#include <SDL/SDL.h>

int main()
{
        int i,j,quit=0;
        SDL_Surface *screen;
        SDL_Surface *box;
        SDL_Surface *box2;
        SDL_Surface *background;
        SDL_Event event;
        SDL_Rect offset;
        SDL_Rect offset2;
        SDL_Init(SDL_INIT_EVERYTHING); // creates a surface for the image
        screen=SDL_SetVideoMode(640,480,32,SDL_SWSURFACE);
        background=IMG_Load("background.bmp"); //renders the image
        box=IMG_Load("box.bmp");//loads the image saved in this file and attaches it to box
        box2=IMG_Load("box2.bmp");
        offset2.x=0; // sets offset2 starting position to (0,0)
        offset2.y=0;
        while(quit==0)
        {
                SDL_BlitSurface(background, NULL, screen, NULL);
                if(SDL_PollEvent(&event))
                {
                        if(event.type==SDL_KEYDOWN) // . is a structure??
                        {
                                switch(event.key.keysym.sym)
                                {
                                        case SDLK_ESCAPE: // escape key is being set to quit the program
                                                quit=1;
                                                break;
                                        case SDLK_RETURN:
                                                offset.x=320;
                                                offset.y=240;
                                                offset.w=box->w;
                                                offset.h=box->h;
                                                break;
                                        case SDLK_UP:// up key can be replaced by lower case w capital W means you have to hold shift down every time you hit w.
                                                offset.y=offset.y-10;
                                                break; // with programming screens 0,0 is the top right corner of the screen not center like math class.
                                        case SDLK_DOWN:
                                                offset.y=offset.y+10;
                                                break;
                                        case SDLK_RIGHT:
                                                offset.x=offset.x+10;
                                                break;
                                        case SDLK_LEFT:
                                                offset.x=offset.x-10;
                                                break;
                                }
                        }
                        else if(event.type == SDL_QUIT)
                                quit = 1;
                }
                if(offset2.x <= 0)
                i=10;
                else if(offset2.x >=640)
                i=-10;
                if(offset2.y <= 0)
                j=10;
                else if(offset2.y  >=480)
                j=-10;
                offset2.x +=i; //offset2 is a box that moves on its own bouncing around on the walls.
                offset2.y +=j;
                SDL_BlitSurface(box2,NULL,screen,&offset2);
                SDL_BlitSurface(box,NULL,screen,&offset);
                SDL_Flip(screen);
                SDL_Delay(10);
        }
        return(0);
}