Adding upstream version 2.10.34.upstream/2.10.34upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1218 insertions, 0 deletions

diff --git a/app/display/gimptoolcompass.c b/app/display/gimptoolcompass.c
new file mode 100644
index 0000000..3d9045b
--- /dev/null
+++ b/app/display/gimptoolcompass.c
@@ -0,0 +1,1218 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimptoolcompass.c
+ * Copyright (C) 2017 Michael Natterer <mitch@gimp.org>
+ *
+ * Measure tool
+ * Copyright (C) 1999-2003 Sven Neumann <sven@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 "libgimpbase/gimpbase.h"
+#include "libgimpmath/gimpmath.h"
+
+#include "display-types.h"
+
+#include "core/gimp-utils.h"
+#include "core/gimpimage.h"
+#include "core/gimpmarshal.h"
+
+#include "widgets/gimpwidgets-utils.h"
+
+#include "gimpcanvashandle.h"
+#include "gimpcanvasline.h"
+#include "gimpdisplay.h"
+#include "gimpdisplayshell.h"
+#include "gimpdisplayshell-appearance.h"
+#include "gimpdisplayshell-transform.h"
+#include "gimpdisplayshell-utils.h"
+#include "gimptoolcompass.h"
+
+#include "gimp-intl.h"
+
+
+#define ARC_RADIUS 30
+#define ARC_GAP    (ARC_RADIUS / 2)
+#define EPSILON    1e-6
+
+
+/*  possible measure functions  */
+typedef enum
+{
+  CREATING,
+  ADDING,
+  MOVING,
+  MOVING_ALL,
+  GUIDING,
+  FINISHED
+} CompassFunction;
+
+enum
+{
+  PROP_0,
+  PROP_ORIENTATION,
+  PROP_N_POINTS,
+  PROP_X1,
+  PROP_Y1,
+  PROP_X2,
+  PROP_Y2,
+  PROP_X3,
+  PROP_Y3,
+  PROP_PIXEL_ANGLE,
+  PROP_UNIT_ANGLE,
+  PROP_EFFECTIVE_ORIENTATION
+};
+
+enum
+{
+  CREATE_GUIDES,
+  LAST_SIGNAL
+};
+
+struct _GimpToolCompassPrivate
+{
+  GimpCompassOrientation  orientation;
+  gint                    n_points;
+  gint                    x[3];
+  gint                    y[3];
+
+  GimpVector2             radius1;
+  GimpVector2             radius2;
+  gdouble                 display_angle;
+  gdouble                 pixel_angle;
+  gdouble                 unit_angle;
+  GimpCompassOrientation  effective_orientation;
+
+  CompassFunction         function;
+  gdouble                 mouse_x;
+  gdouble                 mouse_y;
+  gint                    last_x;
+  gint                    last_y;
+  gint                    point;
+
+  GimpCanvasItem         *line1;
+  GimpCanvasItem         *line2;
+  GimpCanvasItem         *arc;
+  GimpCanvasItem         *arc_line;
+  GimpCanvasItem         *handles[3];
+};
+
+
+/*  local function prototypes  */
+
+static void     gimp_tool_compass_constructed     (GObject                *object);
+static void     gimp_tool_compass_set_property    (GObject                *object,
+                                                   guint                   property_id,
+                                                   const GValue           *value,
+                                                   GParamSpec             *pspec);
+static void     gimp_tool_compass_get_property    (GObject                *object,
+                                                   guint                   property_id,
+                                                   GValue                 *value,
+                                                   GParamSpec             *pspec);
+
+static void     gimp_tool_compass_changed         (GimpToolWidget         *widget);
+static gint     gimp_tool_compass_button_press    (GimpToolWidget         *widget,
+                                                   const GimpCoords       *coords,
+                                                   guint32                 time,
+                                                   GdkModifierType         state,
+                                                   GimpButtonPressType     press_type);
+static void     gimp_tool_compass_button_release  (GimpToolWidget         *widget,
+                                                   const GimpCoords       *coords,
+                                                   guint32                 time,
+                                                   GdkModifierType         state,
+                                                   GimpButtonReleaseType   release_type);
+static void     gimp_tool_compass_motion          (GimpToolWidget         *widget,
+                                                   const GimpCoords       *coords,
+                                                   guint32                 time,
+                                                   GdkModifierType         state);
+static GimpHit  gimp_tool_compass_hit             (GimpToolWidget         *widget,
+                                                   const GimpCoords       *coords,
+                                                   GdkModifierType         state,
+                                                   gboolean                proximity);
+static void     gimp_tool_compass_hover           (GimpToolWidget         *widget,
+                                                   const GimpCoords       *coords,
+                                                   GdkModifierType         state,
+                                                   gboolean                proximity);
+static void     gimp_tool_compass_leave_notify    (GimpToolWidget         *widget);
+static void     gimp_tool_compass_motion_modifier (GimpToolWidget         *widget,
+                                                   GdkModifierType         key,
+                                                   gboolean                press,
+                                                   GdkModifierType         state);
+static gboolean gimp_tool_compass_get_cursor      (GimpToolWidget         *widget,
+                                                   const GimpCoords       *coords,
+                                                   GdkModifierType         state,
+                                                   GimpCursorType         *cursor,
+                                                   GimpToolCursorType     *tool_cursor,
+                                                   GimpCursorModifier     *modifier);
+
+static gint     gimp_tool_compass_get_point       (GimpToolCompass        *compass,
+                                                   const GimpCoords       *coords);
+static void     gimp_tool_compass_update_hilight  (GimpToolCompass        *compass);
+static void     gimp_tool_compass_update_angle    (GimpToolCompass        *compass,
+                                                   GimpCompassOrientation  orientation,
+                                                   gboolean                flip);
+
+
+G_DEFINE_TYPE_WITH_PRIVATE (GimpToolCompass, gimp_tool_compass,
+                            GIMP_TYPE_TOOL_WIDGET)
+
+#define parent_class gimp_tool_compass_parent_class
+
+static guint compass_signals[LAST_SIGNAL] = { 0 };
+
+
+static void
+gimp_tool_compass_class_init (GimpToolCompassClass *klass)
+{
+  GObjectClass        *object_class = G_OBJECT_CLASS (klass);
+  GimpToolWidgetClass *widget_class = GIMP_TOOL_WIDGET_CLASS (klass);
+
+  object_class->constructed      = gimp_tool_compass_constructed;
+  object_class->set_property     = gimp_tool_compass_set_property;
+  object_class->get_property     = gimp_tool_compass_get_property;
+
+  widget_class->changed          = gimp_tool_compass_changed;
+  widget_class->button_press     = gimp_tool_compass_button_press;
+  widget_class->button_release   = gimp_tool_compass_button_release;
+  widget_class->motion           = gimp_tool_compass_motion;
+  widget_class->hit              = gimp_tool_compass_hit;
+  widget_class->hover            = gimp_tool_compass_hover;
+  widget_class->leave_notify     = gimp_tool_compass_leave_notify;
+  widget_class->motion_modifier  = gimp_tool_compass_motion_modifier;
+  widget_class->get_cursor       = gimp_tool_compass_get_cursor;
+  widget_class->update_on_scale  = TRUE;
+  widget_class->update_on_rotate = TRUE;
+
+  compass_signals[CREATE_GUIDES] =
+    g_signal_new ("create-guides",
+                  G_TYPE_FROM_CLASS (klass),
+                  G_SIGNAL_RUN_FIRST,
+                  G_STRUCT_OFFSET (GimpToolCompassClass, create_guides),
+                  NULL, NULL,
+                  gimp_marshal_VOID__INT_INT_BOOLEAN_BOOLEAN,
+                  G_TYPE_NONE, 4,
+                  G_TYPE_INT,
+                  G_TYPE_INT,
+                  G_TYPE_BOOLEAN,
+                  G_TYPE_BOOLEAN);
+
+  g_object_class_install_property (object_class, PROP_ORIENTATION,
+                                   g_param_spec_enum ("orientation", NULL, NULL,
+                                                      GIMP_TYPE_COMPASS_ORIENTATION,
+                                                      GIMP_COMPASS_ORIENTATION_AUTO,
+                                                      GIMP_PARAM_READWRITE |
+                                                      G_PARAM_CONSTRUCT));
+
+  g_object_class_install_property (object_class, PROP_N_POINTS,
+                                   g_param_spec_int ("n-points", NULL, NULL,
+                                                     1, 3, 1,
+                                                     GIMP_PARAM_READWRITE |
+                                                     G_PARAM_CONSTRUCT));
+
+  g_object_class_install_property (object_class, PROP_X1,
+                                   g_param_spec_int ("x1", NULL, NULL,
+                                                     -GIMP_MAX_IMAGE_SIZE,
+                                                     GIMP_MAX_IMAGE_SIZE, 0,
+                                                     GIMP_PARAM_READWRITE |
+                                                     G_PARAM_CONSTRUCT));
+
+  g_object_class_install_property (object_class, PROP_Y1,
+                                   g_param_spec_int ("y1", NULL, NULL,
+                                                     -GIMP_MAX_IMAGE_SIZE,
+                                                     GIMP_MAX_IMAGE_SIZE, 0,
+                                                     GIMP_PARAM_READWRITE |
+                                                     G_PARAM_CONSTRUCT));
+
+  g_object_class_install_property (object_class, PROP_X2,
+                                   g_param_spec_int ("x2", NULL, NULL,
+                                                     -GIMP_MAX_IMAGE_SIZE,
+                                                     GIMP_MAX_IMAGE_SIZE, 0,
+                                                     GIMP_PARAM_READWRITE |
+                                                     G_PARAM_CONSTRUCT));
+
+  g_object_class_install_property (object_class, PROP_Y2,
+                                   g_param_spec_int ("y2", NULL, NULL,
+                                                     -GIMP_MAX_IMAGE_SIZE,
+                                                     GIMP_MAX_IMAGE_SIZE, 0,
+                                                     GIMP_PARAM_READWRITE |
+                                                     G_PARAM_CONSTRUCT));
+
+  g_object_class_install_property (object_class, PROP_X3,
+                                   g_param_spec_int ("x3", NULL, NULL,
+                                                     -GIMP_MAX_IMAGE_SIZE,
+                                                     GIMP_MAX_IMAGE_SIZE, 0,
+                                                     GIMP_PARAM_READWRITE |
+                                                     G_PARAM_CONSTRUCT));
+
+  g_object_class_install_property (object_class, PROP_Y3,
+                                   g_param_spec_int ("y3", NULL, NULL,
+                                                     -GIMP_MAX_IMAGE_SIZE,
+                                                     GIMP_MAX_IMAGE_SIZE, 0,
+                                                     GIMP_PARAM_READWRITE |
+                                                     G_PARAM_CONSTRUCT));
+
+  g_object_class_install_property (object_class, PROP_PIXEL_ANGLE,
+                                   g_param_spec_double ("pixel-angle", NULL, NULL,
+                                                        -G_PI, G_PI, 0.0,
+                                                        GIMP_PARAM_READABLE));
+
+  g_object_class_install_property (object_class, PROP_UNIT_ANGLE,
+                                   g_param_spec_double ("unit-angle", NULL, NULL,
+                                                        -G_PI, G_PI, 0.0,
+                                                        GIMP_PARAM_READABLE));
+
+  g_object_class_install_property (object_class, PROP_EFFECTIVE_ORIENTATION,
+                                   g_param_spec_enum ("effective-orientation", NULL, NULL,
+                                                      GIMP_TYPE_COMPASS_ORIENTATION,
+                                                      GIMP_COMPASS_ORIENTATION_AUTO,
+                                                      GIMP_PARAM_READABLE));
+}
+
+static void
+gimp_tool_compass_init (GimpToolCompass *compass)
+{
+  compass->private = gimp_tool_compass_get_instance_private (compass);
+
+  compass->private->point = -1;
+}
+
+static void
+gimp_tool_compass_constructed (GObject *object)
+{
+  GimpToolCompass        *compass = GIMP_TOOL_COMPASS (object);
+  GimpToolWidget         *widget  = GIMP_TOOL_WIDGET (object);
+  GimpToolCompassPrivate *private = compass->private;
+  GimpCanvasGroup        *stroke_group;
+  gint                    i;
+
+  G_OBJECT_CLASS (parent_class)->constructed (object);
+
+  stroke_group = gimp_tool_widget_add_stroke_group (widget);
+
+  gimp_tool_widget_push_group (widget, stroke_group);
+
+  private->line1 = gimp_tool_widget_add_line (widget,
+                                              private->x[0],
+                                              private->y[0],
+                                              private->x[1],
+                                              private->y[1]);
+
+  private->line2 = gimp_tool_widget_add_line (widget,
+                                              private->x[0],
+                                              private->y[0],
+                                              private->x[2],
+                                              private->y[2]);
+
+  private->arc = gimp_tool_widget_add_handle (widget,
+                                              GIMP_HANDLE_CIRCLE,
+                                              private->x[0],
+                                              private->y[0],
+                                              ARC_RADIUS * 2 + 1,
+                                              ARC_RADIUS * 2 + 1,
+                                              GIMP_HANDLE_ANCHOR_CENTER);
+
+  private->arc_line = gimp_tool_widget_add_line (widget,
+                                                 private->x[0],
+                                                 private->y[0],
+                                                 private->x[0] + 10,
+                                                 private->y[0]);
+
+  gimp_tool_widget_pop_group (widget);
+
+  for (i = 0; i < 3; i++)
+    {
+      private->handles[i] =
+        gimp_tool_widget_add_handle (widget,
+                                     i == 0 ?
+                                     GIMP_HANDLE_CIRCLE : GIMP_HANDLE_CROSS,
+                                     private->x[i],
+                                     private->y[i],
+                                     GIMP_CANVAS_HANDLE_SIZE_CROSS,
+                                     GIMP_CANVAS_HANDLE_SIZE_CROSS,
+                                     GIMP_HANDLE_ANCHOR_CENTER);
+    }
+
+  gimp_tool_compass_changed (widget);
+}
+
+static void
+gimp_tool_compass_set_property (GObject      *object,
+                                guint         property_id,
+                                const GValue *value,
+                                GParamSpec   *pspec)
+{
+  GimpToolCompass        *compass = GIMP_TOOL_COMPASS (object);
+  GimpToolCompassPrivate *private = compass->private;
+
+  switch (property_id)
+    {
+    case PROP_ORIENTATION:
+      private->orientation = g_value_get_enum (value);
+      break;
+    case PROP_N_POINTS:
+      private->n_points = g_value_get_int (value);
+      break;
+    case PROP_X1:
+      private->x[0] = g_value_get_int (value);
+      break;
+    case PROP_Y1:
+      private->y[0] = g_value_get_int (value);
+      break;
+    case PROP_X2:
+      private->x[1] = g_value_get_int (value);
+      break;
+    case PROP_Y2:
+      private->y[1] = g_value_get_int (value);
+      break;
+    case PROP_X3:
+      private->x[2] = g_value_get_int (value);
+      break;
+    case PROP_Y3:
+      private->y[2] = g_value_get_int (value);
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+      break;
+    }
+}
+
+static void
+gimp_tool_compass_get_property (GObject    *object,
+                                guint       property_id,
+                                GValue     *value,
+                                GParamSpec *pspec)
+{
+  GimpToolCompass        *compass = GIMP_TOOL_COMPASS (object);
+  GimpToolCompassPrivate *private = compass->private;
+
+  switch (property_id)
+    {
+    case PROP_ORIENTATION:
+      g_value_set_enum (value, private->orientation);
+      break;
+    case PROP_N_POINTS:
+      g_value_set_int (value, private->n_points);
+      break;
+    case PROP_X1:
+      g_value_set_int (value, private->x[0]);
+      break;
+    case PROP_Y1:
+      g_value_set_int (value, private->y[0]);
+      break;
+    case PROP_X2:
+      g_value_set_int (value, private->x[1]);
+      break;
+    case PROP_Y2:
+      g_value_set_int (value, private->y[1]);
+      break;
+    case PROP_X3:
+      g_value_set_int (value, private->x[2]);
+      break;
+    case PROP_Y3:
+      g_value_set_int (value, private->y[2]);
+      break;
+    case PROP_PIXEL_ANGLE:
+      g_value_set_double (value, private->pixel_angle);
+      break;
+    case PROP_UNIT_ANGLE:
+      g_value_set_double (value, private->unit_angle);
+      break;
+    case PROP_EFFECTIVE_ORIENTATION:
+      g_value_set_enum (value, private->effective_orientation);
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+      break;
+    }
+}
+
+static void
+gimp_tool_compass_changed (GimpToolWidget *widget)
+{
+  GimpToolCompass        *compass       = GIMP_TOOL_COMPASS (widget);
+  GimpToolCompassPrivate *private       = compass->private;
+  GimpDisplayShell       *shell         = gimp_tool_widget_get_shell (widget);
+  gdouble                 angle1;
+  gdouble                 angle2;
+  gint                    draw_arc      = 0;
+  gboolean                draw_arc_line = FALSE;
+  gdouble                 arc_line_display_length;
+  gdouble                 arc_line_length;
+
+  gimp_tool_compass_update_angle (compass, private->orientation, FALSE);
+
+  angle1 = -atan2 (private->radius1.y * shell->scale_y,
+                   private->radius1.x * shell->scale_x);
+  angle2 = -private->display_angle;
+
+  gimp_canvas_line_set (private->line1,
+                        private->x[0],
+                        private->y[0],
+                        private->x[1],
+                        private->y[1]);
+  gimp_canvas_item_set_visible (private->line1, private->n_points > 1);
+  if (private->n_points > 1 &&
+      gimp_canvas_item_transform_distance (private->line1,
+                                           private->x[0],
+                                           private->y[0],
+                                           private->x[1],
+                                           private->y[1]) > ARC_RADIUS)
+    {
+      draw_arc++;
+    }
+
+
+  arc_line_display_length = ARC_RADIUS                           +
+                            (GIMP_CANVAS_HANDLE_SIZE_CROSS >> 1) +
+                            ARC_GAP;
+  arc_line_length         = arc_line_display_length              /
+                            hypot (private->radius2.x * shell->scale_x,
+                                  private->radius2.y * shell->scale_y);
+
+  if (private->n_points > 2)
+    {
+      gdouble length = gimp_canvas_item_transform_distance (private->line2,
+                                                            private->x[0],
+                                                            private->y[0],
+                                                            private->x[2],
+                                                            private->y[2]);
+
+      if (length > ARC_RADIUS)
+        {
+          draw_arc++;
+          draw_arc_line = TRUE;
+
+          if (length > arc_line_display_length)
+            {
+              gimp_canvas_line_set (
+                private->line2,
+                private->x[0] + private->radius2.x * arc_line_length,
+                private->y[0] + private->radius2.y * arc_line_length,
+                private->x[2],
+                private->y[2]);
+              gimp_canvas_item_set_visible (private->line2, TRUE);
+            }
+          else
+            {
+              gimp_canvas_item_set_visible (private->line2, FALSE);
+            }
+        }
+      else
+        {
+          gimp_canvas_line_set (private->line2,
+                                private->x[0],
+                                private->y[0],
+                                private->x[2],
+                                private->y[2]);
+          gimp_canvas_item_set_visible (private->line2, TRUE);
+        }
+    }
+  else
+    {
+      gimp_canvas_item_set_visible (private->line2, FALSE);
+    }
+
+  gimp_canvas_handle_set_position (private->arc,
+                                   private->x[0], private->y[0]);
+  gimp_canvas_handle_set_angles (private->arc, angle1, angle2);
+  gimp_canvas_item_set_visible (private->arc,
+                                private->n_points > 1             &&
+                                draw_arc == private->n_points - 1 &&
+                                fabs (angle2) > EPSILON);
+
+  arc_line_length = (ARC_RADIUS + (GIMP_CANVAS_HANDLE_SIZE_CROSS >> 1)) /
+                    hypot (private->radius2.x * shell->scale_x,
+                           private->radius2.y * shell->scale_y);
+
+  gimp_canvas_line_set (private->arc_line,
+                        private->x[0],
+                        private->y[0],
+                        private->x[0] + private->radius2.x * arc_line_length,
+                        private->y[0] + private->radius2.y * arc_line_length);
+  gimp_canvas_item_set_visible (private->arc_line,
+                                (private->n_points == 2 || draw_arc_line) &&
+                                fabs (angle2) > EPSILON);
+
+  gimp_canvas_handle_set_position (private->handles[0],
+                                   private->x[0], private->y[0]);
+  gimp_canvas_item_set_visible (private->handles[0],
+                                private->n_points > 0);
+
+  gimp_canvas_handle_set_position (private->handles[1],
+                                   private->x[1], private->y[1]);
+  gimp_canvas_item_set_visible (private->handles[1],
+                                private->n_points > 1);
+
+  gimp_canvas_handle_set_position (private->handles[2],
+                                   private->x[2], private->y[2]);
+  gimp_canvas_item_set_visible (private->handles[2],
+                                private->n_points > 2);
+
+  gimp_tool_compass_update_hilight (compass);
+}
+
+gint
+gimp_tool_compass_button_press (GimpToolWidget      *widget,
+                                const GimpCoords    *coords,
+                                guint32              time,
+                                GdkModifierType      state,
+                                GimpButtonPressType  press_type)
+{
+  GimpToolCompass        *compass = GIMP_TOOL_COMPASS (widget);
+  GimpToolCompassPrivate *private = compass->private;
+
+  private->function = CREATING;
+
+  private->mouse_x = coords->x;
+  private->mouse_y = coords->y;
+
+  /*  if the cursor is in one of the handles, the new function will be
+   *  moving or adding a new point or guide
+   */
+  if (private->point != -1)
+    {
+      GdkModifierType extend_mask = gimp_get_extend_selection_mask ();
+      GdkModifierType toggle_mask = gimp_get_toggle_behavior_mask ();
+
+      if (state & (toggle_mask | GDK_MOD1_MASK))
+        {
+          gboolean create_hguide = (state & toggle_mask);
+          gboolean create_vguide = (state & GDK_MOD1_MASK);
+
+          g_signal_emit (compass, compass_signals[CREATE_GUIDES], 0,
+                         private->x[private->point],
+                         private->y[private->point],
+                         create_hguide,
+                         create_vguide);
+
+          private->function = GUIDING;
+        }
+      else
+        {
+          if (private->n_points == 1 || (state & extend_mask))
+            private->function = ADDING;
+          else
+            private->function = MOVING;
+        }
+    }
+
+  /*  adding to the middle point makes no sense  */
+  if (private->point    == 0      &&
+      private->function == ADDING &&
+      private->n_points == 3)
+    {
+      private->function = MOVING;
+    }
+
+  /*  if the function is still CREATING, we are outside the handles  */
+  if (private->function == CREATING)
+    {
+      if (private->n_points > 1 && (state & GDK_MOD1_MASK))
+        {
+          private->function = MOVING_ALL;
+
+          private->last_x = coords->x;
+          private->last_y = coords->y;
+        }
+    }
+
+  if (private->function == CREATING)
+    {
+      /*  set the first point and go into ADDING mode  */
+      g_object_set (compass,
+                    "n-points", 1,
+                    "x1",       (gint) (coords->x + 0.5),
+                    "y1",       (gint) (coords->y + 0.5),
+                    "x2",       0,
+                    "y2",       0,
+                    "x3",       0,
+                    "y3",       0,
+                    NULL);
+
+      private->point    = 0;
+      private->function = ADDING;
+    }
+
+  return 1;
+}
+
+void
+gimp_tool_compass_button_release (GimpToolWidget        *widget,
+                                  const GimpCoords      *coords,
+                                  guint32                time,
+                                  GdkModifierType        state,
+                                  GimpButtonReleaseType  release_type)
+{
+  GimpToolCompass        *compass = GIMP_TOOL_COMPASS (widget);
+  GimpToolCompassPrivate *private = compass->private;
+
+  private->function = FINISHED;
+}
+
+void
+gimp_tool_compass_motion (GimpToolWidget   *widget,
+                          const GimpCoords *coords,
+                          guint32           time,
+                          GdkModifierType   state)
+{
+  GimpToolCompass        *compass  = GIMP_TOOL_COMPASS (widget);
+  GimpToolCompassPrivate *private  = compass->private;
+  gint                    new_n_points;
+  gint                    new_x[3];
+  gint                    new_y[3];
+  gint                    dx, dy;
+  gint                    tmp;
+
+  private->mouse_x = coords->x;
+  private->mouse_y = coords->y;
+
+  /*  A few comments here, because this routine looks quite weird at first ...
+   *
+   *  The goal is to keep point 0, called the start point, to be
+   *  always the one in the middle or, if there are only two points,
+   *  the one that is fixed.  The angle is then always measured at
+   *  this point.
+   */
+
+  new_n_points = private->n_points;
+  new_x[0]     = private->x[0];
+  new_y[0]     = private->y[0];
+  new_x[1]     = private->x[1];
+  new_y[1]     = private->y[1];
+  new_x[2]     = private->x[2];
+  new_y[2]     = private->y[2];
+
+  switch (private->function)
+    {
+    case ADDING:
+      switch (private->point)
+        {
+        case 0:
+          /*  we are adding to the start point  */
+          break;
+
+        case 1:
+          /*  we are adding to the end point, make it the new start point  */
+          new_x[0] = private->x[1];
+          new_y[0] = private->y[1];
+
+          new_x[1] = private->x[0];
+          new_y[1] = private->y[0];
+          break;
+
+        case 2:
+          /*  we are adding to the third point, make it the new start point  */
+          new_x[1] = private->x[0];
+          new_y[1] = private->y[0];
+          new_x[0] = private->x[2];
+          new_y[0] = private->y[2];
+          break;
+
+        default:
+          break;
+        }
+
+      new_n_points = MIN (new_n_points + 1, 3);
+
+      private->point    = new_n_points - 1;
+      private->function = MOVING;
+      /*  don't break here!  */
+
+    case MOVING:
+      /*  if we are moving the start point and only have two, make it
+       *  the end point
+       */
+      if (new_n_points == 2 && private->point == 0)
+        {
+          tmp = new_x[0];
+          new_x[0] = new_x[1];
+          new_x[1] = tmp;
+
+          tmp = new_y[0];
+          new_y[0] = new_y[1];
+          new_y[1] = tmp;
+
+          private->point = 1;
+        }
+
+      new_x[private->point] = ROUND (coords->x);
+      new_y[private->point] = ROUND (coords->y);
+
+      if (state & gimp_get_constrain_behavior_mask ())
+        {
+          gdouble  x = new_x[private->point];
+          gdouble  y = new_y[private->point];
+
+          gimp_display_shell_constrain_line (gimp_tool_widget_get_shell (widget),
+                                             new_x[0], new_y[0],
+                                             &x, &y,
+                                             GIMP_CONSTRAIN_LINE_15_DEGREES);
+
+          new_x[private->point] = ROUND (x);
+          new_y[private->point] = ROUND (y);
+        }
+
+      g_object_set (compass,
+                    "n-points", new_n_points,
+                    "x1",       new_x[0],
+                    "y1",       new_y[0],
+                    "x2",       new_x[1],
+                    "y2",       new_y[1],
+                    "x3",       new_x[2],
+                    "y3",       new_y[2],
+                    NULL);
+      break;
+
+    case MOVING_ALL:
+      dx = ROUND (coords->x) - private->last_x;
+      dy = ROUND (coords->y) - private->last_y;
+
+      g_object_set (compass,
+                    "x1", new_x[0] + dx,
+                    "y1", new_y[0] + dy,
+                    "x2", new_x[1] + dx,
+                    "y2", new_y[1] + dy,
+                    "x3", new_x[2] + dx,
+                    "y3", new_y[2] + dy,
+                    NULL);
+
+      private->last_x = ROUND (coords->x);
+      private->last_y = ROUND (coords->y);
+      break;
+
+    default:
+      break;
+    }
+}
+
+GimpHit
+gimp_tool_compass_hit (GimpToolWidget   *widget,
+                       const GimpCoords *coords,
+                       GdkModifierType   state,
+                       gboolean          proximity)
+{
+  GimpToolCompass *compass = GIMP_TOOL_COMPASS (widget);
+
+  if (gimp_tool_compass_get_point (compass, coords) >= 0)
+    return GIMP_HIT_DIRECT;
+  else
+    return GIMP_HIT_INDIRECT;
+}
+
+void
+gimp_tool_compass_hover (GimpToolWidget   *widget,
+                         const GimpCoords *coords,
+                         GdkModifierType   state,
+                         gboolean          proximity)
+{
+  GimpToolCompass        *compass = GIMP_TOOL_COMPASS (widget);
+  GimpToolCompassPrivate *private = compass->private;
+  gint                    point;
+
+  private->mouse_x = coords->x;
+  private->mouse_y = coords->y;
+
+  point = gimp_tool_compass_get_point (compass, coords);
+
+  if (point >= 0)
+    {
+      GdkModifierType  extend_mask = gimp_get_extend_selection_mask ();
+      GdkModifierType  toggle_mask = gimp_get_toggle_behavior_mask ();
+      gchar           *status;
+
+      if (state & toggle_mask)
+        {
+          if (state & GDK_MOD1_MASK)
+            {
+              status = gimp_suggest_modifiers (_("Click to place "
+                                                 "vertical and "
+                                                 "horizontal guides"),
+                                               0,
+                                               NULL, NULL, NULL);
+            }
+          else
+            {
+              status = gimp_suggest_modifiers (_("Click to place a "
+                                                 "horizontal guide"),
+                                               GDK_MOD1_MASK & ~state,
+                                               NULL, NULL, NULL);
+            }
+        }
+      else if (state & GDK_MOD1_MASK)
+        {
+          status = gimp_suggest_modifiers (_("Click to place a "
+                                             "vertical guide"),
+                                           toggle_mask & ~state,
+                                           NULL, NULL, NULL);
+        }
+      else if ((state & extend_mask) &&
+               ! ((point == 0) && (private->n_points == 3)))
+        {
+          status = gimp_suggest_modifiers (_("Click-Drag to add a "
+                                             "new point"),
+                                           (toggle_mask |
+                                            GDK_MOD1_MASK) & ~state,
+                                           NULL, NULL, NULL);
+        }
+      else
+        {
+          if ((point == 0) && (private->n_points == 3))
+            state |= extend_mask;
+
+          status = gimp_suggest_modifiers (_("Click-Drag to move this "
+                                             "point"),
+                                           (extend_mask |
+                                            toggle_mask |
+                                            GDK_MOD1_MASK) & ~state,
+                                           NULL, NULL, NULL);
+        }
+
+      gimp_tool_widget_set_status (widget, status);
+
+      g_free (status);
+    }
+  else
+    {
+      if ((private->n_points > 1) && (state & GDK_MOD1_MASK))
+        {
+          gimp_tool_widget_set_status (widget,
+                                       _("Click-Drag to move all points"));
+        }
+      else
+        {
+          gimp_tool_widget_set_status (widget, NULL);
+        }
+    }
+
+  if (point != private->point)
+    {
+      private->point = point;
+
+      gimp_tool_compass_update_hilight (compass);
+    }
+}
+
+void
+gimp_tool_compass_leave_notify (GimpToolWidget *widget)
+{
+  GimpToolCompass        *compass = GIMP_TOOL_COMPASS (widget);
+  GimpToolCompassPrivate *private = compass->private;
+
+  if (private->point != -1)
+    {
+      private->point = -1;
+
+      gimp_tool_compass_update_hilight (compass);
+    }
+
+  GIMP_TOOL_WIDGET_CLASS (parent_class)->leave_notify (widget);
+}
+
+static void
+gimp_tool_compass_motion_modifier (GimpToolWidget  *widget,
+                                   GdkModifierType  key,
+                                   gboolean         press,
+                                   GdkModifierType  state)
+{
+  GimpToolCompass        *compass = GIMP_TOOL_COMPASS (widget);
+  GimpToolCompassPrivate *private = compass->private;
+
+  if (key == gimp_get_constrain_behavior_mask () &&
+      private->function == MOVING)
+    {
+      gint    new_x[3];
+      gint    new_y[3];
+      gdouble x = private->mouse_x;
+      gdouble y = private->mouse_y;
+
+      new_x[0] = private->x[0];
+      new_y[0] = private->y[0];
+      new_x[1] = private->x[1];
+      new_y[1] = private->y[1];
+      new_x[2] = private->x[2];
+      new_y[2] = private->y[2];
+
+      if (press)
+        {
+          gimp_display_shell_constrain_line (gimp_tool_widget_get_shell (widget),
+                                             private->x[0], private->y[0],
+                                             &x, &y,
+                                             GIMP_CONSTRAIN_LINE_15_DEGREES);
+        }
+
+      new_x[private->point] = ROUND (x);
+      new_y[private->point] = ROUND (y);
+
+      g_object_set (compass,
+                    "x1", new_x[0],
+                    "y1", new_y[0],
+                    "x2", new_x[1],
+                    "y2", new_y[1],
+                    "x3", new_x[2],
+                    "y3", new_y[2],
+                    NULL);
+    }
+}
+
+static gboolean
+gimp_tool_compass_get_cursor (GimpToolWidget     *widget,
+                              const GimpCoords   *coords,
+                              GdkModifierType     state,
+                              GimpCursorType     *cursor,
+                              GimpToolCursorType *tool_cursor,
+                              GimpCursorModifier *modifier)
+{
+  GimpToolCompass        *compass = GIMP_TOOL_COMPASS (widget);
+  GimpToolCompassPrivate *private = compass->private;
+
+  if (private->point != -1)
+    {
+      GdkModifierType extend_mask = gimp_get_extend_selection_mask ();
+      GdkModifierType toggle_mask = gimp_get_toggle_behavior_mask ();
+
+      if (state & toggle_mask)
+        {
+          if (state & GDK_MOD1_MASK)
+            {
+              *cursor = GIMP_CURSOR_CORNER_BOTTOM_RIGHT;
+              return TRUE;
+            }
+          else
+            {
+              *cursor = GIMP_CURSOR_SIDE_BOTTOM;
+              return TRUE;
+            }
+        }
+      else if (state & GDK_MOD1_MASK)
+        {
+          *cursor = GIMP_CURSOR_SIDE_RIGHT;
+          return TRUE;
+        }
+      else if ((state & extend_mask) &&
+               ! ((private->point == 0) &&
+                  (private->n_points == 3)))
+        {
+          *modifier = GIMP_CURSOR_MODIFIER_PLUS;
+          return TRUE;
+        }
+      else
+        {
+          *modifier = GIMP_CURSOR_MODIFIER_MOVE;
+          return TRUE;
+        }
+    }
+  else
+    {
+      if ((private->n_points > 1) && (state & GDK_MOD1_MASK))
+        {
+          *modifier = GIMP_CURSOR_MODIFIER_MOVE;
+          return TRUE;
+        }
+    }
+
+  return FALSE;
+}
+
+static gint
+gimp_tool_compass_get_point (GimpToolCompass  *compass,
+                             const GimpCoords *coords)
+{
+  GimpToolCompassPrivate *private = compass->private;
+  gint                    i;
+
+  for (i = 0; i < private->n_points; i++)
+    {
+      if (gimp_canvas_item_hit (private->handles[i],
+                                coords->x, coords->y))
+        {
+          return i;
+        }
+    }
+
+  return -1;
+}
+
+static void
+gimp_tool_compass_update_hilight (GimpToolCompass *compass)
+{
+  GimpToolCompassPrivate *private = compass->private;
+  gint                    i;
+
+  for (i = 0; i < private->n_points; i++)
+    {
+      if (private->handles[i])
+        {
+          gimp_canvas_item_set_highlight (private->handles[i],
+                                          private->point == i);
+        }
+    }
+}
+
+static void
+gimp_tool_compass_update_angle (GimpToolCompass        *compass,
+                                GimpCompassOrientation  orientation,
+                                gboolean                flip)
+{
+  GimpToolWidget         *widget  = GIMP_TOOL_WIDGET (compass);
+  GimpToolCompassPrivate *private = compass->private;
+  GimpDisplayShell       *shell   = gimp_tool_widget_get_shell (widget);
+  GimpImage              *image   = gimp_display_get_image (shell->display);
+  GimpVector2             radius1;
+  GimpVector2             radius2;
+  gdouble                 pixel_angle;
+  gdouble                 unit_angle;
+  gdouble                 xres;
+  gdouble                 yres;
+
+  gimp_image_get_resolution (image, &xres, &yres);
+
+  private->radius1.x = private->x[1] - private->x[0];
+  private->radius1.y = private->y[1] - private->y[0];
+
+  if (private->n_points == 3)
+    {
+      orientation = GIMP_COMPASS_ORIENTATION_AUTO;
+
+      private->radius2.x = private->x[2] - private->x[0];
+      private->radius2.y = private->y[2] - private->y[0];
+    }
+  else
+    {
+      gdouble angle = -shell->rotate_angle * G_PI / 180.0;
+
+      if (orientation == GIMP_COMPASS_ORIENTATION_VERTICAL)
+        angle -= G_PI / 2.0;
+
+      if (flip)
+        angle += G_PI;
+
+      if (shell->flip_horizontally)
+        angle = G_PI - angle;
+      if (shell->flip_vertically)
+        angle = -angle;
+
+      private->radius2.x = cos (angle);
+      private->radius2.y = sin (angle);
+
+      if (! shell->dot_for_dot)
+        {
+          private->radius2.x *= xres;
+          private->radius2.y *= yres;
+
+          gimp_vector2_normalize (&private->radius2);
+        }
+    }
+
+  radius1 = private->radius1;
+  radius2 = private->radius2;
+
+  pixel_angle = atan2 (gimp_vector2_cross_product (&radius1, &radius2).x,
+                       gimp_vector2_inner_product (&radius1, &radius2));
+
+  radius1.x /= xres;
+  radius1.y /= yres;
+
+  radius2.x /= xres;
+  radius2.y /= yres;
+
+  unit_angle = atan2 (gimp_vector2_cross_product (&radius1, &radius2).x,
+                      gimp_vector2_inner_product (&radius1, &radius2));
+
+  if (shell->dot_for_dot)
+    private->display_angle = pixel_angle;
+  else
+    private->display_angle = unit_angle;
+
+  if (private->n_points == 2)
+    {
+      if (! flip && fabs (private->display_angle) > G_PI / 2.0 + EPSILON)
+        {
+          gimp_tool_compass_update_angle (compass, orientation, TRUE);
+
+          return;
+        }
+      else if (orientation == GIMP_COMPASS_ORIENTATION_AUTO)
+        {
+          if (fabs (private->display_angle) <= G_PI / 4.0 + EPSILON)
+            {
+              orientation = GIMP_COMPASS_ORIENTATION_HORIZONTAL;
+            }
+          else
+            {
+              gimp_tool_compass_update_angle (compass,
+                                              GIMP_COMPASS_ORIENTATION_VERTICAL,
+                                              FALSE);
+
+              return;
+            }
+        }
+    }
+
+  if (fabs (pixel_angle - private->pixel_angle) > EPSILON)
+    {
+      private->pixel_angle = pixel_angle;
+
+      g_object_notify (G_OBJECT (compass), "pixel-angle");
+    }
+
+  if (fabs (unit_angle - private->unit_angle) > EPSILON)
+    {
+      private->unit_angle = unit_angle;
+
+      g_object_notify (G_OBJECT (compass), "unit-angle");
+    }
+
+  if (orientation != private->effective_orientation)
+    {
+      private->effective_orientation = orientation;
+
+      g_object_notify (G_OBJECT (compass), "effective-orientation");
+    }
+}
+
+
+/*  public functions  */
+
+GimpToolWidget *
+gimp_tool_compass_new (GimpDisplayShell       *shell,
+                       GimpCompassOrientation  orientation,
+                       gint                    n_points,
+                       gint                    x1,
+                       gint                    y1,
+                       gint                    x2,
+                       gint                    y2,
+                       gint                    x3,
+                       gint                    y3)
+{
+  g_return_val_if_fail (GIMP_IS_DISPLAY_SHELL (shell), NULL);
+
+  return g_object_new (GIMP_TYPE_TOOL_COMPASS,
+                       "shell",       shell,
+                       "orientation", orientation,
+                       "n-points",    n_points,
+                       "x1",          x1,
+                       "y1",          y1,
+                       "x2",          x2,
+                       "y2",          y2,
+                       NULL);
+}