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From: tim@nijinsky.ipac.caltech.edu (Tim Conrow)
Newsgroups: comp.sys.handhelds
Subject: HP48: Displaying PICT; is there another way?
Message-ID: <1991Apr23.175400.8672@nntp-server.caltech.edu>
Date: 23 Apr 91 17:54:00 GMT
Sender: news@nntp-server.caltech.edu
Organization: California Institute of Technology
Lines: 28

Hi all,

I was working on my own home grown calender program (as though there
weren't enough out there already) and am trying to build some inter-
activeness (interactivity?) into it. The folks at HP were very good
about making this possible by providing key trapping functions and nice
ways to modify graphics objects easily, but I know of only two ways to
re-display an altered GROB. One is to use PVIEW, which is unacceptable
because the keyboard is taken over, and the other is a sequence like

... PICT RCL \->LCD ...

which seems wasteful, and makes the display blink annoyingly when PICT
is rewritten (it may be slowing things down too).

So what am I missing? How does one update a displayed GROB as fast as
possible in response to a key press, preferably "in place", i.e. w/o
having to go through an \->LCD phase? (How is it done, for example, in
the periodic table display on the EQ LIB card?)

E-mail would be fine unless you think the answer is of general interest.
C'mon, y'all haven't let me down yet!

Thanks very much for your attention. If the results are what I hope for
the program may be worth posting.

-- Tim Conrow
tim@ipac.caltech.edu