questions on entity preloader in C++

[drarem]

I took the plunge and steam-purchased both lua and c++ versions. BTW running x64 Linux LXDE (Ubuntu). So far pretty neat stuff.

 

Is there a better option to my idea of creating a preloader for something like this in c++? I found the code below in the forum, and perhaps want to enhance it so I don't have to loop through all the entities to find the one I want to make an impact to.

 

    list<Entity*>::iterator iter;
    for (iter = world->entities.begin(); iter != world->entities.end(); ++iter){
	  Entity* currEnt = (*iter);
 //	    cout << "Entity loaded: " + currEnt->GetKeyValue("name") << endl;
	  if (currEnt->GetKeyValue("name") == "barrel1"){
	   currEnt->Turn(0,0,1);
	  }

 

In psuedo, here's what I'm thinking of doing..

 

enum { bear, pot, pan, knife, gun, gold piece };
class Entities;
Entities entities = new Entities[255];  // up to 255 'objects'
    list<Entity*>::iterator iter;
    for (iter = world->entities.begin(); iter != world->entities.end(); ++iter){
	  Entity* currEnt = (*iter);
	  if (currEnt->GetKeyValue("name") == "bear1"){
		 entities[bear].entity = currEnt;
	  }
	  if (currEnt->GetKeyValue("name") == "pot"){
		 entities[bear].entity = currEnt;
 }
..
..
  // now i know how to move or kill the bear for example
  // or pick up the gold piece, only if i can figure out how to check for collisions in c++

[Roland]

You can see me showing an alternative method using hooks in this video (at around 17:00 )

 

http://youtu.be/Utb3z4hs79Q?t=17m14s

[martyj]

I think your question might be related to mine. Basically you have entities in the map that you wish to use c++ code with.

 

http://www.leadwerks.com/werkspace/topic/11361-inheritance-and-entity-objects/

 

Here is the solution that I came up with.

 

Create classes in C++ for your entity. Have the classes use Hooks http://www.leadwerks.com/werkspace/page/documentation/_/command-reference/object/

 

Using ToLua++, you can create a Lua function to assign your entity to a class that has an entity property.

http://lua-users.org/wiki/BindingCodeToLua

[drarem]

Correct, how to use entities with C++. I'm trying it this way, so far except for maintenance when i add a new object I want to manipulate, it seems ok. What I want to do is only update the enum, change the enum item to a string so I can match it automatically in the pre-loader function. Perhaps something like this or with the hooks, could be implemented in the leadwerks engine, where you can manipulate the object as named in the editor.

 

 

enum { none, barrel, cardboardbox, ship1 }

 

entities *ents;

ents = new entities(world, 255); // up to 255 objects

 

 

ents->turn(cardboardbox, 0.1, 0, 0); // rotate cardboardbox entity