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From: leue@galen.crd.ge.com (Bill Leue)
Newsgroups: comp.sys.mac.hypercard
Subject: Misc Easy HC Questions
Message-ID: <11792@crdgw1.crd.ge.com>
Date: 11 Sep 90 22:34:52 GMT
Sender: news@crdgw1.crd.ge.com
Organization: General Electric Research & Development
Lines: 36

Here's a couple of probably trivial HC questions.  I'm just getting
started using Hypertalk, so please be patient if these have been
hashed over before:

1. I can't find any way to either detect or simulate a double
click.  Is there any reasonable way?  For instance, it would
be useful to be able to say
	choose eraser tool
	double click
to erase the entire picture.  (Yes, I know you can say
"doMenu Select All" followed by "Cut Picture".)  Just asking.
As far as detecting a double click, I suppose it might be possible
to get the time in ticks on each click, then see if two clicks
(at the same coordinates, more or less) were separated by some
minimum number of ticks... hmmm, sounds tedious.

2. On a recent test stack I built, I implemented a little
compass-like widget whose "indicator" I update using the
drawing tools in a script.  As I read the various Hyperscript
docs, it seems that any changes I make to a card by using the
drawing tools are auto-saved by HC.  This means the stack is
continually growing, right?  What's the best way to keep the
stack size under control:  keep track of the freesize and
compact the stack whenever it gets too big?  Or can the
"Revert" menu command be used in a script?  My guess is that
it would be painfully slow to "revert" each time you draw
something on a card.

3. Has anyone come up with a clever way to simulate
arbitrarily-shaped buttons, a la Supercard?  Again, I could
define polygonal regions and then do geometric tests on the
mouse position, but this seems on first glance to be slow
and complex to implement with any kind of generality.

-Bill Leue
leue@crd.ge.com