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/*
* $Id: graph_level.c 24414 2021-10-22 16:05:29Z 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., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include "config.h"
#include <libgwyddion/gwymacros.h>
#include <libgwyddion/gwymath.h>
#include <libgwydgets/gwygraphmodel.h>
#include <libgwydgets/gwystock.h>
#include <libgwymodule/gwymodule-graph.h>
#include <app/gwyapp.h>
static gboolean module_register(void);
static void level (GwyGraph *graph);
static void level_do (const gdouble *x,
gdouble *y,
gdouble n);
static GwyModuleInfo module_info = {
GWY_MODULE_ABI_VERSION,
&module_register,
N_("Level graph by line."),
"Petr Klapetek <klapetek@gwyddion.net>",
"1.5",
"David Nečas (Yeti) & Petr Klapetek",
"2005",
};
GWY_MODULE_QUERY2(module_info, graph_level)
static gboolean
module_register(void)
{
gwy_graph_func_register("graph_level",
(GwyGraphFunc)&level,
N_("/_Correct Data/_Level"),
GWY_STOCK_GRAPH_LEVEL,
GWY_MENU_FLAG_GRAPH_CURVE,
N_("Level graph curves"));
return TRUE;
}
static void
level(GwyGraph *graph)
{
GwyContainer *data;
GwyGraphCurveModel *cmodel;
const gdouble *xdata, *ydata;
GArray *newydata;
gint i, ncurves, ndata;
GQuark quark;
gwy_app_data_browser_get_current(GWY_APP_CONTAINER, &data,
GWY_APP_GRAPH_MODEL_KEY, &quark,
0);
gwy_app_undo_qcheckpointv(data, 1, &quark);
ncurves = gwy_graph_model_get_n_curves(gwy_graph_get_model(graph));
newydata = g_array_new(FALSE, FALSE, sizeof(gdouble));
for (i = 0; i < ncurves; i++) {
cmodel = gwy_graph_model_get_curve(gwy_graph_get_model(graph), i);
xdata = gwy_graph_curve_model_get_xdata(cmodel);
ydata = gwy_graph_curve_model_get_ydata(cmodel);
ndata = gwy_graph_curve_model_get_ndata(cmodel);
g_array_set_size(newydata, 0);
g_array_append_vals(newydata, ydata, ndata);
level_do(xdata, (gdouble*)newydata->data, ndata);
gwy_graph_curve_model_set_data(cmodel, xdata, (gdouble*)newydata->data,
ndata);
}
for (i = 0; i < ncurves; i++) {
cmodel = gwy_graph_model_get_curve(gwy_graph_get_model(graph), i);
g_signal_emit_by_name(cmodel, "data-changed");
}
g_array_free(newydata, TRUE);
}
static void
level_do(const gdouble *x, gdouble *y, gdouble n)
{
gdouble result[2];
gint i;
gwy_math_fit_polynom(n, x, y, 1, result);
for (i = 0; i < n; i++)
y[i] -= result[0] + result[1]*x[i];
}
/* 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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