int main(int argc, char* argv[])
{
double tx, ty, tz;
double volume;
int successes=0, attempts=0;
setCommandLineParameters(argc, argv);
if (getFlagParam("-usage"))
{
printf("usage: cv [ -randomize ]\n\n");
printf(" will return MC volume of list of spheres entered, box size determined automatically.\n");
printf("\n");
printf("// Reads a centered cluster and determines the volume of it.\n");
printf("// Will deliver an erroneous result if cluster is not centered or percolates.\n");
printf("\n");
printf("// More generally, it will give the volume of all the cavities, whether clustered or not.\n");
printf("\n");
printf("// In: one cluster; 1 or more records in .cav format \n");
printf("// Out: .dst (reports one value of volume) \n");
exit(1);
}
if (getFlagParam("-randomize")) initializeRandomNumberGenerator2(-1);
else initializeRandomNumberGenerator2(0);
instream = stdin;
readInputStream();
findMinimumBoxSize();
successes=0;
for (attempts=0; successes<N_SUCCESSES; attempts++)
{
// pick a point and check inclusion
tx = rnd2() * box_x;
ty = rnd2() * box_y;
tz = rnd2() * box_z;
successes += checkInclusion(tx, ty, tz);
if (attempts > 100000000)
{
printf("too many attempts.");
exit(1);
}
}
volume = (box_x * box_y * box_z * successes)/attempts;
printf("%lf\n", volume);
return 0;
}
int RandomBuf::readFromDevice(char* buffer, std::streamsize length)
{
int n = 0;
#if defined(POCO_OS_FAMILY_WINDOWS)
HCRYPTPROV hProvider = 0;
CryptAcquireContext(&hProvider, 0, 0, PROV_RSA_FULL, CRYPT_VERIFYCONTEXT);
CryptGenRandom(hProvider, (DWORD) length, (BYTE*) buffer);
CryptReleaseContext(hProvider, 0);
n = static_cast<int>(length);
#else
#if defined(POCO_OS_FAMILY_UNIX)
int fd = open("/dev/urandom", O_RDONLY, 0);
if (fd >= 0)
{
n = read(fd, buffer, length);
close(fd);
}
#endif
if (n <= 0)
{
// x is here as a source of randomness, so it does not make
// much sense to protect it with a Mutex.
static UInt32 x = 0;
Random rnd1(256);
Random rnd2(64);
x += rnd1.next();
n = 0;
SHA1Engine engine;
UInt32 t = (UInt32) std::time(NULL);
engine.update(&t, sizeof(t));
void* p = this;
engine.update(&p, sizeof(p));
engine.update(buffer, length);
UInt32 junk[32];
engine.update(junk, sizeof(junk));
while (n < length)
{
for (int i = 0; i < 100; ++i)
{
UInt32 r = rnd2.next();
engine.update(&r, sizeof(r));
engine.update(&x, sizeof(x));
x += rnd1.next();
}
DigestEngine::Digest d = engine.digest();
for (DigestEngine::Digest::const_iterator it = d.begin(); it != d.end() && n < length; ++it, ++n)
{
engine.update(*it);
*buffer++ = *it++;
}
}
}
#endif
return n;
}
int main(int argc, char* argv[])
{
double surface_area;
int successes=0, attempts=0;
int particle_number;
instream=stdin;
setCommandLineParameters(argc, argv);
getVectorParam("-box", &box_x, &box_y, &box_z);
if (getFlagParam("-randomize")) initializeRandomNumberGenerator2(-1);
else initializeRandomNumberGenerator2(0);
readInputStream();
// figure out total surface area for sampling
for (particle_number=0; particle_number<number_of_cavities; particle_number++)
{
sorface_area[particle_number] = PI * d[particle_number] * d[particle_number];
total_surface_area += sorface_area[particle_number];
}
for (attempts=0; attempts<N_SAMPLES; attempts++)
{
// pick a particle, then pick a point on its surface
while(1)
{
particle_number = rnd2() * number_of_cavities;
if (rnd2() < (sorface_area[particle_number]/total_surface_area)) break;
}
generateSamplePoint(particle_number);
successes += checkExclusion();
}
// volume = (box_x * box_y * box_z * successes)/attempts;
surface_area = (total_surface_area * successes)/attempts;
printf("%lf\n", surface_area);
return 0;
}
void generateSamplePoint(int particle_number)
{
double sin_theta, cos_theta, sin_phi, cos_phi;
double radius;
sample_theta = 0;
while (rnd2() >= (sin_theta = sin(sample_theta))) sample_theta = rnd2() * PI;
sample_phi = rnd2() * 2 * PI;
cos_theta = cos(sample_theta);
sin_phi = sin(sample_phi);
cos_phi = cos(sample_phi);
radius = d[particle_number] * .5;
sample_x = x[particle_number] + radius * sin_theta * cos_phi;
sample_y = y[particle_number] + radius * sin_theta * sin_phi;
sample_z = z[particle_number] + radius * cos_theta;
printf("%lf\t%lf\t%lf\t%lf\t1\n", sample_x, sample_y, sample_z, .1);
}
int main(int argc, char* argv[])
{
double tx, ty, tz;
double volume;
int successes=0, attempts=0;
setCommandLineParameters(argc, argv);
getVectorParam("-box", &box_x, &box_y, &box_z);
if (getFlagParam("-randomize")) initializeRandomNumberGenerator2(-1);
else initializeRandomNumberGenerator2(0);
readInputStream();
successes=0;
for (attempts=0; successes<N_SUCCESSES; attempts++)
{
// pick a point and check inclusion
tx = rnd2() * box_x;
ty = rnd2() * box_y;
tz = rnd2() * box_z;
successes += checkInclusion(tx, ty, tz);
if (attempts > 100000000)
{
printf("too many attempts.");
exit(1);
}
}
volume = (box_x * box_y * box_z * successes)/attempts;
printf("%lf\n", volume);
return 0;
}