On 8/29/11 1:17 PM, wadesli...@mac.com wrote:
One warning about extremely large views is that at some point you will run into
floating-point rounding errors, since AppKit and CoreGraphics coords are 32-bit
floats and have only 24 bits of precision. Still, that should get you to
millions of pixels before the coords stop being pixel-accurate.
64-bit AppKit is much better in this regard than 32-bit. If memory serves, it
lets you reliably operate NSScrollViews over dimensions in the billions.
At the moment I need to support power PC (I have 5 computers.) most at
least are running 10.5.8 which helps a lot.
I am not to worried about the rounding. Much of this code was coded in
postscript. So the graphics already are in floating point.
In some ways it is too bad I can not call the cocoa classes from a
postscript syntax, considering that the program already defines the data
in arrays of dictionaries. I think at one time there was interactive
postscript on the NEXT. Not sure if any of that still exists or not.
As for the original question. I am not sure I ever got it answered?
Simply where, as in what files, do I put the code that creates the
super view that describes all my lines? I do have the code working
that imports the data into the same array of dictionaries. The
imported array comes in at 20713.
Now I want to create a view that is 20713 lines high and 2600 lines
wide. I am pretty sure I create or subclass NSScrollview do do this?
Where do I put the code that sets this frame or clip area (which I think
is the superview?) If I make a subclass of NSScrollVew called cisView,
I get some basically empty files in the class, with no hints as to where
things go or what to override.
The "Scroll View Programming guide" has a code snippet (listing 1)
Creating a scroll view programetically. This however uses an ImageView,
which would require a data source that would read all the lines at
once. I only want to draw or update the lines contained in the array
that are visible dependent on where the scroller thumb is located.
-julie
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