Discuss about `rvx, rvy` in `collection-map.js`

[finscn]

Discuss about rvx, rvy in collection-map.js

there is a function with arguments named rvx, rvy , What do they mean? what's the full name ? https://github.com/phoboslab/Impact/blob/7768fd29c70ca924a78673d93081baab5a72fbe6/lib/impact/collision-map.js#L63

---

the _traceStep() be called with vx & vy https://github.com/phoboslab/Impact/blob/7768fd29c70ca924a78673d93081baab5a72fbe6/lib/impact/collision-map.js#L44

Why do you pass vx , vy ? in my opinion , at line 44 , It should pass sx ,sy

---

the function _traceStep has arguments rvx, rvy , and pass them into _checkTileDef() https://github.com/phoboslab/Impact/blob/7768fd29c70ca924a78673d93081baab5a72fbe6/lib/impact/collision-map.js#L95

https://github.com/phoboslab/Impact/blob/7768fd29c70ca924a78673d93081baab5a72fbe6/lib/impact/collision-map.js#L104

https://github.com/phoboslab/Impact/blob/7768fd29c70ca924a78673d93081baab5a72fbe6/lib/impact/collision-map.js#L142

https://github.com/phoboslab/Impact/blob/7768fd29c70ca924a78673d93081baab5a72fbe6/lib/impact/collision-map.js#L150

Why do you pass rvx , rvy ? in my opinion , at line 44 , It should pass vx ,vy.

---

I post a PR , Just for comparing the differences in the code

https://github.com/phoboslab/Impact/pull/100/files

If change the code to my version, will there be any problems?