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gimp/app/vectors/gimpvectors.c

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/* The GIMP -- an image manipulation program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* gimpvectors.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 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 "glib-object.h"
#include "vectors-types.h"
#include "core/gimpimage.h"
#include "gimpanchor.h"
#include "gimpstroke.h"
#include "gimpvectors.h"
#include "gimpvectors-preview.h"
/* private variables */
static GimpItemClass *parent_class = NULL;
static void gimp_vectors_class_init (GimpVectorsClass *klass);
static void gimp_vectors_init (GimpVectors *vectors);
static void gimp_vectors_finalize (GObject *object);
GType
gimp_vectors_get_type (void)
{
static GType vectors_type = 0;
if (! vectors_type)
{
static const GTypeInfo vectors_info =
{
sizeof (GimpVectorsClass),
(GBaseInitFunc) NULL,
(GBaseFinalizeFunc) NULL,
(GClassInitFunc) gimp_vectors_class_init,
NULL, /* class_finalize */
NULL, /* class_data */
sizeof (GimpVectors),
0, /* n_preallocs */
(GInstanceInitFunc) gimp_vectors_init,
};
vectors_type = g_type_register_static (GIMP_TYPE_ITEM,
"GimpVectors",
&vectors_info, 0);
}
return vectors_type;
}
static void
gimp_vectors_class_init (GimpVectorsClass *klass)
{
GObjectClass *object_class;
GimpObjectClass *gimp_object_class;
GimpViewableClass *viewable_class;
object_class = G_OBJECT_CLASS (klass);
gimp_object_class = GIMP_OBJECT_CLASS (klass);
viewable_class = GIMP_VIEWABLE_CLASS (klass);
parent_class = g_type_class_peek_parent (klass);
object_class->finalize = gimp_vectors_finalize;
/* gimp_object_class->get_memsize = gimp_vectors_get_memsize; */
viewable_class->get_new_preview = gimp_vectors_get_new_preview;
klass->changed = NULL;
klass->stroke_add = NULL;
klass->stroke_get = NULL;
klass->stroke_get_next = NULL;
klass->stroke_get_length = NULL;
klass->anchor_get = NULL;
klass->get_length = NULL;
klass->get_distance = NULL;
klass->interpolate = NULL;
klass->make_bezier = NULL;
}
static void
gimp_vectors_init (GimpVectors *vectors)
{
vectors->strokes = NULL;
};
static void
gimp_vectors_finalize (GObject *object)
{
G_OBJECT_CLASS (parent_class)->finalize (object);
}
/* Calling the virtual functions */
GimpAnchor *
gimp_vectors_anchor_get (const GimpVectors *vectors,
const GimpCoords *coord,
GimpStroke **ret_stroke)
{
GimpVectorsClass *vectors_class;
g_return_val_if_fail (GIMP_IS_VECTORS (vectors), NULL);
vectors_class = GIMP_VECTORS_GET_CLASS (vectors);
if (vectors_class->anchor_get)
return vectors_class->anchor_get (vectors, coord, ret_stroke);
else
{
gdouble dx, dy, mindist;
GimpStroke *stroke;
GimpAnchor *anchor = NULL, *minanchor = NULL;
mindist = -1;
for (stroke = vectors->strokes; stroke; stroke = stroke->next)
{
anchor = gimp_stroke_anchor_get (stroke, coord);
if (anchor)
{
dx = coord->x - anchor->position.x;
dy = coord->y - anchor->position.y;
if (mindist > dx * dx + dy * dy || mindist < 0)
{
mindist = dx * dx + dy * dy;
minanchor = anchor;
if (ret_stroke)
*ret_stroke = stroke;
}
}
}
return minanchor;
}
return NULL;
}
void
gimp_vectors_stroke_add (GimpVectors *vectors,
GimpStroke *stroke)
{
GimpVectorsClass *vectors_class;
g_return_if_fail (GIMP_IS_VECTORS (vectors));
g_return_if_fail (GIMP_IS_STROKE (stroke));
vectors_class = GIMP_VECTORS_GET_CLASS (vectors);
if (vectors_class->stroke_add)
{
vectors_class->stroke_add (vectors, stroke);
}
else
{
stroke->next = vectors->strokes;
vectors->strokes = stroke;
g_object_ref (stroke);
}
}
GimpStroke *
gimp_vectors_stroke_get (const GimpVectors *vectors,
const GimpCoords *coord)
{
GimpVectorsClass *vectors_class;
g_return_val_if_fail (GIMP_IS_VECTORS (vectors), NULL);
vectors_class = GIMP_VECTORS_GET_CLASS (vectors);
if (vectors_class->stroke_get)
return vectors_class->stroke_get (vectors, coord);
else
{
gdouble dx, dy, mindist;
GimpStroke *stroke;
GimpStroke *minstroke = NULL;
GimpAnchor *anchor = NULL;
mindist = -1;
stroke = GIMP_STROKE (vectors->strokes);
while (stroke)
{
anchor = gimp_stroke_anchor_get (stroke, coord);
if (anchor)
{
dx = coord->x - anchor->position.x;
dy = coord->y - anchor->position.y;
if (mindist > dx * dx + dy * dy || mindist < 0)
{
mindist = dx * dx + dy * dy;
minstroke = stroke;
}
}
stroke = stroke->next;
}
return minstroke;
}
return NULL;
}
GimpStroke *
gimp_vectors_stroke_get_next (const GimpVectors *vectors,
const GimpStroke *prev)
{
GimpVectorsClass *vectors_class;
g_return_val_if_fail (GIMP_IS_VECTORS (vectors), NULL);
vectors_class = GIMP_VECTORS_GET_CLASS (vectors);
if (vectors_class->stroke_get_next)
return vectors_class->stroke_get_next (vectors, prev);
else
{
if (!prev)
{
return vectors->strokes;
}
else
{
g_return_val_if_fail (GIMP_IS_STROKE (prev), NULL);
return prev->next;
}
}
return NULL;
}
gdouble
gimp_vectors_stroke_get_length (const GimpVectors *vectors,
const GimpStroke *prev)
{
GimpVectorsClass *vectors_class;
g_return_val_if_fail (GIMP_IS_VECTORS (vectors), 0);
vectors_class = GIMP_VECTORS_GET_CLASS (vectors);
if (vectors_class->stroke_get_length)
return vectors_class->stroke_get_length (vectors, prev);
else
g_printerr ("gimp_vectors_stroke_get_length: default implementation\n");
return 0;
}
gdouble
gimp_vectors_get_length (const GimpVectors *vectors,
const GimpAnchor *start)
{
GimpVectorsClass *vectors_class;
g_return_val_if_fail (GIMP_IS_VECTORS (vectors), 0);
vectors_class = GIMP_VECTORS_GET_CLASS (vectors);
if (vectors_class->get_length)
return vectors_class->get_length (vectors, start);
else
g_printerr ("gimp_vectors_get_length: default implementation\n");
return 0;
}
gdouble
gimp_vectors_get_distance (const GimpVectors *vectors,
const GimpCoords *coord)
{
GimpVectorsClass *vectors_class;
g_return_val_if_fail (GIMP_IS_VECTORS (vectors), 0);
vectors_class = GIMP_VECTORS_GET_CLASS (vectors);
if (vectors_class->get_distance)
return vectors_class->get_distance (vectors, coord);
else
g_printerr ("gimp_vectors_get_distance: default implementation\n");
return 0;
}
gint
gimp_vectors_interpolate (const GimpVectors *vectors,
const GimpStroke *stroke,
const gdouble precision,
const gint max_points,
GimpCoords *ret_coords)
{
GimpVectorsClass *vectors_class;
g_return_val_if_fail (GIMP_IS_VECTORS (vectors), 0);
vectors_class = GIMP_VECTORS_GET_CLASS (vectors);
if (vectors_class->interpolate)
return vectors_class->interpolate (vectors, stroke, precision, max_points, ret_coords);
else
g_printerr ("gimp_vectors_interpolate: default implementation\n");
return 0;
}
GimpVectors *
gimp_vectors_make_bezier (const GimpVectors *vectors)
{
GimpVectorsClass *vectors_class;
g_return_val_if_fail (GIMP_IS_VECTORS (vectors), NULL);
vectors_class = GIMP_VECTORS_GET_CLASS (vectors);
if (vectors_class->make_bezier)
return vectors_class->make_bezier (vectors);
else
g_printerr ("gimp_vectors_make_bezier: default implementation\n");
return NULL;
}
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