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PIKApp/app/vectors/pikastroke.c

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Initial checkin of Pika from heckimp
2023-09-26 00:35:21 +02:00
/* 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
*
* pikastroke.c
* Copyright (C) 2002 Simon Budig <simon@gimp.org>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <cairo.h>
#include <gegl.h>
#include <gdk-pixbuf/gdk-pixbuf.h>
#include "libpikabase/pikabase.h"
#include "libpikamath/pikamath.h"
#include "vectors-types.h"
#include "core/pika-memsize.h"
#include "core/pikacoords.h"
#include "core/pikaparamspecs.h"
#include "core/pika-transform-utils.h"
#include "pikaanchor.h"
#include "pikastroke.h"
enum
{
PROP_0,
PROP_CONTROL_POINTS,
PROP_CLOSED
};
/* Prototypes */
static void pika_stroke_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec);
static void pika_stroke_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec);
static void pika_stroke_finalize (GObject *object);
static gint64 pika_stroke_get_memsize (PikaObject *object,
gint64 *gui_size);
static PikaAnchor * pika_stroke_real_anchor_get (PikaStroke *stroke,
const PikaCoords *coord);
static PikaAnchor * pika_stroke_real_anchor_get_next (PikaStroke *stroke,
const PikaAnchor *prev);
static void pika_stroke_real_anchor_select (PikaStroke *stroke,
PikaAnchor *anchor,
gboolean selected,
gboolean exclusive);
static void pika_stroke_real_anchor_move_relative (PikaStroke *stroke,
PikaAnchor *anchor,
const PikaCoords *delta,
PikaAnchorFeatureType feature);
static void pika_stroke_real_anchor_move_absolute (PikaStroke *stroke,
PikaAnchor *anchor,
const PikaCoords *delta,
PikaAnchorFeatureType feature);
static void pika_stroke_real_anchor_convert (PikaStroke *stroke,
PikaAnchor *anchor,
PikaAnchorFeatureType feature);
static void pika_stroke_real_anchor_delete (PikaStroke *stroke,
PikaAnchor *anchor);
static gboolean pika_stroke_real_point_is_movable
(PikaStroke *stroke,
PikaAnchor *predec,
gdouble position);
static void pika_stroke_real_point_move_relative
(PikaStroke *stroke,
PikaAnchor *predec,
gdouble position,
const PikaCoords *deltacoord,
PikaAnchorFeatureType feature);
static void pika_stroke_real_point_move_absolute
(PikaStroke *stroke,
PikaAnchor *predec,
gdouble position,
const PikaCoords *coord,
PikaAnchorFeatureType feature);
static void pika_stroke_real_close (PikaStroke *stroke);
static PikaStroke * pika_stroke_real_open (PikaStroke *stroke,
PikaAnchor *end_anchor);
static gboolean pika_stroke_real_anchor_is_insertable
(PikaStroke *stroke,
PikaAnchor *predec,
gdouble position);
static PikaAnchor * pika_stroke_real_anchor_insert (PikaStroke *stroke,
PikaAnchor *predec,
gdouble position);
static gboolean pika_stroke_real_is_extendable (PikaStroke *stroke,
PikaAnchor *neighbor);
static PikaAnchor * pika_stroke_real_extend (PikaStroke *stroke,
const PikaCoords *coords,
PikaAnchor *neighbor,
PikaVectorExtendMode extend_mode);
gboolean pika_stroke_real_connect_stroke (PikaStroke *stroke,
PikaAnchor *anchor,
PikaStroke *extension,
PikaAnchor *neighbor);
static gboolean pika_stroke_real_is_empty (PikaStroke *stroke);
static gboolean pika_stroke_real_reverse (PikaStroke *stroke);
static gboolean pika_stroke_real_shift_start (PikaStroke *stroke,
PikaAnchor *anchor);
static gdouble pika_stroke_real_get_length (PikaStroke *stroke,
gdouble precision);
static gdouble pika_stroke_real_get_distance (PikaStroke *stroke,
const PikaCoords *coord);
static GArray * pika_stroke_real_interpolate (PikaStroke *stroke,
gdouble precision,
gboolean *closed);
static PikaStroke * pika_stroke_real_duplicate (PikaStroke *stroke);
static PikaBezierDesc * pika_stroke_real_make_bezier (PikaStroke *stroke);
static void pika_stroke_real_translate (PikaStroke *stroke,
gdouble offset_x,
gdouble offset_y);
static void pika_stroke_real_scale (PikaStroke *stroke,
gdouble scale_x,
gdouble scale_y);
static void pika_stroke_real_rotate (PikaStroke *stroke,
gdouble center_x,
gdouble center_y,
gdouble angle);
static void pika_stroke_real_flip (PikaStroke *stroke,
PikaOrientationType flip_type,
gdouble axis);
static void pika_stroke_real_flip_free (PikaStroke *stroke,
gdouble x1,
gdouble y1,
gdouble x2,
gdouble y2);
static void pika_stroke_real_transform (PikaStroke *stroke,
const PikaMatrix3 *matrix,
GQueue *ret_strokes);
static GList * pika_stroke_real_get_draw_anchors (PikaStroke *stroke);
static GList * pika_stroke_real_get_draw_controls (PikaStroke *stroke);
static GArray * pika_stroke_real_get_draw_lines (PikaStroke *stroke);
static GArray * pika_stroke_real_control_points_get (PikaStroke *stroke,
gboolean *ret_closed);
static gboolean pika_stroke_real_get_point_at_dist (PikaStroke *stroke,
gdouble dist,
gdouble precision,
PikaCoords *position,
gdouble *slope);
G_DEFINE_TYPE (PikaStroke, pika_stroke, PIKA_TYPE_OBJECT)
#define parent_class pika_stroke_parent_class
static void
pika_stroke_class_init (PikaStrokeClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
PikaObjectClass *pika_object_class = PIKA_OBJECT_CLASS (klass);
GParamSpec *param_spec;
object_class->finalize = pika_stroke_finalize;
object_class->get_property = pika_stroke_get_property;
object_class->set_property = pika_stroke_set_property;
pika_object_class->get_memsize = pika_stroke_get_memsize;
klass->changed = NULL;
klass->removed = NULL;
klass->anchor_get = pika_stroke_real_anchor_get;
klass->anchor_get_next = pika_stroke_real_anchor_get_next;
klass->anchor_select = pika_stroke_real_anchor_select;
klass->anchor_move_relative = pika_stroke_real_anchor_move_relative;
klass->anchor_move_absolute = pika_stroke_real_anchor_move_absolute;
klass->anchor_convert = pika_stroke_real_anchor_convert;
klass->anchor_delete = pika_stroke_real_anchor_delete;
klass->point_is_movable = pika_stroke_real_point_is_movable;
klass->point_move_relative = pika_stroke_real_point_move_relative;
klass->point_move_absolute = pika_stroke_real_point_move_absolute;
klass->nearest_point_get = NULL;
klass->nearest_tangent_get = NULL;
klass->nearest_intersection_get = NULL;
klass->close = pika_stroke_real_close;
klass->open = pika_stroke_real_open;
klass->anchor_is_insertable = pika_stroke_real_anchor_is_insertable;
klass->anchor_insert = pika_stroke_real_anchor_insert;
klass->is_extendable = pika_stroke_real_is_extendable;
klass->extend = pika_stroke_real_extend;
klass->connect_stroke = pika_stroke_real_connect_stroke;
klass->is_empty = pika_stroke_real_is_empty;
klass->reverse = pika_stroke_real_reverse;
klass->shift_start = pika_stroke_real_shift_start;
klass->get_length = pika_stroke_real_get_length;
klass->get_distance = pika_stroke_real_get_distance;
klass->get_point_at_dist = pika_stroke_real_get_point_at_dist;
klass->interpolate = pika_stroke_real_interpolate;
klass->duplicate = pika_stroke_real_duplicate;
klass->make_bezier = pika_stroke_real_make_bezier;
klass->translate = pika_stroke_real_translate;
klass->scale = pika_stroke_real_scale;
klass->rotate = pika_stroke_real_rotate;
klass->flip = pika_stroke_real_flip;
klass->flip_free = pika_stroke_real_flip_free;
klass->transform = pika_stroke_real_transform;
klass->get_draw_anchors = pika_stroke_real_get_draw_anchors;
klass->get_draw_controls = pika_stroke_real_get_draw_controls;
klass->get_draw_lines = pika_stroke_real_get_draw_lines;
klass->control_points_get = pika_stroke_real_control_points_get;
param_spec = g_param_spec_boxed ("pika-anchor",
"Pika Anchor",
"The control points of a Stroke",
PIKA_TYPE_ANCHOR,
PIKA_PARAM_WRITABLE |
G_PARAM_CONSTRUCT_ONLY);
g_object_class_install_property (object_class, PROP_CONTROL_POINTS,
pika_param_spec_value_array ("control-points",
"Control Points",
"This is an ValueArray "
"with the initial "
"control points of "
"the new Stroke",
param_spec,
PIKA_PARAM_WRITABLE |
G_PARAM_CONSTRUCT_ONLY));
g_object_class_install_property (object_class, PROP_CLOSED,
g_param_spec_boolean ("closed",
"Close Flag",
"this flag indicates "
"whether the stroke "
"is closed or not",
FALSE,
PIKA_PARAM_READWRITE |
G_PARAM_CONSTRUCT_ONLY));
}
static void
pika_stroke_init (PikaStroke *stroke)
{
stroke->anchors = g_queue_new ();
}
static void
pika_stroke_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec)
{
PikaStroke *stroke = PIKA_STROKE (object);
PikaValueArray *val_array;
gint length;
gint i;
switch (property_id)
{
case PROP_CLOSED:
stroke->closed = g_value_get_boolean (value);
break;
case PROP_CONTROL_POINTS:
g_return_if_fail (g_queue_is_empty (stroke->anchors));
g_return_if_fail (value != NULL);
val_array = g_value_get_boxed (value);
if (val_array == NULL)
return;
length = pika_value_array_length (val_array);
for (i = 0; i < length; i++)
{
GValue *item = pika_value_array_index (val_array, i);
g_return_if_fail (G_VALUE_HOLDS (item, PIKA_TYPE_ANCHOR));
g_queue_push_tail (stroke->anchors, g_value_dup_boxed (item));
}
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
pika_stroke_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec)
{
PikaStroke *stroke = PIKA_STROKE (object);
switch (property_id)
{
case PROP_CLOSED:
g_value_set_boolean (value, stroke->closed);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
pika_stroke_finalize (GObject *object)
{
PikaStroke *stroke = PIKA_STROKE (object);
g_queue_free_full (stroke->anchors, (GDestroyNotify) pika_anchor_free);
stroke->anchors = NULL;
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static gint64
pika_stroke_get_memsize (PikaObject *object,
gint64 *gui_size)
{
PikaStroke *stroke = PIKA_STROKE (object);
gint64 memsize = 0;
memsize += pika_g_queue_get_memsize (stroke->anchors, sizeof (PikaAnchor));
return memsize + PIKA_OBJECT_CLASS (parent_class)->get_memsize (object,
gui_size);
}
void
pika_stroke_set_id (PikaStroke *stroke,
gint id)
{
g_return_if_fail (PIKA_IS_STROKE (stroke));
g_return_if_fail (stroke->id == 0 /* we don't want changing IDs... */);
stroke->id = id;
}
gint
pika_stroke_get_id (PikaStroke *stroke)
{
g_return_val_if_fail (PIKA_IS_STROKE (stroke), -1);
return stroke->id;
}
PikaAnchor *
pika_stroke_anchor_get (PikaStroke *stroke,
const PikaCoords *coord)
{
g_return_val_if_fail (PIKA_IS_STROKE (stroke), NULL);
return PIKA_STROKE_GET_CLASS (stroke)->anchor_get (stroke, coord);
}
gdouble
pika_stroke_nearest_point_get (PikaStroke *stroke,
const PikaCoords *coord,
const gdouble precision,
PikaCoords *ret_point,
PikaAnchor **ret_segment_start,
PikaAnchor **ret_segment_end,
gdouble *ret_pos)
{
g_return_val_if_fail (PIKA_IS_STROKE (stroke), FALSE);
g_return_val_if_fail (coord != NULL, FALSE);
if (PIKA_STROKE_GET_CLASS (stroke)->nearest_point_get)
return PIKA_STROKE_GET_CLASS (stroke)->nearest_point_get (stroke,
coord,
precision,
ret_point,
ret_segment_start,
ret_segment_end,
ret_pos);
return -1;
}
gdouble
pika_stroke_nearest_tangent_get (PikaStroke *stroke,
const PikaCoords *coords1,
const PikaCoords *coords2,
gdouble precision,
PikaCoords *nearest,
PikaAnchor **ret_segment_start,
PikaAnchor **ret_segment_end,
gdouble *ret_pos)
{
g_return_val_if_fail (PIKA_IS_STROKE (stroke), FALSE);
g_return_val_if_fail (coords1 != NULL, FALSE);
g_return_val_if_fail (coords2 != NULL, FALSE);
if (PIKA_STROKE_GET_CLASS (stroke)->nearest_tangent_get)
return PIKA_STROKE_GET_CLASS (stroke)->nearest_tangent_get (stroke,
coords1,
coords2,
precision,
nearest,
ret_segment_start,
ret_segment_end,
ret_pos);
return -1;
}
gdouble
pika_stroke_nearest_intersection_get (PikaStroke *stroke,
const PikaCoords *coords1,
const PikaCoords *direction,
gdouble precision,
PikaCoords *nearest,
PikaAnchor **ret_segment_start,
PikaAnchor **ret_segment_end,
gdouble *ret_pos)
{
g_return_val_if_fail (PIKA_IS_STROKE (stroke), FALSE);
g_return_val_if_fail (coords1 != NULL, FALSE);
g_return_val_if_fail (direction != NULL, FALSE);
if (PIKA_STROKE_GET_CLASS (stroke)->nearest_intersection_get)
return PIKA_STROKE_GET_CLASS (stroke)->nearest_intersection_get (stroke,
coords1,
direction,
precision,
nearest,
ret_segment_start,
ret_segment_end,
ret_pos);
return -1;
}
static PikaAnchor *
pika_stroke_real_anchor_get (PikaStroke *stroke,
const PikaCoords *coord)
{
gdouble dx, dy;
gdouble mindist = -1;
GList *anchors;
GList *list;
PikaAnchor *anchor = NULL;
anchors = pika_stroke_get_draw_controls (stroke);
for (list = anchors; list; list = g_list_next (list))
{
dx = coord->x - PIKA_ANCHOR (list->data)->position.x;
dy = coord->y - PIKA_ANCHOR (list->data)->position.y;
if (mindist < 0 || mindist > dx * dx + dy * dy)
{
mindist = dx * dx + dy * dy;
anchor = PIKA_ANCHOR (list->data);
}
}
g_list_free (anchors);
anchors = pika_stroke_get_draw_anchors (stroke);
for (list = anchors; list; list = g_list_next (list))
{
dx = coord->x - PIKA_ANCHOR (list->data)->position.x;
dy = coord->y - PIKA_ANCHOR (list->data)->position.y;
if (mindist < 0 || mindist > dx * dx + dy * dy)
{
mindist = dx * dx + dy * dy;
anchor = PIKA_ANCHOR (list->data);
}
}
g_list_free (anchors);
return anchor;
}
PikaAnchor *
pika_stroke_anchor_get_next (PikaStroke *stroke,
const PikaAnchor *prev)
{
g_return_val_if_fail (PIKA_IS_STROKE (stroke), NULL);
return PIKA_STROKE_GET_CLASS (stroke)->anchor_get_next (stroke, prev);
}
static PikaAnchor *
pika_stroke_real_anchor_get_next (PikaStroke *stroke,
const PikaAnchor *prev)
{
GList *list;
if (prev)
{
list = g_queue_find (stroke->anchors, prev);
if (list)
list = g_list_next (list);
}
else
{
list = stroke->anchors->head;
}
if (list)
return PIKA_ANCHOR (list->data);
return NULL;
}
void
pika_stroke_anchor_select (PikaStroke *stroke,
PikaAnchor *anchor,
gboolean selected,
gboolean exclusive)
{
g_return_if_fail (PIKA_IS_STROKE (stroke));
PIKA_STROKE_GET_CLASS (stroke)->anchor_select (stroke, anchor,
selected, exclusive);
}
static void
pika_stroke_real_anchor_select (PikaStroke *stroke,
PikaAnchor *anchor,
gboolean selected,
gboolean exclusive)
{
GList *list = stroke->anchors->head;
if (exclusive)
{
while (list)
{
PIKA_ANCHOR (list->data)->selected = FALSE;
list = g_list_next (list);
}
}
list = g_queue_find (stroke->anchors, anchor);
if (list)
PIKA_ANCHOR (list->data)->selected = selected;
}
void
pika_stroke_anchor_move_relative (PikaStroke *stroke,
PikaAnchor *anchor,
const PikaCoords *delta,
PikaAnchorFeatureType feature)
{
g_return_if_fail (PIKA_IS_STROKE (stroke));
g_return_if_fail (anchor != NULL);
g_return_if_fail (g_queue_find (stroke->anchors, anchor));
PIKA_STROKE_GET_CLASS (stroke)->anchor_move_relative (stroke, anchor,
delta, feature);
}
static void
pika_stroke_real_anchor_move_relative (PikaStroke *stroke,
PikaAnchor *anchor,
const PikaCoords *delta,
PikaAnchorFeatureType feature)
{
anchor->position.x += delta->x;
anchor->position.y += delta->y;
}
void
pika_stroke_anchor_move_absolute (PikaStroke *stroke,
PikaAnchor *anchor,
const PikaCoords *coord,
PikaAnchorFeatureType feature)
{
g_return_if_fail (PIKA_IS_STROKE (stroke));
g_return_if_fail (anchor != NULL);
g_return_if_fail (g_queue_find (stroke->anchors, anchor));
PIKA_STROKE_GET_CLASS (stroke)->anchor_move_absolute (stroke, anchor,
coord, feature);
}
static void
pika_stroke_real_anchor_move_absolute (PikaStroke *stroke,
PikaAnchor *anchor,
const PikaCoords *coord,
PikaAnchorFeatureType feature)
{
anchor->position.x = coord->x;
anchor->position.y = coord->y;
}
gboolean
pika_stroke_point_is_movable (PikaStroke *stroke,
PikaAnchor *predec,
gdouble position)
{
g_return_val_if_fail (PIKA_IS_STROKE (stroke), FALSE);
return PIKA_STROKE_GET_CLASS (stroke)->point_is_movable (stroke, predec,
position);
}
static gboolean
pika_stroke_real_point_is_movable (PikaStroke *stroke,
PikaAnchor *predec,
gdouble position)
{
return FALSE;
}
void
pika_stroke_point_move_relative (PikaStroke *stroke,
PikaAnchor *predec,
gdouble position,
const PikaCoords *deltacoord,
PikaAnchorFeatureType feature)
{
g_return_if_fail (PIKA_IS_STROKE (stroke));
PIKA_STROKE_GET_CLASS (stroke)->point_move_relative (stroke, predec,
position, deltacoord,
feature);
}
static void
pika_stroke_real_point_move_relative (PikaStroke *stroke,
PikaAnchor *predec,
gdouble position,
const PikaCoords *deltacoord,
PikaAnchorFeatureType feature)
{
g_printerr ("pika_stroke_point_move_relative: default implementation\n");
}
void
pika_stroke_point_move_absolute (PikaStroke *stroke,
PikaAnchor *predec,
gdouble position,
const PikaCoords *coord,
PikaAnchorFeatureType feature)
{
g_return_if_fail (PIKA_IS_STROKE (stroke));
PIKA_STROKE_GET_CLASS (stroke)->point_move_absolute (stroke, predec,
position, coord,
feature);
}
static void
pika_stroke_real_point_move_absolute (PikaStroke *stroke,
PikaAnchor *predec,
gdouble position,
const PikaCoords *coord,
PikaAnchorFeatureType feature)
{
g_printerr ("pika_stroke_point_move_absolute: default implementation\n");
}
void
pika_stroke_close (PikaStroke *stroke)
{
g_return_if_fail (PIKA_IS_STROKE (stroke));
g_return_if_fail (g_queue_is_empty (stroke->anchors) == FALSE);
PIKA_STROKE_GET_CLASS (stroke)->close (stroke);
}
static void
pika_stroke_real_close (PikaStroke *stroke)
{
stroke->closed = TRUE;
g_object_notify (G_OBJECT (stroke), "closed");
}
void
pika_stroke_anchor_convert (PikaStroke *stroke,
PikaAnchor *anchor,
PikaAnchorFeatureType feature)
{
g_return_if_fail (PIKA_IS_STROKE (stroke));
PIKA_STROKE_GET_CLASS (stroke)->anchor_convert (stroke, anchor, feature);
}
static void
pika_stroke_real_anchor_convert (PikaStroke *stroke,
PikaAnchor *anchor,
PikaAnchorFeatureType feature)
{
g_printerr ("pika_stroke_anchor_convert: default implementation\n");
}
void
pika_stroke_anchor_delete (PikaStroke *stroke,
PikaAnchor *anchor)
{
g_return_if_fail (PIKA_IS_STROKE (stroke));
g_return_if_fail (anchor && anchor->type == PIKA_ANCHOR_ANCHOR);
PIKA_STROKE_GET_CLASS (stroke)->anchor_delete (stroke, anchor);
}
static void
pika_stroke_real_anchor_delete (PikaStroke *stroke,
PikaAnchor *anchor)
{
g_printerr ("pika_stroke_anchor_delete: default implementation\n");
}
PikaStroke *
pika_stroke_open (PikaStroke *stroke,
PikaAnchor *end_anchor)
{
g_return_val_if_fail (PIKA_IS_STROKE (stroke), NULL);
g_return_val_if_fail (end_anchor &&
end_anchor->type == PIKA_ANCHOR_ANCHOR, NULL);
return PIKA_STROKE_GET_CLASS (stroke)->open (stroke, end_anchor);
}
static PikaStroke *
pika_stroke_real_open (PikaStroke *stroke,
PikaAnchor *end_anchor)
{
g_printerr ("pika_stroke_open: default implementation\n");
return NULL;
}
gboolean
pika_stroke_anchor_is_insertable (PikaStroke *stroke,
PikaAnchor *predec,
gdouble position)
{
g_return_val_if_fail (PIKA_IS_STROKE (stroke), FALSE);
return PIKA_STROKE_GET_CLASS (stroke)->anchor_is_insertable (stroke,
predec,
position);
}
static gboolean
pika_stroke_real_anchor_is_insertable (PikaStroke *stroke,
PikaAnchor *predec,
gdouble position)
{
g_return_val_if_fail (PIKA_IS_STROKE (stroke), FALSE);
return FALSE;
}
PikaAnchor *
pika_stroke_anchor_insert (PikaStroke *stroke,
PikaAnchor *predec,
gdouble position)
{
g_return_val_if_fail (PIKA_IS_STROKE (stroke), NULL);
g_return_val_if_fail (predec->type == PIKA_ANCHOR_ANCHOR, NULL);
return PIKA_STROKE_GET_CLASS (stroke)->anchor_insert (stroke,
predec, position);
}
static PikaAnchor *
pika_stroke_real_anchor_insert (PikaStroke *stroke,
PikaAnchor *predec,
gdouble position)
{
g_return_val_if_fail (PIKA_IS_STROKE (stroke), NULL);
return NULL;
}
gboolean
pika_stroke_is_extendable (PikaStroke *stroke,
PikaAnchor *neighbor)
{
g_return_val_if_fail (PIKA_IS_STROKE (stroke), FALSE);
return PIKA_STROKE_GET_CLASS (stroke)->is_extendable (stroke, neighbor);
}
static gboolean
pika_stroke_real_is_extendable (PikaStroke *stroke,
PikaAnchor *neighbor)
{
return FALSE;
}
PikaAnchor *
pika_stroke_extend (PikaStroke *stroke,
const PikaCoords *coords,
PikaAnchor *neighbor,
PikaVectorExtendMode extend_mode)
{
g_return_val_if_fail (PIKA_IS_STROKE (stroke), NULL);
g_return_val_if_fail (!stroke->closed, NULL);
return PIKA_STROKE_GET_CLASS (stroke)->extend (stroke, coords,
neighbor, extend_mode);
}
static PikaAnchor *
pika_stroke_real_extend (PikaStroke *stroke,
const PikaCoords *coords,
PikaAnchor *neighbor,
PikaVectorExtendMode extend_mode)
{
g_printerr ("pika_stroke_extend: default implementation\n");
return NULL;
}
gboolean
pika_stroke_connect_stroke (PikaStroke *stroke,
PikaAnchor *anchor,
PikaStroke *extension,
PikaAnchor *neighbor)
{
g_return_val_if_fail (PIKA_IS_STROKE (stroke), FALSE);
g_return_val_if_fail (PIKA_IS_STROKE (extension), FALSE);
g_return_val_if_fail (stroke->closed == FALSE &&
extension->closed == FALSE, FALSE);
return PIKA_STROKE_GET_CLASS (stroke)->connect_stroke (stroke, anchor,
extension, neighbor);
}
gboolean
pika_stroke_real_connect_stroke (PikaStroke *stroke,
PikaAnchor *anchor,
PikaStroke *extension,
PikaAnchor *neighbor)
{
g_printerr ("pika_stroke_connect_stroke: default implementation\n");
return FALSE;
}
gboolean
pika_stroke_is_empty (PikaStroke *stroke)
{
g_return_val_if_fail (PIKA_IS_STROKE (stroke), FALSE);
return PIKA_STROKE_GET_CLASS (stroke)->is_empty (stroke);
}
static gboolean
pika_stroke_real_is_empty (PikaStroke *stroke)
{
return g_queue_is_empty (stroke->anchors);
}
gboolean
pika_stroke_reverse (PikaStroke *stroke)
{
g_return_val_if_fail (PIKA_IS_STROKE (stroke), FALSE);
return PIKA_STROKE_GET_CLASS (stroke)->reverse (stroke);
}
static gboolean
pika_stroke_real_reverse (PikaStroke *stroke)
{
g_queue_reverse (stroke->anchors);
/* keep the first node the same for closed strokes */
if (stroke->closed && stroke->anchors->length > 0)
g_queue_push_head_link (stroke->anchors,
g_queue_pop_tail_link (stroke->anchors));
return TRUE;
}
gboolean
pika_stroke_shift_start (PikaStroke *stroke,
PikaAnchor *new_start)
{
g_return_val_if_fail (PIKA_IS_STROKE (stroke), FALSE);
g_return_val_if_fail (new_start != NULL, FALSE);
return PIKA_STROKE_GET_CLASS (stroke)->shift_start (stroke, new_start);
}
static gboolean
pika_stroke_real_shift_start (PikaStroke *stroke,
PikaAnchor *new_start)
{
GList *link;
link = g_queue_find (stroke->anchors, new_start);
if (!link)
return FALSE;
if (link == stroke->anchors->head)
return TRUE;
stroke->anchors->tail->next = stroke->anchors->head;
stroke->anchors->head->prev = stroke->anchors->tail;
stroke->anchors->tail = link->prev;
stroke->anchors->head = link;
stroke->anchors->tail->next = NULL;
stroke->anchors->head->prev = NULL;
return TRUE;
}
gdouble
pika_stroke_get_length (PikaStroke *stroke,
gdouble precision)
{
g_return_val_if_fail (PIKA_IS_STROKE (stroke), 0.0);
return PIKA_STROKE_GET_CLASS (stroke)->get_length (stroke, precision);
}
static gdouble
pika_stroke_real_get_length (PikaStroke *stroke,
gdouble precision)
{
GArray *points;
gint i;
gdouble length;
PikaCoords difference;
if (g_queue_is_empty (stroke->anchors))
return -1;
points = pika_stroke_interpolate (stroke, precision, NULL);
if (points == NULL)
return -1;
length = 0;
for (i = 0; i < points->len - 1; i++ )
{
pika_coords_difference (&(g_array_index (points, PikaCoords, i)),
&(g_array_index (points, PikaCoords, i+1)),
&difference);
length += pika_coords_length (&difference);
}
g_array_free(points, TRUE);
return length;
}
gdouble
pika_stroke_get_distance (PikaStroke *stroke,
const PikaCoords *coord)
{
g_return_val_if_fail (PIKA_IS_STROKE (stroke), 0.0);
return PIKA_STROKE_GET_CLASS (stroke)->get_distance (stroke, coord);
}
static gdouble
pika_stroke_real_get_distance (PikaStroke *stroke,
const PikaCoords *coord)
{
g_printerr ("pika_stroke_get_distance: default implementation\n");
return 0.0;
}
GArray *
pika_stroke_interpolate (PikaStroke *stroke,
gdouble precision,
gboolean *ret_closed)
{
g_return_val_if_fail (PIKA_IS_STROKE (stroke), NULL);
return PIKA_STROKE_GET_CLASS (stroke)->interpolate (stroke, precision,
ret_closed);
}
static GArray *
pika_stroke_real_interpolate (PikaStroke *stroke,
gdouble precision,
gboolean *ret_closed)
{
g_printerr ("pika_stroke_interpolate: default implementation\n");
return NULL;
}
PikaStroke *
pika_stroke_duplicate (PikaStroke *stroke)
{
g_return_val_if_fail (PIKA_IS_STROKE (stroke), NULL);
return PIKA_STROKE_GET_CLASS (stroke)->duplicate (stroke);
}
static PikaStroke *
pika_stroke_real_duplicate (PikaStroke *stroke)
{
PikaStroke *new_stroke;
GList *list;
new_stroke = g_object_new (G_TYPE_FROM_INSTANCE (stroke),
"name", pika_object_get_name (stroke),
NULL);
g_queue_free_full (new_stroke->anchors, (GDestroyNotify) pika_anchor_free);
new_stroke->anchors = g_queue_copy (stroke->anchors);
for (list = new_stroke->anchors->head; list; list = g_list_next (list))
{
list->data = pika_anchor_copy (PIKA_ANCHOR (list->data));
}
new_stroke->closed = stroke->closed;
/* we do *not* copy the ID! */
return new_stroke;
}
PikaBezierDesc *
pika_stroke_make_bezier (PikaStroke *stroke)
{
g_return_val_if_fail (PIKA_IS_STROKE (stroke), NULL);
return PIKA_STROKE_GET_CLASS (stroke)->make_bezier (stroke);
}
static PikaBezierDesc *
pika_stroke_real_make_bezier (PikaStroke *stroke)
{
g_printerr ("pika_stroke_make_bezier: default implementation\n");
return NULL;
}
void
pika_stroke_translate (PikaStroke *stroke,
gdouble offset_x,
gdouble offset_y)
{
g_return_if_fail (PIKA_IS_STROKE (stroke));
PIKA_STROKE_GET_CLASS (stroke)->translate (stroke, offset_x, offset_y);
}
static void
pika_stroke_real_translate (PikaStroke *stroke,
gdouble offset_x,
gdouble offset_y)
{
GList *list;
for (list = stroke->anchors->head; list; list = g_list_next (list))
{
PikaAnchor *anchor = list->data;
anchor->position.x += offset_x;
anchor->position.y += offset_y;
}
}
void
pika_stroke_scale (PikaStroke *stroke,
gdouble scale_x,
gdouble scale_y)
{
g_return_if_fail (PIKA_IS_STROKE (stroke));
PIKA_STROKE_GET_CLASS (stroke)->scale (stroke, scale_x, scale_y);
}
static void
pika_stroke_real_scale (PikaStroke *stroke,
gdouble scale_x,
gdouble scale_y)
{
GList *list;
for (list = stroke->anchors->head; list; list = g_list_next (list))
{
PikaAnchor *anchor = list->data;
anchor->position.x *= scale_x;
anchor->position.y *= scale_y;
}
}
void
pika_stroke_rotate (PikaStroke *stroke,
gdouble center_x,
gdouble center_y,
gdouble angle)
{
g_return_if_fail (PIKA_IS_STROKE (stroke));
PIKA_STROKE_GET_CLASS (stroke)->rotate (stroke, center_x, center_y, angle);
}
static void
pika_stroke_real_rotate (PikaStroke *stroke,
gdouble center_x,
gdouble center_y,
gdouble angle)
{
PikaMatrix3 matrix;
angle = angle / 180.0 * G_PI;
pika_matrix3_identity (&matrix);
pika_transform_matrix_rotate_center (&matrix, center_x, center_y, angle);
pika_stroke_transform (stroke, &matrix, NULL);
}
void
pika_stroke_flip (PikaStroke *stroke,
PikaOrientationType flip_type,
gdouble axis)
{
g_return_if_fail (PIKA_IS_STROKE (stroke));
PIKA_STROKE_GET_CLASS (stroke)->flip (stroke, flip_type, axis);
}
static void
pika_stroke_real_flip (PikaStroke *stroke,
PikaOrientationType flip_type,
gdouble axis)
{
PikaMatrix3 matrix;
pika_matrix3_identity (&matrix);
pika_transform_matrix_flip (&matrix, flip_type, axis);
pika_stroke_transform (stroke, &matrix, NULL);
}
void
pika_stroke_flip_free (PikaStroke *stroke,
gdouble x1,
gdouble y1,
gdouble x2,
gdouble y2)
{
g_return_if_fail (PIKA_IS_STROKE (stroke));
PIKA_STROKE_GET_CLASS (stroke)->flip_free (stroke, x1, y1, x2, y2);
}
static void
pika_stroke_real_flip_free (PikaStroke *stroke,
gdouble x1,
gdouble y1,
gdouble x2,
gdouble y2)
{
/* x, y, width and height parameter in pika_transform_matrix_flip_free are unused */
PikaMatrix3 matrix;
pika_matrix3_identity (&matrix);
pika_transform_matrix_flip_free (&matrix, x1, y1, x2, y2);
pika_stroke_transform (stroke, &matrix, NULL);
}
/* transforms 'stroke' by 'matrix'. due to clipping, the transformation may
* result in multiple strokes.
*
* if 'ret_strokes' is not NULL, the transformed strokes are appended to the
* queue, and 'stroke' is left in an unspecified state. one of the resulting
* strokes may alias 'stroke'.
*
* if 'ret_strokes' is NULL, the transformation is performed in-place. if the
* transformation results in multiple strokes (which, atm, can only happen for
* non-affine transformation), the result is undefined.
*/
void
pika_stroke_transform (PikaStroke *stroke,
const PikaMatrix3 *matrix,
GQueue *ret_strokes)
{
g_return_if_fail (PIKA_IS_STROKE (stroke));
PIKA_STROKE_GET_CLASS (stroke)->transform (stroke, matrix, ret_strokes);
}
static void
pika_stroke_real_transform (PikaStroke *stroke,
const PikaMatrix3 *matrix,
GQueue *ret_strokes)
{
GList *list;
for (list = stroke->anchors->head; list; list = g_list_next (list))
{
PikaAnchor *anchor = list->data;
pika_matrix3_transform_point (matrix,
anchor->position.x,
anchor->position.y,
&anchor->position.x,
&anchor->position.y);
}
if (ret_strokes)
{
stroke->id = 0;
g_queue_push_tail (ret_strokes, g_object_ref (stroke));
}
}
GList *
pika_stroke_get_draw_anchors (PikaStroke *stroke)
{
g_return_val_if_fail (PIKA_IS_STROKE (stroke), NULL);
return PIKA_STROKE_GET_CLASS (stroke)->get_draw_anchors (stroke);
}
static GList *
pika_stroke_real_get_draw_anchors (PikaStroke *stroke)
{
GList *list;
GList *ret_list = NULL;
for (list = stroke->anchors->head; list; list = g_list_next (list))
{
if (PIKA_ANCHOR (list->data)->type == PIKA_ANCHOR_ANCHOR)
ret_list = g_list_prepend (ret_list, list->data);
}
return g_list_reverse (ret_list);
}
GList *
pika_stroke_get_draw_controls (PikaStroke *stroke)
{
g_return_val_if_fail (PIKA_IS_STROKE (stroke), NULL);
return PIKA_STROKE_GET_CLASS (stroke)->get_draw_controls (stroke);
}
static GList *
pika_stroke_real_get_draw_controls (PikaStroke *stroke)
{
GList *list;
GList *ret_list = NULL;
for (list = stroke->anchors->head; list; list = g_list_next (list))
{
PikaAnchor *anchor = list->data;
if (anchor->type == PIKA_ANCHOR_CONTROL)
{
PikaAnchor *next = list->next ? list->next->data : NULL;
PikaAnchor *prev = list->prev ? list->prev->data : NULL;
if (next && next->type == PIKA_ANCHOR_ANCHOR && next->selected)
{
/* Ok, this is a hack.
* The idea is to give control points at the end of a
* stroke a higher priority for the interactive tool.
*/
if (prev)
ret_list = g_list_prepend (ret_list, anchor);
else
ret_list = g_list_append (ret_list, anchor);
}
else if (prev && prev->type == PIKA_ANCHOR_ANCHOR && prev->selected)
{
/* same here... */
if (next)
ret_list = g_list_prepend (ret_list, anchor);
else
ret_list = g_list_append (ret_list, anchor);
}
}
}
return g_list_reverse (ret_list);
}
GArray *
pika_stroke_get_draw_lines (PikaStroke *stroke)
{
g_return_val_if_fail (PIKA_IS_STROKE (stroke), NULL);
return PIKA_STROKE_GET_CLASS (stroke)->get_draw_lines (stroke);
}
static GArray *
pika_stroke_real_get_draw_lines (PikaStroke *stroke)
{
GList *list;
GArray *ret_lines = NULL;
gint count = 0;
for (list = stroke->anchors->head; list; list = g_list_next (list))
{
PikaAnchor *anchor = list->data;
if (anchor->type == PIKA_ANCHOR_ANCHOR && anchor->selected)
{
if (list->next)
{
PikaAnchor *next = list->next->data;
if (count == 0)
ret_lines = g_array_new (FALSE, FALSE, sizeof (PikaCoords));
ret_lines = g_array_append_val (ret_lines, anchor->position);
ret_lines = g_array_append_val (ret_lines, next->position);
count += 1;
}
if (list->prev)
{
PikaAnchor *prev = list->prev->data;
if (count == 0)
ret_lines = g_array_new (FALSE, FALSE, sizeof (PikaCoords));
ret_lines = g_array_append_val (ret_lines, anchor->position);
ret_lines = g_array_append_val (ret_lines, prev->position);
count += 1;
}
}
}
return ret_lines;
}
GArray *
pika_stroke_control_points_get (PikaStroke *stroke,
gboolean *ret_closed)
{
g_return_val_if_fail (PIKA_IS_STROKE (stroke), NULL);
return PIKA_STROKE_GET_CLASS (stroke)->control_points_get (stroke,
ret_closed);
}
static GArray *
pika_stroke_real_control_points_get (PikaStroke *stroke,
gboolean *ret_closed)
{
guint num_anchors;
GArray *ret_array;
GList *list;
num_anchors = g_queue_get_length (stroke->anchors);
ret_array = g_array_sized_new (FALSE, FALSE,
sizeof (PikaAnchor), num_anchors);
for (list = stroke->anchors->head; list; list = g_list_next (list))
{
g_array_append_vals (ret_array, list->data, 1);
}
if (ret_closed)
*ret_closed = stroke->closed;
return ret_array;
}
gboolean
pika_stroke_get_point_at_dist (PikaStroke *stroke,
gdouble dist,
gdouble precision,
PikaCoords *position,
gdouble *slope)
{
g_return_val_if_fail (PIKA_IS_STROKE (stroke), FALSE);
return PIKA_STROKE_GET_CLASS (stroke)->get_point_at_dist (stroke,
dist,
precision,
position,
slope);
}
static gboolean
pika_stroke_real_get_point_at_dist (PikaStroke *stroke,
gdouble dist,
gdouble precision,
PikaCoords *position,
gdouble *slope)
{
GArray *points;
gint i;
gdouble length;
gdouble segment_length;
gboolean ret = FALSE;
PikaCoords difference;
points = pika_stroke_interpolate (stroke, precision, NULL);
if (points == NULL)
return ret;
length = 0;
for (i=0; i < points->len - 1; i++)
{
pika_coords_difference (&(g_array_index (points, PikaCoords , i)),
&(g_array_index (points, PikaCoords , i+1)),
&difference);
segment_length = pika_coords_length (&difference);
if (segment_length == 0 || length + segment_length < dist )
{
length += segment_length;
}
else
{
/* x = x1 + (x2 - x1 ) u */
/* x = x1 (1-u) + u x2 */
gdouble u = (dist - length) / segment_length;
pika_coords_mix (1 - u, &(g_array_index (points, PikaCoords , i)),
u, &(g_array_index (points, PikaCoords , i+1)),
position);
if (difference.x == 0)
*slope = G_MAXDOUBLE;
else
*slope = difference.y / difference.x;
ret = TRUE;
break;
}
}
g_array_free (points, TRUE);
return ret;
}