Flash :: Calculating Distance Just From Speed?
Jun 17, 2011
I'm creating a drag based control in Flex / Flash, similar to a film strip, where an individual can swipe horizontally to scroll through the items. To make the control feel a bit more natural I've added some inertia to slow the scrolling once a swipe has taken place. When first loaded up there will be five items in view with 'x' numbers of items to scroll through with the 3rd item centred and selected.
My problem though is that I want, when animating, a swipe gesture to determine whether an item will end up the middle (3rd position) and adjust its movement calculation accordingly so it docks with the 3rd / centre position. Imagine you perform a long swipe, it flys pasts 'x' amount of items, but as it slows to a stop it elegantly stops with an item centred / in the 3rd position. To do this I believe I need to determine the distance to travel just from the speed value (as time is irrelevent to the user experience, i.e. a longer / stronger swipe would justify a longer animation skimming through the items).
At the moment I'm invoking the animation routine (with inertia) in the ENTER_FRAME event when the user generates a MOUSE_UP event. When they do this, I obtain the speed of drag (by monitoring this beforehand) and then decrement this speed value on each call of the ENTER_FRAME event until it reaches an appropriate value to stop the animation.
Unfortunately all the speed calculations I've seen deal with Speed and Time to determine distance, I just need Speed. Admittedly, my knowledge isn't strong in this area so I might be missing the obvious.
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