PIKApp/app/propgui/pikapropgui-spiral.c

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2023-09-26 00:35:21 +02:00
/* PIKA - Photo and Image Kooker Application
* a rebranding of The GNU Image Manipulation Program (created with heckimp)
* A derived work which may be trivial. However, any changes may be (C)2023 by Aldercone Studio
*
* Original copyright, applying to most contents (license remains unchanged):
* Copyright (C) 1995-1997 Spencer Kimball and Peter Mattis
*
* pikapropgui-spiral.c
* Copyright (C) 2017 Michael Natterer <mitch@gimp.org>
*
* 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 3 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, see <https://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <gegl.h>
#include <gtk/gtk.h>
#include "libpikamath/pikamath.h"
#include "libpikawidgets/pikawidgets.h"
#include "propgui-types.h"
#include "core/pikacontext.h"
#include "pikapropgui.h"
#include "pikapropgui-generic.h"
#include "pikapropgui-spiral.h"
#include "pika-intl.h"
typedef enum
{
GEGL_SPIRAL_TYPE_LINEAR,
GEGL_SPIRAL_TYPE_LOGARITHMIC
} GeglSpiralType;
static void
slider_line_callback (GObject *config,
GeglRectangle *area,
gdouble x1,
gdouble y1,
gdouble x2,
gdouble y2,
const PikaControllerSlider *sliders,
gint n_sliders)
{
GeglSpiralType type;
gdouble x, y;
gdouble radius;
gdouble rotation;
gdouble base;
gdouble balance;
g_object_set_data_full (G_OBJECT (config), "area",
g_memdup2 (area, sizeof (GeglRectangle)),
(GDestroyNotify) g_free);
g_object_get (config,
"type", &type,
"base", &base,
"balance", &balance,
NULL);
x = x1 / area->width;
y = y1 / area->height;
radius = sqrt (SQR (x2 - x1) + SQR (y2 - y1));
rotation = atan2 (-(y2 - y1), x2 - x1) * 180 / G_PI;
if (rotation < 0)
rotation += 360.0;
switch (type)
{
case GEGL_SPIRAL_TYPE_LINEAR:
balance = 3.0 - 4.0 * sliders[0].value;
break;
case GEGL_SPIRAL_TYPE_LOGARITHMIC:
{
gdouble old_base = base;
base = 1.0 / sliders[1].value;
base = MIN (base, 1000000.0);
/* keep "balance" fixed when changing "base", or when "base" is 1, in
* which case there's no inverse mapping for the slider value, and we
* can get NaN.
*/
if (base == old_base && base > 1.0)
{
balance = -4.0 * log (sliders[0].value) / log (base) - 1.0;
balance = CLAMP (balance, -1.0, 1.0);
}
}
break;
}
g_object_set (config,
"x", x,
"y", y,
"radius", radius,
"base", base,
"rotation", rotation,
"balance", balance,
NULL);
}
static void
config_notify (GObject *config,
const GParamSpec *pspec,
gpointer set_data)
{
PikaControllerSliderLineCallback set_func;
GeglRectangle *area;
GeglSpiralType type;
gdouble x, y;
gdouble radius;
gdouble rotation;
gdouble base;
gdouble balance;
gdouble x1, y1, x2, y2;
PikaControllerSlider sliders[2];
gint n_sliders = 0;
set_func = g_object_get_data (G_OBJECT (config), "set-func");
area = g_object_get_data (G_OBJECT (config), "area");
g_object_get (config,
"type", &type,
"x", &x,
"y", &y,
"radius", &radius,
"rotation", &rotation,
"base", &base,
"balance", &balance,
NULL);
x1 = x * area->width;
y1 = y * area->height;
x2 = x1 + cos (rotation * (G_PI / 180.0)) * radius;
y2 = y1 - sin (rotation * (G_PI / 180.0)) * radius;
switch (type)
{
case GEGL_SPIRAL_TYPE_LINEAR:
n_sliders = 1;
/* balance */
sliders[0] = PIKA_CONTROLLER_SLIDER_DEFAULT;
sliders[0].min = 0.5;
sliders[0].max = 1.0;
sliders[0].value = 0.5 + (1.0 - balance) / 4.0;
break;
case GEGL_SPIRAL_TYPE_LOGARITHMIC:
n_sliders = 2;
/* balance */
sliders[0] = PIKA_CONTROLLER_SLIDER_DEFAULT;
sliders[0].min = 1.0 / sqrt (base);
sliders[0].max = 1.0;
sliders[0].value = pow (base, -(balance + 1.0) / 4.0);
/* base */
sliders[1] = PIKA_CONTROLLER_SLIDER_DEFAULT;
sliders[1].min = 0.0;
sliders[1].max = 1.0;
sliders[1].value = 1.0 / base;
break;
}
set_func (set_data, area, x1, y1, x2, y2, sliders, n_sliders);
}
GtkWidget *
_pika_prop_gui_new_spiral (GObject *config,
GParamSpec **param_specs,
guint n_param_specs,
GeglRectangle *area,
PikaContext *context,
PikaCreatePickerFunc create_picker_func,
PikaCreateControllerFunc create_controller_func,
gpointer creator)
{
GtkWidget *vbox;
g_return_val_if_fail (G_IS_OBJECT (config), NULL);
g_return_val_if_fail (param_specs != NULL, NULL);
g_return_val_if_fail (n_param_specs > 0, NULL);
g_return_val_if_fail (PIKA_IS_CONTEXT (context), NULL);
vbox = _pika_prop_gui_new_generic (config,
param_specs, n_param_specs,
area, context,
create_picker_func,
create_controller_func,
creator);
if (create_controller_func)
{
GCallback set_func;
gpointer set_data;
set_func = create_controller_func (creator,
PIKA_CONTROLLER_TYPE_SLIDER_LINE,
_("Spiral: "),
(GCallback) slider_line_callback,
config,
&set_data);
g_object_set_data (G_OBJECT (config), "set-func", set_func);
g_object_set_data_full (G_OBJECT (config), "area",
g_memdup2 (area, sizeof (GeglRectangle)),
(GDestroyNotify) g_free);
config_notify (config, NULL, set_data);
g_signal_connect (config, "notify",
G_CALLBACK (config_notify),
set_data);
}
return vbox;
}