[gameprogrammer] Re: dynamic array allocation in a class?

>>> daveslutzkin@xxxxxxxxxxx 6/10/2004 1:28:51 AM >>>
>Well, this code looks a lot like C code that's been shoehorned into a
>class, so there may be a better way to go.

It is C code... or was. I think I've got it fixed now, it's much
cleaner (to look at anyway) and does what I want it to. What's the
giveaway though, I'm curious?

I started programming in C several years ago, and never really did much
with it, but I got a fire lit under me recently and I'm trying to apply
what I already know in C to how I learn C++. Unfortunately, there's no
easy way for me to take a class on programming, so I'm having to
self-teach with books and mailing lists :)

>All right, the best way to do this is probably to use a STL vector,
as
>that's dynamically resizable and can give you some array bounds
overflow
>protection.  It should also definitely be fast enough for your
purposes. 
>The downside is that it won't be directly 2-dimensional, but this is
>barely a problem.

Not a problem at all, in fact I actually used the previous suggestion
of dynamically allocated 1-d arrays. The data isn't going to change once
it's loaded or generated, so I only need to allocate it once. Resize
would probably be overkill for this.

Here's what it looks like now: (btw, if anyone wants the actual code
I'd be happy to share)

typedef struct _vertex_structure {
        GLfloat x, y, z;
        } vertex;

typedef struct _texcoord_structure {
        GLfloat u, v;
        } texcoord;

typedef struct _triangle_structure {
        GLuint a, b, c;
        } tri;

class cSphere {
public:

        vertex *verts;
        texcoord *coords;
        vertex *face_normals;
        tri *faces;

        int num_verts, num_faces, col, row;

        cSphere::cSphere();
        int cSphere::Generate(int rows, int columns);
        int cSphere::Save(char *filename);
        int cSphere::Load(char *filename);
        void cSphere::Render(void);
        cSphere::~cSphere();
};

>If you're using the C++ STL for the first time, it's a good idea to
read
>about it.  Stroustrup's book, 'The C++ Programming Language' is good,
as
>is Josuttis' 'The Standard Template Library' (I think that's the
title).

Couldn't find either of those when I went looking, so I picked up 'STL
Programming from the Ground Up' by Schildt. His C++ book by a similar
name is much, much easier for me to learn from than the other C++ books
I have. Haven't had a chance to get into STL much, but hopefully I will
soon.

Thanks,

-Justin



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