player built structures?

[FaithfulNerd]

I don't know if I am remembering correctly but I thought I had seen a romhack or fan game that allowed the player to build structures.
if this has NOT been done yet. is it even possible?

 

[FaithfulNerd]

is it possible to take some code from 1 game, edit it, and place it in a different game?

 

[FaithfulNerd]

also, is it possible to have certain actions (code) work only in a given area of the map?

 

[WiserVisor]

I don't know if I am remembering correctly but I thought I had seen a romhack or fan game that allowed the player to build structures.
if this has NOT been done yet. is it even possible?

I believe this has been done before, though I can't remember the name of the hack(s) that did it. Basically anything would be possible in a rom hack or fan game, as long as you have the programming know-how and the hardware capacity to do it. The pokeemerald decomp gives a ton of flexibility with what you can do with it, only limited by one's own programming prowess.

is it possible to take some code from 1 game, edit it, and place it in a different game?

Yup, as long as you know how to properly integrate the code from one game into another.

also, is it possible to have certain actions (code) work only in a given area of the map?

That is most certainly possible. It's often done with an if-statement kind-of like this: if(gSaveBlock1Ptr->location.mapNum == MAP_NUM(ROUTE_1)). There are a variety of ways to do that.