Erlang automata playground with websocket-driven visualization

This project uses rebar to manage dependencies and compile.

./rebar get-deps
./rebar compile
./rebar generate
rel/etoma/bin/etoma console

Then point your browser at http://localhost:8080/. Note, if you modify any of the javascript files (in apps/etoma_sock/priv), you can copy them to the built release (without having to completely recompile and build) by running rake static.

Create an object with id = 0 at (x,y) = (100, 100) with a circular behavior via the erlang console:

(etoma@127.0.0.1)1> etoma:new(0, 100, 100, etoma_behavior:circular(5, 0.25)).
{ok,<0.1176.0>}

Change the behavior of the object to add noise by first getting the behavior and then composing it with a noise generator:

(etoma@127.0.0.1)2> {ok, C} = etoma:get_behavior(0).
{ok,#Fun<etoma_behavior.1.102839409>}
(etoma@127.0.0.1)3> NoisyCircle = etoma_behavior:compose(C, etoma_behavior:normal_walk(5)).
#Fun<etoma_behavior.5.102839409>
(etoma@127.0.0.1)4> etoma:change_behavior(0, NoisyCircle).
ok

Stop the object by replacing its behavior with a stationary function:

(etoma@127.0.0.1)5> etoma:change_behavior(0, etoma_behavior:stationary()).
ok

The basic websocket framework is taken from the Cowboy websocket example. Animation is via Paper.js.

I built this project to explore using Erlang to program simple dynamic objects, with the idea that each object would be an Erlang process and that "behavior" would be defined by functions and modifyable using ideas from functional programming.