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gimp/app/tools/gimppolygonselecttool.c

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/* GIMP - The GNU Image Manipulation Program
*
* A polygonal selection tool for GIMP
* Copyright (C) 2007 Martin Nordholts
*
* Based on gimpfreeselecttool.c which is
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 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, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "config.h"
#include <gtk/gtk.h>
#include <gdk/gdkkeysyms.h>
#include "libgimpmath/gimpmath.h"
#include "libgimpwidgets/gimpwidgets.h"
#include "tools-types.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 "display/gimpdisplay.h"
#include "gimppolygonselecttool.h"
#include "gimpselectionoptions.h"
#include "gimptoolcontrol.h"
#include "gimp-intl.h"
#define DEFAULT_MAX_INC 1024
#define HANDLE_SIZE 10
#define POINT_GRAB_THRESHOLD_SQ SQR(HANDLE_SIZE / 2)
struct _GimpPolygonSelectTool
{
GimpSelectionTool parent_instance;
/* Point which is part of he polygon already. */
GimpVector2 *grabbed_point;
/* Save the grabbed point state so we can cancel a movement
* operation.
*/
GimpVector2 saved_grabbed_point;
/* 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;
/* The number of points used for the actual selection. */
gint n_points;
gint max_segs;
};
static void gimp_polygon_select_tool_finalize (GObject *object);
static void gimp_polygon_select_tool_control (GimpTool *tool,
GimpToolAction action,
GimpDisplay *display);
static void gimp_polygon_select_tool_oper_update (GimpTool *tool,
GimpCoords *coords,
GdkModifierType state,
gboolean proximity,
GimpDisplay *display);
static void gimp_polygon_select_tool_cursor_update (GimpTool *tool,
GimpCoords *coords,
GdkModifierType state,
GimpDisplay *display);
static void gimp_polygon_select_tool_button_press (GimpTool *tool,
GimpCoords *coords,
guint32 time,
GdkModifierType state,
GimpDisplay *display);
static void gimp_polygon_select_tool_motion (GimpTool *tool,
GimpCoords *coords,
guint32 time,
GdkModifierType state,
GimpDisplay *display);
static void gimp_polygon_select_tool_button_release (GimpTool *tool,
GimpCoords *coords,
guint32 time,
GdkModifierType state,
GimpButtonReleaseType release_type,
GimpDisplay *display);
static gboolean gimp_polygon_select_tool_key_press (GimpTool *tool,
GdkEventKey *kevent,
GimpDisplay *display);
static void gimp_polygon_select_tool_start (GimpPolygonSelectTool *poly_sel_tool,
GimpDisplay *display);
static void gimp_polygon_select_tool_commit (GimpPolygonSelectTool *poly_sel_tool,
GimpDisplay *display);
static void gimp_polygon_select_tool_halt (GimpPolygonSelectTool *poly_sel_tool);
static void gimp_polygon_select_tool_draw (GimpDrawTool *draw_tool);
static void gimp_polygon_select_tool_real_select (GimpPolygonSelectTool *poly_sel_tool,
GimpDisplay *display);
static GimpVector2 *gimp_polygon_select_tool_add_point (GimpPolygonSelectTool *poly_sel_tool,
gdouble x,
gdouble y);
static void gimp_polygon_select_tool_remove_last (GimpPolygonSelectTool *poly_sel_tool);
static void gimp_polygon_select_tool_select_closest_point
(GimpPolygonSelectTool *poly_sel_tool,
GimpDisplay *display,
GimpCoords *coords);
static gboolean gimp_polygon_select_tool_should_close (GimpPolygonSelectTool *poly_sel_tool,
GimpDisplay *display,
GimpCoords *coords);
G_DEFINE_TYPE (GimpPolygonSelectTool, gimp_polygon_select_tool,
GIMP_TYPE_SELECTION_TOOL);
#define parent_class gimp_polygon_select_tool_parent_class
void
gimp_polygon_select_tool_register (GimpToolRegisterCallback callback,
gpointer data)
{
(* callback) (GIMP_TYPE_POLYGON_SELECT_TOOL,
GIMP_TYPE_SELECTION_OPTIONS,
gimp_selection_options_gui,
0,
"gimp-polygon-select-tool",
_("Polygon Select"),
_("Polygon Select Tool: Select a hand-drawn polygon"),
N_("_Polygon Select"), "G",
NULL, GIMP_HELP_TOOL_POLYGON_SELECT,
GIMP_STOCK_TOOL_POLYGON_SELECT,
data);
}
static void
gimp_polygon_select_tool_class_init (GimpPolygonSelectToolClass *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_polygon_select_tool_finalize;
tool_class->control = gimp_polygon_select_tool_control;
tool_class->oper_update = gimp_polygon_select_tool_oper_update;
tool_class->cursor_update = gimp_polygon_select_tool_cursor_update;
tool_class->button_press = gimp_polygon_select_tool_button_press;
tool_class->motion = gimp_polygon_select_tool_motion;
tool_class->button_release = gimp_polygon_select_tool_button_release;
tool_class->key_press = gimp_polygon_select_tool_key_press;
draw_tool_class->draw = gimp_polygon_select_tool_draw;
klass->select = gimp_polygon_select_tool_real_select;
}
static void
gimp_polygon_select_tool_init (GimpPolygonSelectTool *poly_sel_tool)
{
GimpTool *tool = GIMP_TOOL (poly_sel_tool);
gimp_tool_control_set_scroll_lock (tool->control, FALSE);
gimp_tool_control_set_wants_click (tool->control, TRUE);
gimp_tool_control_set_tool_cursor (tool->control,
GIMP_TOOL_CURSOR_POLYGON_SELECT);
poly_sel_tool->points = NULL;
poly_sel_tool->n_points = 0;
poly_sel_tool->max_segs = 0;
}
static void
gimp_polygon_select_tool_finalize (GObject *object)
{
GimpPolygonSelectTool *poly_sel_tool = GIMP_POLYGON_SELECT_TOOL (object);
if (poly_sel_tool->points)
{
g_free (poly_sel_tool->points);
poly_sel_tool->points = NULL;
}
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
gimp_polygon_select_tool_control (GimpTool *tool,
GimpToolAction action,
GimpDisplay *display)
{
switch (action)
{
case GIMP_TOOL_ACTION_PAUSE:
case GIMP_TOOL_ACTION_RESUME:
break;
case GIMP_TOOL_ACTION_HALT:
gimp_polygon_select_tool_halt (GIMP_POLYGON_SELECT_TOOL (tool));
break;
}
GIMP_TOOL_CLASS (parent_class)->control (tool, action, display);
}
static void
gimp_polygon_select_tool_oper_update (GimpTool *tool,
GimpCoords *coords,
GdkModifierType state,
gboolean proximity,
GimpDisplay *display)
{
GimpPolygonSelectTool *poly_sel_tool = GIMP_POLYGON_SELECT_TOOL (tool);
if (tool->display == display)
{
gboolean hovering_first_point;
gimp_polygon_select_tool_select_closest_point (poly_sel_tool,
display,
coords);
hovering_first_point = gimp_polygon_select_tool_should_close (poly_sel_tool,
display,
coords);
gimp_draw_tool_pause (GIMP_DRAW_TOOL (tool));
if (poly_sel_tool->n_points == 0 ||
(poly_sel_tool->grabbed_point && ! hovering_first_point))
{
poly_sel_tool->show_pending_point = FALSE;
}
else
{
poly_sel_tool->show_pending_point = TRUE;
if (hovering_first_point)
{
poly_sel_tool->pending_point = poly_sel_tool->points[0];
}
else
{
poly_sel_tool->pending_point.x = coords->x;
poly_sel_tool->pending_point.y = coords->y;
}
}
gimp_draw_tool_resume (GIMP_DRAW_TOOL (tool));
}
}
static void
gimp_polygon_select_tool_cursor_update (GimpTool *tool,
GimpCoords *coords,
GdkModifierType state,
GimpDisplay *display)
{
GimpPolygonSelectTool *poly_sel_tool = GIMP_POLYGON_SELECT_TOOL (tool);
if (poly_sel_tool->grabbed_point &&
! gimp_polygon_select_tool_should_close (poly_sel_tool, display, coords))
{
gimp_tool_set_cursor (tool, display,
gimp_tool_control_get_cursor (tool->control),
gimp_tool_control_get_tool_cursor (tool->control),
GIMP_CURSOR_MODIFIER_MOVE);
return;
}
GIMP_TOOL_CLASS (parent_class)->cursor_update (tool, coords, state, display);
}
static void
gimp_polygon_select_tool_button_press (GimpTool *tool,
GimpCoords *coords,
guint32 time,
GdkModifierType state,
GimpDisplay *display)
{
GimpPolygonSelectTool *poly_sel_tool = GIMP_POLYGON_SELECT_TOOL (tool);
if (display != tool->display)
{
gimp_polygon_select_tool_start (poly_sel_tool, display);
gimp_selection_tool_start_edit (GIMP_SELECTION_TOOL (poly_sel_tool),
coords);
}
if (poly_sel_tool->grabbed_point)
{
poly_sel_tool->saved_grabbed_point = *poly_sel_tool->grabbed_point;
}
}
static void
gimp_polygon_select_tool_motion (GimpTool *tool,
GimpCoords *coords,
guint32 time,
GdkModifierType state,
GimpDisplay *display)
{
if (tool->display == display)
{
GimpPolygonSelectTool *poly_sel_tool = GIMP_POLYGON_SELECT_TOOL (tool);
GimpDrawTool *draw_tool = GIMP_DRAW_TOOL (tool);
gimp_draw_tool_pause (draw_tool);
if (poly_sel_tool->grabbed_point)
{
poly_sel_tool->grabbed_point->x = coords->x;
poly_sel_tool->grabbed_point->y = coords->y;
if (gimp_polygon_select_tool_should_close (poly_sel_tool,
display,
coords))
{
poly_sel_tool->pending_point.x = coords->x;
poly_sel_tool->pending_point.y = coords->y;
}
}
else
{
poly_sel_tool->pending_point.x = coords->x;
poly_sel_tool->pending_point.y = coords->y;
}
gimp_draw_tool_resume (draw_tool);
}
}
static void
gimp_polygon_select_tool_button_release (GimpTool *tool,
GimpCoords *coords,
guint32 time,
GdkModifierType state,
GimpButtonReleaseType release_type,
GimpDisplay *display)
{
GimpPolygonSelectTool *poly_sel_tool = GIMP_POLYGON_SELECT_TOOL (tool);
gimp_draw_tool_pause (GIMP_DRAW_TOOL (poly_sel_tool));
switch (release_type)
{
case GIMP_BUTTON_RELEASE_CLICK:
if (gimp_polygon_select_tool_should_close (poly_sel_tool,
display,
coords))
{
gimp_polygon_select_tool_commit (poly_sel_tool, display);
break;
}
/* Fall through */
case GIMP_BUTTON_RELEASE_NORMAL:
if (! poly_sel_tool->grabbed_point)
{
gimp_polygon_select_tool_add_point (poly_sel_tool,
coords->x, coords->y);
}
else
{
/* We don't need to do anything since the grabbed point have
* already been moved in _motion.
*/
}
break;
case GIMP_BUTTON_RELEASE_CANCEL:
if (poly_sel_tool->grabbed_point)
{
*poly_sel_tool->grabbed_point = poly_sel_tool->saved_grabbed_point;
}
break;
case GIMP_BUTTON_RELEASE_NO_MOTION:
if (gimp_image_floating_sel (display->image))
{
/* If there is a floating selection, anchor it */
floating_sel_anchor (gimp_image_floating_sel (display->image));
}
else
{
/* Otherwise, clear the selection mask */
gimp_channel_clear (gimp_image_get_mask (display->image), NULL, TRUE);
}
break;
}
gimp_draw_tool_resume (GIMP_DRAW_TOOL (poly_sel_tool));
}
static gboolean
gimp_polygon_select_tool_key_press (GimpTool *tool,
GdkEventKey *kevent,
GimpDisplay *display)
{
GimpPolygonSelectTool *poly_sel_tool = GIMP_POLYGON_SELECT_TOOL (tool);
switch (kevent->keyval)
{
case GDK_BackSpace:
gimp_polygon_select_tool_remove_last (poly_sel_tool);
return TRUE;
case GDK_Return:
case GDK_KP_Enter:
case GDK_ISO_Enter:
gimp_polygon_select_tool_commit (poly_sel_tool, display);
return TRUE;
case GDK_Escape:
gimp_polygon_select_tool_halt (poly_sel_tool);
return TRUE;
default:
break;
}
return FALSE;
}
static void
gimp_polygon_select_tool_start (GimpPolygonSelectTool *poly_sel_tool,
GimpDisplay *display)
{
GimpTool *tool = GIMP_TOOL (poly_sel_tool);
GimpDrawTool *draw_tool = GIMP_DRAW_TOOL (tool);
gimp_polygon_select_tool_halt (poly_sel_tool);
gimp_tool_control_activate (tool->control);
tool->display = display;
poly_sel_tool->n_points = 0;
poly_sel_tool->grabbed_point = NULL;
poly_sel_tool->show_pending_point = FALSE;
gimp_draw_tool_start (draw_tool, display);
}
static void
gimp_polygon_select_tool_commit (GimpPolygonSelectTool *poly_sel_tool,
GimpDisplay *display)
{
if (poly_sel_tool->n_points >= 3)
{
gimp_polygon_select_tool_select (poly_sel_tool, display);
}
gimp_polygon_select_tool_halt (poly_sel_tool);
gimp_image_flush (display->image);
}
static void
gimp_polygon_select_tool_halt (GimpPolygonSelectTool *poly_sel_tool)
{
GimpTool *tool = GIMP_TOOL (poly_sel_tool);
GimpDrawTool *draw_tool = GIMP_DRAW_TOOL (poly_sel_tool);
if (gimp_draw_tool_is_active (draw_tool))
gimp_draw_tool_stop (draw_tool);
if (gimp_tool_control_is_active (tool->control))
gimp_tool_control_halt (tool->control);
poly_sel_tool->grabbed_point = NULL;
poly_sel_tool->show_pending_point = FALSE;
poly_sel_tool->n_points = 0;
tool->display = NULL;
}
static void
gimp_polygon_select_tool_draw (GimpDrawTool *draw_tool)
{
GimpPolygonSelectTool *poly_sel_tool = GIMP_POLYGON_SELECT_TOOL (draw_tool);
gimp_draw_tool_draw_lines (draw_tool,
poly_sel_tool->points, poly_sel_tool->n_points,
FALSE, FALSE);
if (poly_sel_tool->grabbed_point)
{
gimp_draw_tool_draw_handle (draw_tool, GIMP_HANDLE_CIRCLE,
poly_sel_tool->grabbed_point->x,
poly_sel_tool->grabbed_point->y,
HANDLE_SIZE, HANDLE_SIZE,
GTK_ANCHOR_CENTER, FALSE);
}
if (poly_sel_tool->show_pending_point)
{
GimpVector2 last = poly_sel_tool->points[poly_sel_tool->n_points - 1];
gimp_draw_tool_draw_line (draw_tool,
last.x,
last.y,
poly_sel_tool->pending_point.x,
poly_sel_tool->pending_point.y,
FALSE);
}
}
void
gimp_polygon_select_tool_select (GimpPolygonSelectTool *poly_sel_tool,
GimpDisplay *display)
{
g_return_if_fail (GIMP_IS_POLYGON_SELECT_TOOL (poly_sel_tool));
g_return_if_fail (GIMP_IS_DISPLAY (display));
GIMP_POLYGON_SELECT_TOOL_GET_CLASS (poly_sel_tool)->select (poly_sel_tool,
display);
}
static void
gimp_polygon_select_tool_real_select (GimpPolygonSelectTool *poly_sel_tool,
GimpDisplay *display)
{
GimpSelectionOptions *options = GIMP_SELECTION_TOOL_GET_OPTIONS (poly_sel_tool);
gimp_channel_select_polygon (gimp_image_get_mask (display->image),
Q_("command|Polygon Select"),
poly_sel_tool->n_points,
poly_sel_tool->points,
options->operation,
options->antialias,
options->feather,
options->feather_radius,
options->feather_radius,
TRUE);
}
static GimpVector2 *
gimp_polygon_select_tool_add_point (GimpPolygonSelectTool *poly_sel_tool,
gdouble x,
gdouble y)
{
if (poly_sel_tool->n_points >= poly_sel_tool->max_segs)
{
poly_sel_tool->max_segs += DEFAULT_MAX_INC;
poly_sel_tool->points = g_realloc (poly_sel_tool->points,
sizeof (GimpVector2) * poly_sel_tool->max_segs);
}
poly_sel_tool->points[poly_sel_tool->n_points].x = x;
poly_sel_tool->points[poly_sel_tool->n_points].y = y;
return &poly_sel_tool->points[poly_sel_tool->n_points++];
}
static void
gimp_polygon_select_tool_remove_last (GimpPolygonSelectTool *poly_sel_tool)
{
GimpDrawTool *draw_tool = GIMP_DRAW_TOOL (poly_sel_tool);
gimp_draw_tool_pause (draw_tool);
poly_sel_tool->n_points--;
if (poly_sel_tool->n_points == 0)
{
gimp_polygon_select_tool_halt (poly_sel_tool);
}
gimp_draw_tool_resume (draw_tool);
}
static void
gimp_polygon_select_tool_select_closest_point (GimpPolygonSelectTool *poly_sel_tool,
GimpDisplay *display,
GimpCoords *coords)
{
GimpDrawTool *draw_tool = GIMP_DRAW_TOOL (poly_sel_tool);
gdouble shortest_dist = POINT_GRAB_THRESHOLD_SQ;
GimpVector2 *grabbed_point = NULL;
int i;
for (i = 0; i < poly_sel_tool->n_points; i++)
{
gdouble dist;
dist = gimp_draw_tool_calc_distance_square (draw_tool,
display,
coords->x,
coords->y,
poly_sel_tool->points[i].x,
poly_sel_tool->points[i].y);
if (dist < shortest_dist)
{
grabbed_point = &poly_sel_tool->points[i];
}
}
if (grabbed_point != poly_sel_tool->grabbed_point)
{
gimp_draw_tool_pause(draw_tool);
poly_sel_tool->grabbed_point = grabbed_point;
gimp_draw_tool_resume(draw_tool);
}
}
static gboolean
gimp_polygon_select_tool_should_close (GimpPolygonSelectTool *poly_sel_tool,
GimpDisplay *display,
GimpCoords *coords)
{
gboolean should_close = FALSE;
if (poly_sel_tool->n_points > 0)
{
gdouble dist;
dist = gimp_draw_tool_calc_distance_square (GIMP_DRAW_TOOL (poly_sel_tool),
display,
coords->x,
coords->y,
poly_sel_tool->points[0].x,
poly_sel_tool->points[0].y);
should_close = dist < POINT_GRAB_THRESHOLD_SQ;
}
return should_close;
}
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