I'm using GCDrawKit, which has been an amazing help in getting my app's
interface together. However, I've run into a problem that's making me slightly
crazy...
My main view is a zooming scroll view. Thanks to drawKit, I generally have no
problems at all; it handles the zooming beautifully, so I don't even think
about it. However, what I need to do now is to have certain objects remain in a
fixed position, relative to the viewable area -- so if, for example, an object
is in the upper-left corner, it will remain there during scrolling and zooming
(I DO want it to zoom, but it should stay in the upper-left corner). I managed
to get this working (or I thought I did), by telling my enclosingScrollView to
post frame changed notifications, then using those to update the position of
the object.
- (void) updateWithScroll
{
NSPoint selfOrigin = [self location];
DKDrawingView* view = [(DKDrawingDocument*)[[self drawing] owner] mainView];
NSRect bounds = [[[view enclosingScrollView] contentView] bounds];
NSPoint origin = bounds.origin;
if(self.lockXPositionToContentRect)
{
selfOrigin.x = origin.x + scrollOffset.x;
}
if(self.lockYPositionToContentRect)
{
selfOrigin.y = origin.y + scrollOffset.y;
}
[self setLocation:selfOrigin];
}
But unfortunately I forgot about zooming, so my objects only stay in their
correct positions if I'm either: A) at a zoom scale of 1.0, or B) the scroll
view is at the document's origin (i.e., 0,0 for both document and view). How do
I do this for both scrolling and zooming?
(I tried multiplying the location coordinates by the scaling amount, but that
doesn't quite do it -- it's closer, but not correct.)
Any help appreciated.
J.
------------------------------------------------------
James B. Maxwell
Composer/Researcher/PhD Candidate
[email protected]
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