (itself not created by
> a init function), informing it of what kind of graphic to make. The
> graphic() function creates the proper iTool, and and an object of the
> proper class, which is just a wrapper and contains the Graphic object
> inside.
>
> This is why I gave up on trying to inherit Window for a class, and
> contained it instead (you can see it at
> http://www.ppenteado.net/idl/pp_lib/doc/pp_multiplot__define .html). I
> do not remember whether it would be impossible or just complicated to
> inherit without changing the code in some of IDL's routines (which
> would be a very weird inheritance, if I had to change other code).
Say what!? The fact that I don't even understand *questions* about
function graphics, to say nothing of function graphics themselves,
is one of the reasons I am writing these CGS graphics objects. :-)
Cheers,
David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.idlcoyote.com/
Sepore ma de ni thui. ("Perhaps thou speakest truth.")
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