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/*
* @(#) $Id: gradient.c 9055 2009-03-11 10:06:09Z yeti-dn $
* Copyright (C) 2003 David Necas (Yeti), Petr Klapetek.
* E-mail: yeti@gwyddion.net, klapetek@gwyddion.net.
*
* This program 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 of the License, 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 USA
*/
#include "config.h"
#include <string.h>
#include <gtk/gtk.h>
#include <libgwyddion/gwymacros.h>
#include <libgwyddion/gwymath.h>
#include <libprocess/filters.h>
#include <libprocess/stats.h>
#include <libgwydgets/gwystock.h>
#include <libgwymodule/gwymodule-process.h>
#include <app/gwyapp.h>
#define GRADIENT_RUN_MODES GWY_RUN_IMMEDIATE
static gboolean module_register(void);
static void gradient (GwyContainer *data,
GwyRunType run,
const gchar *name);
static GwyModuleInfo module_info = {
GWY_MODULE_ABI_VERSION,
&module_register,
N_("Creates presentations with various gradients "
"(Sobel, Prewitt)."),
"Petr Klapetek <klapetek@gwyddion.net>",
"1.5",
"David Nečas (Yeti) & Petr Klapetek",
"2004",
};
GWY_MODULE_QUERY(module_info)
static gboolean
module_register(void)
{
gwy_process_func_register("sobel_horizontal",
(GwyProcessFunc)&gradient,
N_("/_Presentation/_Gradient/_Sobel (horizontal)"),
NULL,
GRADIENT_RUN_MODES,
GWY_MENU_FLAG_DATA,
N_("Horizontal Sobel gradient presentation"));
gwy_process_func_register("sobel_vertical",
(GwyProcessFunc)&gradient,
N_("/_Presentation/_Gradient/_Sobel (vertical)"),
NULL,
GRADIENT_RUN_MODES,
GWY_MENU_FLAG_DATA,
N_("Vertical Sobel gradient presentation"));
gwy_process_func_register("prewitt_horizontal",
(GwyProcessFunc)&gradient,
N_("/_Presentation/_Gradient/_Prewitt (horizontal)"),
NULL,
GRADIENT_RUN_MODES,
GWY_MENU_FLAG_DATA,
N_("Horizontal Prewitt gradient presentation"));
gwy_process_func_register("prewitt_vertical",
(GwyProcessFunc)&gradient,
N_("/_Presentation/_Gradient/_Prewitt (vertical)"),
NULL,
GRADIENT_RUN_MODES,
GWY_MENU_FLAG_DATA,
N_("Vertical Prewitt gradient presentation"));
gwy_process_func_register("azimuth",
(GwyProcessFunc)&gradient,
N_("/_Presentation/_Gradient/_Azimuth"),
NULL,
GRADIENT_RUN_MODES,
GWY_MENU_FLAG_DATA,
N_("Local slope azimuth presentation"));
return TRUE;
}
static void
filter_azimuth(GwyDataField *dfield, GwyDataField *target)
{
const gdouble *sdata;
gdouble *data;
gint xres, yres, i, j;
sdata = gwy_data_field_get_data_const(dfield);
data = gwy_data_field_get_data(target);
xres = gwy_data_field_get_xres(target);
yres = gwy_data_field_get_yres(target);
for (j = 0; j < xres; j++)
data[j] = 0.0;
for (i = 1; i < yres-1; i++) {
data[i*xres] = 0.0;
for (j = 1; j < xres-1; j++) {
gdouble xd = sdata[i*xres + j+1] - sdata[i*xres + j-1];
gdouble yd = sdata[(i+1)*xres + j] - sdata[(i-1)*xres + j];
data[i*xres + j] = atan2(yd, xd);
}
data[i*xres + xres-1] = 0.0;
}
for (j = 0; j < xres; j++)
data[(yres - 1)*xres + j] = 0.0;
}
static void
gradient(GwyContainer *data,
GwyRunType run,
const gchar *name)
{
GwyDataField *dfield, *showfield;
GQuark dquark, squark;
GwySIUnit *siunit;
gint id;
g_return_if_fail(run & GRADIENT_RUN_MODES);
gwy_app_data_browser_get_current(GWY_APP_DATA_FIELD_KEY, &dquark,
GWY_APP_DATA_FIELD, &dfield,
GWY_APP_DATA_FIELD_ID, &id,
GWY_APP_SHOW_FIELD_KEY, &squark,
GWY_APP_SHOW_FIELD, &showfield,
0);
g_return_if_fail(dfield && dquark && squark);
gwy_app_undo_qcheckpointv(data, 1, &squark);
if (!showfield) {
showfield = gwy_data_field_new_alike(dfield, FALSE);
siunit = gwy_si_unit_new("");
gwy_data_field_set_si_unit_z(showfield, siunit);
g_object_unref(siunit);
gwy_container_set_object(data, squark, showfield);
g_object_unref(showfield);
}
gwy_data_field_copy(dfield, showfield, FALSE);
if (gwy_strequal(name, "sobel_horizontal"))
gwy_data_field_filter_sobel(showfield, GWY_ORIENTATION_HORIZONTAL);
else if (gwy_strequal(name, "sobel_vertical"))
gwy_data_field_filter_sobel(showfield, GWY_ORIENTATION_VERTICAL);
else if (gwy_strequal(name, "prewitt_horizontal"))
gwy_data_field_filter_prewitt(showfield, GWY_ORIENTATION_HORIZONTAL);
else if (gwy_strequal(name, "prewitt_vertical"))
gwy_data_field_filter_prewitt(showfield, GWY_ORIENTATION_VERTICAL);
else if (gwy_strequal(name, "azimuth"))
filter_azimuth(dfield, showfield);
else {
g_warning("gradient does not provide function `%s'", name);
}
gwy_data_field_normalize(showfield);
gwy_data_field_data_changed(showfield);
}
/* vim: set cin et ts=4 sw=4 cino=>1s,e0,n0,f0,{0,}0,^0,\:1s,=0,g1s,h0,t0,+1s,c3,(0,u0 : */
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