Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!pacific.mps.ohio-state.edu!linac!att!rutgers!cbmvax!cbmehq!cbmger!peterk
From: peterk@cbmger.UUCP (Peter Kittel GERMANY)
Newsgroups: comp.sys.amiga.programmer
Subject: Re: Clicking on irregular shapes?
Message-ID: <1029@cbmger.UUCP>
Date: 28 Mar 91 13:33:41 GMT
References: <1991Mar27.212214.6204@orfeo.radig.de>
Reply-To: peterk@cbmger.UUCP (Peter Kittel GERMANY)
Organization: Commodore Bueromaschinen GmbH, West Germany
Lines: 23

In article <1991Mar27.212214.6204@orfeo.radig.de> eric@orfeo.radig.de (Eric Tuerlings) writes:
>
>I can remember there was a discussion last year about: "Clicking on
>irregualar shapes". Because I want to use irregular shapes to click on,
>I am interested in a solution to this problem, since I found nothing else
>than to click on rectangle shapes only.

How about this brute force attempt:
When the user clicks, you do a flood fill from that point with a
certain color different from the previous one. Previously you have stored
for every shape on your screen a (x,y) coordinate pair. Then you do 
a loop and look in every of these shapes at that very point, if it
changed its color (the flood fill should have reached also this).
Thus you get two effects: The user gets an immediate feedback where
he clicked, and you can find which shape it was. (I imagine you want
to do something like clicking on a world map and identifying the
country.)

Hello to Frankfurt!

-- 
Best regards, Dr. Peter Kittel  // E-Mail to  \\  Only my personal opinions... 
Commodore Frankfurt, Germany  \X/ {uunet|pyramid|rutgers}!cbmvax!cbmger!peterk