Suppression of bounds expansion upon call to scaleUnitSquareToSize
Suppression of bounds expansion upon call to scaleUnitSquareToSize
- Subject: Suppression of bounds expansion upon call to scaleUnitSquareToSize
- From: Aaron Braunstein <email@hidden>
- Date: Mon, 24 Jan 2005 12:23:20 -0800
OK, I'm sure this is another example of somebody overlooking the obvious - even when they've RTFM, but with the philosophy of "the only stupid question is the question left unasked" I'm gonna ask anyway. :)
In brief, I've got an NSView subclass in which I'd like to implement a zoom/shrink feature. scaleUnitSquareToSize seems to do everything that I need it to do, with one exception: it re-scales the rect of my view. I know that it is supposed to do this, but this causes problems in that if you envision the area (which lives within a scroll view, if that makes any substantive difference) as a sheet of paper of a certain size upon which you can draw, then using scaleUnitSquareToSize with size parms of < 1 to shrink it the paper grows in terms of co-ordinates. This means that you could draw on regions of the paper that were previously unavailable and - worse - which will disappear when the page is zoomed later via size parms > 1 (due to the area's bounds rect being shrunk to scale.)
The obvious thought is to simply re-set the area's bounds, but that act also carries an implicit re-scale... so in effect I am undoing re-scaling back to right where I was when I started. I've tried a number of other solutions, none of which have worked. Before I start down the seemingly-far-too-convoluted path of creating an off-screen area to be swapped in at need to see if THAT will work, I figured I'd ask the bigger brains available on this list. Does anybody have any suggestions for exploration?
--
Aaron Braunstein
"Good enough" shouldn't be.
From there the fall into mediocrity and indifference is a short one. _______________________________________________
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