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IDL objects (not object graphics) tutorial? [message #46457]

Wed, 23 November 2005 18:33

Richard French
Messages: 173
Registered: December 2000

Senior Member

I'd like to learn how to make use of IDL objects. I'm not ready for object
graphics yet, because I'd like to understand INITS and SELF and classes and
methods before worrying about viewports and plots disappearing because I am
not using the correct projection scheme. I've scoured the web in vain
looking for a simple tutorial on how and when to use objects in IDL. I've
found a few generic tutorials praising the virtues of object-oriented
programming, but almost none of the examples give me any sense of why one
would go to the trouble. For example, one tutorial describes an object that
can return constants such as the speed of light or Planck's constant, but it
isn't obvious to me why this is superior to a simple function that returns
clight() or PlancksConst().

What I am looking for is something with a simple application or two in which
it is both clear why using objects is superior AND which explains what is
meant by self and methods and classes. Without some specific examples to
look at, I am having a hard time making sense of the nomenclature or of the
value of the approach.

This is prompted in part by David's nifty little pixmap object that I've
already made use of in a new program - thanks, David.

Someone must be out there just waiting to get rich writing a book on this
topic. The second volume can be about object graphics - I'd settle for the
first volume for now - a gentle introduction to objects in IDL. Any
suggestions? Thanks!

Dick French

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[Message index]

		IDL objects (not object graphics) tutorial? By: Richard French on Wed, 23 November 2005 18:33
		Re: IDL objects (not object graphics) tutorial? By: b_gom on Thu, 24 November 2005 01:04
		Re: IDL objects (not object graphics) tutorial? By: Paul Van Delst[1] on Fri, 02 December 2005 08:30
		Re: IDL objects (not object graphics) tutorial? By: David Fanning on Fri, 02 December 2005 08:11
		Re: IDL objects (not object graphics) tutorial? By: Paul Van Delst[1] on Fri, 02 December 2005 07:46
		Re: IDL objects (not object graphics) tutorial? By: Richard French on Wed, 30 November 2005 18:36
		Re: IDL objects (not object graphics) tutorial? By: dzarro on Tue, 29 November 2005 20:20

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