Comments on: SDL Entities

By: Terrence

Terrence — Sun, 28 Feb 2010 04:24:21 +0000

Hello, and thanks for the tutorials! They have helped me improve my code flow and organization 100 fold!

My problem is however, when I run this program, the Yoshi image only animates once, and then it stops. I assumed I needed to set Oscillate but that doesn’t work either.

Why doesn’t this animation loop?

By: kahshoo-heem

kahshoo-heem — Sat, 30 Jan 2010 13:07:25 +0000

Also, instead of using “-lGL”, I’m using “-lOpenGL32″ and/or “-lglu32″ at my mingw environment to compile opengl applications.

By: kahshoo-heem

kahshoo-heem — Sat, 30 Jan 2010 01:42:50 +0000

Can you get to compile a simple console program like “Hello World”? I think you might try this at first, before running applications that depend on SDL or other specific libraries.

By: Ersan Güray

Ersan Güray — Thu, 21 Jan 2010 18:10:57 +0000

My question is not related with entities. I am using andLinux(Ubuntu) on Windows. I would like to execute .exe files also on Windows. I tried mingw32 but still there existed errors like :

To compile:

>i586-mingw32msvc-g++ CApp.cpp -o CApp.exe -lGL -lSDL -lSDLmain -lSDL_ttf -lmingw32 -I/usr/i586-mingw32msvc/include/

error:
/usr/lib/gcc/i586-mingw32msvc/4.2.1-sjlj/../../../../i586-mingw32msvc/bin/ld: cannot find -lGL
collect2: ld returned 1 exit status

I am using this command to compile as usual:

> g++ CApp.cpp -o CApp.exe -lGL -lSDL -lSDLmain -lSDL_ttf

and resulting CApp.exe works well on Linux. What to add for Windows executable files?

So, do you have any idea for this?

By: Tim Jones

Tim Jones — Tue, 19 Jan 2010 12:07:14 +0000

Fixed comments for ya.

By: James

James — Sun, 13 Dec 2009 21:59:37 +0000

Hi again!
I realized that my error must come from how the vector is passed when I call CEntity::GetEntityList(). Once I changed the definition to
static std::vector & GetEntityList()
it worked!
James

By: James

James — Sun, 13 Dec 2009 02:24:49 +0000

Hi Tim!
Thanks for the great tutorials! I’ve worked through all of them thus far and I have learned SO much! I just had a question about this tutorial. I wanted to keep the vector private so I moved the definition and then added an accessor function as follows:
In the header:
static std::vector GetEntityList()
{

return EntityList;

}

Now, instead of directly using EntityList, I call the accessor. The problem that I am having is with the push_back calls. ie.

CEntity::GetEntityList().push_back(&Entity1);
CEntity::GetEntityList().push_back(&Entity2);

If I call the empty() function right after this, it returns true. Also, if I move the definition in the header back to public, it still has this problem. Only when I access the public vector directly can a push_back() call increase the size() of the vector.

Am I missing something? This seems odd to me that I am unable to use the accessor… Any advice would be greatly appreciated!

Thanks,
James

By: Blizz

Blizz — Thu, 22 Oct 2009 18:15:45 +0000

It works now, I have no Idea why, but it works the way I did it above…

Thanks, going for the other tutorials now!

By: Blizz

Blizz — Thu, 22 Oct 2009 18:04:41 +0000

CEntity Entity3 is just under the other two entities in CApp.h.

Like that:

Capp.h:
private:
CEntity Entity1;
CEntity Entity2;
CEntity Entity3;

OnInit:

if(Entity1.OnLoad(“entity1.bmp”, 64, 64, == false) {
return false;
}

if(Entity2.OnLoad(“entity2.bmp”, 64, 64, == false) {
return false;
}

if(Entity3.OnLoad(“entity2.bmp”, 64, 64, == false) {
return false;
}

CEntity::EntityList.push_back(&Entity1);
CEntity::EntityList.push_back(&Entity2);
CEntity::EntityList.push_back(&Entity3);

By: Tim Jones

Tim Jones — Thu, 22 Oct 2009 17:51:02 +0000

Can I ask where CEntity Entity3 is in your code? It has to be somewhere where it won’t be destroyed (like as a part of CApp).