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| #include <SDL/SDL.h>
int pycode(int c_1,int c_2,int c_3)
{
return c_3+c_2*256+c_1*256*256;
}
void definirPixel(SDL_Surface *surface, int x, int y, Uint32 pixel)
{
int nbOctetsParPixel = surface->format->BytesPerPixel;
Uint8 *p = (Uint8 *)surface->pixels + y * surface->pitch + x * nbOctetsParPixel;
switch(nbOctetsParPixel)
{
case 1:
*p = pixel;
break;
case 2:
*(Uint16 *)p = pixel;
break;
case 3:
if(SDL_BYTEORDER == SDL_BIG_ENDIAN)
{
p[0] = (pixel >> 16) & 0xff;
p[1] = (pixel >> 8) & 0xff;
p[2] = pixel & 0xff;
}
else
{
p[0] = pixel & 0xff;
p[1] = (pixel >> 8) & 0xff;
p[2] = (pixel >> 16) & 0xff;
}
break;
case 4:
*(Uint32 *)p = pixel;
break;
}
}
int main(int argc, char *argv[])
{
int ri=250;
int vi=0;
int bi=0;
int i;
int couleur[150];
for (i=0;i<25;i++)
{
couleur[i]=pycode(ri,vi,bi);
vi+=10;
}
for (;i<50;i++)
{
couleur[i]=pycode(ri,vi,bi);
ri-=10;
}
for (;i<75;i++)
{
couleur[i]=pycode(ri,vi,bi);
bi+=10;
}
for (;i<100;i++)
{
couleur[i]=pycode(ri,vi,bi);
vi-=10;
}
for (;i<125;i++)
{
couleur[i]=pycode(ri,vi,bi);
ri+=10;
}
for (;i<150;i++)
{
couleur[i]=pycode(ri,vi,bi);
bi-=10;
}
double xa=0,ya=0;
SDL_Surface *ecran = NULL;
SDL_Event event;
int continuer = 1;
int tempsPrecedent = 0, tempsActuel = 0;
SDL_Init(SDL_INIT_VIDEO);
ecran = SDL_SetVideoMode(600, 480, 32, SDL_HWSURFACE | SDL_DOUBLEBUF);
SDL_WM_SetCaption("Mandelbrot", NULL);
int iteration_max=150;
double zoom=200;
double eca=zoom/200;
double x1 =-1.5/eca;
double x2 =1.5/eca;
double y1 =-1.2/eca;
double y2 =1.2/eca;
int image_x = (x2 - x1) * zoom;
int image_y = (y2 - y1) * zoom;
for(int x=0;x<image_x;x++)
{
for(int y=0;y<image_y;y++)
{
double c_r = x / zoom + x1;
double c_i = y / zoom + y1;
double z_r = 0;
double z_i = 0;
int i = 0;
while(z_r*z_r + z_i*z_i <4 && i < iteration_max)
{
double tmp = z_r;
z_r = z_r*z_r - z_i*z_i + c_r;
z_i = 2*z_i*tmp + c_i;
i++;
}
if (i < iteration_max)
definirPixel(ecran,x,y,couleur[i%150]);
else
definirPixel(ecran,x,y,0);
}
}
while (continuer)
{
SDL_WaitEvent(&event);
switch(event.type)
{
case SDL_QUIT:
continuer = 0;
break;
case SDL_KEYDOWN:
switch (event.key.keysym.sym)
{
case SDLK_u:
iteration_max+=50;
break;
case SDLK_t:
SDL_SaveBMP(ecran,"mandelbrot.bmp");
break;
case SDLK_RALT:
zoom/=1.5;
break;
case SDLK_r:
zoom=200;
break;
case SDLK_LEFT:
xa-=50/zoom;
break;
case SDLK_RIGHT:
xa+=50/zoom;
break;
case SDLK_UP:
ya-=50/zoom;
break;
case SDLK_DOWN:
ya+=50/zoom;
break;
case SDLK_SPACE:
zoom*=1.5;
break;
case SDLK_BACKSPACE:
iteration_max+=20;
break;
case SDLK_e:
iteration_max-=50;
break;
}
long double eca=zoom/200;
long double x1 =xa-1.5/eca;
long double x2 =xa+1.5/eca;
long double y1 =ya-1.2/eca;
long double y2 =ya+1.2/eca;
int image_x = (x2 - x1) * zoom;
int image_y = (y2 - y1) * zoom;
for(int x=0;x<image_x;x++)
{
for(int y=0;y<image_y;y++)
{
long double c_r = x / zoom + x1,c_i = y / zoom + y1,z_r = 0,z_i = 0;
int i = 0;
while(z_r*z_r + z_i*z_i <4 && i < iteration_max)
{
long double tmp = z_r;
z_r = z_r*z_r - z_i*z_i + c_r;
z_i = 2*z_i*tmp + c_i;
i++;
}
if (i < iteration_max)
definirPixel(ecran,x,y,couleur[i%150]);
else
definirPixel(ecran,x,y,0);
}
}
}
SDL_Flip(ecran);
}
SDL_Quit();
return EXIT_SUCCESS;
} |
optimisation de code fractale mandelbrot
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