[gimp] app: add a custom GUI for gegl:supernova, with an on-canvas controller

[Michael Natterer <mitch src gnome org>]

commit 6de4fca580c19e698900533366b7eb7c6725fe8d
Author: Michael Natterer <mitch gimp org>
Date:   Mon Jul 3 12:45:59 2017 +0200

    app: add a custom GUI for gegl:supernova, with an on-canvas controller

 app/propgui/Makefile.am             |    4 +-
 app/propgui/gimppropgui-supernova.c |  141 +++++++++++++++++++++++++++++++++++
 app/propgui/gimppropgui-supernova.h |   35 +++++++++
 app/propgui/gimppropgui.c           |    5 +-
 4 files changed, 183 insertions(+), 2 deletions(-)
---
diff --git a/app/propgui/Makefile.am b/app/propgui/Makefile.am
index 5b7bb12..f45d705 100644
--- a/app/propgui/Makefile.am
+++ b/app/propgui/Makefile.am
@@ -36,4 +36,6 @@ libapppropgui_a_SOURCES = \
        gimppropgui-hue-saturation.c            \
        gimppropgui-hue-saturation.h            \
        gimppropgui-spiral.c                    \
-       gimppropgui-spiral.h
+       gimppropgui-spiral.h                    \
+       gimppropgui-supernova.c                 \
+       gimppropgui-supernova.h
diff --git a/app/propgui/gimppropgui-supernova.c b/app/propgui/gimppropgui-supernova.c
new file mode 100644
index 0000000..b79f916
--- /dev/null
+++ b/app/propgui/gimppropgui-supernova.c
@@ -0,0 +1,141 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995-1997 Spencer Kimball and Peter Mattis
+ *
+ * gimppropgui-supernova.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 <http://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-generic.h"
+#include "gimppropgui-supernova.h"
+
+
+static void
+line_callback (GObject       *config,
+               GeglRectangle *area,
+               gdouble        x1,
+               gdouble        y1,
+               gdouble        x2,
+               gdouble        y2)
+{
+  gdouble x, y;
+  gint    radius;
+
+  g_object_set_data_full (G_OBJECT (config), "area",
+                          g_memdup (area, sizeof (GeglRectangle)),
+                          (GDestroyNotify) g_free);
+
+  x      = x1 / area->width;
+  y      = y1 / area->height;
+  radius = sqrt (SQR (x2 - x1) + SQR (y2 - y1));
+
+  g_object_set (config,
+                "center-x", x,
+                "center-y", y,
+                "radius",   radius,
+                NULL);
+}
+
+static void
+config_notify (GObject          *config,
+               const GParamSpec *pspec,
+               gpointer          set_data)
+{
+  GimpControllerLineCallback  set_func;
+  GeglRectangle              *area;
+  gdouble                     x, y;
+  gint                        radius;
+  gdouble                     x1, y1, x2, y2;
+
+  set_func = g_object_get_data (G_OBJECT (config), "set-func");
+  area     = g_object_get_data (G_OBJECT (config), "area");
+
+  g_object_get (config,
+                "center-x", &x,
+                "center-y", &y,
+                "radius",   &radius,
+                NULL);
+
+  x1 = x * area->width;
+  y1 = y * area->height;
+  x2 = x1 + radius;
+  y2 = y1;
+
+  set_func (set_data, area, x1, y1, x2, y2);
+}
+
+GtkWidget *
+_gimp_prop_gui_new_supernova (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_LINE,
+                                         (GCallback) 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;
+}
diff --git a/app/propgui/gimppropgui-supernova.h b/app/propgui/gimppropgui-supernova.h
new file mode 100644
index 0000000..429adb2
--- /dev/null
+++ b/app/propgui/gimppropgui-supernova.h
@@ -0,0 +1,35 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995-1997 Spencer Kimball and Peter Mattis
+ *
+ * gimppropgui-supernova.h
+ *
+ * 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 <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GIMP_PROP_GUI_SUPERNOVA_H__
+#define __GIMP_PROP_GUI_SUPERNOVA_H__
+
+
+GtkWidget *
+_gimp_prop_gui_new_supernova (GObject                  *config,
+                              GParamSpec              **param_specs,
+                              guint                     n_param_specs,
+                              GeglRectangle            *area,
+                              GimpContext              *context,
+                              GimpCreatePickerFunc      create_picker_func,
+                              GimpCreateControllerFunc  create_controller_func,
+                              gpointer                  creator);
+
+
+#endif /* __GIMP_PROP_GUI_SUPERNOVA_H__ */
diff --git a/app/propgui/gimppropgui.c b/app/propgui/gimppropgui.c
index eab091a..175c9f4 100644
--- a/app/propgui/gimppropgui.c
+++ b/app/propgui/gimppropgui.c
@@ -51,10 +51,11 @@
 #include "gimppropgui-color-rotate.h"
 #include "gimppropgui-convolution-matrix.h"
 #include "gimppropgui-diffration-patterns.h"
-#include "gimppropgui-spiral.h"
 #include "gimppropgui-eval.h"
 #include "gimppropgui-generic.h"
 #include "gimppropgui-hue-saturation.h"
+#include "gimppropgui-spiral.h"
+#include "gimppropgui-supernova.h"
 
 #include "gimp-intl.h"
 
@@ -467,6 +468,8 @@ gui_new_funcs[] =
     _gimp_prop_gui_new_diffraction_patterns },
   { "GimpGegl-gegl-spiral-config",
     _gimp_prop_gui_new_spiral },
+  { "GimpGegl-gegl-supernova-config",
+    _gimp_prop_gui_new_supernova },
   { NULL,
     _gimp_prop_gui_new_generic }
 };