On Sunday, March 9, 2014 1:02:52 PM UTC, Laurent PETIT wrote: > > Hello, > > To be honest I don't see any fundamental difference between your first > attempt and the improvement: both share the fact that the mutation of the > state happens within the draw function. So in both cases, you have a > temporal coupling between updating the state of the app and rendering a new > view of the app's state. >
Yes, what's happening in both cases is very similar, but the function draw in the "functional" style, in my opinion, is easier to read and maybe it's also easier to test. > I would suggest that you don't swap! at all within draw, just deref and > render the result of the dereffing. > > And, in another thread, at potentially a totally different pace than the > redrawing's pace, update the application's state accordingly to business > rules / constraints. > > Schematically, something like this: > > (def app-state (atom (init-state))) > > (defn draw [...] > (let [app-snapshot (deref app-state)] > ... call quil primitives to render the application state snapshot > ...)) > > (future > ... logic which updates the app-state atom depending on business rules / > constraints, in a separate thread ...) > I never worked with future, this is exciting, but I have some questions. Do you mean that future is completely separate from draw? I'm just getting started, but draw is not only a function to draw, but as a side effect is the clock of the app, as it's called according to the set frames per second and you normally *take a step* en each draw. Would draw create these futures for the next draw? -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups "Clojure" group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
