If you keep the animation short (say 1.5 to 2 seconds) the freezes might not be
too irksome to the user, but eliminating them altogether would require adding
NSOperationQueues and NSInvocationOperations to the mix and this is even too
hokey for me :)
With CALayers, you could create 10 different layers each with a different
subset of lines right in your setFrame method (or whichever methods cause the
drawRect to trigger) Then with those animation frames in hand you could set up
an animator to composite a new layer at some appropriate interval. As I said,
I'm very new to CALayers myself, so I don't know exactly how to do this, but
the complexity (and uglyness) of the roll-your-own solution makes CALayer look
like an attractive option.
-
On Jun 19, 2011, at 9:57 AM, Matthias Arndt wrote:
> Hi Ken,
>
> Am 19.06.2011 um 15:40 schrieb Ken Tozier:
>
>> - (void)observeValueForKeyPath:(NSString *) inKeyPath
>> ofObject:(id) inObject
>> change:(NSDictionary *) inChange
>> context:(void *) inContext
>> {
>> if ([inKeyPath isEqualToString: @"subsetRange"])
>> {
>> // figure out how many lines you still have to draw here
>> if (stillHaveLinesToDraw == YES)
>> {
>> sleep(<some number of ticks>);
>> [self setNeedsDisplay: YES];
>> }
>> }
>> }
>
> Thanks for this speedy reply! Using a KVO observer is a new approach I
> haven't considered, yet. But the main difference to my first idea is the
> usage of repetitive invocations of "drawRect:" instead a loop inside the
> method itself. To make this a slow-motion, you mentioned a "sleep(...)"
> (wasn't included in the mailing list reply), which will freeze the GUI, won't
> it?
>
> CAAnimation sounds promising, unfortunately I haven't used it before, and
> animating several paths doesn't seem to be covered with basic animations ...
> I'd look deeper into the references, but currently I'm afraid it's beyond my
> capabilities.
>
> Matthias
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