PIKApp/app/display/pikacanvaspen.c

236 lines
7.0 KiB
C

/* 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
*
* pikacanvaspen.c
* Copyright (C) 2010 Michael Natterer <mitch@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 <gegl.h>
#include <gtk/gtk.h>
#include "libpikabase/pikabase.h"
#include "libpikacolor/pikacolor.h"
#include "libpikamath/pikamath.h"
#include "display-types.h"
#include "core/pikacontext.h"
#include "core/pikaparamspecs.h"
#include "pikacanvas-style.h"
#include "pikacanvaspen.h"
#include "pikadisplayshell.h"
enum
{
PROP_0,
PROP_COLOR,
PROP_WIDTH
};
typedef struct _PikaCanvasPenPrivate PikaCanvasPenPrivate;
struct _PikaCanvasPenPrivate
{
PikaRGB color;
gint width;
};
#define GET_PRIVATE(pen) \
((PikaCanvasPenPrivate *) pika_canvas_pen_get_instance_private ((PikaCanvasPen *) (pen)))
/* local function prototypes */
static void pika_canvas_pen_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec);
static void pika_canvas_pen_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec);
static cairo_region_t * pika_canvas_pen_get_extents (PikaCanvasItem *item);
static void pika_canvas_pen_stroke (PikaCanvasItem *item,
cairo_t *cr);
G_DEFINE_TYPE_WITH_PRIVATE (PikaCanvasPen, pika_canvas_pen,
PIKA_TYPE_CANVAS_POLYGON)
#define parent_class pika_canvas_pen_parent_class
static void
pika_canvas_pen_class_init (PikaCanvasPenClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
PikaCanvasItemClass *item_class = PIKA_CANVAS_ITEM_CLASS (klass);
object_class->set_property = pika_canvas_pen_set_property;
object_class->get_property = pika_canvas_pen_get_property;
item_class->get_extents = pika_canvas_pen_get_extents;
item_class->stroke = pika_canvas_pen_stroke;
g_object_class_install_property (object_class, PROP_COLOR,
pika_param_spec_rgb ("color", NULL, NULL,
FALSE, NULL,
PIKA_PARAM_READWRITE));
g_object_class_install_property (object_class, PROP_WIDTH,
g_param_spec_int ("width", NULL, NULL,
1, G_MAXINT, 1,
PIKA_PARAM_READWRITE));
}
static void
pika_canvas_pen_init (PikaCanvasPen *pen)
{
}
static void
pika_canvas_pen_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec)
{
PikaCanvasPenPrivate *private = GET_PRIVATE (object);
switch (property_id)
{
case PROP_COLOR:
pika_value_get_rgb (value, &private->color);
break;
case PROP_WIDTH:
private->width = g_value_get_int (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
pika_canvas_pen_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec)
{
PikaCanvasPenPrivate *private = GET_PRIVATE (object);
switch (property_id)
{
case PROP_COLOR:
pika_value_set_rgb (value, &private->color);
break;
case PROP_WIDTH:
g_value_set_int (value, private->width);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static cairo_region_t *
pika_canvas_pen_get_extents (PikaCanvasItem *item)
{
PikaCanvasPenPrivate *private = GET_PRIVATE (item);
cairo_region_t *region;
region = PIKA_CANVAS_ITEM_CLASS (parent_class)->get_extents (item);
if (region)
{
cairo_rectangle_int_t rectangle;
cairo_region_get_extents (region, &rectangle);
rectangle.x -= ceil (private->width / 2.0);
rectangle.y -= ceil (private->width / 2.0);
rectangle.width += private->width + 1;
rectangle.height += private->width + 1;
cairo_region_union_rectangle (region, &rectangle);
}
return region;
}
static void
pika_canvas_pen_stroke (PikaCanvasItem *item,
cairo_t *cr)
{
PikaCanvasPenPrivate *private = GET_PRIVATE (item);
pika_canvas_set_pen_style (pika_canvas_item_get_canvas (item), cr,
&private->color, private->width);
cairo_stroke (cr);
}
PikaCanvasItem *
pika_canvas_pen_new (PikaDisplayShell *shell,
const PikaVector2 *points,
gint n_points,
PikaContext *context,
PikaActiveColor color,
gint width)
{
PikaCanvasItem *item;
PikaArray *array;
PikaRGB rgb;
g_return_val_if_fail (PIKA_IS_DISPLAY_SHELL (shell), NULL);
g_return_val_if_fail (points != NULL && n_points > 1, NULL);
g_return_val_if_fail (PIKA_IS_CONTEXT (context), NULL);
array = pika_array_new ((const guint8 *) points,
n_points * sizeof (PikaVector2), TRUE);
switch (color)
{
case PIKA_ACTIVE_COLOR_FOREGROUND:
pika_context_get_foreground (context, &rgb);
break;
case PIKA_ACTIVE_COLOR_BACKGROUND:
pika_context_get_background (context, &rgb);
break;
}
item = g_object_new (PIKA_TYPE_CANVAS_PEN,
"shell", shell,
"points", array,
"color", &rgb,
"width", width,
NULL);
pika_array_free (array);
return item;
}