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From: Lawson.English@p88.f15.n300.z1.fidonet.org (Lawson English)
Newsgroups: comp.sys.mac.programmer
Subject: Re: Advice on icon animation wanted
Message-ID: <33018.27737F46@stjhmc.fidonet.org>
Date: 22 Dec 90 15:20:10 GMT
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Vasile R. Montan writes in a message to All

VRM> I tried this, and it didn't seem to work. I couldn't get the 
VRM> transfer mode to affect PlotIcon at all, which was why I wondered 
VRM> if there might not be some special considerations

From TechNote #055, Drawing Icons, by Jim Friedlander:

"[create two bit maps, one for the icon (iBitMap), one for the mask (mBitMap)]
 
Drawing icons as non-open is basically the same for online and offline 
volumes.
We need to punch a hole in the desktop for the icon. This is analogous to 
punching
a hole in dough with an irrecular shaped cookie-cutter. We can then sprinkle
jimmies* all over hte cookie and they will only stick in the area that we 
punced
out (the mask). We do this by copyBitsing the mask onto the desktop (whatever
pattern) to our destRect. For non-open, non-selelcted icons, we use the SrcBic
 
mode so we that we punch a white hole:

     SetRect(destRect,left,top,left+32,top+32);
     CopyBits(mBitMap, thePort^.portBits, icnRect,destRect,SrcXor,NIL);

Then we XOR in the icon:

     CopyBits(iBitMap, thePort^.portBits,iconRect,destRect,SrcXor, Nil);

That's all there is to drawing a icon as non-open, non-selected."
[...]
"*Jimmies: little bits of chocolate"

I trust that this will help? Get ahold of the TechNotes stack, it is well 
worth
your while...


Lawson
 

 

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