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
