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/* GIMP - The GNU Image Manipulation Program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* gimptoolsheargrid.c
* Copyright (C) 2017 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 "core/gimp-transform-utils.h"
#include "core/gimp-utils.h"
#include "gimpdisplayshell.h"
#include "gimptoolsheargrid.h"
#include "gimp-intl.h"
enum
{
PROP_0,
PROP_ORIENTATION,
PROP_SHEAR_X,
PROP_SHEAR_Y
};
struct _GimpToolShearGridPrivate
{
GimpOrientationType orientation;
gdouble shear_x;
gdouble shear_y;
gdouble last_x;
gdouble last_y;
};
/* local function prototypes */
static void gimp_tool_shear_grid_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec);
static void gimp_tool_shear_grid_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec);
static gint gimp_tool_shear_grid_button_press (GimpToolWidget *widget,
const GimpCoords *coords,
guint32 time,
GdkModifierType state,
GimpButtonPressType press_type);
static void gimp_tool_shear_grid_motion (GimpToolWidget *widget,
const GimpCoords *coords,
guint32 time,
GdkModifierType state);
G_DEFINE_TYPE_WITH_PRIVATE (GimpToolShearGrid, gimp_tool_shear_grid,
GIMP_TYPE_TOOL_TRANSFORM_GRID)
#define parent_class gimp_tool_shear_grid_parent_class
static void
gimp_tool_shear_grid_class_init (GimpToolShearGridClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GimpToolWidgetClass *widget_class = GIMP_TOOL_WIDGET_CLASS (klass);
object_class->set_property = gimp_tool_shear_grid_set_property;
object_class->get_property = gimp_tool_shear_grid_get_property;
widget_class->button_press = gimp_tool_shear_grid_button_press;
widget_class->motion = gimp_tool_shear_grid_motion;
g_object_class_install_property (object_class, PROP_ORIENTATION,
g_param_spec_enum ("orientation",
NULL, NULL,
GIMP_TYPE_ORIENTATION_TYPE,
GIMP_ORIENTATION_UNKNOWN,
GIMP_PARAM_READWRITE |
G_PARAM_CONSTRUCT));
g_object_class_install_property (object_class, PROP_SHEAR_X,
g_param_spec_double ("shear-x",
NULL, NULL,
-GIMP_MAX_IMAGE_SIZE,
GIMP_MAX_IMAGE_SIZE,
0.0,
GIMP_PARAM_READWRITE |
G_PARAM_CONSTRUCT));
g_object_class_install_property (object_class, PROP_SHEAR_Y,
g_param_spec_double ("shear-y",
NULL, NULL,
-GIMP_MAX_IMAGE_SIZE,
GIMP_MAX_IMAGE_SIZE,
0.0,
GIMP_PARAM_READWRITE |
G_PARAM_CONSTRUCT));
}
static void
gimp_tool_shear_grid_init (GimpToolShearGrid *grid)
{
grid->private = gimp_tool_shear_grid_get_instance_private (grid);
g_object_set (grid,
"inside-function", GIMP_TRANSFORM_FUNCTION_SHEAR,
"outside-function", GIMP_TRANSFORM_FUNCTION_SHEAR,
"use-corner-handles", FALSE,
"use-perspective-handles", FALSE,
"use-side-handles", FALSE,
"use-shear-handles", FALSE,
"use-center-handle", FALSE,
"use-pivot-handle", FALSE,
NULL);
}
static void
gimp_tool_shear_grid_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec)
{
GimpToolShearGrid *grid = GIMP_TOOL_SHEAR_GRID (object);
GimpToolShearGridPrivate *private = grid->private;
switch (property_id)
{
case PROP_ORIENTATION:
private->orientation = g_value_get_enum (value);
break;
case PROP_SHEAR_X:
private->shear_x = g_value_get_double (value);
break;
case PROP_SHEAR_Y:
private->shear_y = g_value_get_double (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
gimp_tool_shear_grid_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec)
{
GimpToolShearGrid *grid = GIMP_TOOL_SHEAR_GRID (object);
GimpToolShearGridPrivate *private = grid->private;
switch (property_id)
{
case PROP_ORIENTATION:
g_value_set_enum (value, private->orientation);
break;
case PROP_SHEAR_X:
g_value_set_double (value, private->shear_x);
break;
case PROP_SHEAR_Y:
g_value_set_double (value, private->shear_y);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static gint
gimp_tool_shear_grid_button_press (GimpToolWidget *widget,
const GimpCoords *coords,
guint32 time,
GdkModifierType state,
GimpButtonPressType press_type)
{
GimpToolShearGrid *grid = GIMP_TOOL_SHEAR_GRID (widget);
GimpToolShearGridPrivate *private = grid->private;
private->last_x = coords->x;
private->last_y = coords->y;
return 1;
}
void
gimp_tool_shear_grid_motion (GimpToolWidget *widget,
const GimpCoords *coords,
guint32 time,
GdkModifierType state)
{
GimpToolShearGrid *grid = GIMP_TOOL_SHEAR_GRID (widget);
GimpToolShearGridPrivate *private = grid->private;
gdouble diffx = coords->x - private->last_x;
gdouble diffy = coords->y - private->last_y;
gdouble amount = 0.0;
GimpMatrix3 transform;
GimpMatrix3 *t;
gdouble x1, y1;
gdouble x2, y2;
gdouble tx1, ty1;
gdouble tx2, ty2;
gdouble tx3, ty3;
gdouble tx4, ty4;
gdouble current_x;
gdouble current_y;
g_object_get (widget,
"transform", &t,
"x1", &x1,
"y1", &y1,
"x2", &x2,
"y2", &y2,
NULL);
gimp_matrix3_transform_point (t, x1, y1, &tx1, &ty1);
gimp_matrix3_transform_point (t, x2, y1, &tx2, &ty2);
gimp_matrix3_transform_point (t, x1, y2, &tx3, &ty3);
gimp_matrix3_transform_point (t, x2, y2, &tx4, &ty4);
g_free (t);
current_x = coords->x;
current_y = coords->y;
diffx = current_x - private->last_x;
diffy = current_y - private->last_y;
/* If we haven't yet decided on which way to control shearing
* decide using the maximum differential
*/
if (private->orientation == GIMP_ORIENTATION_UNKNOWN)
{
#define MIN_MOVE 5
if (ABS (diffx) > MIN_MOVE || ABS (diffy) > MIN_MOVE)
{
if (ABS (diffx) > ABS (diffy))
{
private->orientation = GIMP_ORIENTATION_HORIZONTAL;
private->shear_x = 0.0;
}
else
{
private->orientation = GIMP_ORIENTATION_VERTICAL;
private->shear_y = 0.0;
}
}
/* set the current coords to the last ones */
else
{
current_x = private->last_x;
current_y = private->last_y;
}
}
/* if the direction is known, keep track of the magnitude */
if (private->orientation == GIMP_ORIENTATION_HORIZONTAL)
{
if (current_y > (ty1 + ty3) / 2)
private->shear_x += diffx;
else
private->shear_x -= diffx;
amount = private->shear_x;
}
else if (private->orientation == GIMP_ORIENTATION_VERTICAL)
{
if (current_x > (tx1 + tx2) / 2)
private->shear_y += diffy;
else
private->shear_y -= diffy;
amount = private->shear_y;
}
gimp_matrix3_identity (&transform);
gimp_transform_matrix_shear (&transform,
x1, y1, x2 - x1, y2 - y1,
private->orientation, amount);
g_object_set (widget,
"transform", &transform,
"orientation", private->orientation,
"shear-x", private->shear_x,
"shear_y", private->shear_y,
NULL);
private->last_x = current_x;
private->last_y = current_y;
}
/* public functions */
GimpToolWidget *
gimp_tool_shear_grid_new (GimpDisplayShell *shell,
gdouble x1,
gdouble y1,
gdouble x2,
gdouble y2,
GimpOrientationType orientation,
gdouble shear_x,
gdouble shear_y)
{
GimpMatrix3 transform;
gdouble amount;
g_return_val_if_fail (GIMP_IS_DISPLAY_SHELL (shell), NULL);
if (orientation == GIMP_ORIENTATION_HORIZONTAL)
amount = shear_x;
else
amount = shear_y;
gimp_matrix3_identity (&transform);
gimp_transform_matrix_shear (&transform,
x1, y1, x2 - x1, y2 - y1,
orientation, amount);
return g_object_new (GIMP_TYPE_TOOL_SHEAR_GRID,
"shell", shell,
"transform", &transform,
"x1", x1,
"y1", y1,
"x2", x2,
"y2", y2,
"orientation", orientation,
"shear-x", shear_x,
"shear-y", shear_y,
NULL);
}
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