mirror of
https://gitlab.gnome.org/GNOME/gimp
synced 2024-10-20 19:43:01 +00:00
601 lines
21 KiB
C
601 lines
21 KiB
C
/* GIMP - The GNU Image Manipulation Program
|
|
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
|
|
*
|
|
* gimpcanvastransformguides.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 <http://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 "core/gimp-transform-utils.h"
|
|
|
|
#include "gimpcanvastransformguides.h"
|
|
#include "gimpdisplayshell.h"
|
|
#include "gimpdisplayshell-transform.h"
|
|
#include "core/gimp-utils.h"
|
|
|
|
|
|
#define SQRT5 2.236067977
|
|
|
|
|
|
enum
|
|
{
|
|
PROP_0,
|
|
PROP_TRANSFORM,
|
|
PROP_X1,
|
|
PROP_Y1,
|
|
PROP_X2,
|
|
PROP_Y2,
|
|
PROP_TYPE,
|
|
PROP_N_GUIDES
|
|
};
|
|
|
|
|
|
typedef struct _GimpCanvasTransformGuidesPrivate GimpCanvasTransformGuidesPrivate;
|
|
|
|
struct _GimpCanvasTransformGuidesPrivate
|
|
{
|
|
GimpMatrix3 transform;
|
|
gdouble x1, y1;
|
|
gdouble x2, y2;
|
|
GimpGuidesType type;
|
|
gint n_guides;
|
|
};
|
|
|
|
#define GET_PRIVATE(transform) \
|
|
G_TYPE_INSTANCE_GET_PRIVATE (transform, \
|
|
GIMP_TYPE_CANVAS_TRANSFORM_GUIDES, \
|
|
GimpCanvasTransformGuidesPrivate)
|
|
|
|
|
|
/* local function prototypes */
|
|
|
|
static void gimp_canvas_transform_guides_set_property (GObject *object,
|
|
guint property_id,
|
|
const GValue *value,
|
|
GParamSpec *pspec);
|
|
static void gimp_canvas_transform_guides_get_property (GObject *object,
|
|
guint property_id,
|
|
GValue *value,
|
|
GParamSpec *pspec);
|
|
static void gimp_canvas_transform_guides_draw (GimpCanvasItem *item,
|
|
GimpDisplayShell *shell,
|
|
cairo_t *cr);
|
|
static cairo_region_t * gimp_canvas_transform_guides_get_extents (GimpCanvasItem *item,
|
|
GimpDisplayShell *shell);
|
|
|
|
|
|
G_DEFINE_TYPE (GimpCanvasTransformGuides, gimp_canvas_transform_guides,
|
|
GIMP_TYPE_CANVAS_ITEM)
|
|
|
|
#define parent_class gimp_canvas_transform_guides_parent_class
|
|
|
|
|
|
static void
|
|
gimp_canvas_transform_guides_class_init (GimpCanvasTransformGuidesClass *klass)
|
|
{
|
|
GObjectClass *object_class = G_OBJECT_CLASS (klass);
|
|
GimpCanvasItemClass *item_class = GIMP_CANVAS_ITEM_CLASS (klass);
|
|
|
|
object_class->set_property = gimp_canvas_transform_guides_set_property;
|
|
object_class->get_property = gimp_canvas_transform_guides_get_property;
|
|
|
|
item_class->draw = gimp_canvas_transform_guides_draw;
|
|
item_class->get_extents = gimp_canvas_transform_guides_get_extents;
|
|
|
|
g_object_class_install_property (object_class, PROP_TRANSFORM,
|
|
gimp_param_spec_matrix3 ("transform",
|
|
NULL, NULL,
|
|
NULL,
|
|
GIMP_PARAM_READWRITE));
|
|
|
|
g_object_class_install_property (object_class, PROP_X1,
|
|
g_param_spec_double ("x1",
|
|
NULL, NULL,
|
|
-GIMP_MAX_IMAGE_SIZE,
|
|
GIMP_MAX_IMAGE_SIZE,
|
|
0.0,
|
|
GIMP_PARAM_READWRITE));
|
|
|
|
g_object_class_install_property (object_class, PROP_Y1,
|
|
g_param_spec_double ("y1",
|
|
NULL, NULL,
|
|
-GIMP_MAX_IMAGE_SIZE,
|
|
GIMP_MAX_IMAGE_SIZE,
|
|
0.0,
|
|
GIMP_PARAM_READWRITE));
|
|
|
|
g_object_class_install_property (object_class, PROP_X2,
|
|
g_param_spec_double ("x2",
|
|
NULL, NULL,
|
|
-GIMP_MAX_IMAGE_SIZE,
|
|
GIMP_MAX_IMAGE_SIZE,
|
|
0.0,
|
|
GIMP_PARAM_READWRITE));
|
|
|
|
g_object_class_install_property (object_class, PROP_Y2,
|
|
g_param_spec_double ("y2",
|
|
NULL, NULL,
|
|
-GIMP_MAX_IMAGE_SIZE,
|
|
GIMP_MAX_IMAGE_SIZE,
|
|
0.0,
|
|
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));
|
|
|
|
g_type_class_add_private (klass, sizeof (GimpCanvasTransformGuidesPrivate));
|
|
}
|
|
|
|
static void
|
|
gimp_canvas_transform_guides_init (GimpCanvasTransformGuides *transform)
|
|
{
|
|
}
|
|
|
|
static void
|
|
gimp_canvas_transform_guides_set_property (GObject *object,
|
|
guint property_id,
|
|
const GValue *value,
|
|
GParamSpec *pspec)
|
|
{
|
|
GimpCanvasTransformGuidesPrivate *private = GET_PRIVATE (object);
|
|
|
|
switch (property_id)
|
|
{
|
|
case PROP_TRANSFORM:
|
|
{
|
|
GimpMatrix3 *transform = g_value_get_boxed (value);
|
|
|
|
if (transform)
|
|
private->transform = *transform;
|
|
else
|
|
gimp_matrix3_identity (&private->transform);
|
|
}
|
|
break;
|
|
|
|
case PROP_X1:
|
|
private->x1 = g_value_get_double (value);
|
|
break;
|
|
|
|
case PROP_Y1:
|
|
private->y1 = g_value_get_double (value);
|
|
break;
|
|
|
|
case PROP_X2:
|
|
private->x2 = g_value_get_double (value);
|
|
break;
|
|
|
|
case PROP_Y2:
|
|
private->y2 = 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_transform_guides_get_property (GObject *object,
|
|
guint property_id,
|
|
GValue *value,
|
|
GParamSpec *pspec)
|
|
{
|
|
GimpCanvasTransformGuidesPrivate *private = GET_PRIVATE (object);
|
|
|
|
switch (property_id)
|
|
{
|
|
case PROP_TRANSFORM:
|
|
g_value_set_boxed (value, &private->transform);
|
|
break;
|
|
|
|
case PROP_X1:
|
|
g_value_set_double (value, private->x1);
|
|
break;
|
|
|
|
case PROP_Y1:
|
|
g_value_set_double (value, private->y1);
|
|
break;
|
|
|
|
case PROP_X2:
|
|
g_value_set_double (value, private->x2);
|
|
break;
|
|
|
|
case PROP_Y2:
|
|
g_value_set_double (value, private->y2);
|
|
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 gboolean
|
|
gimp_canvas_transform_guides_transform (GimpCanvasItem *item,
|
|
GimpDisplayShell *shell,
|
|
gdouble *tx1,
|
|
gdouble *ty1,
|
|
gdouble *tx2,
|
|
gdouble *ty2,
|
|
gdouble *tx3,
|
|
gdouble *ty3,
|
|
gdouble *tx4,
|
|
gdouble *ty4)
|
|
{
|
|
GimpCanvasTransformGuidesPrivate *private = GET_PRIVATE (item);
|
|
|
|
gimp_matrix3_transform_point (&private->transform,
|
|
private->x1, private->y1,
|
|
tx1, ty1);
|
|
gimp_matrix3_transform_point (&private->transform,
|
|
private->x2, private->y1,
|
|
tx2, ty2);
|
|
gimp_matrix3_transform_point (&private->transform,
|
|
private->x1, private->y2,
|
|
tx3, ty3);
|
|
gimp_matrix3_transform_point (&private->transform,
|
|
private->x2, private->y2,
|
|
tx4, ty4);
|
|
|
|
return gimp_transform_polygon_is_convex (*tx1, *ty1,
|
|
*tx2, *ty2,
|
|
*tx3, *ty3,
|
|
*tx4, *ty4);
|
|
}
|
|
|
|
static void
|
|
draw_line (cairo_t *cr,
|
|
GimpDisplayShell *shell,
|
|
GimpMatrix3 *transform,
|
|
gdouble x1,
|
|
gdouble y1,
|
|
gdouble x2,
|
|
gdouble y2)
|
|
{
|
|
gimp_matrix3_transform_point (transform, x1, y1, &x1, &y1);
|
|
gimp_matrix3_transform_point (transform, x2, y2, &x2, &y2);
|
|
|
|
gimp_display_shell_transform_xy_f (shell, x1, y1, &x1, &y1);
|
|
gimp_display_shell_transform_xy_f (shell, x2, y2, &x2, &y2);
|
|
|
|
x1 = floor (x1) + 0.5;
|
|
y1 = floor (y1) + 0.5;
|
|
x2 = floor (x2) + 0.5;
|
|
y2 = floor (y2) + 0.5;
|
|
|
|
cairo_move_to (cr, x1, y1);
|
|
cairo_line_to (cr, x2, y2);
|
|
}
|
|
|
|
static void
|
|
draw_hline (cairo_t *cr,
|
|
GimpDisplayShell *shell,
|
|
GimpMatrix3 *transform,
|
|
gdouble x1,
|
|
gdouble x2,
|
|
gdouble y)
|
|
{
|
|
draw_line (cr, shell, transform, x1, y, x2, y);
|
|
}
|
|
|
|
static void
|
|
draw_vline (cairo_t *cr,
|
|
GimpDisplayShell *shell,
|
|
GimpMatrix3 *transform,
|
|
gdouble y1,
|
|
gdouble y2,
|
|
gdouble x)
|
|
{
|
|
draw_line (cr, shell, transform, x, y1, x, y2);
|
|
}
|
|
|
|
static void
|
|
gimp_canvas_transform_guides_draw (GimpCanvasItem *item,
|
|
GimpDisplayShell *shell,
|
|
cairo_t *cr)
|
|
{
|
|
GimpCanvasTransformGuidesPrivate *private = GET_PRIVATE (item);
|
|
gdouble x1, y1;
|
|
gdouble x2, y2;
|
|
gdouble x3, y3;
|
|
gdouble x4, y4;
|
|
gboolean convex;
|
|
gint i;
|
|
|
|
convex = gimp_canvas_transform_guides_transform (item, shell,
|
|
&x1, &y1,
|
|
&x2, &y2,
|
|
&x3, &y3,
|
|
&x4, &y4);
|
|
|
|
gimp_display_shell_transform_xy_f (shell, x1, y1, &x1, &y1);
|
|
gimp_display_shell_transform_xy_f (shell, x2, y2, &x2, &y2);
|
|
gimp_display_shell_transform_xy_f (shell, x3, y3, &x3, &y3);
|
|
gimp_display_shell_transform_xy_f (shell, x4, y4, &x4, &y4);
|
|
|
|
x1 = floor (x1) + 0.5;
|
|
y1 = floor (y1) + 0.5;
|
|
x2 = floor (x2) + 0.5;
|
|
y2 = floor (y2) + 0.5;
|
|
x3 = floor (x3) + 0.5;
|
|
y3 = floor (y3) + 0.5;
|
|
x4 = floor (x4) + 0.5;
|
|
y4 = floor (y4) + 0.5;
|
|
|
|
cairo_move_to (cr, x1, y1);
|
|
cairo_line_to (cr, x2, y2);
|
|
cairo_line_to (cr, x4, y4);
|
|
cairo_line_to (cr, x3, y3);
|
|
cairo_line_to (cr, x1, y1);
|
|
|
|
if (! convex)
|
|
{
|
|
_gimp_canvas_item_stroke (item, cr);
|
|
return;
|
|
}
|
|
|
|
switch (private->type)
|
|
{
|
|
case GIMP_GUIDES_NONE:
|
|
break;
|
|
|
|
case GIMP_GUIDES_CENTER_LINES:
|
|
draw_hline (cr, shell, &private->transform,
|
|
private->x1, private->x2, (private->y1 + private->y2) / 2);
|
|
draw_vline (cr, shell, &private->transform,
|
|
private->y1, private->y2, (private->x1 + private->x2) / 2);
|
|
break;
|
|
|
|
case GIMP_GUIDES_THIRDS:
|
|
draw_hline (cr, shell, &private->transform,
|
|
private->x1, private->x2, (2 * private->y1 + private->y2) / 3);
|
|
draw_hline (cr, shell, &private->transform,
|
|
private->x1, private->x2, (private->y1 + 2 * private->y2) / 3);
|
|
|
|
draw_vline (cr, shell, &private->transform,
|
|
private->y1, private->y2, (2 * private->x1 + private->x2) / 3);
|
|
draw_vline (cr, shell, &private->transform,
|
|
private->y1, private->y2, (private->x1 + 2 * private->x2) / 3);
|
|
break;
|
|
|
|
case GIMP_GUIDES_FIFTHS:
|
|
for (i = 0; i < 5; i++)
|
|
{
|
|
draw_hline (cr, shell, &private->transform,
|
|
private->x1, private->x2,
|
|
private->y1 + i * (private->y2 - private->y1) / 5);
|
|
draw_vline (cr, shell, &private->transform,
|
|
private->y1, private->y2,
|
|
private->x1 + i * (private->x2 - private->x1) / 5);
|
|
}
|
|
break;
|
|
|
|
case GIMP_GUIDES_GOLDEN:
|
|
draw_hline (cr, shell, &private->transform,
|
|
private->x1, private->x2,
|
|
(2 * private->y1 + (1 + SQRT5) * private->y2) / (3 + SQRT5));
|
|
draw_hline (cr, shell, &private->transform,
|
|
private->x1, private->x2,
|
|
((1 + SQRT5) * private->y1 + 2 * private->y2) / (3 + SQRT5));
|
|
|
|
draw_vline (cr, shell, &private->transform,
|
|
private->y1, private->y2,
|
|
(2 * private->x1 + (1 + SQRT5) * private->x2) / (3 + SQRT5));
|
|
draw_vline (cr, shell, &private->transform,
|
|
private->y1, private->y2,
|
|
((1 + SQRT5) * private->x1 + 2 * private->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 (private->x2 - private->x1,
|
|
private->y2 - private->y1);
|
|
|
|
/* diagonal from the top-left edge */
|
|
draw_line (cr, shell, &private->transform,
|
|
private->x1, private->y1,
|
|
private->x1 + square_side,
|
|
private->y1 + square_side);
|
|
|
|
/* diagonal from the top-right edge */
|
|
draw_line (cr, shell, &private->transform,
|
|
private->x2, private->y1,
|
|
private->x2 - square_side,
|
|
private->y1 + square_side);
|
|
|
|
/* diagonal from the bottom-left edge */
|
|
draw_line (cr, shell, &private->transform,
|
|
private->x1, private->y2,
|
|
private->x1 + square_side,
|
|
private->y2 - square_side);
|
|
|
|
/* diagonal from the bottom-right edge */
|
|
draw_line (cr, shell, &private->transform,
|
|
private->x2, private->y2,
|
|
private->x2 - square_side,
|
|
private->y2 - square_side);
|
|
}
|
|
break;
|
|
|
|
case GIMP_GUIDES_N_LINES:
|
|
case GIMP_GUIDES_SPACING:
|
|
{
|
|
gint width, height;
|
|
gint ngx, ngy;
|
|
|
|
width = MAX (1, private->x2 - private->x1);
|
|
height = MAX (1, private->y2 - private->y1);
|
|
|
|
if (private->type == GIMP_GUIDES_N_LINES)
|
|
{
|
|
if (width <= height)
|
|
{
|
|
ngx = private->n_guides;
|
|
ngy = ngx * MAX (1, height / width);
|
|
}
|
|
else
|
|
{
|
|
ngy = private->n_guides;
|
|
ngx = ngy * MAX (1, width / height);
|
|
}
|
|
}
|
|
else /* GIMP_GUIDES_SPACING */
|
|
{
|
|
gint grid_size = MAX (2, private->n_guides);
|
|
|
|
ngx = width / grid_size;
|
|
ngy = height / grid_size;
|
|
}
|
|
|
|
for (i = 1; i <= ngx; i++)
|
|
{
|
|
gdouble x = private->x1 + (((gdouble) i) / (ngx + 1) *
|
|
(private->x2 - private->x1));
|
|
|
|
draw_line (cr, shell, &private->transform,
|
|
x, private->y1,
|
|
x, private->y2);
|
|
}
|
|
|
|
for (i = 1; i <= ngy; i++)
|
|
{
|
|
gdouble y = private->y1 + (((gdouble) i) / (ngy + 1) *
|
|
(private->y2 - private->y1));
|
|
|
|
draw_line (cr, shell, &private->transform,
|
|
private->x1, y,
|
|
private->x2, y);
|
|
}
|
|
}
|
|
}
|
|
|
|
_gimp_canvas_item_stroke (item, cr);
|
|
}
|
|
|
|
static cairo_region_t *
|
|
gimp_canvas_transform_guides_get_extents (GimpCanvasItem *item,
|
|
GimpDisplayShell *shell)
|
|
{
|
|
gdouble x1, y1;
|
|
gdouble x2, y2;
|
|
gdouble x3, y3;
|
|
gdouble x4, y4;
|
|
cairo_rectangle_int_t extents;
|
|
|
|
gimp_canvas_transform_guides_transform (item, shell,
|
|
&x1, &y1,
|
|
&x2, &y2,
|
|
&x3, &y3,
|
|
&x4, &y4);
|
|
|
|
gimp_display_shell_transform_xy_f (shell, x1, y1, &x1, &y1);
|
|
gimp_display_shell_transform_xy_f (shell, x2, y2, &x2, &y2);
|
|
gimp_display_shell_transform_xy_f (shell, x3, y3, &x3, &y3);
|
|
gimp_display_shell_transform_xy_f (shell, x4, y4, &x4, &y4);
|
|
|
|
extents.x = (gint) floor (MIN4 (x1, x2, x3, x4) - 1.5);
|
|
extents.y = (gint) floor (MIN4 (y1, y2, y3, y4) - 1.5);
|
|
extents.width = (gint) ceil (MAX4 (x1, x2, x3, x4) + 1.5);
|
|
extents.height = (gint) ceil (MAX4 (y1, y2, y3, y4) + 1.5);
|
|
|
|
extents.width -= extents.x;
|
|
extents.height -= extents.y;
|
|
|
|
return cairo_region_create_rectangle (&extents);
|
|
}
|
|
|
|
GimpCanvasItem *
|
|
gimp_canvas_transform_guides_new (GimpDisplayShell *shell,
|
|
const GimpMatrix3 *transform,
|
|
gdouble x1,
|
|
gdouble y1,
|
|
gdouble x2,
|
|
gdouble y2,
|
|
GimpGuidesType type,
|
|
gint n_guides)
|
|
{
|
|
g_return_val_if_fail (GIMP_IS_DISPLAY_SHELL (shell), NULL);
|
|
|
|
return g_object_new (GIMP_TYPE_CANVAS_TRANSFORM_GUIDES,
|
|
"shell", shell,
|
|
"transform", transform,
|
|
"x1", x1,
|
|
"y1", y1,
|
|
"x2", x2,
|
|
"y2", y2,
|
|
"type", type,
|
|
"n-guides", n_guides,
|
|
NULL);
|
|
}
|
|
|
|
void
|
|
gimp_canvas_transform_guides_set (GimpCanvasItem *guides,
|
|
const GimpMatrix3 *transform,
|
|
GimpGuidesType type,
|
|
gint n_guides)
|
|
{
|
|
g_return_if_fail (GIMP_IS_CANVAS_TRANSFORM_GUIDES (guides));
|
|
|
|
gimp_canvas_item_begin_change (guides);
|
|
|
|
g_object_set (guides,
|
|
"transform", transform,
|
|
"type", type,
|
|
"n-guides", n_guides,
|
|
NULL);
|
|
|
|
gimp_canvas_item_end_change (guides);
|
|
}
|