I'd start by making functions that take arguments. For instance (defn draw-ball [ball] ...)
On Apr 13, 1:22 pm, Brandon Ferguson <bnfergu...@gmail.com> wrote: > I'm not sure if this is the place to ask this but I've been struggling > with a few things in the world of Clojure. I've been using Processing > to learn Clojure (since I'm somewhat familiar with Processing) but the > tough part has been dealing with things like x, y positions of objects > without keeping some global state (I'm not sure if it's even > possible). > > The code in question is:https://gist.github.com/887256 > > All this does is bounce a ball around a screen, for every frame > Processing calls draw which moves the ball one frame. Since I'm not > the one driving the loop I ended up using atoms to update some bits of > global state but that feels really dirty. > > If I could drive the frames it would be easy to use recur or some > other bit of state passing as I render each successive frame. I've > considered using sequences and passing a frame number (which would be > stored in a global as well) in but then it'd (I assume) have to run > through every number up to that the one I passed it. Seems like > performance would degrade the longer it ran. There's also this idea > rattling around in my head where I'd just rewrite the function > everytime with the new state - but seems like you couldn't scale that > to multiple balls bouncing around (which is the next step) - and God > knows what, if any, performance implications that would have. > > So I'm not sure where that leaves me - learning functional stuff can > be wonderfully mind breaking but sometimes I feel like I don't even > have the tools in my head to work some things out. Is there some > technique I'm missing for dealing with state between successive calls > of a function? > > How would you solve something like this? > -Brandon -- 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
