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PIKApp/app/display/pikatoolline.c

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/* PIKA - Photo and Image Kooker Application
* a rebranding of The GNU Image Manipulation Program (created with heckimp)
* A derived work which may be trivial. However, any changes may be (C)2023 by Aldercone Studio
*
* Original copyright, applying to most contents (license remains unchanged):
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* pikatoolline.c
* Copyright (C) 2017 Michael Natterer <mitch@gimp.org>
*
* Major improvements for interactivity
* Copyright (C) 2014 Michael Henning <drawoc@darkrefraction.com>
*
* 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 <gdk/gdkkeysyms.h>
#include "libpikabase/pikabase.h"
#include "libpikamath/pikamath.h"
#include "display-types.h"
#include "core/pika-utils.h"
#include "core/pikamarshal.h"
#include "widgets/pikawidgets-utils.h"
#include "pikacanvasgroup.h"
#include "pikacanvashandle.h"
#include "pikacanvasline.h"
#include "pikadisplayshell.h"
#include "pikadisplayshell-cursor.h"
#include "pikadisplayshell-utils.h"
#include "pikatoolline.h"
#include "pika-intl.h"
#define SHOW_LINE TRUE
#define GRAB_LINE_MASK GDK_MOD1_MASK
#define ENDPOINT_HANDLE_TYPE PIKA_HANDLE_CROSS
#define ENDPOINT_HANDLE_SIZE PIKA_CANVAS_HANDLE_SIZE_CROSS
#define SLIDER_HANDLE_TYPE PIKA_HANDLE_FILLED_DIAMOND
#define SLIDER_HANDLE_SIZE (ENDPOINT_HANDLE_SIZE * 2 / 3)
#define HANDLE_CIRCLE_SCALE 1.8
#define LINE_VICINITY ((gint) (SLIDER_HANDLE_SIZE * HANDLE_CIRCLE_SCALE) / 2)
#define SLIDER_TEAR_DISTANCE (5 * LINE_VICINITY)
/* hover-only "handles" */
#define HOVER_NEW_SLIDER (PIKA_TOOL_LINE_HANDLE_NONE - 1)
typedef enum
{
GRAB_NONE,
GRAB_SELECTION,
GRAB_LINE
} PikaToolLineGrab;
enum
{
PROP_0,
PROP_X1,
PROP_Y1,
PROP_X2,
PROP_Y2,
PROP_SLIDERS,
PROP_SELECTION,
PROP_STATUS_TITLE,
};
enum
{
CAN_ADD_SLIDER,
ADD_SLIDER,
PREPARE_TO_REMOVE_SLIDER,
REMOVE_SLIDER,
SELECTION_CHANGED,
HANDLE_CLICKED,
LAST_SIGNAL
};
struct _PikaToolLinePrivate
{
gdouble x1;
gdouble y1;
gdouble x2;
gdouble y2;
GArray *sliders;
gint selection;
gchar *status_title;
gdouble saved_x1;
gdouble saved_y1;
gdouble saved_x2;
gdouble saved_y2;
gdouble saved_slider_value;
gdouble mouse_x;
gdouble mouse_y;
gint hover;
gdouble new_slider_value;
gboolean remove_slider;
PikaToolLineGrab grab;
PikaCanvasItem *line;
PikaCanvasItem *start_handle;
PikaCanvasItem *end_handle;
PikaCanvasItem *slider_group;
GArray *slider_handles;
PikaCanvasItem *handle_circle;
};
/* local function prototypes */
static void pika_tool_line_constructed (GObject *object);
static void pika_tool_line_finalize (GObject *object);
static void pika_tool_line_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec);
static void pika_tool_line_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec);
static void pika_tool_line_changed (PikaToolWidget *widget);
static void pika_tool_line_focus_changed (PikaToolWidget *widget);
static gint pika_tool_line_button_press (PikaToolWidget *widget,
const PikaCoords *coords,
guint32 time,
GdkModifierType state,
PikaButtonPressType press_type);
static void pika_tool_line_button_release (PikaToolWidget *widget,
const PikaCoords *coords,
guint32 time,
GdkModifierType state,
PikaButtonReleaseType release_type);
static void pika_tool_line_motion (PikaToolWidget *widget,
const PikaCoords *coords,
guint32 time,
GdkModifierType state);
static PikaHit pika_tool_line_hit (PikaToolWidget *widget,
const PikaCoords *coords,
GdkModifierType state,
gboolean proximity);
static void pika_tool_line_hover (PikaToolWidget *widget,
const PikaCoords *coords,
GdkModifierType state,
gboolean proximity);
static void pika_tool_line_leave_notify (PikaToolWidget *widget);
static gboolean pika_tool_line_key_press (PikaToolWidget *widget,
GdkEventKey *kevent);
static void pika_tool_line_motion_modifier (PikaToolWidget *widget,
GdkModifierType key,
gboolean press,
GdkModifierType state);
static gboolean pika_tool_line_get_cursor (PikaToolWidget *widget,
const PikaCoords *coords,
GdkModifierType state,
PikaCursorType *cursor,
PikaToolCursorType *tool_cursor,
PikaCursorModifier *modifier);
static gint pika_tool_line_get_hover (PikaToolLine *line,
const PikaCoords *coords,
GdkModifierType state);
static PikaControllerSlider *
pika_tool_line_get_slider (PikaToolLine *line,
gint slider);
static PikaCanvasItem *
pika_tool_line_get_handle (PikaToolLine *line,
gint handle);
static gdouble pika_tool_line_project_point (PikaToolLine *line,
gdouble x,
gdouble y,
gboolean constrain,
gdouble *dist);
static gboolean
pika_tool_line_selection_motion (PikaToolLine *line,
gboolean constrain);
static void pika_tool_line_update_handles (PikaToolLine *line);
static void pika_tool_line_update_circle (PikaToolLine *line);
static void pika_tool_line_update_hilight (PikaToolLine *line);
static void pika_tool_line_update_status (PikaToolLine *line,
GdkModifierType state,
gboolean proximity);
static gboolean pika_tool_line_handle_hit (PikaCanvasItem *handle,
gdouble x,
gdouble y,
gdouble *min_dist);
G_DEFINE_TYPE_WITH_PRIVATE (PikaToolLine, pika_tool_line, PIKA_TYPE_TOOL_WIDGET)
#define parent_class pika_tool_line_parent_class
static guint line_signals[LAST_SIGNAL] = { 0, };
static void
pika_tool_line_class_init (PikaToolLineClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
PikaToolWidgetClass *widget_class = PIKA_TOOL_WIDGET_CLASS (klass);
object_class->constructed = pika_tool_line_constructed;
object_class->finalize = pika_tool_line_finalize;
object_class->set_property = pika_tool_line_set_property;
object_class->get_property = pika_tool_line_get_property;
widget_class->changed = pika_tool_line_changed;
widget_class->focus_changed = pika_tool_line_focus_changed;
widget_class->button_press = pika_tool_line_button_press;
widget_class->button_release = pika_tool_line_button_release;
widget_class->motion = pika_tool_line_motion;
widget_class->hit = pika_tool_line_hit;
widget_class->hover = pika_tool_line_hover;
widget_class->leave_notify = pika_tool_line_leave_notify;
widget_class->key_press = pika_tool_line_key_press;
widget_class->motion_modifier = pika_tool_line_motion_modifier;
widget_class->get_cursor = pika_tool_line_get_cursor;
line_signals[CAN_ADD_SLIDER] =
g_signal_new ("can-add-slider",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (PikaToolLineClass, can_add_slider),
NULL, NULL,
pika_marshal_BOOLEAN__DOUBLE,
G_TYPE_BOOLEAN, 1,
G_TYPE_DOUBLE);
line_signals[ADD_SLIDER] =
g_signal_new ("add-slider",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (PikaToolLineClass, add_slider),
NULL, NULL,
pika_marshal_INT__DOUBLE,
G_TYPE_INT, 1,
G_TYPE_DOUBLE);
line_signals[PREPARE_TO_REMOVE_SLIDER] =
g_signal_new ("prepare-to-remove-slider",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_FIRST,
G_STRUCT_OFFSET (PikaToolLineClass, prepare_to_remove_slider),
NULL, NULL,
pika_marshal_VOID__INT_BOOLEAN,
G_TYPE_NONE, 2,
G_TYPE_INT,
G_TYPE_BOOLEAN);
line_signals[REMOVE_SLIDER] =
g_signal_new ("remove-slider",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_FIRST,
G_STRUCT_OFFSET (PikaToolLineClass, remove_slider),
NULL, NULL, NULL,
G_TYPE_NONE, 1,
G_TYPE_INT);
line_signals[SELECTION_CHANGED] =
g_signal_new ("selection-changed",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_FIRST,
G_STRUCT_OFFSET (PikaToolLineClass, selection_changed),
NULL, NULL, NULL,
G_TYPE_NONE, 0);
line_signals[HANDLE_CLICKED] =
g_signal_new ("handle-clicked",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (PikaToolLineClass, handle_clicked),
NULL, NULL,
pika_marshal_BOOLEAN__INT_UINT_ENUM,
G_TYPE_BOOLEAN, 3,
G_TYPE_INT,
G_TYPE_UINT,
PIKA_TYPE_BUTTON_PRESS_TYPE);
g_object_class_install_property (object_class, PROP_X1,
g_param_spec_double ("x1", NULL, NULL,
-PIKA_MAX_IMAGE_SIZE,
PIKA_MAX_IMAGE_SIZE, 0,
PIKA_PARAM_READWRITE |
G_PARAM_CONSTRUCT));
g_object_class_install_property (object_class, PROP_Y1,
g_param_spec_double ("y1", NULL, NULL,
-PIKA_MAX_IMAGE_SIZE,
PIKA_MAX_IMAGE_SIZE, 0,
PIKA_PARAM_READWRITE |
G_PARAM_CONSTRUCT));
g_object_class_install_property (object_class, PROP_X2,
g_param_spec_double ("x2", NULL, NULL,
-PIKA_MAX_IMAGE_SIZE,
PIKA_MAX_IMAGE_SIZE, 0,
PIKA_PARAM_READWRITE |
G_PARAM_CONSTRUCT));
g_object_class_install_property (object_class, PROP_Y2,
g_param_spec_double ("y2", NULL, NULL,
-PIKA_MAX_IMAGE_SIZE,
PIKA_MAX_IMAGE_SIZE, 0,
PIKA_PARAM_READWRITE |
G_PARAM_CONSTRUCT));
g_object_class_install_property (object_class, PROP_SLIDERS,
g_param_spec_boxed ("sliders", NULL, NULL,
G_TYPE_ARRAY,
PIKA_PARAM_READWRITE));
g_object_class_install_property (object_class, PROP_SELECTION,
g_param_spec_int ("selection", NULL, NULL,
PIKA_TOOL_LINE_HANDLE_NONE,
G_MAXINT,
PIKA_TOOL_LINE_HANDLE_NONE,
PIKA_PARAM_READWRITE |
G_PARAM_CONSTRUCT));
g_object_class_install_property (object_class, PROP_STATUS_TITLE,
g_param_spec_string ("status-title",
NULL, NULL,
_("Line: "),
PIKA_PARAM_READWRITE |
G_PARAM_CONSTRUCT));
}
static void
pika_tool_line_init (PikaToolLine *line)
{
PikaToolLinePrivate *private;
private = line->private = pika_tool_line_get_instance_private (line);
private->sliders = g_array_new (FALSE, FALSE, sizeof (PikaControllerSlider));
private->selection = PIKA_TOOL_LINE_HANDLE_NONE;
private->hover = PIKA_TOOL_LINE_HANDLE_NONE;
private->grab = GRAB_NONE;
private->slider_handles = g_array_new (FALSE, TRUE,
sizeof (PikaCanvasItem *));
}
static void
pika_tool_line_constructed (GObject *object)
{
PikaToolLine *line = PIKA_TOOL_LINE (object);
PikaToolWidget *widget = PIKA_TOOL_WIDGET (object);
PikaToolLinePrivate *private = line->private;
G_OBJECT_CLASS (parent_class)->constructed (object);
private->line = pika_tool_widget_add_line (widget,
private->x1,
private->y1,
private->x2,
private->y2);
pika_canvas_item_set_visible (private->line, SHOW_LINE);
private->start_handle =
pika_tool_widget_add_handle (widget,
ENDPOINT_HANDLE_TYPE,
private->x1,
private->y1,
ENDPOINT_HANDLE_SIZE,
ENDPOINT_HANDLE_SIZE,
PIKA_HANDLE_ANCHOR_CENTER);
private->end_handle =
pika_tool_widget_add_handle (widget,
ENDPOINT_HANDLE_TYPE,
private->x2,
private->y2,
ENDPOINT_HANDLE_SIZE,
ENDPOINT_HANDLE_SIZE,
PIKA_HANDLE_ANCHOR_CENTER);
private->slider_group =
pika_canvas_group_new (pika_tool_widget_get_shell (widget));
pika_tool_widget_add_item (widget, private->slider_group);
g_object_unref (private->slider_group);
private->handle_circle =
pika_tool_widget_add_handle (widget,
PIKA_HANDLE_CIRCLE,
private->x1,
private->y1,
ENDPOINT_HANDLE_SIZE * HANDLE_CIRCLE_SCALE,
ENDPOINT_HANDLE_SIZE * HANDLE_CIRCLE_SCALE,
PIKA_HANDLE_ANCHOR_CENTER);
pika_tool_line_changed (widget);
}
static void
pika_tool_line_finalize (GObject *object)
{
PikaToolLine *line = PIKA_TOOL_LINE (object);
PikaToolLinePrivate *private = line->private;
g_clear_pointer (&private->sliders, g_array_unref);
g_clear_pointer (&private->status_title, g_free);
g_clear_pointer (&private->slider_handles, g_array_unref);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
pika_tool_line_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec)
{
PikaToolLine *line = PIKA_TOOL_LINE (object);
PikaToolLinePrivate *private = line->private;
switch (property_id)
{
case PROP_X1:
private->x1 = g_value_get_double (value);
break;
case PROP_Y1:
private->y1 = g_value_get_double (value);
break;
case PROP_X2:
private->x2 = g_value_get_double (value);
break;
case PROP_Y2:
private->y2 = g_value_get_double (value);
break;
case PROP_SLIDERS:
{
GArray *sliders = g_value_dup_boxed (value);
gboolean deselect;
g_return_if_fail (sliders != NULL);
deselect =
PIKA_TOOL_LINE_HANDLE_IS_SLIDER (private->selection) &&
(sliders->len != private->sliders->len ||
! pika_tool_line_get_slider (line, private->selection)->selectable);
g_array_unref (private->sliders);
private->sliders = sliders;
if (PIKA_TOOL_LINE_HANDLE_IS_SLIDER (private->hover))
private->hover = PIKA_TOOL_LINE_HANDLE_NONE;
if (deselect)
pika_tool_line_set_selection (line, PIKA_TOOL_LINE_HANDLE_NONE);
}
break;
case PROP_SELECTION:
{
gint selection = g_value_get_int (value);
g_return_if_fail (selection < (gint) private->sliders->len);
g_return_if_fail (selection < 0 ||
pika_tool_line_get_slider (line,
selection)->selectable);
if (selection != private->selection)
{
private->selection = selection;
if (private->grab == GRAB_SELECTION)
private->grab = GRAB_NONE;
g_signal_emit (line, line_signals[SELECTION_CHANGED], 0);
}
}
break;
case PROP_STATUS_TITLE:
g_free (private->status_title);
private->status_title = g_value_dup_string (value);
if (! private->status_title)
private->status_title = g_strdup (_("Line: "));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
pika_tool_line_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec)
{
PikaToolLine *line = PIKA_TOOL_LINE (object);
PikaToolLinePrivate *private = line->private;
switch (property_id)
{
case PROP_X1:
g_value_set_double (value, private->x1);
break;
case PROP_Y1:
g_value_set_double (value, private->y1);
break;
case PROP_X2:
g_value_set_double (value, private->x2);
break;
case PROP_Y2:
g_value_set_double (value, private->y2);
break;
case PROP_SLIDERS:
g_value_set_boxed (value, private->sliders);
break;
case PROP_SELECTION:
g_value_set_int (value, private->selection);
break;
case PROP_STATUS_TITLE:
g_value_set_string (value, private->status_title);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
pika_tool_line_changed (PikaToolWidget *widget)
{
PikaToolLine *line = PIKA_TOOL_LINE (widget);
PikaToolLinePrivate *private = line->private;
gint i;
pika_canvas_line_set (private->line,
private->x1,
private->y1,
private->x2,
private->y2);
pika_canvas_handle_set_position (private->start_handle,
private->x1,
private->y1);
pika_canvas_handle_set_position (private->end_handle,
private->x2,
private->y2);
/* remove excessive slider handles */
for (i = private->sliders->len; i < private->slider_handles->len; i++)
{
pika_canvas_group_remove_item (PIKA_CANVAS_GROUP (private->slider_group),
pika_tool_line_get_handle (line, i));
}
g_array_set_size (private->slider_handles, private->sliders->len);
for (i = 0; i < private->sliders->len; i++)
{
gdouble value;
gdouble x;
gdouble y;
PikaCanvasItem **handle;
value = pika_tool_line_get_slider (line, i)->value;
x = private->x1 + (private->x2 - private->x1) * value;
y = private->y1 + (private->y2 - private->y1) * value;
handle = &g_array_index (private->slider_handles, PikaCanvasItem *, i);
if (*handle)
{
pika_canvas_handle_set_position (*handle, x, y);
}
else
{
*handle = pika_canvas_handle_new (pika_tool_widget_get_shell (widget),
SLIDER_HANDLE_TYPE,
PIKA_HANDLE_ANCHOR_CENTER,
x,
y,
SLIDER_HANDLE_SIZE,
SLIDER_HANDLE_SIZE);
pika_canvas_group_add_item (PIKA_CANVAS_GROUP (private->slider_group),
*handle);
g_object_unref (*handle);
}
}
pika_tool_line_update_handles (line);
pika_tool_line_update_circle (line);
pika_tool_line_update_hilight (line);
}
static void
pika_tool_line_focus_changed (PikaToolWidget *widget)
{
PikaToolLine *line = PIKA_TOOL_LINE (widget);
pika_tool_line_update_hilight (line);
}
gboolean
pika_tool_line_button_press (PikaToolWidget *widget,
const PikaCoords *coords,
guint32 time,
GdkModifierType state,
PikaButtonPressType press_type)
{
PikaToolLine *line = PIKA_TOOL_LINE (widget);
PikaToolLinePrivate *private = line->private;
gboolean result = FALSE;
private->grab = GRAB_NONE;
private->remove_slider = FALSE;
private->saved_x1 = private->x1;
private->saved_y1 = private->y1;
private->saved_x2 = private->x2;
private->saved_y2 = private->y2;
if (press_type != PIKA_BUTTON_PRESS_NORMAL &&
private->hover > PIKA_TOOL_LINE_HANDLE_NONE &&
private->selection > PIKA_TOOL_LINE_HANDLE_NONE)
{
g_signal_emit (line, line_signals[HANDLE_CLICKED], 0,
private->selection, state, press_type, &result);
if (! result)
pika_tool_widget_hover (widget, coords, state, TRUE);
}
if (press_type == PIKA_BUTTON_PRESS_NORMAL || ! result)
{
private->saved_x1 = private->x1;
private->saved_y1 = private->y1;
private->saved_x2 = private->x2;
private->saved_y2 = private->y2;
if (PIKA_TOOL_LINE_HANDLE_IS_SLIDER (private->hover))
{
private->saved_slider_value =
pika_tool_line_get_slider (line, private->hover)->value;
}
if (private->hover > PIKA_TOOL_LINE_HANDLE_NONE)
{
pika_tool_line_set_selection (line, private->hover);
private->grab = GRAB_SELECTION;
}
else if (private->hover == HOVER_NEW_SLIDER)
{
gint slider;
g_signal_emit (line, line_signals[ADD_SLIDER], 0,
private->new_slider_value, &slider);
g_return_val_if_fail (slider < (gint) private->sliders->len, FALSE);
if (slider >= 0)
{
pika_tool_line_set_selection (line, slider);
private->saved_slider_value =
pika_tool_line_get_slider (line, private->selection)->value;
private->grab = GRAB_SELECTION;
}
}
else if (state & GRAB_LINE_MASK)
{
private->grab = GRAB_LINE;
}
result = (private->grab != GRAB_NONE);
}
if (! result)
{
private->hover = PIKA_TOOL_LINE_HANDLE_NONE;
pika_tool_line_set_selection (line, PIKA_TOOL_LINE_HANDLE_NONE);
}
pika_tool_line_update_handles (line);
pika_tool_line_update_circle (line);
pika_tool_line_update_status (line, state, TRUE);
return result;
}
void
pika_tool_line_button_release (PikaToolWidget *widget,
const PikaCoords *coords,
guint32 time,
GdkModifierType state,
PikaButtonReleaseType release_type)
{
PikaToolLine *line = PIKA_TOOL_LINE (widget);
PikaToolLinePrivate *private = line->private;
PikaToolLineGrab grab = private->grab;
private->grab = GRAB_NONE;
if (release_type == PIKA_BUTTON_RELEASE_CANCEL)
{
if (grab != GRAB_NONE)
{
if (grab == GRAB_SELECTION &&
PIKA_TOOL_LINE_HANDLE_IS_SLIDER (private->selection))
{
pika_tool_line_get_slider (line, private->selection)->value =
private->saved_slider_value;
if (private->remove_slider)
{
private->remove_slider = FALSE;
g_signal_emit (line, line_signals[PREPARE_TO_REMOVE_SLIDER], 0,
private->selection, FALSE);
}
}
g_object_set (line,
"x1", private->saved_x1,
"y1", private->saved_y1,
"x2", private->saved_x2,
"y2", private->saved_y2,
NULL);
}
}
else if (grab == GRAB_SELECTION)
{
if (private->remove_slider)
{
private->remove_slider = FALSE;
g_signal_emit (line, line_signals[REMOVE_SLIDER], 0,
private->selection);
}
else if (release_type == PIKA_BUTTON_RELEASE_CLICK)
{
gboolean result;
g_signal_emit (line, line_signals[HANDLE_CLICKED], 0,
private->selection, state, PIKA_BUTTON_PRESS_NORMAL,
&result);
}
}
}
void
pika_tool_line_motion (PikaToolWidget *widget,
const PikaCoords *coords,
guint32 time,
GdkModifierType state)
{
PikaToolLine *line = PIKA_TOOL_LINE (widget);
PikaToolLinePrivate *private = line->private;
gdouble diff_x = coords->x - private->mouse_x;
gdouble diff_y = coords->y - private->mouse_y;
private->mouse_x = coords->x;
private->mouse_y = coords->y;
if (private->grab == GRAB_LINE)
{
g_object_set (line,
"x1", private->x1 + diff_x,
"y1", private->y1 + diff_y,
"x2", private->x2 + diff_x,
"y2", private->y2 + diff_y,
NULL);
}
else
{
gboolean constrain = (state & pika_get_constrain_behavior_mask ()) != 0;
pika_tool_line_selection_motion (line, constrain);
}
pika_tool_line_update_status (line, state, TRUE);
}
PikaHit
pika_tool_line_hit (PikaToolWidget *widget,
const PikaCoords *coords,
GdkModifierType state,
gboolean proximity)
{
PikaToolLine *line = PIKA_TOOL_LINE (widget);
if (! (state & GRAB_LINE_MASK))
{
gint hover = pika_tool_line_get_hover (line, coords, state);
if (hover != PIKA_TOOL_LINE_HANDLE_NONE)
return PIKA_HIT_DIRECT;
}
else
{
return PIKA_HIT_INDIRECT;
}
return PIKA_HIT_NONE;
}
void
pika_tool_line_hover (PikaToolWidget *widget,
const PikaCoords *coords,
GdkModifierType state,
gboolean proximity)
{
PikaToolLine *line = PIKA_TOOL_LINE (widget);
PikaToolLinePrivate *private = line->private;
private->mouse_x = coords->x;
private->mouse_y = coords->y;
if (! (state & GRAB_LINE_MASK))
private->hover = pika_tool_line_get_hover (line, coords, state);
else
private->hover = PIKA_TOOL_LINE_HANDLE_NONE;
pika_tool_line_update_handles (line);
pika_tool_line_update_circle (line);
pika_tool_line_update_status (line, state, proximity);
}
static void
pika_tool_line_leave_notify (PikaToolWidget *widget)
{
PikaToolLine *line = PIKA_TOOL_LINE (widget);
PikaToolLinePrivate *private = line->private;
private->hover = PIKA_TOOL_LINE_HANDLE_NONE;
pika_tool_line_update_handles (line);
pika_tool_line_update_circle (line);
PIKA_TOOL_WIDGET_CLASS (parent_class)->leave_notify (widget);
}
static gboolean
pika_tool_line_key_press (PikaToolWidget *widget,
GdkEventKey *kevent)
{
PikaToolLine *line = PIKA_TOOL_LINE (widget);
PikaToolLinePrivate *private = line->private;
PikaDisplayShell *shell;
gdouble pixels = 1.0;
gboolean move_line;
move_line = kevent->state & GRAB_LINE_MASK;
if (private->selection == PIKA_TOOL_LINE_HANDLE_NONE && ! move_line)
return PIKA_TOOL_WIDGET_CLASS (parent_class)->key_press (widget, kevent);
shell = pika_tool_widget_get_shell (widget);
if (kevent->state & pika_get_extend_selection_mask ())
pixels = 10.0;
if (kevent->state & pika_get_toggle_behavior_mask ())
pixels = 50.0;
switch (kevent->keyval)
{
case GDK_KEY_Left:
case GDK_KEY_Right:
case GDK_KEY_Up:
case GDK_KEY_Down:
/* move an endpoint (or both endpoints) */
if (private->selection < 0 || move_line)
{
gdouble xdist, ydist;
gdouble dx, dy;
xdist = FUNSCALEX (shell, pixels);
ydist = FUNSCALEY (shell, pixels);
dx = 0.0;
dy = 0.0;
switch (kevent->keyval)
{
case GDK_KEY_Left: dx = -xdist; break;
case GDK_KEY_Right: dx = +xdist; break;
case GDK_KEY_Up: dy = -ydist; break;
case GDK_KEY_Down: dy = +ydist; break;
}
if (private->selection == PIKA_TOOL_LINE_HANDLE_START || move_line)
{
g_object_set (line,
"x1", private->x1 + dx,
"y1", private->y1 + dy,
NULL);
}
if (private->selection == PIKA_TOOL_LINE_HANDLE_END || move_line)
{
g_object_set (line,
"x2", private->x2 + dx,
"y2", private->y2 + dy,
NULL);
}
}
/* move a slider */
else
{
PikaControllerSlider *slider;
gdouble dist;
gdouble dvalue;
slider = pika_tool_line_get_slider (line, private->selection);
if (! slider->movable)
break;
dist = pika_canvas_item_transform_distance (private->line,
private->x1, private->y1,
private->x2, private->y2);
if (dist > 0.0)
dist = pixels / dist;
dvalue = 0.0;
switch (kevent->keyval)
{
case GDK_KEY_Left:
if (private->x1 < private->x2) dvalue = -dist;
else if (private->x1 > private->x2) dvalue = +dist;
break;
case GDK_KEY_Right:
if (private->x1 < private->x2) dvalue = +dist;
else if (private->x1 > private->x2) dvalue = -dist;
break;
case GDK_KEY_Up:
if (private->y1 < private->y2) dvalue = -dist;
else if (private->y1 > private->y2) dvalue = +dist;
break;
case GDK_KEY_Down:
if (private->y1 < private->y2) dvalue = +dist;
else if (private->y1 > private->y2) dvalue = -dist;
break;
}
if (dvalue != 0.0)
{
slider->value += dvalue;
slider->value = CLAMP (slider->value, slider->min, slider->max);
slider->value = CLAMP (slider->value, 0.0, 1.0);
g_object_set (line,
"sliders", private->sliders,
NULL);
}
}
return TRUE;
case GDK_KEY_BackSpace:
case GDK_KEY_Delete:
if (PIKA_TOOL_LINE_HANDLE_IS_SLIDER (private->selection))
{
if (pika_tool_line_get_slider (line, private->selection)->removable)
{
g_signal_emit (line, line_signals[REMOVE_SLIDER], 0,
private->selection);
}
}
return TRUE;
}
return PIKA_TOOL_WIDGET_CLASS (parent_class)->key_press (widget, kevent);
}
static void
pika_tool_line_motion_modifier (PikaToolWidget *widget,
GdkModifierType key,
gboolean press,
GdkModifierType state)
{
PikaToolLine *line = PIKA_TOOL_LINE (widget);
if (key == pika_get_constrain_behavior_mask ())
{
pika_tool_line_selection_motion (line, press);
pika_tool_line_update_status (line, state, TRUE);
}
}
static gboolean
pika_tool_line_get_cursor (PikaToolWidget *widget,
const PikaCoords *coords,
GdkModifierType state,
PikaCursorType *cursor,
PikaToolCursorType *tool_cursor,
PikaCursorModifier *modifier)
{
PikaToolLine *line = PIKA_TOOL_LINE (widget);
PikaToolLinePrivate *private = line->private;
if (private->grab ==GRAB_LINE || (state & GRAB_LINE_MASK))
{
*modifier = PIKA_CURSOR_MODIFIER_MOVE;
return TRUE;
}
else if (private->grab == GRAB_SELECTION ||
private->hover > PIKA_TOOL_LINE_HANDLE_NONE)
{
const PikaControllerSlider *slider = NULL;
if (private->grab == GRAB_SELECTION)
{
if (PIKA_TOOL_LINE_HANDLE_IS_SLIDER (private->selection))
slider = pika_tool_line_get_slider (line, private->selection);
}
else if (PIKA_TOOL_LINE_HANDLE_IS_SLIDER (private->hover))
{
slider = pika_tool_line_get_slider (line, private->hover);
}
if (private->grab == GRAB_SELECTION && slider && private->remove_slider)
{
*modifier = PIKA_CURSOR_MODIFIER_MINUS;
return TRUE;
}
else if (! slider || slider->movable)
{
*modifier = PIKA_CURSOR_MODIFIER_MOVE;
return TRUE;
}
}
else if (private->hover == HOVER_NEW_SLIDER)
{
*modifier = PIKA_CURSOR_MODIFIER_PLUS;
return TRUE;
}
return FALSE;
}
static gint
pika_tool_line_get_hover (PikaToolLine *line,
const PikaCoords *coords,
GdkModifierType state)
{
PikaToolLinePrivate *private = line->private;
gint hover = PIKA_TOOL_LINE_HANDLE_NONE;
gdouble min_dist;
gint first_handle;
gint i;
/* find the closest handle to the cursor */
min_dist = G_MAXDOUBLE;
first_handle = private->sliders->len - 1;
/* skip the sliders if the two endpoints are the same, in particular so
* that if the line is created during a button-press event (as in the
* blend tool), the end endpoint is dragged, instead of a slider.
*/
if (private->x1 == private->x2 && private->y1 == private->y2)
first_handle = -1;
for (i = first_handle; i > PIKA_TOOL_LINE_HANDLE_NONE; i--)
{
PikaCanvasItem *handle;
if (PIKA_TOOL_LINE_HANDLE_IS_SLIDER (i))
{
const PikaControllerSlider *slider;
slider = pika_tool_line_get_slider (line, i);
if (! slider->visible || ! slider->selectable)
continue;
}
handle = pika_tool_line_get_handle (line, i);
if (pika_tool_line_handle_hit (handle,
private->mouse_x,
private->mouse_y,
&min_dist))
{
hover = i;
}
}
if (hover == PIKA_TOOL_LINE_HANDLE_NONE)
{
gboolean constrain;
gdouble value;
gdouble dist;
constrain = (state & pika_get_constrain_behavior_mask ()) != 0;
value = pika_tool_line_project_point (line,
private->mouse_x,
private->mouse_y,
constrain,
&dist);
if (value >= 0.0 && value <= 1.0 && dist <= LINE_VICINITY)
{
gboolean can_add;
g_signal_emit (line, line_signals[CAN_ADD_SLIDER], 0,
value, &can_add);
if (can_add)
{
hover = HOVER_NEW_SLIDER;
private->new_slider_value = value;
}
}
}
return hover;
}
static PikaControllerSlider *
pika_tool_line_get_slider (PikaToolLine *line,
gint slider)
{
PikaToolLinePrivate *private = line->private;
pika_assert (slider >= 0 && slider < private->sliders->len);
return &g_array_index (private->sliders, PikaControllerSlider, slider);
}
static PikaCanvasItem *
pika_tool_line_get_handle (PikaToolLine *line,
gint handle)
{
PikaToolLinePrivate *private = line->private;
switch (handle)
{
case PIKA_TOOL_LINE_HANDLE_NONE:
return NULL;
case PIKA_TOOL_LINE_HANDLE_START:
return private->start_handle;
case PIKA_TOOL_LINE_HANDLE_END:
return private->end_handle;
default:
pika_assert (handle >= 0 &&
handle < (gint) private->slider_handles->len);
return g_array_index (private->slider_handles,
PikaCanvasItem *, handle);
}
}
static gdouble
pika_tool_line_project_point (PikaToolLine *line,
gdouble x,
gdouble y,
gboolean constrain,
gdouble *dist)
{
PikaToolLinePrivate *private = line->private;
gdouble length_sqr;
gdouble value = 0.0;
length_sqr = SQR (private->x2 - private->x1) +
SQR (private->y2 - private->y1);
/* don't calculate the projection for 0-length lines, since we'll just get
* NaN.
*/
if (length_sqr > 0.0)
{
value = (private->x2 - private->x1) * (x - private->x1) +
(private->y2 - private->y1) * (y - private->y1);
value /= length_sqr;
if (dist)
{
gdouble px;
gdouble py;
px = private->x1 + (private->x2 - private->x1) * value;
py = private->y1 + (private->y2 - private->y1) * value;
*dist = pika_canvas_item_transform_distance (private->line,
x, y,
px, py);
}
if (constrain)
value = RINT (12.0 * value) / 12.0;
}
else
{
if (dist)
{
*dist = pika_canvas_item_transform_distance (private->line,
x, y,
private->x1, private->y1);
}
}
return value;
}
static gboolean
pika_tool_line_selection_motion (PikaToolLine *line,
gboolean constrain)
{
PikaToolLinePrivate *private = line->private;
gdouble x = private->mouse_x;
gdouble y = private->mouse_y;
if (private->grab != GRAB_SELECTION)
return FALSE;
switch (private->selection)
{
case PIKA_TOOL_LINE_HANDLE_NONE:
pika_assert_not_reached ();
case PIKA_TOOL_LINE_HANDLE_START:
if (constrain)
{
pika_display_shell_constrain_line (
pika_tool_widget_get_shell (PIKA_TOOL_WIDGET (line)),
private->x2, private->y2,
&x, &y,
PIKA_CONSTRAIN_LINE_15_DEGREES);
}
g_object_set (line,
"x1", x,
"y1", y,
NULL);
return TRUE;
case PIKA_TOOL_LINE_HANDLE_END:
if (constrain)
{
pika_display_shell_constrain_line (
pika_tool_widget_get_shell (PIKA_TOOL_WIDGET (line)),
private->x1, private->y1,
&x, &y,
PIKA_CONSTRAIN_LINE_15_DEGREES);
}
g_object_set (line,
"x2", x,
"y2", y,
NULL);
return TRUE;
default:
{
PikaDisplayShell *shell;
PikaControllerSlider *slider;
gdouble value;
gdouble dist;
gboolean remove_slider;
shell = pika_tool_widget_get_shell (PIKA_TOOL_WIDGET (line));
slider = pika_tool_line_get_slider (line, private->selection);
/* project the cursor position onto the line */
value = pika_tool_line_project_point (line, x, y, constrain, &dist);
/* slider dragging */
if (slider->movable)
{
value = CLAMP (value, slider->min, slider->max);
value = CLAMP (value, 0.0, 1.0);
value = fabs (value); /* avoid negative zero */
slider->value = value;
g_object_set (line,
"sliders", private->sliders,
NULL);
}
/* slider tearing */
remove_slider = slider->removable && dist > SLIDER_TEAR_DISTANCE;
if (remove_slider != private->remove_slider)
{
private->remove_slider = remove_slider;
g_signal_emit (line, line_signals[PREPARE_TO_REMOVE_SLIDER], 0,
private->selection, remove_slider);
/* set the cursor modifier to a minus by talking to the shell
* directly -- eek!
*/
{
PikaCursorType cursor;
PikaToolCursorType tool_cursor;
PikaCursorModifier modifier;
cursor = shell->current_cursor;
tool_cursor = shell->tool_cursor;
modifier = PIKA_CURSOR_MODIFIER_NONE;
pika_tool_line_get_cursor (PIKA_TOOL_WIDGET (line), NULL, 0,
&cursor, &tool_cursor, &modifier);
pika_display_shell_set_cursor (shell, cursor, tool_cursor, modifier);
}
pika_tool_line_update_handles (line);
pika_tool_line_update_circle (line);
pika_tool_line_update_status (line,
constrain ?
pika_get_constrain_behavior_mask () :
0,
TRUE);
}
return TRUE;
}
}
}
static void
pika_tool_line_update_handles (PikaToolLine *line)
{
PikaToolLinePrivate *private = line->private;
gdouble value;
gdouble dist;
gint i;
value = pika_tool_line_project_point (line,
private->mouse_x,
private->mouse_y,
FALSE,
&dist);
for (i = 0; i < private->sliders->len; i++)
{
const PikaControllerSlider *slider;
PikaCanvasItem *handle;
gint size;
gint hit_radius;
gboolean show_autohidden;
gboolean visible;
slider = pika_tool_line_get_slider (line, i);
handle = pika_tool_line_get_handle (line, i);
size = slider->size * SLIDER_HANDLE_SIZE;
size = MAX (size, 1);
hit_radius = (MAX (size, SLIDER_HANDLE_SIZE) * HANDLE_CIRCLE_SCALE) / 2;
/* show a autohidden slider if it's selected, or if no other handle is
* grabbed or hovered-over, and the cursor is close enough to the line,
* between the slider's min and max values.
*/
show_autohidden = private->selection == i ||
(private->grab == GRAB_NONE &&
(private->hover <= PIKA_TOOL_LINE_HANDLE_NONE ||
private->hover == i) &&
dist <= hit_radius &&
value >= slider->min &&
value <= slider->max);
visible = slider->visible &&
(! slider->autohide || show_autohidden) &&
! (private->selection == i && private->remove_slider);
handle = pika_tool_line_get_handle (line, i);
if (visible)
{
g_object_set (handle,
"type", slider->type,
"width", size,
"height", size,
NULL);
}
pika_canvas_item_set_visible (handle, visible);
}
}
static void
pika_tool_line_update_circle (PikaToolLine *line)
{
PikaToolLinePrivate *private = line->private;
gboolean visible;
visible = (private->grab == GRAB_NONE &&
private->hover != PIKA_TOOL_LINE_HANDLE_NONE) ||
(private->grab == GRAB_SELECTION &&
private->remove_slider);
if (visible)
{
gdouble x;
gdouble y;
gint width;
gint height;
gboolean dashed;
if (private->grab == GRAB_NONE && private->hover == HOVER_NEW_SLIDER)
{
/* new slider */
x = private->x1 +
(private->x2 - private->x1) * private->new_slider_value;
y = private->y1 +
(private->y2 - private->y1) * private->new_slider_value;
width = height = SLIDER_HANDLE_SIZE;
dashed = TRUE;
}
else
{
PikaCanvasItem *handle;
if (private->grab == GRAB_SELECTION)
{
/* tear slider */
handle = pika_tool_line_get_handle (line, private->selection);
dashed = TRUE;
}
else
{
/* hover over handle */
handle = pika_tool_line_get_handle (line, private->hover);
dashed = FALSE;
}
pika_canvas_handle_get_position (handle, &x, &y);
pika_canvas_handle_get_size (handle, &width, &height);
}
width = MAX (width, SLIDER_HANDLE_SIZE);
height = MAX (height, SLIDER_HANDLE_SIZE);
width *= HANDLE_CIRCLE_SCALE;
height *= HANDLE_CIRCLE_SCALE;
pika_canvas_handle_set_position (private->handle_circle, x, y);
pika_canvas_handle_set_size (private->handle_circle, width, height);
g_object_set (private->handle_circle,
"type", dashed ? PIKA_HANDLE_DASHED_CIRCLE :
PIKA_HANDLE_CIRCLE,
NULL);
}
pika_canvas_item_set_visible (private->handle_circle, visible);
}
static void
pika_tool_line_update_hilight (PikaToolLine *line)
{
PikaToolLinePrivate *private = line->private;
gboolean focus;
gint i;
focus = pika_tool_widget_get_focus (PIKA_TOOL_WIDGET (line));
for (i = PIKA_TOOL_LINE_HANDLE_NONE + 1;
i < (gint) private->sliders->len;
i++)
{
PikaCanvasItem *handle;
handle = pika_tool_line_get_handle (line, i);
pika_canvas_item_set_highlight (handle, focus && i == private->selection);
}
}
static void
pika_tool_line_update_status (PikaToolLine *line,
GdkModifierType state,
gboolean proximity)
{
PikaToolLinePrivate *private = line->private;
if (proximity)
{
PikaDisplayShell *shell;
const gchar *toggle_behavior_format = NULL;
const gchar *message = NULL;
gchar *line_status = NULL;
gchar *status;
gint handle;
shell = pika_tool_widget_get_shell (PIKA_TOOL_WIDGET (line));
if (private->grab == GRAB_SELECTION)
handle = private->selection;
else
handle = private->hover;
if (handle == PIKA_TOOL_LINE_HANDLE_START ||
handle == PIKA_TOOL_LINE_HANDLE_END)
{
line_status = pika_display_shell_get_line_status (shell,
_("Click-Drag to move the endpoint"),
". ",
private->x1,
private->y1,
private->x2,
private->y2);
toggle_behavior_format = _("%s for constrained angles");
}
else if (PIKA_TOOL_LINE_HANDLE_IS_SLIDER (handle) ||
handle == HOVER_NEW_SLIDER)
{
if (private->grab == GRAB_SELECTION && private->remove_slider)
{
message = _("Release to remove the slider");
}
else
{
toggle_behavior_format = _("%s for constrained values");
if (PIKA_TOOL_LINE_HANDLE_IS_SLIDER (handle))
{
if (pika_tool_line_get_slider (line, handle)->movable)
{
if (pika_tool_line_get_slider (line, handle)->removable)
{
if (private->grab == GRAB_SELECTION)
{
message = _("Click-Drag to move the slider; "
"drag away to remove the slider");
}
else
{
message = _("Click-Drag to move or remove the slider");
}
}
else
{
message = _("Click-Drag to move the slider");
}
}
else
{
toggle_behavior_format = NULL;
if (pika_tool_line_get_slider (line, handle)->removable)
{
if (private->grab == GRAB_SELECTION)
{
message = _("Click-Drag away to remove the slider");
}
else
{
message = _("Click-Drag to remove the slider");
}
}
else
{
message = NULL;
}
}
}
else
{
message = _("Click or Click-Drag to add a new slider");
}
}
}
else if (state & GDK_MOD1_MASK)
{
message = _("Click-Drag to move the line");
}
status =
pika_suggest_modifiers (message ? message : (line_status ? line_status : ""),
((toggle_behavior_format ?
pika_get_constrain_behavior_mask () : 0) |
(private->grab == GRAB_NONE ?
GDK_MOD1_MASK : 0)) &
~state,
NULL,
toggle_behavior_format,
_("%s to move the whole line"));
if (message || line_status)
{
pika_tool_widget_set_status (PIKA_TOOL_WIDGET (line), status);
}
else
{
line_status = pika_display_shell_get_line_status (shell,
private->status_title,
". ",
private->x1,
private->y1,
private->x2,
private->y2);
pika_tool_widget_set_status_coords (PIKA_TOOL_WIDGET (line),
line_status,
private->x2 - private->x1,
", ",
private->y2 - private->y1,
status);
}
g_free (status);
if (line_status)
g_free (line_status);
}
else
{
pika_tool_widget_set_status (PIKA_TOOL_WIDGET (line), NULL);
}
}
static gboolean
pika_tool_line_handle_hit (PikaCanvasItem *handle,
gdouble x,
gdouble y,
gdouble *min_dist)
{
gdouble handle_x;
gdouble handle_y;
gint handle_width;
gint handle_height;
gint radius;
gdouble dist;
pika_canvas_handle_get_position (handle, &handle_x, &handle_y);
pika_canvas_handle_get_size (handle, &handle_width, &handle_height);
handle_width = MAX (handle_width, SLIDER_HANDLE_SIZE);
handle_height = MAX (handle_height, SLIDER_HANDLE_SIZE);
radius = ((gint) (handle_width * HANDLE_CIRCLE_SCALE)) / 2;
radius = MAX (radius, LINE_VICINITY);
dist = pika_canvas_item_transform_distance (handle,
x, y, handle_x, handle_y);
if (dist <= radius && dist < *min_dist)
{
*min_dist = dist;
return TRUE;
}
else
{
return FALSE;
}
}
/* public functions */
PikaToolWidget *
pika_tool_line_new (PikaDisplayShell *shell,
gdouble x1,
gdouble y1,
gdouble x2,
gdouble y2)
{
g_return_val_if_fail (PIKA_IS_DISPLAY_SHELL (shell), NULL);
return g_object_new (PIKA_TYPE_TOOL_LINE,
"shell", shell,
"x1", x1,
"y1", y1,
"x2", x2,
"y2", y2,
NULL);
}
void
pika_tool_line_set_sliders (PikaToolLine *line,
const PikaControllerSlider *sliders,
gint n_sliders)
{
PikaToolLinePrivate *private;
g_return_if_fail (PIKA_IS_TOOL_LINE (line));
g_return_if_fail (n_sliders == 0 || (n_sliders > 0 && sliders != NULL));
private = line->private;
if (PIKA_TOOL_LINE_HANDLE_IS_SLIDER (private->selection) &&
private->sliders->len != n_sliders)
{
pika_tool_line_set_selection (line, PIKA_TOOL_LINE_HANDLE_NONE);
}
g_array_set_size (private->sliders, n_sliders);
memcpy (private->sliders->data, sliders,
n_sliders * sizeof (PikaControllerSlider));
g_object_set (line,
"sliders", private->sliders,
NULL);
}
const PikaControllerSlider *
pika_tool_line_get_sliders (PikaToolLine *line,
gint *n_sliders)
{
PikaToolLinePrivate *private;
g_return_val_if_fail (PIKA_IS_TOOL_LINE (line), NULL);
private = line->private;
if (n_sliders) *n_sliders = private->sliders->len;
return (const PikaControllerSlider *) private->sliders->data;
}
void
pika_tool_line_set_selection (PikaToolLine *line,
gint handle)
{
PikaToolLinePrivate *private;
g_return_if_fail (PIKA_IS_TOOL_LINE (line));
private = line->private;
g_return_if_fail (handle >= PIKA_TOOL_LINE_HANDLE_NONE &&
handle < (gint) private->sliders->len);
g_object_set (line,
"selection", handle,
NULL);
}
gint
pika_tool_line_get_selection (PikaToolLine *line)
{
PikaToolLinePrivate *private;
g_return_val_if_fail (PIKA_IS_TOOL_LINE (line), PIKA_TOOL_LINE_HANDLE_NONE);
private = line->private;
return private->selection;
}
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