On 24/02/2009, at 11:15 PM, rajesh wrote:
Need help with drawing (I have done some basic drawings in Cocoa)
Problem:
I have a View which in-turn has subviews(elements) e.g.,
chocolates ,balloons,roses , etc.,
These elements have complex drawings and are subclasses of NSView.
I place these elements on to the view with some gaps/space in
between (exposed part of main view), so far good , but I am really
stuck at a point where I have to draw a line/lines which connect all
the like elements or something like that.
When I attempt to draw a line joining the elements , line is drawn
then subViews are placed over it , but I want the other way around.
There should be something fundamental flaw or I am missing the big
picture.
I know that drawRect: is called first and the subViews are placed.
How should make my code to work as Intended
Subviews are drawn "on top" because conceptually they are in front.
My advice is general: don't (ab)use NSViews like this. I've seen quite
a few people doing this lately, or trying to, and it's actually one of
the first things that Apple advise against in the drawing guide. Using
an entire NSView to act as a moveable graphic within a larger view is
using a sledgehammer to crack a nut. It's very unscalable and will
quickly suffer from performance issues.
It's much easier to create lightweight drawing objects that are drawn
within one view. Apart from being much faster, you can overlay lines
or other things on top as you wish - it gives you much more control.
--Graham
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