PIKApp/app/display/pikacanvasguide.c

300 lines
9.4 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
*
* pikacanvasguide.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 "pikacanvas-style.h"
#include "pikacanvasguide.h"
#include "pikadisplayshell.h"
enum
{
PROP_0,
PROP_ORIENTATION,
PROP_POSITION,
PROP_STYLE
};
typedef struct _PikaCanvasGuidePrivate PikaCanvasGuidePrivate;
struct _PikaCanvasGuidePrivate
{
PikaOrientationType orientation;
gint position;
PikaGuideStyle style;
};
#define GET_PRIVATE(guide) \
((PikaCanvasGuidePrivate *) pika_canvas_guide_get_instance_private ((PikaCanvasGuide *) (guide)))
/* local function prototypes */
static void pika_canvas_guide_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec);
static void pika_canvas_guide_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec);
static void pika_canvas_guide_draw (PikaCanvasItem *item,
cairo_t *cr);
static cairo_region_t * pika_canvas_guide_get_extents (PikaCanvasItem *item);
static void pika_canvas_guide_stroke (PikaCanvasItem *item,
cairo_t *cr);
G_DEFINE_TYPE_WITH_PRIVATE (PikaCanvasGuide, pika_canvas_guide,
PIKA_TYPE_CANVAS_ITEM)
#define parent_class pika_canvas_guide_parent_class
static void
pika_canvas_guide_class_init (PikaCanvasGuideClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
PikaCanvasItemClass *item_class = PIKA_CANVAS_ITEM_CLASS (klass);
object_class->set_property = pika_canvas_guide_set_property;
object_class->get_property = pika_canvas_guide_get_property;
item_class->draw = pika_canvas_guide_draw;
item_class->get_extents = pika_canvas_guide_get_extents;
item_class->stroke = pika_canvas_guide_stroke;
g_object_class_install_property (object_class, PROP_ORIENTATION,
g_param_spec_enum ("orientation", NULL, NULL,
PIKA_TYPE_ORIENTATION_TYPE,
PIKA_ORIENTATION_HORIZONTAL,
PIKA_PARAM_READWRITE));
g_object_class_install_property (object_class, PROP_POSITION,
g_param_spec_int ("position", NULL, NULL,
-PIKA_MAX_IMAGE_SIZE,
PIKA_MAX_IMAGE_SIZE, 0,
PIKA_PARAM_READWRITE));
g_object_class_install_property (object_class, PROP_STYLE,
g_param_spec_enum ("style", NULL, NULL,
PIKA_TYPE_GUIDE_STYLE,
PIKA_GUIDE_STYLE_NONE,
PIKA_PARAM_READWRITE));
}
static void
pika_canvas_guide_init (PikaCanvasGuide *guide)
{
}
static void
pika_canvas_guide_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec)
{
PikaCanvasGuidePrivate *private = GET_PRIVATE (object);
switch (property_id)
{
case PROP_ORIENTATION:
private->orientation = g_value_get_enum (value);
break;
case PROP_POSITION:
private->position = g_value_get_int (value);
break;
case PROP_STYLE:
private->style = g_value_get_enum (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
pika_canvas_guide_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec)
{
PikaCanvasGuidePrivate *private = GET_PRIVATE (object);
switch (property_id)
{
case PROP_ORIENTATION:
g_value_set_enum (value, private->orientation);
break;
case PROP_POSITION:
g_value_set_int (value, private->position);
break;
case PROP_STYLE:
g_value_set_enum (value, private->style);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
pika_canvas_guide_transform (PikaCanvasItem *item,
gdouble *x1,
gdouble *y1,
gdouble *x2,
gdouble *y2)
{
PikaCanvasGuidePrivate *private = GET_PRIVATE (item);
GtkWidget *canvas = pika_canvas_item_get_canvas (item);
GtkAllocation allocation;
gint max_outside;
gint x, y;
gtk_widget_get_allocation (canvas, &allocation);
max_outside = allocation.width + allocation.height;
*x1 = -max_outside;
*y1 = -max_outside;
*x2 = allocation.width + max_outside;
*y2 = allocation.height + max_outside;
switch (private->orientation)
{
case PIKA_ORIENTATION_HORIZONTAL:
pika_canvas_item_transform_xy (item, 0, private->position, &x, &y);
*y1 = *y2 = y + 0.5;
break;
case PIKA_ORIENTATION_VERTICAL:
pika_canvas_item_transform_xy (item, private->position, 0, &x, &y);
*x1 = *x2 = x + 0.5;
break;
case PIKA_ORIENTATION_UNKNOWN:
return;
}
}
static void
pika_canvas_guide_draw (PikaCanvasItem *item,
cairo_t *cr)
{
gdouble x1, y1;
gdouble x2, y2;
pika_canvas_guide_transform (item, &x1, &y1, &x2, &y2);
cairo_move_to (cr, x1, y1);
cairo_line_to (cr, x2, y2);
_pika_canvas_item_stroke (item, cr);
}
static cairo_region_t *
pika_canvas_guide_get_extents (PikaCanvasItem *item)
{
cairo_rectangle_int_t rectangle;
gdouble x1, y1;
gdouble x2, y2;
pika_canvas_guide_transform (item, &x1, &y1, &x2, &y2);
rectangle.x = MIN (x1, x2) - 1.5;
rectangle.y = MIN (y1, y2) - 1.5;
rectangle.width = ABS (x2 - x1) + 3.0;
rectangle.height = ABS (y2 - y1) + 3.0;
return cairo_region_create_rectangle (&rectangle);
}
static void
pika_canvas_guide_stroke (PikaCanvasItem *item,
cairo_t *cr)
{
PikaCanvasGuidePrivate *private = GET_PRIVATE (item);
if (private->style != PIKA_GUIDE_STYLE_NONE)
{
PikaDisplayShell *shell = pika_canvas_item_get_shell (item);
pika_canvas_set_guide_style (pika_canvas_item_get_canvas (item), cr,
private->style,
pika_canvas_item_get_highlight (item),
shell->offset_x, shell->offset_y);
cairo_stroke (cr);
}
else
{
PIKA_CANVAS_ITEM_CLASS (parent_class)->stroke (item, cr);
}
}
PikaCanvasItem *
pika_canvas_guide_new (PikaDisplayShell *shell,
PikaOrientationType orientation,
gint position,
PikaGuideStyle style)
{
g_return_val_if_fail (PIKA_IS_DISPLAY_SHELL (shell), NULL);
return g_object_new (PIKA_TYPE_CANVAS_GUIDE,
"shell", shell,
"orientation", orientation,
"position", position,
"style", style,
NULL);
}
void
pika_canvas_guide_set (PikaCanvasItem *guide,
PikaOrientationType orientation,
gint position)
{
g_return_if_fail (PIKA_IS_CANVAS_GUIDE (guide));
pika_canvas_item_begin_change (guide);
g_object_set (guide,
"orientation", orientation,
"position", position,
NULL);
pika_canvas_item_end_change (guide);
}