I have two subviews sv1 and sv2 that I've animated by setting their
center properties inside of an animation block. This animation code is
in sv1.m and sv2.m. It all works just fine: they both move smoothly
around in the superview by choosing new centre points in a continuous
loop. It looks quite cute, really.
What I want to do now is detect when they come within a certain
distance of one another as they're moving. But when I do this to move
them:
sv1.center = p1;
sv2.center = p2;
their center properties are set immediately to the new values: i.e.
they can't be read to find the intermediate positions. So I can't use
these properties to find out if their centres come within a given
distance of one another.
I've thought of some possible approaches:
1. Having the superview controller calculate whether the lines between
the animation start and finish points intersect, and whether sv1 and
sv2 will be at the intersection at the same time.
2. Breaking up the straight line moves into much smaller segments and
having the center properties set successively to those.
3. Having the superview controller handle the animation and somehow
keep track of the subview's relative distances.
4. Using keyframe animation instead.
#1 seems rather complicated. #2 seems likely to lead to a choppy
animation, and would rule out using the speed-up-then-slow-down
animation mode. #3 would involve throwing out a lot of the code I've
written so far. And I don't yet have a clue whether #4 is plausible,
not having used keyframe animation before.
If there are any other suggestions, I'd be grateful to hear them!
dkj
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