neingeist/c-exercises
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save bmp

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This commit is contained in:
neingeist 2013-05-11 16:02:40 +02:00
parent bcdea67e9a
commit 02e42d5efd
1 changed files with 10 additions and 7 deletions
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17
mandelbrot.c
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@ -18,17 +18,13 @@ int main(int argc, char *argv[]) {
int y = i / screen->w; int y = i / screen->w;
int x = i % screen->w; int x = i % screen->w;
if (x == 0) { float complex c = ((3.0 * x / screen->w) - 2.0)
printf("y = %d\n", y); + I * ((2.0 * y / screen->h) - 1.0);
}
float complex c = ((3.0 * x / screen->w) - 2.0)
+ I * ((2.0 * y / screen->h) - 1.0);
bool diverges = false; bool diverges = false;
float complex z = 0; float complex z = 0;
int it; int it;
for (it=1; it<256; it++) { for (it = 1; it < 256; it++) {
z = cpowf(z, 2) + c; z = cpowf(z, 2) + c;
if (cabs(z) > 100) { if (cabs(z) > 100) {
diverges = true; diverges = true;
@ -47,6 +43,13 @@ int main(int argc, char *argv[]) {
if (y % 10 == 0) if (y % 10 == 0)
SDL_Flip(screen); SDL_Flip(screen);
} }
/* Save BMP */
char *file = "mandelbrot.bmp";
if (SDL_SaveBMP(screen, file) != 0) {
fprintf(stderr, "Could not write %s!\n", file);
}
if (SDL_MUSTLOCK(screen)) { if (SDL_MUSTLOCK(screen)) {
SDL_UnlockSurface(screen); SDL_UnlockSurface(screen);
} }