diff options
Diffstat (limited to 'app/propgui/gimppropgui-spiral.c')
| -rw-r--r-- | app/propgui/gimppropgui-spiral.c | 239 |
1 files changed, 239 insertions, 0 deletions
diff --git a/app/propgui/gimppropgui-spiral.c b/app/propgui/gimppropgui-spiral.c new file mode 100644 index 0000000..9aaded2 --- /dev/null +++ b/app/propgui/gimppropgui-spiral.c @@ -0,0 +1,239 @@ +/* GIMP - The GNU Image Manipulation Program + * Copyright (C) 1995-1997 Spencer Kimball and Peter Mattis + * + * gimppropgui-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 "libgimpmath/gimpmath.h" +#include "libgimpwidgets/gimpwidgets.h" + +#include "propgui-types.h" + +#include "core/gimpcontext.h" + +#include "gimppropgui.h" +#include "gimppropgui-generic.h" +#include "gimppropgui-spiral.h" + +#include "gimp-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 GimpControllerSlider *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_memdup (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) +{ + GimpControllerSliderLineCallback set_func; + GeglRectangle *area; + GeglSpiralType type; + gdouble x, y; + gdouble radius; + gdouble rotation; + gdouble base; + gdouble balance; + gdouble x1, y1, x2, y2; + GimpControllerSlider 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] = GIMP_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] = GIMP_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] = GIMP_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 * +_gimp_prop_gui_new_spiral (GObject *config, + GParamSpec **param_specs, + guint n_param_specs, + GeglRectangle *area, + GimpContext *context, + GimpCreatePickerFunc create_picker_func, + GimpCreateControllerFunc 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 (GIMP_IS_CONTEXT (context), NULL); + + vbox = _gimp_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, + GIMP_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_memdup (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; +} |