Learning C++ Space Shooter

//Main.cpp

//The program is semi-loosely based off of a tutorial. A very helpful tutorial.
#include "CEvent.h"

int main ( int argc, char* argv[] )
{
    CEvent event;
    event.Load();
    event.Init();
    while(event.State())
    {
        event.Input();
        event.Draw();
        event.Update();
    }
    event.Cleanup();
    return 0;
}

//TODO: Put pictures on a working dialog                                -DONE
//TODO: Make picture move                                               -DONE
//TODO: Addendum: Keep sprite in dialog                                 -DONE
//TODO: Eat food                                                        -DONE COUNTLESS TIMES
//TODO: Take asprin                                                     -AVOIDED FOR NOW...BARELY
//TODO: Figure out that most alien of concepts(Game Loop)               -IN PROGRESS
//TODO: Add collision with other objects                                -IN PROGRESS (Considering Asprin)
//TODO: Make fancy lasers that start at one sprite and end at another   -NOT STARTED
//TODO: Make laser hurt a sprite                                        -NOT STARTED
//TODO: Think of more to do                                             -PREFER NOT TO NEED ASPRIN YET



//GameData.h

#include <SDL.h>

//Good enough for now...Like a little control panel
int SCREEN_WIDTH = 800;//For debugging purposes
int SCREEN_HEIGHT = 600;//See above
int BPP = 32;//Seems like a good number
int PLAYER_WIDTH = 20;//Size of sprite in use
int PLAYER_HEIGHT = 20;//See above
int srcx = 0;//12;
int srcy = 0;//12;
int dstx = 0;
int dsty = 0;
bool keys[323] = {false};//Done by a tutorial creator. Yes, I'm clueless
SDL_Event event;//Seems like a popular name
SDL_Surface *background = NULL;//Gotta have some flavor: Placeholder
SDL_Surface *sprite = NULL;//A two minute toothless space fighter: Placeholder


//CEvent.h

#include "GameData.h"

class CEvent
{
public:
    void Load();
    void Init();
    void Input();
    void Draw();
    void Update();
    void Cleanup();
    bool State();
    //I have no clue as to wether or not these next 3 are in the correct location
    void Apply_Surface(int x, int y, SDL_Surface * source, SDL_Surface * destination);
    void Draw_Sprite (int srcx, int srcy, int dstx, int dsty, int width, int height, SDL_Surface *source, SDL_Surface *destination);
    void Collision(int Vertical_Axis_1, int Horizontal_Axis_1, int Vertical_Axis_2, int Horizontal_Axis_2);
private:
    SDL_Surface *screen;
    bool running;
    bool Collided;
};

void CEvent::Load()
{
    //It said load...so I loaded sprites: I consider the background to be a sprite
    background = SDL_LoadBMP("starfield.bmp");
    sprite = SDL_LoadBMP("ship1.bmp");
    //SDL_Init(SDL_INIT_EVERYTHING);
}

void CEvent::Init()
{
    running = true;
    //It has INIT in it...you guessed it. I put it in Init()
    SDL_Init(SDL_INIT_EVERYTHING);
    //I figured the main window should be an important part of the INIT process
    screen = SDL_SetVideoMode(SCREEN_WIDTH, SCREEN_HEIGHT, BPP, SDL_HWSURFACE | SDL_DOUBLEBUF | SDL_NOFRAME | SDL_FULLSCREEN);
    //Goes with the window, in my confused mind
    SDL_WM_SetCaption("YouTube Tut 01", NULL);
}

void CEvent::Input()
{
    if(SDL_PollEvent(&event))
    {
        //The scary red x
        if(event.type == SDL_QUIT)
        {
            running = false;
        }
        if(event.type == SDL_KEYDOWN)
        {
            keys[event.key.keysym.sym] = true;
        }
        if(event.type == SDL_KEYUP)
        {
            keys[event.key.keysym.sym] = false;
        }
    }
    //using key to exit rather than the red x. I dislike using the red x
    if(keys[SDLK_q])
    {
        running = false;
    }
    //..........................Fun with keys..........................
    //Put center of sprite in center of screen. I couldn't believe it worked perfectly on my first attempt. Woo! Hoo!
    if(keys[SDLK_1])
    {
        dsty = ((SCREEN_HEIGHT/2) - (PLAYER_HEIGHT/2));
        dstx = ((SCREEN_WIDTH/2) - (PLAYER_WIDTH/2));
    }
    //Trying and failing to remove sprite: Game crashes, unfortunatly
    if(keys[SDLK_5])
    {
        SDL_FreeSurface(sprite);
    }
    if(keys[SDLK_0])
    {
        dsty = 0;
        dstx = 0;
    }
    if(keys[SDLK_UP])
    {
        if(dsty > 1)
        {
            dsty -= 5;
        }
    }
    if(keys[SDLK_DOWN])
    {
        //Still has an empty pixel on the bottom. Is it SDL's fault? Probably not.
        if(dsty < (SCREEN_HEIGHT - (PLAYER_HEIGHT/* + 1*/)))
        {
            dsty += 5;
        }
    }
    if(keys[SDLK_LEFT])
    {
        if(dstx > 0)
        {
            dstx -= 5;
        }
    }
    if(keys[SDLK_RIGHT])
    {
        //Same empty pixel problem as SLDK_DOWN
        if(dstx < (SCREEN_WIDTH - (PLAYER_WIDTH/* + 1*/)))
        {
            dstx += 5;
        }
    }
}

void CEvent::Draw()
{
    Apply_Surface(0, 0, background, screen);
    Draw_Sprite(srcx, srcy, dstx, dsty, PLAYER_WIDTH, PLAYER_HEIGHT, sprite, screen);
}

void CEvent::Update()
{
    SDL_Flip(screen);
}

void CEvent::Cleanup()
{
    SDL_FreeSurface(sprite);
    SDL_FreeSurface(background);
    SDL_Quit();
    exit(0);
}

bool CEvent::State()
{
    return running;
}

void CEvent::Apply_Surface(int x, int y, SDL_Surface * source, SDL_Surface * destination)
{
    SDL_Rect rect;
    rect.x = x;
    rect.y = y;

    SDL_BlitSurface(source, NULL, destination, &rect);
}
void CEvent::Draw_Sprite (int srcx, int srcy, int dstx, int dsty, int width, int height, SDL_Surface *source, SDL_Surface *destination)
{
    SDL_SetColorKey(source, SDL_SRCCOLORKEY, SDL_MapRGB(source->format, 255, 255, 255));

    SDL_Rect src;
    src.x = srcx;
    src.y = srcy;
    src.w = width;
    src.h = height;

    SDL_Rect dst;
    dst.x = dstx;
    dst.y = dsty;
    dst.w = width;
    dst.h = height;

    SDL_BlitSurface(source, &src, destination, &dst);
}
//This function is a work in progress - Tread with care
void CEvent::Collision(int Vertical_Axis_1, int Horizontal_Axis_1, int Vertical_Axis_2, int Horizontal_Axis_2)
{
    if(Vertical_Axis_1 >= Vertical_Axis_2 && (Vertical_Axis_1 + PLAYER_WIDTH) <= (Vertical_Axis_2 + PLAYER_WIDTH))
    {
        if(Horizontal_Axis_1 >= Horizontal_Axis_2 && (Horizontal_Axis_1 + PLAYER_HEIGHT) <= (Horizontal_Axis_2 + PLAYER_HEIGHT))
        {
            Collided = true;
        }
    }
}


//CCollisionDetection.h

#ifndef CCOLLISIONDETECTION_H
#define CCOLLISIONDETECTION_H

//Not started yet
class CCollisionDetection
{
    public:
        CCollisionDetection();
        virtual ~CCollisionDetection();
    protected:
    private:
};

#endif // CCOLLISIONDETECTION_H



//CCollisionDetection.cpp

#include "CCollisionDetection.h"

//Not Started yet
CCollisionDetection::CCollisionDetection()
{
    //ctor
}

CCollisionDetection::~CCollisionDetection()
{
    //dtor
}