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Gimp/app/widgets/gimpgrideditor.c
Ell 1572bccc9f app: add support for subpixel image grids 
In particular, this enables grids whose points of intersection
are at the middle of the image's pixels, which is useful for
undistorted painting with odd-sized brushes using tools other than
the pencil.

This commit also changes the grid visibility behavior, so that the
the visibiltiy of horizontal and vertical grid lines (depending on
the zoom level) is independent.
2017-02-19 18:13:41 -05:00

343 lines
12 KiB
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/* GIMP - The GNU Image Manipulation Program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* GimpGridEditor
* Copyright (C) 2003 Henrik Brix Andersen <brix@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 "libgimpwidgets/gimpwidgets.h"
#include "widgets-types.h"
#include "core/gimpcontext.h"
#include "core/gimpgrid.h"
#include "core/gimpmarshal.h"
#include "gimpcolorpanel.h"
#include "gimpgrideditor.h"
#include "gimppropwidgets.h"
#include "gimp-intl.h"
#define GRID_EDITOR_DEFAULT_RESOLUTION 72.0
#define GRID_EDITOR_COLOR_BUTTON_WIDTH 60
#define GRID_EDITOR_COLOR_BUTTON_HEIGHT 24
enum
{
PROP_0,
PROP_GRID,
PROP_CONTEXT,
PROP_XRESOLUTION,
PROP_YRESOLUTION
};
static void gimp_grid_editor_constructed (GObject *object);
static void gimp_grid_editor_finalize (GObject *object);
static void gimp_grid_editor_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec);
static void gimp_grid_editor_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec);
G_DEFINE_TYPE (GimpGridEditor, gimp_grid_editor, GTK_TYPE_BOX)
#define parent_class gimp_grid_editor_parent_class
static void
gimp_grid_editor_class_init (GimpGridEditorClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
object_class->constructed = gimp_grid_editor_constructed;
object_class->set_property = gimp_grid_editor_set_property;
object_class->get_property = gimp_grid_editor_get_property;
object_class->finalize = gimp_grid_editor_finalize;
g_object_class_install_property (object_class, PROP_GRID,
g_param_spec_object ("grid", NULL, NULL,
GIMP_TYPE_GRID,
GIMP_PARAM_READWRITE |
G_PARAM_CONSTRUCT_ONLY));
g_object_class_install_property (object_class, PROP_CONTEXT,
g_param_spec_object ("context", NULL, NULL,
GIMP_TYPE_CONTEXT,
GIMP_PARAM_READWRITE |
G_PARAM_CONSTRUCT_ONLY));
g_object_class_install_property (object_class, PROP_XRESOLUTION,
g_param_spec_double ("xresolution", NULL, NULL,
GIMP_MIN_RESOLUTION,
GIMP_MAX_RESOLUTION,
GRID_EDITOR_DEFAULT_RESOLUTION,
GIMP_PARAM_READWRITE |
G_PARAM_CONSTRUCT_ONLY));
g_object_class_install_property (object_class, PROP_YRESOLUTION,
g_param_spec_double ("yresolution", NULL, NULL,
GIMP_MIN_RESOLUTION,
GIMP_MAX_RESOLUTION,
GRID_EDITOR_DEFAULT_RESOLUTION,
GIMP_PARAM_READWRITE |
G_PARAM_CONSTRUCT_ONLY));
}
static void
gimp_grid_editor_init (GimpGridEditor *editor)
{
gtk_orientable_set_orientation (GTK_ORIENTABLE (editor),
GTK_ORIENTATION_VERTICAL);
gtk_box_set_spacing (GTK_BOX (editor), 12);
}
static void
gimp_grid_editor_constructed (GObject *object)
{
GimpGridEditor *editor = GIMP_GRID_EDITOR (object);
GtkWidget *frame;
GtkWidget *hbox;
GtkWidget *table;
GtkWidget *style;
GtkWidget *color_button;
GtkWidget *sizeentry;
G_OBJECT_CLASS (parent_class)->constructed (object);
g_assert (editor->grid != NULL);
frame = gimp_frame_new (_("Appearance"));
gtk_box_pack_start (GTK_BOX (editor), frame, FALSE, FALSE, 0);
gtk_widget_show (frame);
table = gtk_table_new (3, 2, FALSE);
gtk_table_set_row_spacings (GTK_TABLE (table), 6);
gtk_table_set_col_spacings (GTK_TABLE (table), 6);
gtk_container_add (GTK_CONTAINER (frame), table);
style = gimp_prop_enum_combo_box_new (G_OBJECT (editor->grid), "style",
GIMP_GRID_DOTS,
GIMP_GRID_SOLID);
gimp_table_attach_aligned (GTK_TABLE (table), 0, 0,
_("Line _style:"), 0.0, 0.5,
style, 1, FALSE);
color_button = gimp_prop_color_button_new (G_OBJECT (editor->grid), "fgcolor",
_("Change grid foreground color"),
GRID_EDITOR_COLOR_BUTTON_WIDTH,
GRID_EDITOR_COLOR_BUTTON_HEIGHT,
GIMP_COLOR_AREA_FLAT);
gimp_color_panel_set_context (GIMP_COLOR_PANEL (color_button),
editor->context);
gimp_table_attach_aligned (GTK_TABLE (table), 0, 1,
_("_Foreground color:"), 0.0, 0.5,
color_button, 1, TRUE);
color_button = gimp_prop_color_button_new (G_OBJECT (editor->grid), "bgcolor",
_("Change grid background color"),
GRID_EDITOR_COLOR_BUTTON_WIDTH,
GRID_EDITOR_COLOR_BUTTON_HEIGHT,
GIMP_COLOR_AREA_FLAT);
gimp_color_panel_set_context (GIMP_COLOR_PANEL (color_button),
editor->context);
gimp_table_attach_aligned (GTK_TABLE (table), 0, 2,
_("_Background color:"), 0.0, 0.5,
color_button, 1, TRUE);
gtk_widget_show (table);
frame = gimp_frame_new (_("Spacing"));
gtk_box_pack_start (GTK_BOX (editor), frame, FALSE, FALSE, 0);
gtk_widget_show (frame);
hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 6);
gtk_container_add (GTK_CONTAINER (frame), hbox);
sizeentry = gimp_prop_coordinates_new (G_OBJECT (editor->grid),
"xspacing",
"yspacing",
"spacing-unit",
"%a",
GIMP_SIZE_ENTRY_UPDATE_SIZE,
editor->xresolution,
editor->yresolution,
TRUE);
gtk_table_set_col_spacings (GTK_TABLE (sizeentry), 2);
gtk_table_set_row_spacings (GTK_TABLE (sizeentry), 2);
gimp_size_entry_attach_label (GIMP_SIZE_ENTRY (sizeentry),
_("Horizontal"), 0, 1, 0.0);
gimp_size_entry_attach_label (GIMP_SIZE_ENTRY (sizeentry),
_("Vertical"), 0, 2, 0.0);
gimp_size_entry_attach_label (GIMP_SIZE_ENTRY (sizeentry),
_("Pixels"), 1, 4, 0.0);
gimp_size_entry_set_refval_digits (GIMP_SIZE_ENTRY (sizeentry), 0, 2);
gimp_size_entry_set_refval_digits (GIMP_SIZE_ENTRY (sizeentry), 1, 2);
gtk_box_pack_start (GTK_BOX (hbox), sizeentry, FALSE, FALSE, 0);
gtk_widget_show (sizeentry);
gtk_widget_show (hbox);
frame = gimp_frame_new (_("Offset"));
gtk_box_pack_start (GTK_BOX (editor), frame, FALSE, FALSE, 0);
gtk_widget_show (frame);
hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 6);
gtk_container_add (GTK_CONTAINER (frame), hbox);
sizeentry = gimp_prop_coordinates_new (G_OBJECT (editor->grid),
"xoffset",
"yoffset",
"offset-unit",
"%a",
GIMP_SIZE_ENTRY_UPDATE_SIZE,
editor->xresolution,
editor->yresolution,
TRUE);
gtk_table_set_col_spacings (GTK_TABLE (sizeentry), 2);
gtk_table_set_row_spacings (GTK_TABLE (sizeentry), 2);
gimp_size_entry_attach_label (GIMP_SIZE_ENTRY (sizeentry),
_("Horizontal"), 0, 1, 0.0);
gimp_size_entry_attach_label (GIMP_SIZE_ENTRY (sizeentry),
_("Vertical"), 0, 2, 0.0);
gimp_size_entry_attach_label (GIMP_SIZE_ENTRY (sizeentry),
_("Pixels"), 1, 4, 0.0);
gimp_size_entry_set_refval_digits (GIMP_SIZE_ENTRY (sizeentry), 0, 2);
gimp_size_entry_set_refval_digits (GIMP_SIZE_ENTRY (sizeentry), 1, 2);
gtk_box_pack_start (GTK_BOX (hbox), sizeentry, FALSE, FALSE, 0);
gtk_widget_show (sizeentry);
gtk_widget_show (hbox);
}
static void
gimp_grid_editor_finalize (GObject *object)
{
GimpGridEditor *editor = GIMP_GRID_EDITOR (object);
if (editor->grid)
{
g_object_unref (editor->grid);
editor->grid = NULL;
}
if (editor->context)
{
g_object_unref (editor->context);
editor->context = NULL;
}
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
gimp_grid_editor_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec)
{
GimpGridEditor *editor = GIMP_GRID_EDITOR (object);
switch (property_id)
{
case PROP_GRID:
editor->grid = g_value_dup_object (value);
break;
case PROP_CONTEXT:
editor->context = g_value_dup_object (value);
break;
case PROP_XRESOLUTION:
editor->xresolution = g_value_get_double (value);
break;
case PROP_YRESOLUTION:
editor->yresolution = g_value_get_double (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
gimp_grid_editor_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec)
{
GimpGridEditor *editor = GIMP_GRID_EDITOR (object);
switch (property_id)
{
case PROP_GRID:
g_value_set_object (value, editor->grid);
break;
case PROP_CONTEXT:
g_value_set_object (value, editor->context);
break;
case PROP_XRESOLUTION:
g_value_set_double (value, editor->xresolution);
break;
case PROP_YRESOLUTION:
g_value_set_double (value, editor->yresolution);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
GtkWidget *
gimp_grid_editor_new (GimpGrid *grid,
GimpContext *context,
gdouble xresolution,
gdouble yresolution)
{
g_return_val_if_fail (GIMP_IS_GRID (grid), NULL);
return g_object_new (GIMP_TYPE_GRID_EDITOR,
"grid", grid,
"context", context,
"xresolution", xresolution,
"yresolution", yresolution,
NULL);
}
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