NetNews Usenet Archive 1993 #1/NN_1993_1.iso/spool/comp/sys/mac/programm/20737

Internet Message Format | 1993-01-06 | 1.6 KB

Path: sparky!uunet!dtix!mimsy!mojo.eng.umd.edu!russotto
From: [e-mail] (Matthew T. Russotto)
Newsgroups: comp.sys.mac.programmer
Subject: Re: Detecting mouseDown in a region?
Message-ID: <[e-mail]>
Date: 5 Jan 93 23:29:33 GMT
References: <[e-mail]>
Organization: Project GLUE, University of Maryland, College Park
Lines: 27

In article <[e-mail]> [e-mail] (Art Urban) writes:
>
>Okay, here's the situation:
>
>I have many (let's say 1000) predefined regions in a window (CPane). When
>the user clicks in the window, one of the regions will have neccessarilly
>been hit, since they are all adjacent to one another. I need to determine
>which region was the recipient of the mouseDown.
>
>Am I supposed to loop through all my regions, checking PtInRegion() for
>each one until I get a hit? This seems very brute force, and could possibly
>become slow if the user clicks in the 1000th region. Is there any way I can
>reduce the possibilities?

You've mentioned the traditional way, and I believe one of the few ways
will work for arbitrary regions.  The opposite extreme is to make a
table mapping points to regions-- takes some setup and is memory
intensive, but will work.

If you know a little more about where the regions are, you could
eliminate some of the regions based on, say, which quadrant the mouse
was clicked on.
--
Matthew T. Russotto    [e-mail]    [e-mail]
Some news readers expect "Disclaimer:" here.
Just say NO to police searches and seizures.  Make them use force.
(not responsible for bodily harm resulting from following above advice)