FRACTALES DE JULIA ET MANDELBROT EN SDL

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/********Juste la fonction de dessin ici, le reste dans le zip**/
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void fdessinfractale(int zoom, int Xrepereinit, int Yrepereinit, double paramCx, double paramCy){
    pixel=SDL_CreateRGBSurface(SDL_HWSURFACE, 1, 1, bits, 0, 0, 0, 0);
    px=0;
    while (px<width){
    py=0;
    while (py<height){
            position.x=px;
            position.y=py;
            Xinit=0;Yinit=0;
            Xinit=(int)(Xrepereinit-(width/2));
            Yinit=(int)(Yrepereinit-(height/2));
            Xrepere=4*((px+Xinit)/((double)(zoom*width)));
            Yrepere=4*((py+Yinit)/((double)(zoom*height)));
            Zx=Xrepere;
            Zy=Yrepere;
            if(paramCx!=0&&paramCy!=0){Cx=paramCx;Cy=paramCy;}
            else{Cx=Xrepere;Cy=Yrepere;};
            n=0;
            while ( n<255 && (Zx*Zx+Zy*Zy)<=4 ){copie=Zx;
                                              Zx=Zx*Zx-Zy*Zy+Cx;
                                              Zy=2*copie*Zy+Cy;
                                              n++;
                                             };
            if(n==255&&borderonly==1){SDL_FillRect(pixel, NULL, SDL_MapRGB(pixel->format, 255, 255 , 255));}
            else{SDL_FillRect(pixel, NULL, SDL_MapRGB(pixel->format, n, n , 0));};
            SDL_BlitSurface(pixel, NULL, ecran, &position);
            py++;
                     };
    px++;
    };
SDL_Flip(ecran);
};