Path: utzoo!utgpu!attcan!uunet!cbmvax!steveb
From: steveb@cbmvax.UUCP (Steve Beats)
Newsgroups: comp.sys.amiga
Subject: Re: Transparent / opaque icon backgrounds
Keywords: icons
Message-ID: <5213@cbmvax.UUCP>
Date: 10 Nov 88 14:45:59 GMT
References: <4989@garfield.MUN.EDU>
Reply-To: steveb@cbmvax.UUCP (Steve Beats)
Distribution: na
Organization: Commodore Technology, West Chester, PA
Lines: 20

In article <4989@garfield.MUN.EDU> john13@garfield.MUN.EDU (John Russell) writes:
>Some icons I see require you to click on one of the non-background colours
>in order for the click to be registered. Others accept a mouse press anywhere
>in the rectangle they define, and when dragged their "background" colour
>obscures the screen underneath.
>
>What's different with these two sets of icons? Is it just a flag, something
>in the planepick, or something different in the image data itself?
>
>John

The difference you are seeing is related to the highlighting methods used
by the respective icons.  The icon editor allows you to specify backfill or
complemented highlighting.  Backfill only affects the icon in areas where
it contains non-background information.  Complement just inverses the whole
"select box" of that icon.  For reasons that escape me, it was decided that
the same information would be used for determining the "active" areas of an
icon too.

	Steve