Swifty refactorings #1
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Use CGFloat for everything instead of float, hence requiring no casts! Better naming for some things. Less state (no need for yFromDragOrigin to be a field)
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As I was studying this code I decided to refactor and improve a few things. In general I've tried to:
Also, I've necessarily updated to latest Swift standards (2.1) so that XCode (7) was happy with it.