Re: Scaling
Re: Scaling
- Subject: Re: Scaling
- From: "John C. Randolph" <email@hidden>
- Date: Sun, 26 Aug 2001 13:07:12 -0700
On Sunday, August 26, 2001, at 12:44 PM, Brian Howard wrote:
One of the main reasons I decided it was time to get involved with
Cocoa was the initial hype surrounding Quartz, especially the vector
scaling that allows for the Genie Effect and Dock Magnification
features. I have seen at least one other person ask about this some
weeks ago, but do not remember any response. Is this stuff all done
with NSAffine, or is there more to it? A quick glance at NSAffine leads
me to believe it can only be used for scaling within a View of some
sort. I want to scale an entire custom window! Any sample code lying
around that might shed light on how to do these tricks? Or is this
private Apple mojo?
Well, mathematically speaking, an Affine transform can't do a non-linear
effect like the genie trick. It's limited to rotation, translation, and
scaling.
The Dock magnification uses a bitmap interpolation routine that's not
published API yet. It *should* show up in NSImageRep at some point. I
asked Peter Graffigino (sorry if I misspelled that name) about it, and
apparently the image scaling code the dock uses was replaced at the last
minute before shipping 10.0, when it was discovered that the previous
technique made the diagonal cross-hatching on the wastebasket icon look
pretty bad.
-jcr
Support your right to protest a criminal nut-cult.
http://freehenson.da.ru/
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