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gimp/app/tools/gimpfreeselecttool.c

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/* GIMP - The GNU Image Manipulation Program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* Major improvement to support polygonal segments
* Copyright (C) 2008 Martin Nordholts
*
* 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 <string.h>
#include <gegl.h>
#include <gtk/gtk.h>
#include <gdk/gdkkeysyms.h>
#include "libgimpmath/gimpmath.h"
#include "libgimpwidgets/gimpwidgets.h"
#include "tools-types.h"
#include "core/gimp-utils.h"
#include "core/gimpchannel.h"
#include "core/gimpchannel-select.h"
#include "core/gimpimage.h"
#include "core/gimplayer-floating-sel.h"
#include "widgets/gimphelp-ids.h"
#include "widgets/gimpwidgets-utils.h"
#include "display/gimpcanvasgroup.h"
#include "display/gimpdisplay.h"
#include "gimpfreeselecttool.h"
#include "gimpselectionoptions.h"
#include "gimptoolcontrol.h"
#include "gimp-intl.h"
#define POINT_GRAB_THRESHOLD_SQ SQR (GIMP_TOOL_HANDLE_SIZE_CIRCLE / 2)
#define POINT_SHOW_THRESHOLD_SQ SQR (GIMP_TOOL_HANDLE_SIZE_CIRCLE * 7)
#define N_ITEMS_PER_ALLOC 1024
#define INVALID_INDEX (-1)
#define NO_CLICK_TIME_AVAILABLE 0
#define GET_PRIVATE(fst) \
(G_TYPE_INSTANCE_GET_PRIVATE ((fst), \
GIMP_TYPE_FREE_SELECT_TOOL, GimpFreeSelectToolPrivate))
typedef struct
{
/* Index of grabbed segment index. */
gint grabbed_segment_index;
/* We need to keep track of a number of points when we move a
* segment vertex
*/
GimpVector2 *saved_points_lower_segment;
GimpVector2 *saved_points_higher_segment;
gint max_n_saved_points_lower_segment;
gint max_n_saved_points_higher_segment;
/* Keeps track whether or not a modification of the polygon has been
* made between _button_press and _button_release
*/
gboolean polygon_modified;
/* Point which is used to draw the polygon but which is not part of
* it yet
*/
GimpVector2 pending_point;
gboolean show_pending_point;
/* The points of the polygon */
GimpVector2 *points;
gint max_n_points;
/* The number of points actually in use */
gint n_points;
/* Any int array containing the indices for the points in the
* polygon that connects different segments together
*/
gint *segment_indices;
gint max_n_segment_indices;
/* The number of segment indices actually in use */
gint n_segment_indices;
/* The selection operation active when the tool was started */
GimpChannelOps operation_at_start;
/* Whether or not to constrain the angle for newly created polygonal
* segments.
*/
gboolean constrain_angle;
/* Whether or not to suppress handles (so that new segments can be
* created immediately after an existing segment vertex.
*/
gboolean supress_handles;
/* Last _oper_update or _motion coords */
GimpVector2 last_coords;
/* A double-click commits the selection, keep track of last
* click-time and click-position.
*/
guint32 last_click_time;
GimpCoords last_click_coord;
} GimpFreeSelectToolPrivate;
static void gimp_free_select_tool_finalize (GObject *object);
static void gimp_free_select_tool_control (GimpTool *tool,
GimpToolAction action,
GimpDisplay *display);
static void gimp_free_select_tool_oper_update (GimpTool *tool,
const GimpCoords *coords,
GdkModifierType state,
gboolean proximity,
GimpDisplay *display);
static void gimp_free_select_tool_cursor_update (GimpTool *tool,
const GimpCoords *coords,
GdkModifierType state,
GimpDisplay *display);
static void gimp_free_select_tool_button_press (GimpTool *tool,
const GimpCoords *coords,
guint32 time,
GdkModifierType state,
GimpButtonPressType press_type,
GimpDisplay *display);
static void gimp_free_select_tool_button_release (GimpTool *tool,
const GimpCoords *coords,
guint32 time,
GdkModifierType state,
GimpButtonReleaseType release_type,
GimpDisplay *display);
static void gimp_free_select_tool_motion (GimpTool *tool,
const GimpCoords *coords,
guint32 time,
GdkModifierType state,
GimpDisplay *display);
static gboolean gimp_free_select_tool_key_press (GimpTool *tool,
GdkEventKey *kevent,
GimpDisplay *display);
static void gimp_free_select_tool_modifier_key (GimpTool *tool,
GdkModifierType key,
gboolean press,
GdkModifierType state,
GimpDisplay *display);
static void gimp_free_select_tool_active_modifier_key (GimpTool *tool,
GdkModifierType key,
gboolean press,
GdkModifierType state,
GimpDisplay *display);
static void gimp_free_select_tool_draw (GimpDrawTool *draw_tool);
static void gimp_free_select_tool_real_select (GimpFreeSelectTool *fst,
GimpDisplay *display);
G_DEFINE_TYPE (GimpFreeSelectTool, gimp_free_select_tool,
GIMP_TYPE_SELECTION_TOOL);
#define parent_class gimp_free_select_tool_parent_class
static const GimpVector2 vector2_zero = { 0.0, 0.0 };
void
gimp_free_select_tool_register (GimpToolRegisterCallback callback,
gpointer data)
{
(* callback) (GIMP_TYPE_FREE_SELECT_TOOL,
GIMP_TYPE_SELECTION_OPTIONS,
gimp_selection_options_gui,
0,
"gimp-free-select-tool",
_("Free Select"),
_("Free Select Tool: Select a hand-drawn region with free and polygonal segments"),
N_("_Free Select"), "F",
NULL, GIMP_HELP_TOOL_FREE_SELECT,
GIMP_STOCK_TOOL_FREE_SELECT,
data);
}
static void
gimp_free_select_tool_class_init (GimpFreeSelectToolClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GimpToolClass *tool_class = GIMP_TOOL_CLASS (klass);
GimpDrawToolClass *draw_tool_class = GIMP_DRAW_TOOL_CLASS (klass);
object_class->finalize = gimp_free_select_tool_finalize;
tool_class->control = gimp_free_select_tool_control;
tool_class->oper_update = gimp_free_select_tool_oper_update;
tool_class->cursor_update = gimp_free_select_tool_cursor_update;
tool_class->button_press = gimp_free_select_tool_button_press;
tool_class->button_release = gimp_free_select_tool_button_release;
tool_class->motion = gimp_free_select_tool_motion;
tool_class->key_press = gimp_free_select_tool_key_press;
tool_class->modifier_key = gimp_free_select_tool_modifier_key;
tool_class->active_modifier_key = gimp_free_select_tool_active_modifier_key;
draw_tool_class->draw = gimp_free_select_tool_draw;
klass->select = gimp_free_select_tool_real_select;
g_type_class_add_private (klass, sizeof (GimpFreeSelectToolPrivate));
}
static void
gimp_free_select_tool_init (GimpFreeSelectTool *fst)
{
GimpTool *tool = GIMP_TOOL (fst);
GimpFreeSelectToolPrivate *priv = GET_PRIVATE (fst);
gimp_tool_control_set_motion_mode (tool->control, GIMP_MOTION_MODE_EXACT);
gimp_tool_control_set_wants_click (tool->control, TRUE);
gimp_tool_control_set_precision (tool->control,
GIMP_CURSOR_PRECISION_SUBPIXEL);
gimp_tool_control_set_tool_cursor (tool->control,
GIMP_TOOL_CURSOR_FREE_SELECT);
priv->grabbed_segment_index = INVALID_INDEX;
priv->saved_points_lower_segment = NULL;
priv->saved_points_higher_segment = NULL;
priv->max_n_saved_points_lower_segment = 0;
priv->max_n_saved_points_higher_segment = 0;
priv->polygon_modified = FALSE;
priv->show_pending_point = FALSE;
priv->points = NULL;
priv->n_points = 0;
priv->max_n_points = 0;
priv->segment_indices = NULL;
priv->n_segment_indices = 0;
priv->max_n_segment_indices = 0;
priv->constrain_angle = FALSE;
priv->supress_handles = FALSE;
priv->last_click_time = NO_CLICK_TIME_AVAILABLE;
}
static void
gimp_free_select_tool_finalize (GObject *object)
{
GimpFreeSelectTool *fst = GIMP_FREE_SELECT_TOOL (object);
GimpFreeSelectToolPrivate *priv = GET_PRIVATE (fst);
g_free (priv->points);
g_free (priv->segment_indices);
g_free (priv->saved_points_lower_segment);
g_free (priv->saved_points_higher_segment);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
gimp_free_select_tool_get_segment (GimpFreeSelectTool *fst,
GimpVector2 **points,
gint *n_points,
gint segment_start,
gint segment_end)
{
GimpFreeSelectToolPrivate *priv = GET_PRIVATE (fst);
*points = &priv->points[priv->segment_indices[segment_start]];
*n_points = priv->segment_indices[segment_end] -
priv->segment_indices[segment_start] +
1;
}
static void
gimp_free_select_tool_get_segment_point (GimpFreeSelectTool *fst,
gdouble *start_point_x,
gdouble *start_point_y,
gint segment_index)
{
GimpFreeSelectToolPrivate *priv = GET_PRIVATE (fst);
*start_point_x = priv->points[priv->segment_indices[segment_index]].x;
*start_point_y = priv->points[priv->segment_indices[segment_index]].y;
}
static void
gimp_free_select_tool_get_last_point (GimpFreeSelectTool *fst,
gdouble *start_point_x,
gdouble *start_point_y)
{
GimpFreeSelectToolPrivate *priv = GET_PRIVATE (fst);
gimp_free_select_tool_get_segment_point (fst,
start_point_x,
start_point_y,
priv->n_segment_indices - 1);
}
static void
gimp_free_select_tool_get_double_click_settings (gint *double_click_time,
gint *double_click_distance)
{
GdkScreen *screen = gdk_screen_get_default ();
if (screen != NULL)
{
GtkSettings *settings = gtk_settings_get_for_screen (screen);
g_object_get (settings,
"gtk-double-click-time", double_click_time,
"gtk-double-click-distance", double_click_distance,
NULL);
}
}
static gboolean
gimp_free_select_tool_should_close (GimpFreeSelectTool *fst,
GimpDisplay *display,
guint32 time,
const GimpCoords *coords)
{
GimpFreeSelectToolPrivate *priv = GET_PRIVATE (fst);
gboolean double_click = FALSE;
gdouble dist = G_MAXDOUBLE;
if (priv->polygon_modified ||
priv->n_segment_indices <= 0 ||
GIMP_TOOL (fst)->display == NULL)
return FALSE;
dist = gimp_draw_tool_calc_distance_square (GIMP_DRAW_TOOL (fst),
display,
coords->x,
coords->y,
priv->points[0].x,
priv->points[0].y);
/* Handle double-click. It must be within GTK+ global double-click
* time since last click, and it must be within GTK+ global
* double-click distance away from the last point
*/
if (time != NO_CLICK_TIME_AVAILABLE)
{
gint double_click_time;
gint double_click_distance;
gint click_time_passed;
gdouble dist_from_last_point;
click_time_passed = time - priv->last_click_time;
dist_from_last_point =
gimp_draw_tool_calc_distance_square (GIMP_DRAW_TOOL (fst),
display,
coords->x,
coords->y,
priv->last_click_coord.x,
priv->last_click_coord.y);
gimp_free_select_tool_get_double_click_settings (&double_click_time,
&double_click_distance);
double_click = click_time_passed < double_click_time &&
dist_from_last_point < double_click_distance;
}
return ((! priv->supress_handles && dist < POINT_GRAB_THRESHOLD_SQ) ||
double_click);
}
static void
gimp_free_select_tool_handle_segment_selection (GimpFreeSelectTool *fst,
GimpDisplay *display,
const GimpCoords *coords)
{
GimpFreeSelectToolPrivate *priv = GET_PRIVATE (fst);
GimpDrawTool *draw_tool = GIMP_DRAW_TOOL (fst);
gdouble shortest_dist = POINT_GRAB_THRESHOLD_SQ;
gint grabbed_segment_index = INVALID_INDEX;
gint i;
if (GIMP_TOOL (fst)->display != NULL &&
! priv->supress_handles)
{
for (i = 0; i < priv->n_segment_indices; i++)
{
gdouble dist;
GimpVector2 *point;
point = &priv->points[priv->segment_indices[i]];
dist = gimp_draw_tool_calc_distance_square (draw_tool,
display,
coords->x,
coords->y,
point->x,
point->y);
if (dist < shortest_dist)
{
grabbed_segment_index = i;
}
}
}
if (grabbed_segment_index != priv->grabbed_segment_index)
{
gimp_draw_tool_pause (draw_tool);
priv->grabbed_segment_index = grabbed_segment_index;
gimp_draw_tool_resume (draw_tool);
}
}
static void
gimp_free_select_tool_revert_to_last_segment (GimpFreeSelectTool *fst)
{
GimpFreeSelectToolPrivate *priv = GET_PRIVATE (fst);
priv->n_points = priv->segment_indices[priv->n_segment_indices - 1] + 1;
}
static void
gimp_free_select_tool_remove_last_segment (GimpFreeSelectTool *fst)
{
GimpFreeSelectToolPrivate *priv = GET_PRIVATE (fst);
GimpDrawTool *draw_tool = GIMP_DRAW_TOOL (fst);
gimp_draw_tool_pause (draw_tool);
if (priv->n_segment_indices > 0)
priv->n_segment_indices--;
if (priv->n_segment_indices <= 0)
{
gimp_tool_control (GIMP_TOOL (fst), GIMP_TOOL_ACTION_HALT,
GIMP_TOOL (fst)->display);
}
else
{
gimp_free_select_tool_revert_to_last_segment (fst);
}
gimp_draw_tool_resume (draw_tool);
}
static void
gimp_free_select_tool_add_point (GimpFreeSelectTool *fst,
gdouble x,
gdouble y)
{
GimpFreeSelectToolPrivate *priv = GET_PRIVATE (fst);
if (priv->n_points >= priv->max_n_points)
{
priv->max_n_points += N_ITEMS_PER_ALLOC;
priv->points = g_realloc (priv->points,
sizeof (GimpVector2) * priv->max_n_points);
}
priv->points[priv->n_points].x = x;
priv->points[priv->n_points].y = y;
priv->n_points++;
}
static void
gimp_free_select_tool_add_segment_index (GimpFreeSelectTool *fst,
gint index)
{
GimpFreeSelectToolPrivate *priv = GET_PRIVATE (fst);
if (priv->n_segment_indices >= priv->max_n_segment_indices)
{
priv->max_n_segment_indices += N_ITEMS_PER_ALLOC;
priv->segment_indices = g_realloc (priv->segment_indices,
sizeof (GimpVector2) *
priv->max_n_segment_indices);
}
priv->segment_indices[priv->n_segment_indices] = index;
priv->n_segment_indices++;
}
static gboolean
gimp_free_select_tool_is_point_grabbed (GimpFreeSelectTool *fst)
{
GimpFreeSelectToolPrivate *priv = GET_PRIVATE (fst);
return priv->grabbed_segment_index != INVALID_INDEX;
}
static void
gimp_free_select_tool_fit_segment (GimpFreeSelectTool *fst,
GimpVector2 *dest_points,
GimpVector2 dest_start_target,
GimpVector2 dest_end_target,
const GimpVector2 *source_points,
gint n_points)
{
GimpVector2 origo_translation_offset;
GimpVector2 untranslation_offset;
gdouble rotation;
gdouble scale;
/* Handle some quick special cases */
if (n_points <= 0)
{
return;
}
else if (n_points == 1)
{
dest_points[0] = dest_end_target;
return;
}
else if (n_points == 2)
{
dest_points[0] = dest_start_target;
dest_points[1] = dest_end_target;
return;
}
/* Copy from source to dest; we work on the dest data */
memcpy (dest_points, source_points, sizeof (GimpVector2) * n_points);
/* Transform the destination end point */
{
GimpVector2 *dest_end;
GimpVector2 origo_translated_end_target;
gdouble target_rotation;
gdouble current_rotation;
gdouble target_length;
gdouble current_length;
dest_end = &dest_points[n_points - 1];
/* Transate to origin */
gimp_vector2_sub (&origo_translation_offset,
&vector2_zero,
&dest_points[0]);
gimp_vector2_add (dest_end,
dest_end,
&origo_translation_offset);
/* Calculate origo_translated_end_target */
gimp_vector2_sub (&origo_translated_end_target,
&dest_end_target,
&dest_start_target);
/* Rotate */
target_rotation = atan2 (vector2_zero.y - origo_translated_end_target.y,
vector2_zero.x - origo_translated_end_target.x);
current_rotation = atan2 (vector2_zero.y - dest_end->y,
vector2_zero.x - dest_end->x);
rotation = current_rotation - target_rotation;
gimp_vector2_rotate (dest_end, rotation);
/* Scale */
target_length = gimp_vector2_length (&origo_translated_end_target);
current_length = gimp_vector2_length (dest_end);
scale = target_length / current_length;
gimp_vector2_mul (dest_end, scale);
/* Untranslate */
gimp_vector2_sub (&untranslation_offset,
&dest_end_target,
dest_end);
gimp_vector2_add (dest_end,
dest_end,
&untranslation_offset);
}
/* Do the same transformation for the rest of the points */
{
gint i;
for (i = 0; i < n_points - 1; i++)
{
/* Translate */
gimp_vector2_add (&dest_points[i],
&origo_translation_offset,
&dest_points[i]);
/* Rotate */
gimp_vector2_rotate (&dest_points[i],
rotation);
/* Scale */
gimp_vector2_mul (&dest_points[i],
scale);
/* Untranslate */
gimp_vector2_add (&dest_points[i],
&dest_points[i],
&untranslation_offset);
}
}
}
static void
gimp_free_select_tool_move_segment_vertex_to (GimpFreeSelectTool *fst,
gint segment_index,
gdouble new_x,
gdouble new_y)
{
GimpFreeSelectToolPrivate *priv = GET_PRIVATE (fst);
GimpVector2 cursor_point = { new_x, new_y };
GimpVector2 *dest;
GimpVector2 *dest_start_target;
GimpVector2 *dest_end_target;
gint n_points;
/* Handle the segment before the grabbed point */
if (segment_index > 0)
{
gimp_free_select_tool_get_segment (fst,
&dest,
&n_points,
priv->grabbed_segment_index - 1,
priv->grabbed_segment_index);
dest_start_target = &dest[0];
dest_end_target = &cursor_point;
gimp_free_select_tool_fit_segment (fst,
dest,
*dest_start_target,
*dest_end_target,
priv->saved_points_lower_segment,
n_points);
}
/* Handle the segment after the grabbed point */
if (segment_index < priv->n_segment_indices - 1)
{
gimp_free_select_tool_get_segment (fst,
&dest,
&n_points,
priv->grabbed_segment_index,
priv->grabbed_segment_index + 1);
dest_start_target = &cursor_point;
dest_end_target = &dest[n_points - 1];
gimp_free_select_tool_fit_segment (fst,
dest,
*dest_start_target,
*dest_end_target,
priv->saved_points_higher_segment,
n_points);
}
/* Handle when there only is one point */
if (segment_index == 0 &&
priv->n_segment_indices == 1)
{
priv->points[0].x = new_x;
priv->points[0].y = new_y;
}
}
/**
* gimp_free_select_tool_finish_line_segment:
* @free_ploy_sel_tool:
* @end_x:
* @end_y:
*
* Adds a line segment. Also cancels a pending free segment if any.
**/
static void
gimp_free_select_tool_finish_line_segment (GimpFreeSelectTool *fst)
{
/* Revert any free segment points that might have been added */
gimp_free_select_tool_revert_to_last_segment (fst);
}
/**
* gimp_free_select_tool_finish_free_segment:
* @fst:
*
* Finnishes off the creation of a free segment.
**/
static void
gimp_free_select_tool_finish_free_segment (GimpFreeSelectTool *fst)
{
GimpFreeSelectToolPrivate *priv = GET_PRIVATE (fst);
/* The points are all setup, just make a segment */
gimp_free_select_tool_add_segment_index (fst,
priv->n_points - 1);
}
static void
gimp_free_select_tool_commit (GimpFreeSelectTool *fst,
GimpDisplay *display)
{
GimpFreeSelectToolPrivate *priv = GET_PRIVATE (fst);
if (priv->n_points >= 3)
{
gimp_free_select_tool_select (fst, display);
}
gimp_image_flush (gimp_display_get_image (display));
}
static void
gimp_free_select_tool_revert_to_saved_state (GimpFreeSelectTool *fst)
{
GimpFreeSelectToolPrivate *priv = GET_PRIVATE (fst);
GimpVector2 *dest;
gint n_points;
/* Without a point grab we have no sensible information to fall back
* on, bail out
*/
if (! gimp_free_select_tool_is_point_grabbed (fst))
{
return;
}
if (priv->grabbed_segment_index > 0)
{
gimp_free_select_tool_get_segment (fst,
&dest,
&n_points,
priv->grabbed_segment_index - 1,
priv->grabbed_segment_index);
memcpy (dest,
priv->saved_points_lower_segment,
sizeof (GimpVector2) * n_points);
}
if (priv->grabbed_segment_index < priv->n_segment_indices - 1)
{
gimp_free_select_tool_get_segment (fst,
&dest,
&n_points,
priv->grabbed_segment_index,
priv->grabbed_segment_index + 1);
memcpy (dest,
priv->saved_points_higher_segment,
sizeof (GimpVector2) * n_points);
}
if (priv->grabbed_segment_index == 0 &&
priv->n_segment_indices == 1)
{
priv->points[0] = *priv->saved_points_lower_segment;
}
}
static void
gimp_free_select_tool_handle_click (GimpFreeSelectTool *fst,
const GimpCoords *coords,
guint32 time,
GimpDisplay *display)
{
GimpFreeSelectToolPrivate *priv = GET_PRIVATE (fst);
GimpImage *image = gimp_display_get_image (display);
/* If there is a floating selection, anchor it */
if (gimp_image_get_floating_selection (image))
{
floating_sel_anchor (gimp_image_get_floating_selection (image));
gimp_tool_control (GIMP_TOOL (fst), GIMP_TOOL_ACTION_HALT, display);
}
else
{
/* First finish of the line segment if no point was grabbed */
if (! gimp_free_select_tool_is_point_grabbed (fst))
{
gimp_free_select_tool_finish_line_segment (fst);
}
/* After the segments are up to date and we have handled
* double-click, see if it's committing time
*/
if (gimp_free_select_tool_should_close (fst,
display,
time,
coords))
{
/* We can get a click notification even though the end point
* has been moved a few pixels. Since a move will change the
* free selection, revert it before doing the commit.
*/
gimp_free_select_tool_revert_to_saved_state (fst);
gimp_free_select_tool_commit (fst, display);
}
priv->last_click_time = time;
priv->last_click_coord = *coords;
}
}
static void
gimp_free_select_tool_handle_normal_release (GimpFreeSelectTool *fst,
const GimpCoords *coords,
GimpDisplay *display)
{
/* First finish of the free segment if no point was grabbed */
if (! gimp_free_select_tool_is_point_grabbed (fst))
{
gimp_free_select_tool_finish_free_segment (fst);
}
/* After the segments are up to date, see if it's committing time */
if (gimp_free_select_tool_should_close (fst,
display,
NO_CLICK_TIME_AVAILABLE,
coords))
{
gimp_free_select_tool_commit (fst, display);
}
}
static void
gimp_free_select_tool_handle_cancel (GimpFreeSelectTool *fst)
{
if (gimp_free_select_tool_is_point_grabbed (fst))
{
gimp_free_select_tool_revert_to_saved_state (fst);
}
else
{
gimp_free_select_tool_remove_last_segment (fst);
}
}
void
gimp_free_select_tool_select (GimpFreeSelectTool *fst,
GimpDisplay *display)
{
g_return_if_fail (GIMP_IS_FREE_SELECT_TOOL (fst));
g_return_if_fail (GIMP_IS_DISPLAY (display));
GIMP_FREE_SELECT_TOOL_GET_CLASS (fst)->select (fst,
display);
}
static void
gimp_free_select_tool_prepare_for_move (GimpFreeSelectTool *fst)
{
GimpFreeSelectToolPrivate *priv = GET_PRIVATE (fst);
GimpVector2 *source;
gint n_points;
if (priv->grabbed_segment_index > 0)
{
gimp_free_select_tool_get_segment (fst,
&source,
&n_points,
priv->grabbed_segment_index - 1,
priv->grabbed_segment_index);
if (n_points > priv->max_n_saved_points_lower_segment)
{
priv->max_n_saved_points_lower_segment = n_points;
priv->saved_points_lower_segment = g_realloc (priv->saved_points_lower_segment,
sizeof (GimpVector2) *
n_points);
}
memcpy (priv->saved_points_lower_segment,
source,
sizeof (GimpVector2) * n_points);
}
if (priv->grabbed_segment_index < priv->n_segment_indices - 1)
{
gimp_free_select_tool_get_segment (fst,
&source,
&n_points,
priv->grabbed_segment_index,
priv->grabbed_segment_index + 1);
if (n_points > priv->max_n_saved_points_higher_segment)
{
priv->max_n_saved_points_higher_segment = n_points;
priv->saved_points_higher_segment = g_realloc (priv->saved_points_higher_segment,
sizeof (GimpVector2) * n_points);
}
memcpy (priv->saved_points_higher_segment,
source,
sizeof (GimpVector2) * n_points);
}
/* A special-case when there only is one point */
if (priv->grabbed_segment_index == 0 &&
priv->n_segment_indices == 1)
{
if (priv->max_n_saved_points_lower_segment == 0)
{
priv->max_n_saved_points_lower_segment = 1;
priv->saved_points_lower_segment = g_new0 (GimpVector2, 1);
}
*priv->saved_points_lower_segment = priv->points[0];
}
}
static void
gimp_free_select_tool_update_motion (GimpFreeSelectTool *fst,
gdouble new_x,
gdouble new_y)
{
GimpFreeSelectToolPrivate *priv = GET_PRIVATE (fst);
if (gimp_free_select_tool_is_point_grabbed (fst))
{
priv->polygon_modified = TRUE;
if (priv->constrain_angle &&
priv->n_segment_indices > 1 )
{
gdouble start_point_x;
gdouble start_point_y;
gint segment_index;
/* Base constraints on the last segment vertex if we move
* the first one, otherwise base on the previous segment
* vertex
*/
if (priv->grabbed_segment_index == 0)
{
segment_index = priv->n_segment_indices - 1;
}
else
{
segment_index = priv->grabbed_segment_index - 1;
}
gimp_free_select_tool_get_segment_point (fst,
&start_point_x,
&start_point_y,
segment_index);
gimp_constrain_line (start_point_x,
start_point_y,
&new_x,
&new_y,
GIMP_CONSTRAIN_LINE_15_DEGREES);
}
gimp_free_select_tool_move_segment_vertex_to (fst,
priv->grabbed_segment_index,
new_x,
new_y);
/* We also must update the pending point if we are moving the
* first point
*/
if (priv->grabbed_segment_index == 0)
{
priv->pending_point.x = new_x;
priv->pending_point.y = new_y;
}
}
else
{
/* Don't show the pending point while we are adding points */
priv->show_pending_point = FALSE;
gimp_free_select_tool_add_point (fst,
new_x,
new_y);
}
}
static void
gimp_free_select_tool_status_update (GimpFreeSelectTool *fst,
GimpDisplay *display,
const GimpCoords *coords,
gboolean proximity)
{
GimpTool *tool = GIMP_TOOL (fst);
GimpFreeSelectToolPrivate *priv = GET_PRIVATE (fst);
gimp_tool_pop_status (tool, display);
if (proximity)
{
const gchar *status_text = NULL;
if (gimp_free_select_tool_is_point_grabbed (fst))
{
if (gimp_free_select_tool_should_close (fst,
display,
NO_CLICK_TIME_AVAILABLE,
coords))
{
status_text = _("Click to complete selection");
}
else
{
status_text = _("Click-Drag to move segment vertex");
}
}
else if (priv->n_segment_indices >= 3)
{
status_text = _("Return commits, Escape cancels, Backspace removes last segment");
}
else
{
status_text = _("Click-Drag adds a free segment, Click adds a polygonal segment");
}
if (status_text)
{
gimp_tool_push_status (tool, display, "%s", status_text);
}
}
}
static void
gimp_free_select_tool_control (GimpTool *tool,
GimpToolAction action,
GimpDisplay *display)
{
GimpFreeSelectTool *fst = GIMP_FREE_SELECT_TOOL (tool);
GimpFreeSelectToolPrivate *priv = GET_PRIVATE (fst);
switch (action)
{
case GIMP_TOOL_ACTION_PAUSE:
case GIMP_TOOL_ACTION_RESUME:
break;
case GIMP_TOOL_ACTION_HALT:
priv->grabbed_segment_index = INVALID_INDEX;
priv->show_pending_point = FALSE;
priv->n_points = 0;
priv->n_segment_indices = 0;
break;
case GIMP_TOOL_ACTION_COMMIT:
break;
}
GIMP_TOOL_CLASS (parent_class)->control (tool, action, display);
}
static void
gimp_free_select_tool_oper_update (GimpTool *tool,
const GimpCoords *coords,
GdkModifierType state,
gboolean proximity,
GimpDisplay *display)
{
GimpFreeSelectTool *fst = GIMP_FREE_SELECT_TOOL (tool);
GimpFreeSelectToolPrivate *priv = GET_PRIVATE (fst);
gboolean hovering_first_point;
gimp_free_select_tool_handle_segment_selection (fst,
display,
coords);
hovering_first_point =
gimp_free_select_tool_should_close (fst,
display,
NO_CLICK_TIME_AVAILABLE,
coords);
gimp_draw_tool_pause (GIMP_DRAW_TOOL (tool));
priv->last_coords.x = coords->x;
priv->last_coords.y = coords->y;
if (priv->n_points == 0 ||
(gimp_free_select_tool_is_point_grabbed (fst) &&
! hovering_first_point) ||
! proximity)
{
priv->show_pending_point = FALSE;
}
else
{
priv->show_pending_point = TRUE;
if (hovering_first_point)
{
priv->pending_point = priv->points[0];
}
else
{
priv->pending_point.x = coords->x;
priv->pending_point.y = coords->y;
if (priv->constrain_angle && priv->n_points > 0)
{
gdouble start_point_x;
gdouble start_point_y;
gimp_free_select_tool_get_last_point (fst,
&start_point_x,
&start_point_y);
gimp_constrain_line (start_point_x, start_point_y,
&priv->pending_point.x,
&priv->pending_point.y,
GIMP_CONSTRAIN_LINE_15_DEGREES);
}
}
}
gimp_draw_tool_resume (GIMP_DRAW_TOOL (tool));
if (tool->display == NULL)
{
GIMP_TOOL_CLASS (parent_class)->oper_update (tool,
coords,
state,
proximity,
display);
}
else
{
gimp_free_select_tool_status_update (fst, display, coords, proximity);
}
}
static void
gimp_free_select_tool_cursor_update (GimpTool *tool,
const GimpCoords *coords,
GdkModifierType state,
GimpDisplay *display)
{
GimpFreeSelectTool *fst = GIMP_FREE_SELECT_TOOL (tool);
if (tool->display == NULL)
{
GIMP_TOOL_CLASS (parent_class)->cursor_update (tool,
coords,
state,
display);
}
else
{
GimpCursorModifier modifier;
if (gimp_free_select_tool_is_point_grabbed (fst) &&
! gimp_free_select_tool_should_close (fst,
display,
NO_CLICK_TIME_AVAILABLE,
coords))
{
modifier = GIMP_CURSOR_MODIFIER_MOVE;
}
else
{
modifier = GIMP_CURSOR_MODIFIER_NONE;
}
gimp_tool_set_cursor (tool, display,
gimp_tool_control_get_cursor (tool->control),
gimp_tool_control_get_tool_cursor (tool->control),
modifier);
}
}
static void
gimp_free_select_tool_button_press (GimpTool *tool,
const GimpCoords *coords,
guint32 time,
GdkModifierType state,
GimpButtonPressType press_type,
GimpDisplay *display)
{
GimpDrawTool *draw_tool = GIMP_DRAW_TOOL (tool);
GimpFreeSelectTool *fst = GIMP_FREE_SELECT_TOOL (tool);
GimpFreeSelectToolPrivate *priv = GET_PRIVATE (fst);
GimpSelectionOptions *options = GIMP_SELECTION_TOOL_GET_OPTIONS (tool);
if (tool->display && tool->display != display)
gimp_tool_control (tool, GIMP_TOOL_ACTION_HALT, display);
if (tool->display == NULL)
{
/* First of all handle delegation to the selection mask edit logic
* if appropriate.
*/
if (gimp_selection_tool_start_edit (GIMP_SELECTION_TOOL (fst),
display, coords))
{
return;
}
tool->display = display;
/* We want to apply the selection operation that was current when
* the tool was started, so we save this information
*/
priv->operation_at_start = options->operation;
}
if (! gimp_draw_tool_is_active (draw_tool))
gimp_draw_tool_start (draw_tool, display);
gimp_tool_control_activate (tool->control);
gimp_draw_tool_pause (draw_tool);
if (gimp_free_select_tool_is_point_grabbed (fst))
{
gimp_free_select_tool_prepare_for_move (fst);
}
else
{
GimpVector2 point_to_add;
/* Note that we add the pending point (unless it is the first
* point we add) because the pending point is setup correctly
* with regards to angle constraints.
*/
if (priv->n_points > 0)
{
point_to_add = priv->pending_point;
}
else
{
point_to_add.x = coords->x;
point_to_add.y = coords->y;
}
/* No point was grabbed, add a new point and mark this as a
* segment divider. For a line segment, this will be the only
* new point. For a free segment, this will be the first point
* of the free segment.
*/
gimp_free_select_tool_add_point (fst,
point_to_add.x,
point_to_add.y);
gimp_free_select_tool_add_segment_index (fst,
priv->n_points - 1);
}
gimp_draw_tool_resume (draw_tool);
}
static void
gimp_free_select_tool_button_release (GimpTool *tool,
const GimpCoords *coords,
guint32 time,
GdkModifierType state,
GimpButtonReleaseType release_type,
GimpDisplay *display)
{
GimpFreeSelectTool *fst = GIMP_FREE_SELECT_TOOL (tool);
GimpFreeSelectToolPrivate *priv = GET_PRIVATE (fst);
gimp_tool_control_halt (tool->control);
gimp_draw_tool_pause (GIMP_DRAW_TOOL (fst));
switch (release_type)
{
case GIMP_BUTTON_RELEASE_CLICK:
case GIMP_BUTTON_RELEASE_NO_MOTION:
/* If a click was made, we don't consider the polygon modified */
priv->polygon_modified = FALSE;
gimp_free_select_tool_handle_click (fst,
coords,
time,
display);
break;
case GIMP_BUTTON_RELEASE_NORMAL:
gimp_free_select_tool_handle_normal_release (fst,
coords,
display);
break;
case GIMP_BUTTON_RELEASE_CANCEL:
gimp_free_select_tool_handle_cancel (fst);
break;
default:
break;
}
/* Reset */
priv->polygon_modified = FALSE;
gimp_draw_tool_resume (GIMP_DRAW_TOOL (fst));
}
static void
gimp_free_select_tool_motion (GimpTool *tool,
const GimpCoords *coords,
guint32 time,
GdkModifierType state,
GimpDisplay *display)
{
GimpFreeSelectTool *fst = GIMP_FREE_SELECT_TOOL (tool);
GimpFreeSelectToolPrivate *priv = GET_PRIVATE (fst);
GimpDrawTool *draw_tool = GIMP_DRAW_TOOL (tool);
gimp_draw_tool_pause (draw_tool);
priv->last_coords.x = coords->x;
priv->last_coords.y = coords->y;
gimp_free_select_tool_update_motion (fst,
coords->x,
coords->y);
gimp_draw_tool_resume (draw_tool);
}
static gboolean
gimp_free_select_tool_key_press (GimpTool *tool,
GdkEventKey *kevent,
GimpDisplay *display)
{
GimpFreeSelectTool *fst = GIMP_FREE_SELECT_TOOL (tool);
switch (kevent->keyval)
{
case GDK_KEY_BackSpace:
gimp_free_select_tool_remove_last_segment (fst);
return TRUE;
case GDK_KEY_Return:
case GDK_KEY_KP_Enter:
case GDK_KEY_ISO_Enter:
gimp_free_select_tool_commit (fst, display);
return TRUE;
case GDK_KEY_Escape:
gimp_tool_control (tool, GIMP_TOOL_ACTION_HALT, display);
return TRUE;
default:
break;
}
return FALSE;
}
static void
gimp_free_select_tool_modifier_key (GimpTool *tool,
GdkModifierType key,
gboolean press,
GdkModifierType state,
GimpDisplay *display)
{
GimpDrawTool *draw_tool = GIMP_DRAW_TOOL (tool);
GimpFreeSelectToolPrivate *priv = GET_PRIVATE (tool);
if (tool->display == display)
{
gimp_draw_tool_pause (draw_tool);
priv->constrain_angle = ((state & gimp_get_constrain_behavior_mask ()) ?
TRUE : FALSE);
priv->supress_handles = state & GDK_SHIFT_MASK ? TRUE : FALSE;
gimp_draw_tool_resume (draw_tool);
}
GIMP_TOOL_CLASS (parent_class)->modifier_key (tool,
key,
press,
state,
display);
}
static void
gimp_free_select_tool_active_modifier_key (GimpTool *tool,
GdkModifierType key,
gboolean press,
GdkModifierType state,
GimpDisplay *display)
{
GimpDrawTool *draw_tool = GIMP_DRAW_TOOL (tool);
GimpFreeSelectToolPrivate *priv = GET_PRIVATE (tool);
if (tool->display != display)
return;
gimp_draw_tool_pause (draw_tool);
priv->constrain_angle = ((state & gimp_get_constrain_behavior_mask ()) ?
TRUE : FALSE);
/* If we didn't came here due to a mouse release, immediately update
* the position of the thing we move.
*/
if (state & GDK_BUTTON1_MASK)
{
gimp_free_select_tool_update_motion (GIMP_FREE_SELECT_TOOL (tool),
priv->last_coords.x,
priv->last_coords.y);
}
gimp_draw_tool_resume (draw_tool);
GIMP_TOOL_CLASS (parent_class)->active_modifier_key (tool,
key,
press,
state,
display);
}
/**
* gimp_free_select_tool_draw:
* @draw_tool:
*
* Draw the line segments and handles around segment vertices, the
* latter if the they are in proximity to cursor.
**/
static void
gimp_free_select_tool_draw (GimpDrawTool *draw_tool)
{
GimpFreeSelectTool *fst = GIMP_FREE_SELECT_TOOL (draw_tool);
GimpFreeSelectToolPrivate *priv = GET_PRIVATE (fst);
GimpTool *tool = GIMP_TOOL (draw_tool);
GimpCanvasGroup *stroke_group;
gboolean hovering_first_point = FALSE;
gboolean handles_wants_to_show = FALSE;
GimpCoords coords = { priv->last_coords.x,
priv->last_coords.y,
/* pad with 0 */ };
if (! tool->display)
return;
hovering_first_point =
gimp_free_select_tool_should_close (fst,
tool->display,
NO_CLICK_TIME_AVAILABLE,
&coords);
stroke_group = gimp_draw_tool_add_stroke_group (draw_tool);
gimp_draw_tool_push_group (draw_tool, stroke_group);
gimp_draw_tool_add_lines (draw_tool,
priv->points, priv->n_points,
FALSE);
gimp_draw_tool_pop_group (draw_tool);
/* We always show the handle for the first point, even with button1
* down, since releasing the button on the first point will close
* the polygon, so it's a significant state which we must give
* feedback for
*/
handles_wants_to_show = (hovering_first_point ||
! gimp_tool_control_is_active (tool->control));
if (handles_wants_to_show &&
! priv->supress_handles)
{
gint i = 0;
gint n = 0;
/* If the first point is hovered while button1 is held down,
* only draw the first handle, the other handles are not
* relevant (see comment a few lines up)
*/
if (gimp_tool_control_is_active (tool->control) && hovering_first_point)
n = MIN (priv->n_segment_indices, 1);
else
n = priv->n_segment_indices;
for (i = 0; i < n; i++)
{
GimpVector2 *point = NULL;
gdouble dist = 0.0;
GimpHandleType handle_type = -1;
point = &priv->points[priv->segment_indices[i]];
dist = gimp_draw_tool_calc_distance_square (draw_tool,
tool->display,
priv->last_coords.x,
priv->last_coords.y,
point->x,
point->y);
/* If the cursor is over the point, fill, if it's just
* close, draw an outline
*/
if (dist < POINT_GRAB_THRESHOLD_SQ)
handle_type = GIMP_HANDLE_FILLED_CIRCLE;
else if (dist < POINT_SHOW_THRESHOLD_SQ)
handle_type = GIMP_HANDLE_CIRCLE;
if (handle_type != -1)
{
GimpCanvasItem *item;
item = gimp_draw_tool_add_handle (draw_tool, handle_type,
point->x,
point->y,
GIMP_TOOL_HANDLE_SIZE_CIRCLE,
GIMP_TOOL_HANDLE_SIZE_CIRCLE,
GIMP_HANDLE_ANCHOR_CENTER);
if (dist < POINT_GRAB_THRESHOLD_SQ)
gimp_canvas_item_set_highlight (item, TRUE);
}
}
}
if (priv->show_pending_point)
{
GimpVector2 last = priv->points[priv->n_points - 1];
gimp_draw_tool_push_group (draw_tool, stroke_group);
gimp_draw_tool_add_line (draw_tool,
last.x,
last.y,
priv->pending_point.x,
priv->pending_point.y);
gimp_draw_tool_pop_group (draw_tool);
}
}
static void
gimp_free_select_tool_real_select (GimpFreeSelectTool *fst,
GimpDisplay *display)
{
GimpSelectionOptions *options = GIMP_SELECTION_TOOL_GET_OPTIONS (fst);
GimpFreeSelectToolPrivate *priv = GET_PRIVATE (fst);
GimpImage *image = gimp_display_get_image (display);
gimp_channel_select_polygon (gimp_image_get_mask (image),
C_("command", "Free Select"),
priv->n_points,
priv->points,
priv->operation_at_start,
options->antialias,
options->feather,
options->feather_radius,
options->feather_radius,
TRUE);
gimp_tool_control (GIMP_TOOL (fst), GIMP_TOOL_ACTION_HALT, display);
}
void
gimp_free_select_tool_get_points (GimpFreeSelectTool *fst,
const GimpVector2 **points,
gint *n_points)
{
GimpFreeSelectToolPrivate *priv = GET_PRIVATE (fst);
g_return_if_fail (points != NULL && n_points != NULL);
*points = priv->points;
*n_points = priv->n_points;
}
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