PIKApp/app/display/pikacanvasgrid.c

419 lines
12 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
*
* pikacanvasgrid.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 "libpikaconfig/pikaconfig.h"
#include "display-types.h"
#include "core/pikagrid.h"
#include "core/pikaimage.h"
#include "pikacanvas-style.h"
#include "pikacanvasgrid.h"
#include "pikacanvasitem-utils.h"
#include "pikadisplayshell.h"
#include "pikadisplayshell-scale.h"
enum
{
PROP_0,
PROP_GRID,
PROP_GRID_STYLE
};
typedef struct _PikaCanvasGridPrivate PikaCanvasGridPrivate;
struct _PikaCanvasGridPrivate
{
PikaGrid *grid;
gboolean grid_style;
};
#define GET_PRIVATE(grid) \
((PikaCanvasGridPrivate *) pika_canvas_grid_get_instance_private ((PikaCanvasGrid *) (grid)))
/* local function prototypes */
static void pika_canvas_grid_finalize (GObject *object);
static void pika_canvas_grid_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec);
static void pika_canvas_grid_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec);
static void pika_canvas_grid_draw (PikaCanvasItem *item,
cairo_t *cr);
static cairo_region_t * pika_canvas_grid_get_extents (PikaCanvasItem *item);
static void pika_canvas_grid_stroke (PikaCanvasItem *item,
cairo_t *cr);
G_DEFINE_TYPE_WITH_PRIVATE (PikaCanvasGrid, pika_canvas_grid,
PIKA_TYPE_CANVAS_ITEM)
#define parent_class pika_canvas_grid_parent_class
static void
pika_canvas_grid_class_init (PikaCanvasGridClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
PikaCanvasItemClass *item_class = PIKA_CANVAS_ITEM_CLASS (klass);
object_class->finalize = pika_canvas_grid_finalize;
object_class->set_property = pika_canvas_grid_set_property;
object_class->get_property = pika_canvas_grid_get_property;
item_class->draw = pika_canvas_grid_draw;
item_class->get_extents = pika_canvas_grid_get_extents;
item_class->stroke = pika_canvas_grid_stroke;
g_object_class_install_property (object_class, PROP_GRID,
g_param_spec_object ("grid", NULL, NULL,
PIKA_TYPE_GRID,
PIKA_PARAM_READWRITE));
g_object_class_install_property (object_class, PROP_GRID_STYLE,
g_param_spec_boolean ("grid-style",
NULL, NULL,
FALSE,
PIKA_PARAM_READWRITE));
}
static void
pika_canvas_grid_init (PikaCanvasGrid *grid)
{
PikaCanvasGridPrivate *private = GET_PRIVATE (grid);
private->grid = g_object_new (PIKA_TYPE_GRID, NULL);
}
static void
pika_canvas_grid_finalize (GObject *object)
{
PikaCanvasGridPrivate *private = GET_PRIVATE (object);
g_clear_object (&private->grid);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
pika_canvas_grid_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec)
{
PikaCanvasGridPrivate *private = GET_PRIVATE (object);
switch (property_id)
{
case PROP_GRID:
{
PikaGrid *grid = g_value_get_object (value);
if (grid)
pika_config_sync (G_OBJECT (grid), G_OBJECT (private->grid), 0);
}
break;
case PROP_GRID_STYLE:
private->grid_style = g_value_get_boolean (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
pika_canvas_grid_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec)
{
PikaCanvasGridPrivate *private = GET_PRIVATE (object);
switch (property_id)
{
case PROP_GRID:
g_value_set_object (value, private->grid);
break;
case PROP_GRID_STYLE:
g_value_set_boolean (value, private->grid_style);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
pika_canvas_grid_draw (PikaCanvasItem *item,
cairo_t *cr)
{
PikaCanvasGridPrivate *private = GET_PRIVATE (item);
PikaDisplayShell *shell = pika_canvas_item_get_shell (item);
gdouble xspacing, yspacing;
gdouble xoffset, yoffset;
gboolean vert, horz;
gdouble dx1, dy1, dx2, dy2;
gint x1, y1, x2, y2;
gdouble dx, dy;
gint x, y;
#define CROSSHAIR 2
pika_grid_get_spacing (private->grid, &xspacing, &yspacing);
pika_grid_get_offset (private->grid, &xoffset, &yoffset);
g_return_if_fail (xspacing >= 0.0 &&
yspacing >= 0.0);
xspacing *= shell->scale_x;
yspacing *= shell->scale_y;
xoffset *= shell->scale_x;
yoffset *= shell->scale_y;
/* skip grid drawing when the space between grid lines starts
* disappearing, see bug #599267.
*/
vert = (xspacing >= 2.0);
horz = (yspacing >= 2.0);
if (! vert && ! horz)
return;
cairo_clip_extents (cr, &dx1, &dy1, &dx2, &dy2);
x1 = floor (dx1) - 1;
y1 = floor (dy1) - 1;
x2 = ceil (dx2) + 1;
y2 = ceil (dy2) + 1;
if (! pika_display_shell_get_infinite_canvas (shell))
{
GeglRectangle bounds;
pika_display_shell_scale_get_image_unrotated_bounds (
shell,
&bounds.x, &bounds.y, &bounds.width, &bounds.height);
if (! gegl_rectangle_intersect (&bounds,
&bounds,
GEGL_RECTANGLE (x1, y1,
x2 - x1, y2 - y1)))
{
return;
}
x1 = bounds.x;
y1 = bounds.y;
x2 = bounds.x + bounds.width;
y2 = bounds.y + bounds.height;
}
switch (pika_grid_get_style (private->grid))
{
case PIKA_GRID_INTERSECTIONS:
x1 -= CROSSHAIR;
y1 -= CROSSHAIR;
x2 += CROSSHAIR;
y2 += CROSSHAIR;
break;
case PIKA_GRID_DOTS:
case PIKA_GRID_ON_OFF_DASH:
case PIKA_GRID_DOUBLE_DASH:
case PIKA_GRID_SOLID:
break;
}
xoffset = fmod (xoffset - shell->offset_x - x1, xspacing);
yoffset = fmod (yoffset - shell->offset_y - y1, yspacing);
if (xoffset < 0.0)
xoffset += xspacing;
if (yoffset < 0.0)
yoffset += yspacing;
switch (pika_grid_get_style (private->grid))
{
case PIKA_GRID_DOTS:
if (vert && horz)
{
for (dx = x1 + xoffset; dx <= x2; dx += xspacing)
{
x = RINT (dx);
for (dy = y1 + yoffset; dy <= y2; dy += yspacing)
{
y = RINT (dy);
cairo_move_to (cr, x, y + 0.5);
cairo_line_to (cr, x + 1.0, y + 0.5);
}
}
}
break;
case PIKA_GRID_INTERSECTIONS:
if (vert && horz)
{
for (dx = x1 + xoffset; dx <= x2; dx += xspacing)
{
x = RINT (dx);
for (dy = y1 + yoffset; dy <= y2; dy += yspacing)
{
y = RINT (dy);
cairo_move_to (cr, x + 0.5, y - CROSSHAIR);
cairo_line_to (cr, x + 0.5, y + CROSSHAIR + 1.0);
cairo_move_to (cr, x - CROSSHAIR, y + 0.5);
cairo_line_to (cr, x + CROSSHAIR + 1.0, y + 0.5);
}
}
}
break;
case PIKA_GRID_ON_OFF_DASH:
case PIKA_GRID_DOUBLE_DASH:
case PIKA_GRID_SOLID:
if (vert)
{
for (dx = x1 + xoffset; dx < x2; dx += xspacing)
{
x = RINT (dx);
cairo_move_to (cr, x + 0.5, y1);
cairo_line_to (cr, x + 0.5, y2);
}
}
if (horz)
{
for (dy = y1 + yoffset; dy < y2; dy += yspacing)
{
y = RINT (dy);
cairo_move_to (cr, x1, y + 0.5);
cairo_line_to (cr, x2, y + 0.5);
}
}
break;
}
_pika_canvas_item_stroke (item, cr);
}
static cairo_region_t *
pika_canvas_grid_get_extents (PikaCanvasItem *item)
{
PikaDisplayShell *shell = pika_canvas_item_get_shell (item);
PikaImage *image = pika_canvas_item_get_image (item);
cairo_rectangle_int_t rectangle;
if (! image)
return NULL;
if (! pika_display_shell_get_infinite_canvas (shell))
{
gdouble x1, y1;
gdouble x2, y2;
gint w, h;
w = pika_image_get_width (image);
h = pika_image_get_height (image);
pika_canvas_item_transform_xy_f (item, 0, 0, &x1, &y1);
pika_canvas_item_transform_xy_f (item, w, h, &x2, &y2);
rectangle.x = floor (x1);
rectangle.y = floor (y1);
rectangle.width = ceil (x2) - rectangle.x;
rectangle.height = ceil (y2) - rectangle.y;
}
else
{
pika_canvas_item_untransform_viewport (item,
&rectangle.x,
&rectangle.y,
&rectangle.width,
&rectangle.height);
}
return cairo_region_create_rectangle (&rectangle);
}
static void
pika_canvas_grid_stroke (PikaCanvasItem *item,
cairo_t *cr)
{
PikaCanvasGridPrivate *private = GET_PRIVATE (item);
if (private->grid_style)
{
PikaDisplayShell *shell = pika_canvas_item_get_shell (item);
pika_canvas_set_grid_style (pika_canvas_item_get_canvas (item), cr,
private->grid,
shell->offset_x, shell->offset_y);
cairo_stroke (cr);
}
else
{
PIKA_CANVAS_ITEM_CLASS (parent_class)->stroke (item, cr);
}
}
PikaCanvasItem *
pika_canvas_grid_new (PikaDisplayShell *shell,
PikaGrid *grid)
{
g_return_val_if_fail (PIKA_IS_DISPLAY_SHELL (shell), NULL);
g_return_val_if_fail (grid == NULL || PIKA_IS_GRID (grid), NULL);
return g_object_new (PIKA_TYPE_CANVAS_GRID,
"shell", shell,
"grid", grid,
NULL);
}