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/* -*- Mode: C; indent-tabs-mode: nil; c-basic-offset: 4 c-style: "K&R" -*- */
/*
libgpiv - library for Particle Image Velocimetry
Copyright (C) 2007, 2008 Gerber van der Graaf
This file is part of libgpiv.
Libgpiv is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software Foundation,
Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
-------------------------------------------------------------------------------
FILENAME: utils.c
LIBRARY: libgpiv:
EXTERNAL FUNCTIONS:
gpiv_null_scdata
gpiv_alloc_scdata
gpiv_free_scdata
gpiv_null_bindata
gpiv_alloc_bindata
gpiv_free_bindata
LAST MODIFICATION DATE: $Id: post_utils.c,v 1.2 2007-12-19 08:46:46 gerber Exp $
--------------------------------------------------------------------------- */
#include <gpiv.h>
void
gpiv_null_scdata (GpivScalarData *scal_data
)
/*-----------------------------------------------------------------------------
* DESCRIPTION:
* Sets all elements of scal_data structure to NULL
*---------------------------------------------------------------------------*/
{
scal_data->point_x = NULL;
scal_data->point_y = NULL;
scal_data->scalar = NULL;
scal_data->flag = NULL;
}
GpivScalarData *
gpiv_alloc_scdata (const gint nx,
const gint ny
)
/*-----------------------------------------------------------------------------
* DESCRIPTION:
* Allocates memory for GpivScalarData
*
* INPUTS:
* scal_data: .nx and .ny members of GpivScalarData structure
*
* OUTPUTS:
* scal_data: point_x, point_y, scalar, flag of GpivScalarData
*
* RETURNS:
*---------------------------------------------------------------------------*/
{
GpivScalarData *scal_data = g_new0 (GpivScalarData, 1);
gint i, j;
if (ny <= 0 || nx <= 0) {
gpiv_warning ("gpiv_alloc_scdata: nx = %d ny = %d",
nx, ny);
return NULL;
}
scal_data->nx = nx;
scal_data->ny = ny;
scal_data->point_x = gpiv_matrix (scal_data->ny, scal_data->nx);
scal_data->point_y = gpiv_matrix (scal_data->ny, scal_data->nx);
scal_data->scalar = gpiv_matrix (scal_data->ny, scal_data->nx);
scal_data->flag = gpiv_imatrix (scal_data->ny, scal_data->nx);
for (i = 0; i < scal_data->ny; i++) {
for (j = 0; j < scal_data->nx; j++) {
scal_data->point_x[i][j] = 0.0;
scal_data->point_y[i][j] = 0.0;
scal_data->scalar[i][j] = 0.0;
scal_data->flag[i][j] = 0;
}
}
scal_data->scale = FALSE;
scal_data->scale__set = FALSE;
scal_data->comment = NULL;
return scal_data;
}
void
gpiv_free_scdata (GpivScalarData *scal_data
)
/*-----------------------------------------------------------------------------
* DESCRIPTION:
* Frees memory for GpivScalarData
*
* INPUTS:
* scal_data: scalar data structure
*
* OUTPUTS:
* scal_data: NULL pointer to point_x, point_y, scalar, flag
*
* RETURNS:
*---------------------------------------------------------------------------*/
{
g_return_if_fail (scal_data->point_x != NULL); /* gpiv_error ("scal_data->point_x not allocated"); */
g_return_if_fail (scal_data->point_y != NULL); /* gpiv_error ("scal_data->point_y not allocated"); */
g_return_if_fail (scal_data->scalar != NULL); /* gpiv_error ("scal_data->scalar not allocated"); */
g_return_if_fail (scal_data->flag != NULL); /* gpiv_error ("scal_data->flag not allocated"); */
gpiv_free_matrix (scal_data->point_x);
gpiv_free_matrix (scal_data->point_y);
gpiv_free_matrix (scal_data->scalar);
gpiv_free_imatrix (scal_data->flag);
g_free (scal_data->comment);
gpiv_null_scdata (scal_data);
}
gchar *
gpiv_scalar_gnuplot (const gchar * fname_out,
const gchar *title,
const gchar *GNUPLOT_DISPLAY_COLOR,
const gint GNUPLOT_DISPLAY_SIZE
)
/*-----------------------------------------------------------------------------
* DESCRIPTION:
* Graphical output with gnuplot for scalar data
*
* INPUTS:
* fname_out: file name containing plot
* title: title of plot
* GNUPLOT_DISPLAY_COLOR: display color of window containing graph
* GNUPLOT_DISPLAY_SIZE: display size of window containing graph
*
* OUTPUTS:
*
* RETURNS:
* NULL on success or *err_msg on failure
*---------------------------------------------------------------------------*/
{
gchar *err_msg = NULL;
FILE *fp_cmd;
const gchar *tmp_dir = g_get_tmp_dir ();
gchar *fname_loc = "gpiv_gnuplot.cmd";
gchar fname_cmd[GPIV_MAX_CHARS];
gchar command[GPIV_MAX_CHARS];
snprintf (fname_cmd, GPIV_MAX_CHARS, "%s/%s", tmp_dir, fname_loc);
if ((fp_cmd = fopen (fname_cmd, "w")) == NULL) {
err_msg = "gpiv_scalar_gnuplot: Failure opening %s for output";
gpiv_warning ("%s", err_msg);
return err_msg;
}
fprintf (fp_cmd, "set xlabel \"x (pixels)\"");
fprintf (fp_cmd, "\nset ylabel \"y (pixels)\"");
fprintf (fp_cmd, "\nset contour; set nosurface");
fprintf (fp_cmd, "\nset view 0, 0");
fprintf (fp_cmd,
"\nsplot \"%s\" title \"%s\" with lines",
fname_out, title);
fprintf (fp_cmd, "\npause -1 \"Hit return to exit\"");
fprintf (fp_cmd, "\nquit");
fclose (fp_cmd);
snprintf (command, GPIV_MAX_CHARS, "gnuplot -bg %s -geometry %dx%d %s",
GNUPLOT_DISPLAY_COLOR, GNUPLOT_DISPLAY_SIZE,
GNUPLOT_DISPLAY_SIZE, fname_cmd);
if (system (command) != 0) {
err_msg = "gpiv_scalar_gnuplot: could not exec shell command";
gpiv_warning ("%s", err_msg);
return err_msg;
}
return err_msg;
}
void
gpiv_null_bindata (GpivBinData *bin_data
)
/*-----------------------------------------------------------------------------
* DESCRIPTION:
* Sets all elements of bin_data structure to NULL
*
* INPUTS:
* bin_data: Input Bin data structure
*
* OUTPUTS:
* bin_data: Output Bin data structure
*
* RETURNS:
*---------------------------------------------------------------------------*/
{
bin_data->count = NULL;
bin_data->bound = NULL;
bin_data->centre = NULL;
}
GpivBinData *
gpiv_alloc_bindata (const guint nbins
)
/*-----------------------------------------------------------------------------
* DESCRIPTION:
* Allocates memory for GpivScalarData
*
* INPUTS:
* bin_data: nbins of GpivScalarData
*
* OUTPUTS:
* bin_data: count, bound, centre of GpivScalarData
*
* RETURNS:
*---------------------------------------------------------------------------*/
{
GpivBinData *bin_data = g_new0 (GpivBinData, 1);
gint i;
if (nbins == 0) {
gpiv_warning ("GPIV_ALLOC_BINDATA: nbins = %d", nbins);
return NULL;
}
bin_data->nbins = nbins;
/* BUGFIX */
/* g_warning("gpiv_alloc_bindata:: 4/4 nbins = %d", bin_data->nbins); */
bin_data->count = gpiv_ivector (bin_data->nbins);
bin_data->bound = gpiv_vector (bin_data->nbins);
bin_data->centre = gpiv_vector (bin_data->nbins);
for (i = 0; i < bin_data->nbins; i++) {
bin_data->count[i] = 0;
bin_data->bound[i] = 0.0;
bin_data->centre[i] = 0.0;
}
bin_data->min = 914.6e9;
bin_data->max = -914.6e9;
bin_data->comment = NULL;
return bin_data;
}
void
gpiv_free_bindata (GpivBinData *bin_data
)
/*-----------------------------------------------------------------------------
* DESCRIPTION:
* Frees memory for GpivScalarData
*
* INPUTS:
* bin_data: data of bins
*
* OUTPUTS:
* bin_data: NULL pointer to count, bound, centre
*
* RETURNS:
*---------------------------------------------------------------------------*/
{
g_return_if_fail (bin_data->count != NULL); /* gpiv_error ("bin_data->count not allocated"); */
g_return_if_fail (bin_data->bound != NULL); /* gpiv_error ("bin_data->bound not allocated"); */
g_return_if_fail (bin_data->centre != NULL); /* gpiv_error ("bin_data->centre not allocated"); */
/* g_warning ("gpiv_free_bindata:: 0 nbins = %d", bin_data->nbins); */
gpiv_free_ivector (bin_data->count);
gpiv_free_vector (bin_data->centre);
gpiv_free_vector (bin_data->bound);
bin_data->bound = NULL;
bin_data->centre = NULL;
bin_data->count = NULL;
}
void
gpiv_histo (const GpivPivData *data,
GpivBinData *klass
)
/*-----------------------------------------------------------------------------
* DESCRIPTION:
* Calculates histogram from GpivPivData (NOT from ScalarData!!)
*
* INPUTS:
* data: Input data
*
* OUTPUTS:
* klass: Output data
*
* RETURNS:
*---------------------------------------------------------------------------*/
{
gint i, j, k;
gint nx = data->nx, ny = data->ny, **peak_no = data->peak_no;
float **snr = data->snr;
float delta;
float *bound = klass->bound, *centre = klass->centre;
gint *count = klass->count, nbins = klass->nbins;
g_return_if_fail (data->point_x != NULL); /* gpiv_error ("data->point_x not allocated"); */
g_return_if_fail (data->point_y != NULL); /* gpiv_error ("data->point_y not allocated"); */
g_return_if_fail (data->dx != NULL); /* gpiv_error ("data->dx not allocated"); */
g_return_if_fail (data->dy != NULL); /* gpiv_error ("data->dy not allocated"); */
g_return_if_fail (data->snr != NULL); /* gpiv_error ("data->snr not allocated"); */
g_return_if_fail (data->peak_no != NULL); /* gpiv_error ("ata->peak_no not allocated"); */
g_return_if_fail (klass->count != NULL); /* gpiv_error ("klass->count not allocated"); */
g_return_if_fail (klass->bound != NULL); /* gpiv_error ("klass->bound not allocated"); */
g_return_if_fail (klass->centre != NULL); /* gpiv_error ("klass->centre not allocated"); */
klass->min = 10.0e+9, klass->max = -10.0e+9;
/*
* find min and max value
*/
for (i = 0; i < ny; i++) {
for (j = 0; j < nx; j++) {
if (peak_no[i][j] != -1) {
if (snr[i][j] < klass->min)
klass->min = snr[i][j];
if (snr[i][j] >= klass->max)
klass->max = snr[i][j];
}
}
}
/*
* Calculating boundaries of bins
*/
delta = (klass->max - klass->min) / nbins;
for (i = 0; i < nbins; i++) {
centre[i] = klass->min + delta / 2.0 + (float) i *delta;
count[i] = 0;
}
for (i = 0; i < nbins; i++) {
bound[i] = klass->min + (float) i * delta;
}
/*
* Sorting of snr data in bins
*/
for (i = 0; i < ny; i++) {
for (j = 0; j < nx; j++) {
if (peak_no[i][j] != -1) {
for (k = 0; k < nbins; k++) {
if ((snr[i][j] > bound[k])
&& (snr[i][j] <= bound[k] + delta)) {
count[k] = count[k] + 1;
}
}
}
}
}
}
void
gpiv_cumhisto (const GpivPivData *data,
GpivBinData *klass
)
/*-----------------------------------------------------------------------------
* DESCRIPTION:
* Calculates cumulative histogram from GpivPivData (NOT from ScalarData!!)
*
* INPUTS:
* data: Input data
*
* OUTPUTS:
* klass: Output data
*
* RETURNS:
*---------------------------------------------------------------------------*/
{
gint i, j, k;
gint nx = data->nx, ny = data->ny, **peak_no = data->peak_no;
float **snr = data->snr;
float delta;
float *bound = klass->bound, *centre = klass->centre;
gint *count = klass->count, nbins = klass->nbins;
g_return_if_fail (data->point_x != NULL); /* gpiv_error ("data->point_x not allocated"); */
g_return_if_fail (data->point_y != NULL); /* gpiv_error ("data->point_y not allocated"); */
g_return_if_fail (data->dx != NULL); /* gpiv_error ("data->dx not allocated"); */
g_return_if_fail (data->dy != NULL); /* gpiv_error ("data->dy not allocated"); */
g_return_if_fail (data->snr != NULL); /* gpiv_error ("data->snr not allocated"); */
g_return_if_fail (data->peak_no != NULL); /* gpiv_error ("ata->peak_no not allocated"); */
g_return_if_fail (klass->count != NULL); /* gpiv_error ("klass->count not allocated"); */
g_return_if_fail (klass->bound != NULL); /* gpiv_error ("klass->bound not allocated"); */
g_return_if_fail (klass->centre != NULL); /* gpiv_error ("klass->centre not allocated"); */
klass->min = 10e+9, klass->max = -10e+9;
/*
* find min and max value
*/
for (i = 0; i < ny; i++) {
for (j = 0; j < nx; j++) {
if (peak_no[i][j] != -1) {
if (snr[i][j] < klass->min)
klass->min = snr[i][j];
if (snr[i][j] >= klass->max)
klass->max = snr[i][j];
}
}
}
/*
* Calculating boundaries of bins
*/
delta = (klass->max - klass->min) / nbins;
for (i = 0; i < nbins; i++) {
centre[i] = klass->min + delta / 2.0 + (float) i *delta;
count[i] = 0;
}
for (i = 0; i < nbins; i++) {
bound[i] = klass->min + (float) i * delta;
}
/*
* Sorting of snr data in bins
*/
for (i = 0; i < ny; i++) {
for (j = 0; j < nx; j++) {
if (peak_no[i][j] != -1) {
for (k = 0; k < nbins; k++) {
if (snr[i][j] <= bound[k] + delta) {
count[k] = count[k] + 1;
}
}
}
}
}
}
gchar *
gpiv_histo_gnuplot (const gchar *fname_out,
const gchar *title,
const gchar *GNUPLOT_DISPLAY_COLOR,
const gint GNUPLOT_DISPLAY_SIZE
)
/*-----------------------------------------------------------------------------
* DESCRIPTION:
* Plots histogram on screen with gnuplot
*
* INPUTS:
* fname_out: output filename
* title: plot title
* GNUPLOT_DISPLAY_COLOR: display color of window containing graph
* GNUPLOT_DISPLAY_SIZE: display size of window containing graph
*
* OUTPUTS:
*
* RETURNS:
* NULL on success or *err_msg on failure
*---------------------------------------------------------------------------*/
{
gchar *err_msg = NULL;
FILE *fp_cmd;
const gchar *tmp_dir = g_get_tmp_dir ();
gchar *fname_loc = "gpiv_gnuplot.cmd";
gchar *function_name = "gpiv_histo_gnuplot";
gchar fname_cmd[GPIV_MAX_CHARS];
gchar command[GPIV_MAX_CHARS];
snprintf (fname_cmd, GPIV_MAX_CHARS, "%s/%s", tmp_dir, fname_loc);
if ((fp_cmd = fopen (fname_cmd,"w")) == NULL) {
err_msg = "GPIV_HISTO_GNUPLOT: Failure opening for output";
gpiv_warning ("%s", err_msg);
return err_msg;
}
fprintf (fp_cmd, "set xlabel \"residu (pixels)\"");
fprintf (fp_cmd, "\nset ylabel \"frequency\"");
fprintf (fp_cmd, "\nplot \"%s\" title \"%s\" with boxes",
fname_out, title);
fprintf (fp_cmd, "\npause -1 \"Hit return to exit\"");
fprintf (fp_cmd, "\nquit");
fclose (fp_cmd);
snprintf (command, GPIV_MAX_CHARS, "gnuplot -bg %s -geometry %dx%d %s",
GNUPLOT_DISPLAY_COLOR, GNUPLOT_DISPLAY_SIZE,
GNUPLOT_DISPLAY_SIZE, fname_cmd);
if (system (command) != 0) {
g_warning ("%s:%s could not exec shell command",
LIBNAME, function_name);
exit (1);
}
return err_msg;
}
|
