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#include <stdlib.h>
#include <stdio.h>
#include <tng_io.h>
int main(int argc, char **argv)
{
tng_trajectory_t traj;
union data_values ***positions = 0; // A 3-dimensional array to be populated
int64_t n_particles, n_values_per_frame, n_frames;
tng_data_type data_type;
int i, j;
int64_t particle = 0;
// Set a default frame range
int first_frame = 0, last_frame = 50;
if(argc <= 1)
{
printf("No file specified\n");
printf("Usage:\n");
printf("tng_io_read_pos <tng_file> [particle number = %"PRId64"] "
"[first_frame = %d] [last_frame = %d]\n",
particle, first_frame, last_frame);
exit(1);
}
// A reference must be passed to allocate memory
if(tng_trajectory_init(&traj) != TNG_SUCCESS)
{
tng_trajectory_destroy(&traj);
exit(1);
}
tng_input_file_set(traj, argv[1]);
// Read the file headers
tng_file_headers_read(traj, TNG_USE_HASH);
if(argc >= 3)
{
particle = strtoll(argv[2], 0, 10);
if(argc >= 4)
{
first_frame = strtoll(argv[3], 0, 10);
if(argc >= 5)
{
last_frame = strtoll(argv[4], 0, 10);
}
}
}
n_frames = last_frame - first_frame + 1;
// Get the positions of all particles in the requested frame range.
// The positions are stored in the positions array.
// N.B. No proper error checks.
if(tng_particle_data_interval_get(traj, TNG_TRAJ_POSITIONS, first_frame,
last_frame, TNG_USE_HASH, &positions, &n_particles, &n_values_per_frame,
&data_type) != TNG_SUCCESS)
{
printf("Cannot read positions\n");
}
else
{
// Print the positions of the wanted particle (zero based)
for(i=first_frame; i<=last_frame; i++)
{
printf("%d", i);
for(j=0; j<n_values_per_frame; j++)
{
switch(data_type)
{
case TNG_INT_DATA:
printf("\t%"PRId64"", positions[i][particle][j].i);
break;
case TNG_FLOAT_DATA:
printf("\t%f", positions[i][particle][j].f);
break;
case TNG_DOUBLE_DATA:
printf("\t%f", positions[i][particle][j].d);
break;
default:
break;
}
printf("\n");
}
}
}
// Free memory
if(positions)
{
tng_particle_data_values_free(positions, n_frames, n_particles,
n_values_per_frame, data_type);
}
tng_trajectory_destroy(&traj);
return(0);
}
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