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-rw-r--r--app/widgets/gimpblobeditor.c389
1 files changed, 389 insertions, 0 deletions
diff --git a/app/widgets/gimpblobeditor.c b/app/widgets/gimpblobeditor.c
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+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * 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 <gtk/gtk.h>
+
+#include "widgets-types.h"
+
+#include "libgimpmath/gimpmath.h"
+
+#include "paint/gimpink-blob.h"
+
+#include "gimpblobeditor.h"
+
+
+enum
+{
+ PROP_0,
+ PROP_TYPE,
+ PROP_ASPECT,
+ PROP_ANGLE
+};
+
+
+static void gimp_blob_editor_set_property (GObject *object,
+ guint property_id,
+ const GValue *value,
+ GParamSpec *pspec);
+static void gimp_blob_editor_get_property (GObject *object,
+ guint property_id,
+ GValue *value,
+ GParamSpec *pspec);
+
+static gboolean gimp_blob_editor_expose (GtkWidget *widget,
+ GdkEventExpose *event);
+static gboolean gimp_blob_editor_button_press (GtkWidget *widget,
+ GdkEventButton *event);
+static gboolean gimp_blob_editor_button_release (GtkWidget *widget,
+ GdkEventButton *event);
+static gboolean gimp_blob_editor_motion_notify (GtkWidget *widget,
+ GdkEventMotion *event);
+
+static void gimp_blob_editor_get_handle (GimpBlobEditor *editor,
+ GdkRectangle *rect);
+static void gimp_blob_editor_draw_blob (GimpBlobEditor *editor,
+ cairo_t *cr,
+ gdouble xc,
+ gdouble yc,
+ gdouble radius);
+
+
+G_DEFINE_TYPE (GimpBlobEditor, gimp_blob_editor, GTK_TYPE_DRAWING_AREA)
+
+#define parent_class gimp_blob_editor_parent_class
+
+
+static void
+gimp_blob_editor_class_init (GimpBlobEditorClass *klass)
+{
+ GObjectClass *object_class = G_OBJECT_CLASS (klass);
+ GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
+
+ object_class->set_property = gimp_blob_editor_set_property;
+ object_class->get_property = gimp_blob_editor_get_property;
+
+ widget_class->expose_event = gimp_blob_editor_expose;
+ widget_class->button_press_event = gimp_blob_editor_button_press;
+ widget_class->button_release_event = gimp_blob_editor_button_release;
+ widget_class->motion_notify_event = gimp_blob_editor_motion_notify;
+
+ g_object_class_install_property (object_class, PROP_TYPE,
+ g_param_spec_enum ("blob-type",
+ NULL, NULL,
+ GIMP_TYPE_INK_BLOB_TYPE,
+ GIMP_INK_BLOB_TYPE_CIRCLE,
+ GIMP_PARAM_READWRITE |
+ G_PARAM_CONSTRUCT));
+ g_object_class_install_property (object_class, PROP_ASPECT,
+ g_param_spec_double ("blob-aspect",
+ NULL, NULL,
+ 1.0, 10.0, 1.0,
+ GIMP_PARAM_READWRITE |
+ G_PARAM_CONSTRUCT));
+ g_object_class_install_property (object_class, PROP_ANGLE,
+ g_param_spec_double ("blob-angle",
+ NULL, NULL,
+ -G_PI, G_PI, 0.0,
+ GIMP_PARAM_READWRITE |
+ G_PARAM_CONSTRUCT));
+}
+
+static void
+gimp_blob_editor_init (GimpBlobEditor *editor)
+{
+ editor->active = FALSE;
+
+ gtk_widget_add_events (GTK_WIDGET (editor),
+ GDK_BUTTON_PRESS_MASK |
+ GDK_BUTTON_RELEASE_MASK |
+ GDK_POINTER_MOTION_MASK |
+ GDK_EXPOSURE_MASK);
+}
+
+GtkWidget *
+gimp_blob_editor_new (GimpInkBlobType type,
+ gdouble aspect,
+ gdouble angle)
+{
+ return g_object_new (GIMP_TYPE_BLOB_EDITOR,
+ "blob-type", type,
+ "blob-aspect", aspect,
+ "blob-angle", angle,
+ NULL);
+}
+
+static void
+gimp_blob_editor_set_property (GObject *object,
+ guint property_id,
+ const GValue *value,
+ GParamSpec *pspec)
+{
+ GimpBlobEditor *editor = GIMP_BLOB_EDITOR (object);
+
+ switch (property_id)
+ {
+ case PROP_TYPE:
+ editor->type = g_value_get_enum (value);
+ break;
+ case PROP_ASPECT:
+ editor->aspect = g_value_get_double (value);
+ break;
+ case PROP_ANGLE:
+ editor->angle = g_value_get_double (value);
+ break;
+
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+ break;
+ }
+
+ gtk_widget_queue_draw (GTK_WIDGET (editor));
+}
+
+static void
+gimp_blob_editor_get_property (GObject *object,
+ guint property_id,
+ GValue *value,
+ GParamSpec *pspec)
+{
+ GimpBlobEditor *editor = GIMP_BLOB_EDITOR (object);
+
+ switch (property_id)
+ {
+ case PROP_TYPE:
+ g_value_set_enum (value, editor->type);
+ break;
+ case PROP_ASPECT:
+ g_value_set_double (value, editor->aspect);
+ break;
+ case PROP_ANGLE:
+ g_value_set_double (value, editor->angle);
+ break;
+
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+ break;
+ }
+}
+
+static gboolean
+gimp_blob_editor_expose (GtkWidget *widget,
+ GdkEventExpose *event)
+{
+ GimpBlobEditor *editor = GIMP_BLOB_EDITOR (widget);
+ GtkStyle *style = gtk_widget_get_style (widget);
+ GtkStateType state = gtk_widget_get_state (widget);
+ GtkAllocation allocation;
+ cairo_t *cr;
+ GdkRectangle rect;
+ gint r0;
+
+ gtk_widget_get_allocation (widget, &allocation);
+
+ r0 = MIN (allocation.width, allocation.height) / 2;
+
+ if (r0 < 2)
+ return TRUE;
+
+ cr = gdk_cairo_create (gtk_widget_get_window (widget));
+
+ gimp_blob_editor_draw_blob (editor, cr,
+ allocation.width / 2.0,
+ allocation.height / 2.0,
+ 0.9 * r0);
+
+ gimp_blob_editor_get_handle (editor, &rect);
+
+ cairo_rectangle (cr,
+ rect.x + 0.5, rect.y + 0.5, rect.width - 1, rect.width - 1);
+ gdk_cairo_set_source_color (cr, &style->light[state]);
+ cairo_fill_preserve (cr);
+
+ gdk_cairo_set_source_color (cr, &style->dark[state]);
+ cairo_set_line_width (cr, 1);
+ cairo_stroke (cr);
+
+ cairo_destroy (cr);
+
+ return TRUE;
+}
+
+static gboolean
+gimp_blob_editor_button_press (GtkWidget *widget,
+ GdkEventButton *event)
+{
+ GimpBlobEditor *editor = GIMP_BLOB_EDITOR (widget);
+ GdkRectangle rect;
+
+ gimp_blob_editor_get_handle (editor, &rect);
+
+ if ((event->x >= rect.x) && (event->x - rect.x < rect.width) &&
+ (event->y >= rect.y) && (event->y - rect.y < rect.height))
+ {
+ editor->active = TRUE;
+ }
+
+ return TRUE;
+}
+
+static gboolean
+gimp_blob_editor_button_release (GtkWidget *widget,
+ GdkEventButton *event)
+{
+ GimpBlobEditor *editor = GIMP_BLOB_EDITOR (widget);
+
+ editor->active = FALSE;
+
+ return TRUE;
+}
+
+static gboolean
+gimp_blob_editor_motion_notify (GtkWidget *widget,
+ GdkEventMotion *event)
+{
+ GimpBlobEditor *editor = GIMP_BLOB_EDITOR (widget);
+
+ if (editor->active)
+ {
+ GtkAllocation allocation;
+ gint x;
+ gint y;
+ gint rsquare;
+
+ gtk_widget_get_allocation (widget, &allocation);
+
+ x = event->x - allocation.width / 2;
+ y = event->y - allocation.height / 2;
+
+ rsquare = SQR (x) + SQR (y);
+
+ if (rsquare > 0)
+ {
+ gint r0;
+ gdouble angle;
+ gdouble aspect;
+
+ r0 = MIN (allocation.width, allocation.height) / 2;
+
+ angle = atan2 (y, x);
+ aspect = 10.0 * sqrt ((gdouble) rsquare / (r0 * r0)) / 0.85;
+
+ aspect = CLAMP (aspect, 1.0, 10.0);
+
+ g_object_set (editor,
+ "blob-angle", angle,
+ "blob-aspect", aspect,
+ NULL);
+ }
+ }
+
+ return TRUE;
+}
+
+static void
+gimp_blob_editor_get_handle (GimpBlobEditor *editor,
+ GdkRectangle *rect)
+{
+ GtkWidget *widget = GTK_WIDGET (editor);
+ GtkAllocation allocation;
+ gint x, y;
+ gint r;
+
+ gtk_widget_get_allocation (widget, &allocation);
+
+ r = MIN (allocation.width, allocation.height) / 2;
+
+ x = (allocation.width / 2 +
+ 0.85 * r *editor->aspect / 10.0 * cos (editor->angle));
+
+ y = (allocation.height / 2 +
+ 0.85 * r * editor->aspect / 10.0 * sin (editor->angle));
+
+ rect->x = x - 5;
+ rect->y = y - 5;
+ rect->width = 10;
+ rect->height = 10;
+}
+
+static void
+gimp_blob_editor_draw_blob (GimpBlobEditor *editor,
+ cairo_t *cr,
+ gdouble xc,
+ gdouble yc,
+ gdouble radius)
+{
+ GtkWidget *widget = GTK_WIDGET (editor);
+ GtkStyle *style = gtk_widget_get_style (widget);
+ GimpBlob *blob;
+ GimpBlobFunc function = gimp_blob_ellipse;
+ gint i;
+
+ switch (editor->type)
+ {
+ case GIMP_INK_BLOB_TYPE_CIRCLE:
+ function = gimp_blob_ellipse;
+ break;
+
+ case GIMP_INK_BLOB_TYPE_SQUARE:
+ function = gimp_blob_square;
+ break;
+
+ case GIMP_INK_BLOB_TYPE_DIAMOND:
+ function = gimp_blob_diamond;
+ break;
+ }
+
+ /* to get a nice antialiased outline, render the blob at double size */
+ radius *= 2.0;
+ blob = function (2.0 * xc, 2.0 * yc,
+ radius * cos (editor->angle),
+ radius * sin (editor->angle),
+ (- (radius / editor->aspect) * sin (editor->angle)),
+ ( (radius / editor->aspect) * cos (editor->angle)));
+
+ for (i = 0; i < blob->height; i++)
+ if (blob->data[i].left <= blob->data[i].right)
+ {
+ cairo_move_to (cr, blob->data[i].left / 2.0, (blob->y + i) / 2.0);
+ break;
+ }
+
+ for (i = i + 1; i < blob->height; i++)
+ {
+ if (blob->data[i].left > blob->data[i].right)
+ break;
+
+ cairo_line_to (cr, blob->data[i].left / 2.0, (blob->y + i) / 2.0);
+ }
+
+ for (i = i - 1; i >= 0; i--)
+ {
+ if (blob->data[i].left > blob->data[i].right)
+ break;
+
+ cairo_line_to (cr, blob->data[i].right / 2.0, (blob->y + i) / 2.0);
+ }
+
+ cairo_close_path (cr);
+
+ g_free (blob);
+
+ gdk_cairo_set_source_color (cr, &style->fg[gtk_widget_get_state (widget)]);
+ cairo_fill (cr);
+}
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