josch/mandelbrot
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first working version

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josch 2013-06-27 03:34:56 +02:00
parent b62cc297cf
commit 0e9cee9223
2 changed files with 36 additions and 7 deletions
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25
mandel_mpfr.c
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@ -14,7 +14,7 @@ int main(int argc, char **argv) {
mpfr_t temp1, temp2;
mpfr_init2(temp1, 300);
mpfr_init2(temp2, 300);
//long double eps = 1e-17;
long double eps = 1e-17;
mpfr_t Q1LOG2, LOG2;
mpfr_init_set_str(Q1LOG2, "1.44269504088896340735992468100189213742664595415299", 10, MPFR_RNDN);
mpfr_init_set_str(LOG2, "0.69314718055994530941723212145817656807550013436026", 10, MPFR_RNDN);
@ -23,8 +23,18 @@ int main(int argc, char **argv) {
char* image = malloc(width*height*3);
unsigned int x, y;
mpfr_t centerx, centery;
mpfr_init_set_str(centerx, argv[3], 10, MPFR_RNDN);
mpfr_init_set_str(centery, argv[4], 10, MPFR_RNDN);
mpfr_init2(centerx, 300);
mpfr_init2(centery, 300);
mpfr_set_str(centerx, argv[3], 10, MPFR_RNDN);
mpfr_set_str(centery, argv[4], 10, MPFR_RNDN);
/*mpfr_set_d(centerx, -0.7436438870371587, MPFR_RNDN);
mpfr_add_d(centerx, centerx, -3.628952515063387E-17, MPFR_RNDN);
mpfr_set_d(centery, 0.13182590420531198, MPFR_RNDN);
mpfr_add_d(centery, centery, -1.2892807754956678E-17, MPFR_RNDN);
mpfr_out_str(stderr, 10, 0, centerx, MPFR_RNDN);
fputs("\n", stderr);
mpfr_out_str(stderr, 10, 0, centery, MPFR_RNDN);
fputs("\n", stderr);*/
double bailout = 4; // the distance must not be greater than 2 (4 = 2*2)
mpfr_t logLogBailout;
mpfr_init2(logLogBailout, 300);
@ -89,11 +99,12 @@ int main(int argc, char **argv) {
mpfr_set(zy, py, MPFR_RNDN);
unsigned long i;
bool inside = true;
/*int check = 3;
int whenupdate = 10;*/
int check = 3;
int whenupdate = 10;
mpfr_set_d(hx, 0, MPFR_RNDN);
mpfr_set_d(hy, 0, MPFR_RNDN);
for (i = 1; i <= maxiter; i++) {
//for (i = 1; i <= 50000; i++) {
//xx = zx * zx;
mpfr_mul(xx, zx, zx, MPFR_RNDN);
//yy = zy * zy;
@ -115,7 +126,7 @@ int main(int argc, char **argv) {
// period checking
// d = zx - hx;
/*mpfr_sub(d, zx, hx, MPFR_RNDN);
mpfr_sub(d, zx, hx, MPFR_RNDN);
mpfr_abs(d, d, MPFR_RNDN);
if (mpfr_cmp_d(d, eps) < 0) {
// d = zy - hy;
@ -136,7 +147,7 @@ int main(int argc, char **argv) {
// period = 0;
mpfr_set(hx, zx, MPFR_RNDN);
mpfr_set(hy, zy, MPFR_RNDN);
}*/
}
}
if (inside) {

18
run.sh Executable file
View file

@ -0,0 +1,18 @@
#!/bin/sh
start="1.0"
end="1.0e+32"
frames="100"
magn=`python -c "from math import pow; fac = pow($end / $start, 1.0 / ($frames - 1)); print \"\\n\".join([ str($start * pow(fac, i-1)) for i in range(1, $frames + 1)])"`
centerx="-0.743643887037158704752191506114774"
centery="0.131825904205311970493132056385139"
i=0
for mag in $magn; do
echo $mag
fname=`printf "out_%04d_%s.ppm" $i $mag`
./a.out 320 240 $centerx $centery $mag > "$fname"
i=$((i+1))
done