Game Developers

struct
{
    int index;
    int lasttime;
    int delay;
    SDL_Surface* image;
    int width;
    int offset;
    int margin;
} typedef Animation;

Animation* createAnimation(SDL_Surface* image, int width, int offset, int margin);
void freeAnimation(Animation* anim);

Animation* createAnimation(SDL_Surface* image, int width, int offset, int margin)
{
    Animation* anim = malloc(sizeof(Animation));
    anim->image = image;
    anim->width = width;
    anim->offset = offset;
    anim->margin = margin;
    anim->delay = 200;
    return anim;
}
 
void freeAnimation(Animation* anim)
{
    free(anim);
}

void setAnimationSpeed(Animation* anim, unsigned int speed);
void drawAnimation(Animation* anim, SDL_Surface* screen, SDL_Rect* position);

void setAnimationSpeed(Animation* anim, unsigned int speed)
{
    if(speed > 0)
        anim->delay = 1.f/speed*1000.f;
}
 
void drawAnimation(Animation* anim, SDL_Surface* screen, SDL_Rect* position)
{
    if(SDL_GetTicks() - anim->lasttime >= anim->delay)
    {
        anim->lasttime = SDL_GetTicks();
        anim->index++;
        if(anim->offset + anim->offset*anim->index + anim->width*anim->index >= anim->image->w)
            anim->index = 0;
    }
    SDL_Rect rect;
    rect.w = anim->width;
    rect.h = anim->image->h;
    rect.x = anim->offset + anim->index * anim->width + anim->index * anim->margin;
    rect.y = 0;
    SDL_BlitSurface(anim->image, &rect, screen, position);
}

#include <stdlib.h>
#include <stdio.h>
#include <SDL/SDL.h>
#include "Animation.h"
 
int main(int argc, char** argv)
{
    SDL_Init(SDL_INIT_VIDEO);
 
    SDL_Surface* screen = SDL_SetVideoMode(640, 480, 32, SDL_HWSURFACE);
    SDL_WM_SetCaption("Animation avec SDL", 0);
 
    SDL_FillRect(screen, 0, SDL_MapRGB(screen->format, 200, 200, 240));
    SDL_Flip(screen);
 
    SDL_Surface* narutoStrip = SDL_LoadBMP("naruto_run.bmp");
    SDL_SetColorKey(narutoStrip, SDL_SRCCOLORKEY, SDL_MapRGB(narutoStrip->format, 0, 255, 0));
    SDL_Surface* soldierStrip = SDL_LoadBMP("soldier_run.bmp");
    SDL_SetColorKey(soldierStrip, SDL_SRCCOLORKEY, SDL_MapRGB(soldierStrip->format, 0, 0, 255));
 
    Animation* narutoAnim = createAnimation(narutoStrip, 54, 2, 2);
    setAnimationSpeed(narutoAnim, 10);
    Animation* soldierAnim = createAnimation(soldierStrip, 70, 2, 1);
    setAnimationSpeed(soldierAnim, 10);
 
    int continuer = 1;
    SDL_Event event;
 
    SDL_Rect pos;
    pos.x = 8;
 
    while (continuer)
    {
        SDL_PollEvent(&event);
 
        switch(event.type)
        {
            case SDL_QUIT:
                continuer = 0;
            break;
        }
        SDL_FillRect(screen, 0, SDL_MapRGB(screen->format, 200, 200, 240));
        pos.y = 64;
        SDL_BlitSurface(narutoStrip, 0, screen, &pos);
        pos.y = 128;
        drawAnimation(narutoAnim, screen, &pos);
        pos.y = 192;
        SDL_BlitSurface(soldierStrip, 0, screen, &pos);
        pos.y = 256;
        drawAnimation(soldierAnim, screen, &pos);
        SDL_Flip(screen);
        SDL_Delay(8);
    }
 
    freeAnimation(narutoAnim);
    freeAnimation(soldierAnim);
 
    SDL_Quit();
 
    return 0;
}