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PIKApp
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PIKApp/app/display/pikacanvasarc.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
*
* pikacanvasarc.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 "libpikamath/pikamath.h"
#include "display-types.h"
#include "core/pika-cairo.h"
#include "pikacanvasarc.h"
#include "pikadisplayshell.h"
enum
{
PROP_0,
PROP_CENTER_X,
PROP_CENTER_Y,
PROP_RADIUS_X,
PROP_RADIUS_Y,
PROP_START_ANGLE,
PROP_SLICE_ANGLE,
PROP_FILLED
};
typedef struct _PikaCanvasArcPrivate PikaCanvasArcPrivate;
struct _PikaCanvasArcPrivate
{
gdouble center_x;
gdouble center_y;
gdouble radius_x;
gdouble radius_y;
gdouble start_angle;
gdouble slice_angle;
gboolean filled;
};
#define GET_PRIVATE(arc) \
((PikaCanvasArcPrivate *) pika_canvas_arc_get_instance_private ((PikaCanvasArc *) (arc)))
/* local function prototypes */
static void pika_canvas_arc_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec);
static void pika_canvas_arc_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec);
static void pika_canvas_arc_draw (PikaCanvasItem *item,
cairo_t *cr);
static cairo_region_t * pika_canvas_arc_get_extents (PikaCanvasItem *item);
G_DEFINE_TYPE_WITH_PRIVATE (PikaCanvasArc, pika_canvas_arc,
PIKA_TYPE_CANVAS_ITEM)
#define parent_class pika_canvas_arc_parent_class
static void
pika_canvas_arc_class_init (PikaCanvasArcClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
PikaCanvasItemClass *item_class = PIKA_CANVAS_ITEM_CLASS (klass);
object_class->set_property = pika_canvas_arc_set_property;
object_class->get_property = pika_canvas_arc_get_property;
item_class->draw = pika_canvas_arc_draw;
item_class->get_extents = pika_canvas_arc_get_extents;
g_object_class_install_property (object_class, PROP_CENTER_X,
g_param_spec_double ("center-x", NULL, NULL,
-PIKA_MAX_IMAGE_SIZE,
PIKA_MAX_IMAGE_SIZE, 0,
PIKA_PARAM_READWRITE));
g_object_class_install_property (object_class, PROP_CENTER_Y,
g_param_spec_double ("center-y", NULL, NULL,
-PIKA_MAX_IMAGE_SIZE,
PIKA_MAX_IMAGE_SIZE, 0,
PIKA_PARAM_READWRITE));
g_object_class_install_property (object_class, PROP_RADIUS_X,
g_param_spec_double ("radius-x", NULL, NULL,
0, PIKA_MAX_IMAGE_SIZE, 0,
PIKA_PARAM_READWRITE));
g_object_class_install_property (object_class, PROP_RADIUS_Y,
g_param_spec_double ("radius-y", NULL, NULL,
0, PIKA_MAX_IMAGE_SIZE, 0,
PIKA_PARAM_READWRITE));
g_object_class_install_property (object_class, PROP_START_ANGLE,
g_param_spec_double ("start-angle", NULL, NULL,
-1000, 1000, 0,
PIKA_PARAM_READWRITE));
g_object_class_install_property (object_class, PROP_SLICE_ANGLE,
g_param_spec_double ("slice-angle", NULL, NULL,
-1000, 1000, 2 * G_PI,
PIKA_PARAM_READWRITE));
g_object_class_install_property (object_class, PROP_FILLED,
g_param_spec_boolean ("filled", NULL, NULL,
FALSE,
PIKA_PARAM_READWRITE));
}
static void
pika_canvas_arc_init (PikaCanvasArc *arc)
{
}
static void
pika_canvas_arc_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec)
{
PikaCanvasArcPrivate *private = GET_PRIVATE (object);
switch (property_id)
{
case PROP_CENTER_X:
private->center_x = g_value_get_double (value);
break;
case PROP_CENTER_Y:
private->center_y = g_value_get_double (value);
break;
case PROP_RADIUS_X:
private->radius_x = g_value_get_double (value);
break;
case PROP_RADIUS_Y:
private->radius_y = g_value_get_double (value);
break;
case PROP_START_ANGLE:
private->start_angle = g_value_get_double (value);
break;
case PROP_SLICE_ANGLE:
private->slice_angle = g_value_get_double (value);
break;
case PROP_FILLED:
private->filled = g_value_get_boolean (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
pika_canvas_arc_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec)
{
PikaCanvasArcPrivate *private = GET_PRIVATE (object);
switch (property_id)
{
case PROP_CENTER_X:
g_value_set_double (value, private->center_x);
break;
case PROP_CENTER_Y:
g_value_set_double (value, private->center_y);
break;
case PROP_RADIUS_X:
g_value_set_double (value, private->radius_x);
break;
case PROP_RADIUS_Y:
g_value_set_double (value, private->radius_y);
break;
case PROP_START_ANGLE:
g_value_set_double (value, private->start_angle);
break;
case PROP_SLICE_ANGLE:
g_value_set_double (value, private->slice_angle);
break;
case PROP_FILLED:
g_value_set_boolean (value, private->filled);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
pika_canvas_arc_transform (PikaCanvasItem *item,
gdouble *center_x,
gdouble *center_y,
gdouble *radius_x,
gdouble *radius_y)
{
PikaCanvasArcPrivate *private = GET_PRIVATE (item);
gdouble x1, y1;
gdouble x2, y2;
pika_canvas_item_transform_xy_f (item,
private->center_x - private->radius_x,
private->center_y - private->radius_y,
&x1, &y1);
pika_canvas_item_transform_xy_f (item,
private->center_x + private->radius_x,
private->center_y + private->radius_y,
&x2, &y2);
x1 = floor (x1);
y1 = floor (y1);
x2 = ceil (x2);
y2 = ceil (y2);
*center_x = (x1 + x2) / 2.0;
*center_y = (y1 + y2) / 2.0;
*radius_x = (x2 - x1) / 2.0;
*radius_y = (y2 - y1) / 2.0;
if (! private->filled)
{
*radius_x = MAX (*radius_x - 0.5, 0.0);
*radius_y = MAX (*radius_y - 0.5, 0.0);
}
/* avoid cairo_scale (cr, 0.0, 0.0) */
if (*radius_x == 0.0) *radius_x = 0.000001;
if (*radius_y == 0.0) *radius_y = 0.000001;
}
static void
pika_canvas_arc_draw (PikaCanvasItem *item,
cairo_t *cr)
{
PikaCanvasArcPrivate *private = GET_PRIVATE (item);
gdouble center_x, center_y;
gdouble radius_x, radius_y;
pika_canvas_arc_transform (item,
&center_x, &center_y,
&radius_x, &radius_y);
cairo_save (cr);
cairo_translate (cr, center_x, center_y);
cairo_scale (cr, radius_x, radius_y);
pika_cairo_arc (cr, 0.0, 0.0, 1.0,
private->start_angle, private->slice_angle);
cairo_restore (cr);
if (private->filled)
_pika_canvas_item_fill (item, cr);
else
_pika_canvas_item_stroke (item, cr);
}
static cairo_region_t *
pika_canvas_arc_get_extents (PikaCanvasItem *item)
{
PikaCanvasArcPrivate *private = GET_PRIVATE (item);
cairo_region_t *region;
cairo_rectangle_int_t rectangle;
gdouble center_x, center_y;
gdouble radius_x, radius_y;
pika_canvas_arc_transform (item,
&center_x, &center_y,
&radius_x, &radius_y);
rectangle.x = floor (center_x - radius_x - 1.5);
rectangle.y = floor (center_y - radius_y - 1.5);
rectangle.width = ceil (center_x + radius_x + 1.5) - rectangle.x;
rectangle.height = ceil (center_y + radius_y + 1.5) - rectangle.y;
region = cairo_region_create_rectangle (&rectangle);
if (! private->filled &&
rectangle.width > 64 * 1.43 &&
rectangle.height > 64 * 1.43)
{
radius_x *= 0.7;
radius_y *= 0.7;
rectangle.x = ceil (center_x - radius_x + 1.5);
rectangle.y = ceil (center_y - radius_y + 1.5);
rectangle.width = floor (center_x + radius_x - 1.5) - rectangle.x;
rectangle.height = floor (center_y + radius_y - 1.5) - rectangle.y;
cairo_region_subtract_rectangle (region, &rectangle);
}
return region;
}
PikaCanvasItem *
pika_canvas_arc_new (PikaDisplayShell *shell,
gdouble center_x,
gdouble center_y,
gdouble radius_x,
gdouble radius_y,
gdouble start_angle,
gdouble slice_angle,
gboolean filled)
{
g_return_val_if_fail (PIKA_IS_DISPLAY_SHELL (shell), NULL);
return g_object_new (PIKA_TYPE_CANVAS_ARC,
"shell", shell,
"center-x", center_x,
"center-y", center_y,
"radius-x", radius_x,
"radius-y", radius_y,
"start-angle", start_angle,
"slice-angle", slice_angle,
"filled", filled,
NULL);
}
void
pika_canvas_arc_set (PikaCanvasItem *arc,
gdouble center_x,
gdouble center_y,
gdouble radius_x,
gdouble radius_y,
gdouble start_angle,
gdouble slice_angle)
{
g_return_if_fail (PIKA_IS_CANVAS_ARC (arc));
pika_canvas_item_begin_change (arc);
g_object_set (arc,
"center-x", center_x,
"center-y", center_y,
"radius-x", radius_x,
"radius-y", radius_y,
"start-angle", start_angle,
"slice-angle", slice_angle,
NULL);
pika_canvas_item_end_change (arc);
}
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