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From: palmer@tybalt.caltech.edu (David Palmer)
Newsgroups: comp.sys.mac.programmer
Subject: gGopher question
Message-ID: <11945@cit-vax.Caltech.Edu>
Date: 18 Sep 89 17:31:54 GMT
Sender: news@cit-vax.Caltech.Edu
Reply-To: palmer@tybalt.caltech.edu.UUCP (David Palmer)
Organization: California Institute of Technology
Lines: 41

I just upgraded to Think C 4.0 (WOW!) and am diving in to object-oriented
programming.

I am writing a special purpose drawing program in Think C 4.0, and I need
help.  (The drawing portion of the program is a major part of a 3-D simulator.)

1) Has anyone developed a class structure good for drawing that they could
    place in the public domain?

2) Should the Ancestor class of the drawn objects be CBureaucrat?
    (Drawn objects respond to commands, keys, and mice, so I guess so.)

3) The documentation for CBureaucrat says that a Bureaucrat should handle
    Keys and Commands, which are automagically passed to it when it is
    the gGopher, but it doesn't say what happens to Mouse clicks.
    Are they also sent to the gGopher?

4) What should the flow of control be?  Should the selected drawing object
    become the gGopher (or the Pane if nothing is selected), or should
    the Pane (or the Document?) handle mouse clicks and commands, passing
    them on to the currently selected object?

5) Can an Object be written-to and read-from a file in the standard
    manner? (with the Mac equivalent of
	 fwrite(*Object, sizeof(object), 1, stream)
    where *Object is the first argument and singly indirects the handle
    of Object to get a pointer.)  How are objects within objects best handled?
    (By which I mean references to objects.  For instance, each object
    may have a list of the objects touching it, etc.)
    I am currently planning to keep all objects in lists, and, at save time,
    replace the contained object's handle with an index into the list.  It
    is ugly, but I can't think of any other way to do it.

Thanks in advance.

		David Palmer
		palmer@tybalt.caltech.edu
		...rutgers!cit-vax!tybalt.caltech.edu!palmer
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