objects in world [ c++ ]

[cassius]

Hi

 

What is the code for referencing all the objects placed in the world? or any one object in particular.

[Rick]

Looping over the world entities and checking names. I think world->entities is the list you want to loop over.

[cassius]

Would findchild work?

[drarem]

What I did awhile back was create a class with an array, loop through each entity and assign to the array. Then made a function to either find the 'player' and assign to array element. In the latter case I set up a #define and made it match it, so I could just do this:

 

#define player = 01

 

// --- find where player is as entity and

// --- set ent[player] = entity player

 

ent[player]->SetPosition(0,0,0);

 

Then I created methods to act on the entity such as setposition, getposition, etc. I wanted to keep everything in the class and portable, you may choose to handle it differently.

[Roland]

Looping through all entities in the World

 

// used somewhere inside a class
// assuming you have a pointer to the world
for_each( world->entities.begin(),
		    world->entities.end(),
		   [this](Entity* e) // 'this' may be needed or not depending on what you will do with the 'e' entity
{
	 // e is pointer to current entity
    // do what you need to do
});

[Rick]

Could use new C++ features to make it easier too:

 

This should work:

 

for(auto e : world->entities)
{

}

[cassius]

At the moment I place entities by code if I need to reference them. background objects are less important. I am debating now as to which is the most economical way to work,My existing method or one of the above.In le2 I used Blitzmax and that had a specific function for referencing entities placed in editor.

[Roland]

Could use new C++ features to make it easier too:

 

This should work:

 

for(auto e : world->entities)
{

}

 

Yeah. Even better. I'm starting to get to get old forgetting about the latest stuff. Thanks

[cassius]

I just did a google serch for "auto" gut didn't understand it.

What code would it replace if I were to use it.

[Rick]

auto just picks the type for you. You don't have to worry about knowing the type (like int, float, string, or if it's a class instance). It can just make it easier to type because you are telling the compiler to work that out for you while it compiles.

 

You can think of it as just being lazy . The main idea with the for loop is doing the : list part because it saves you from having to worry about the stl stuff (.begin(), .end(), iterator stuff which makes teh code look more confusing.

[cassius]

Well that's a better explanation than any I found on google.Thanks Rick.