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gimp/app/display/gimpcanvasrectangleguides.c

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/* GIMP - The GNU Image Manipulation Program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* gimpcanvasrectangleguides.c
* Copyright (C) 2011 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 "libgimpbase/gimpbase.h"
#include "libgimpmath/gimpmath.h"
#include "display-types.h"
#include "gimpcanvasrectangleguides.h"
#include "gimpdisplayshell.h"
#define SQRT5 2.236067977
enum
{
PROP_0,
PROP_X,
PROP_Y,
PROP_WIDTH,
PROP_HEIGHT,
PROP_TYPE,
PROP_N_GUIDES
};
typedef struct _GimpCanvasRectangleGuidesPrivate GimpCanvasRectangleGuidesPrivate;
struct _GimpCanvasRectangleGuidesPrivate
{
gdouble x;
gdouble y;
gdouble width;
gdouble height;
GimpGuidesType type;
gint n_guides;
};
#define GET_PRIVATE(rectangle) \
((GimpCanvasRectangleGuidesPrivate *) gimp_canvas_rectangle_guides_get_instance_private ((GimpCanvasRectangleGuides *) (rectangle)))
/* local function prototypes */
static void gimp_canvas_rectangle_guides_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec);
static void gimp_canvas_rectangle_guides_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec);
static void gimp_canvas_rectangle_guides_draw (GimpCanvasItem *item,
cairo_t *cr);
static cairo_region_t * gimp_canvas_rectangle_guides_get_extents (GimpCanvasItem *item);
G_DEFINE_TYPE_WITH_PRIVATE (GimpCanvasRectangleGuides,
gimp_canvas_rectangle_guides, GIMP_TYPE_CANVAS_ITEM)
#define parent_class gimp_canvas_rectangle_guides_parent_class
static void
gimp_canvas_rectangle_guides_class_init (GimpCanvasRectangleGuidesClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GimpCanvasItemClass *item_class = GIMP_CANVAS_ITEM_CLASS (klass);
object_class->set_property = gimp_canvas_rectangle_guides_set_property;
object_class->get_property = gimp_canvas_rectangle_guides_get_property;
item_class->draw = gimp_canvas_rectangle_guides_draw;
item_class->get_extents = gimp_canvas_rectangle_guides_get_extents;
g_object_class_install_property (object_class, PROP_X,
g_param_spec_double ("x", NULL, NULL,
-GIMP_MAX_IMAGE_SIZE,
GIMP_MAX_IMAGE_SIZE, 0,
GIMP_PARAM_READWRITE));
g_object_class_install_property (object_class, PROP_Y,
g_param_spec_double ("y", NULL, NULL,
-GIMP_MAX_IMAGE_SIZE,
GIMP_MAX_IMAGE_SIZE, 0,
GIMP_PARAM_READWRITE));
g_object_class_install_property (object_class, PROP_WIDTH,
g_param_spec_double ("width", NULL, NULL,
-GIMP_MAX_IMAGE_SIZE,
GIMP_MAX_IMAGE_SIZE, 0,
GIMP_PARAM_READWRITE));
g_object_class_install_property (object_class, PROP_HEIGHT,
g_param_spec_double ("height", NULL, NULL,
-GIMP_MAX_IMAGE_SIZE,
GIMP_MAX_IMAGE_SIZE, 0,
GIMP_PARAM_READWRITE));
g_object_class_install_property (object_class, PROP_TYPE,
g_param_spec_enum ("type", NULL, NULL,
GIMP_TYPE_GUIDES_TYPE,
GIMP_GUIDES_NONE,
GIMP_PARAM_READWRITE));
g_object_class_install_property (object_class, PROP_N_GUIDES,
g_param_spec_int ("n-guides", NULL, NULL,
1, 128, 4,
GIMP_PARAM_READWRITE));
}
static void
gimp_canvas_rectangle_guides_init (GimpCanvasRectangleGuides *rectangle)
{
}
static void
gimp_canvas_rectangle_guides_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec)
{
GimpCanvasRectangleGuidesPrivate *private = GET_PRIVATE (object);
switch (property_id)
{
case PROP_X:
private->x = g_value_get_double (value);
break;
case PROP_Y:
private->y = g_value_get_double (value);
break;
case PROP_WIDTH:
private->width = g_value_get_double (value);
break;
case PROP_HEIGHT:
private->height = g_value_get_double (value);
break;
case PROP_TYPE:
private->type = g_value_get_enum (value);
break;
case PROP_N_GUIDES:
private->n_guides = g_value_get_int (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
gimp_canvas_rectangle_guides_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec)
{
GimpCanvasRectangleGuidesPrivate *private = GET_PRIVATE (object);
switch (property_id)
{
case PROP_X:
g_value_set_double (value, private->x);
break;
case PROP_Y:
g_value_set_double (value, private->y);
break;
case PROP_WIDTH:
g_value_set_double (value, private->width);
break;
case PROP_HEIGHT:
g_value_set_double (value, private->height);
break;
case PROP_TYPE:
g_value_set_enum (value, private->type);
break;
case PROP_N_GUIDES:
g_value_set_int (value, private->n_guides);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
gimp_canvas_rectangle_guides_transform (GimpCanvasItem *item,
gdouble *x1,
gdouble *y1,
gdouble *x2,
gdouble *y2)
{
GimpCanvasRectangleGuidesPrivate *private = GET_PRIVATE (item);
gimp_canvas_item_transform_xy_f (item,
MIN (private->x,
private->x + private->width),
MIN (private->y,
private->y + private->height),
x1, y1);
gimp_canvas_item_transform_xy_f (item,
MAX (private->x,
private->x + private->width),
MAX (private->y,
private->y + private->height),
x2, y2);
*x1 = floor (*x1) + 0.5;
*y1 = floor (*y1) + 0.5;
*x2 = ceil (*x2) - 0.5;
*y2 = ceil (*y2) - 0.5;
*x2 = MAX (*x1, *x2);
*y2 = MAX (*y1, *y2);
}
static void
draw_hline (cairo_t *cr,
gdouble x1,
gdouble x2,
gdouble y)
{
y = floor (y) + 0.5;
cairo_move_to (cr, x1, y);
cairo_line_to (cr, x2, y);
}
static void
draw_vline (cairo_t *cr,
gdouble y1,
gdouble y2,
gdouble x)
{
x = floor (x) + 0.5;
cairo_move_to (cr, x, y1);
cairo_line_to (cr, x, y2);
}
static void
gimp_canvas_rectangle_guides_draw (GimpCanvasItem *item,
cairo_t *cr)
{
GimpCanvasRectangleGuidesPrivate *private = GET_PRIVATE (item);
gdouble x1, y1;
gdouble x2, y2;
gint i;
gimp_canvas_rectangle_guides_transform (item, &x1, &y1, &x2, &y2);
switch (private->type)
{
case GIMP_GUIDES_NONE:
break;
case GIMP_GUIDES_CENTER_LINES:
draw_hline (cr, x1, x2, (y1 + y2) / 2);
draw_vline (cr, y1, y2, (x1 + x2) / 2);
break;
case GIMP_GUIDES_THIRDS:
draw_hline (cr, x1, x2, (2 * y1 + y2) / 3);
draw_hline (cr, x1, x2, ( y1 + 2 * y2) / 3);
draw_vline (cr, y1, y2, (2 * x1 + x2) / 3);
draw_vline (cr, y1, y2, ( x1 + 2 * x2) / 3);
break;
case GIMP_GUIDES_FIFTHS:
for (i = 0; i < 5; i++)
{
draw_hline (cr, x1, x2, y1 + i * (y2 - y1) / 5);
draw_vline (cr, y1, y2, x1 + i * (x2 - x1) / 5);
}
break;
case GIMP_GUIDES_GOLDEN:
draw_hline (cr, x1, x2, (2 * y1 + (1 + SQRT5) * y2) / (3 + SQRT5));
draw_hline (cr, x1, x2, ((1 + SQRT5) * y1 + 2 * y2) / (3 + SQRT5));
draw_vline (cr, y1, y2, (2 * x1 + (1 + SQRT5) * x2) / (3 + SQRT5));
draw_vline (cr, y1, y2, ((1 + SQRT5) * x1 + 2 * x2) / (3 + SQRT5));
break;
/* This code implements the method of diagonals discovered by
* Edwin Westhoff - see http://www.diagonalmethod.info/
*/
case GIMP_GUIDES_DIAGONALS:
{
/* the side of the largest square that can be
* fitted in whole into the rectangle (x1, y1), (x2, y2)
*/
const gdouble square_side = MIN (x2 - x1, y2 - y1);
/* diagonal from the top-left edge */
cairo_move_to (cr, x1, y1);
cairo_line_to (cr, x1 + square_side, y1 + square_side);
/* diagonal from the top-right edge */
cairo_move_to (cr, x2, y1);
cairo_line_to (cr, x2 - square_side, y1 + square_side);
/* diagonal from the bottom-left edge */
cairo_move_to (cr, x1, y2);
cairo_line_to (cr, x1 + square_side, y2 - square_side);
/* diagonal from the bottom-right edge */
cairo_move_to (cr, x2, y2);
cairo_line_to (cr, x2 - square_side, y2 - square_side);
}
break;
case GIMP_GUIDES_N_LINES:
for (i = 0; i < private->n_guides; i++)
{
draw_hline (cr, x1, x2, y1 + i * (y2 - y1) / private->n_guides);
draw_vline (cr, y1, y2, x1 + i * (x2 - x1) / private->n_guides);
}
break;
case GIMP_GUIDES_SPACING:
break;
}
_gimp_canvas_item_stroke (item, cr);
}
static cairo_region_t *
gimp_canvas_rectangle_guides_get_extents (GimpCanvasItem *item)
{
GimpCanvasRectangleGuidesPrivate *private = GET_PRIVATE (item);
if (private->type != GIMP_GUIDES_NONE)
{
cairo_rectangle_int_t rectangle;
gdouble x1, y1;
gdouble x2, y2;
gimp_canvas_rectangle_guides_transform (item, &x1, &y1, &x2, &y2);
rectangle.x = floor (x1 - 1.5);
rectangle.y = floor (y1 - 1.5);
rectangle.width = ceil (x2 - x1 + 3.0);
rectangle.height = ceil (y2 - y1 + 3.0);
return cairo_region_create_rectangle (&rectangle);
}
return NULL;
}
GimpCanvasItem *
gimp_canvas_rectangle_guides_new (GimpDisplayShell *shell,
gdouble x,
gdouble y,
gdouble width,
gdouble height,
GimpGuidesType type,
gint n_guides)
{
g_return_val_if_fail (GIMP_IS_DISPLAY_SHELL (shell), NULL);
return g_object_new (GIMP_TYPE_CANVAS_RECTANGLE_GUIDES,
"shell", shell,
"x", x,
"y", y,
"width", width,
"height", height,
"type", type,
"n-guides", n_guides,
NULL);
}
void
gimp_canvas_rectangle_guides_set (GimpCanvasItem *rectangle,
gdouble x,
gdouble y,
gdouble width,
gdouble height,
GimpGuidesType type,
gint n_guides)
{
g_return_if_fail (GIMP_IS_CANVAS_RECTANGLE_GUIDES (rectangle));
gimp_canvas_item_begin_change (rectangle);
g_object_set (rectangle,
"x", x,
"y", y,
"width", width,
"height", height,
"type", type,
"n-guides", n_guides,
NULL);
gimp_canvas_item_end_change (rectangle);
}
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