365 lines
12 KiB
C
365 lines
12 KiB
C
/* PIKA - Photo and Image Kooker Application
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* a rebranding of The GNU Image Manipulation Program (created with heckimp)
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* A derived work which may be trivial. However, any changes may be (C)2023 by Aldercone Studio
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*
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* Original copyright, applying to most contents (license remains unchanged):
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* Copyright (C) 1995 Spencer Kimball and Peter Mattis
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*
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* pikatoolsheargrid.c
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* Copyright (C) 2017 Michael Natterer <mitch@gimp.org>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#include "config.h"
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#include <gegl.h>
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#include <gtk/gtk.h>
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#include "libpikabase/pikabase.h"
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#include "libpikamath/pikamath.h"
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#include "display-types.h"
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#include "core/pika-transform-utils.h"
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#include "core/pika-utils.h"
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#include "pikadisplayshell.h"
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#include "pikatoolsheargrid.h"
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#include "pika-intl.h"
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enum
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{
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PROP_0,
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PROP_ORIENTATION,
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PROP_SHEAR_X,
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PROP_SHEAR_Y
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};
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struct _PikaToolShearGridPrivate
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{
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PikaOrientationType orientation;
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gdouble shear_x;
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gdouble shear_y;
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gdouble last_x;
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gdouble last_y;
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};
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/* local function prototypes */
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static void pika_tool_shear_grid_set_property (GObject *object,
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guint property_id,
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const GValue *value,
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GParamSpec *pspec);
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static void pika_tool_shear_grid_get_property (GObject *object,
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guint property_id,
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GValue *value,
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GParamSpec *pspec);
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static gint pika_tool_shear_grid_button_press (PikaToolWidget *widget,
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const PikaCoords *coords,
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guint32 time,
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GdkModifierType state,
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PikaButtonPressType press_type);
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static void pika_tool_shear_grid_motion (PikaToolWidget *widget,
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const PikaCoords *coords,
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guint32 time,
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GdkModifierType state);
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G_DEFINE_TYPE_WITH_PRIVATE (PikaToolShearGrid, pika_tool_shear_grid,
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PIKA_TYPE_TOOL_TRANSFORM_GRID)
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#define parent_class pika_tool_shear_grid_parent_class
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static void
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pika_tool_shear_grid_class_init (PikaToolShearGridClass *klass)
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{
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GObjectClass *object_class = G_OBJECT_CLASS (klass);
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PikaToolWidgetClass *widget_class = PIKA_TOOL_WIDGET_CLASS (klass);
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object_class->set_property = pika_tool_shear_grid_set_property;
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object_class->get_property = pika_tool_shear_grid_get_property;
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widget_class->button_press = pika_tool_shear_grid_button_press;
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widget_class->motion = pika_tool_shear_grid_motion;
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g_object_class_install_property (object_class, PROP_ORIENTATION,
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g_param_spec_enum ("orientation",
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NULL, NULL,
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PIKA_TYPE_ORIENTATION_TYPE,
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PIKA_ORIENTATION_UNKNOWN,
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PIKA_PARAM_READWRITE |
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G_PARAM_CONSTRUCT));
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g_object_class_install_property (object_class, PROP_SHEAR_X,
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g_param_spec_double ("shear-x",
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NULL, NULL,
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-PIKA_MAX_IMAGE_SIZE,
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PIKA_MAX_IMAGE_SIZE,
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0.0,
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PIKA_PARAM_READWRITE |
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G_PARAM_CONSTRUCT));
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g_object_class_install_property (object_class, PROP_SHEAR_Y,
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g_param_spec_double ("shear-y",
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NULL, NULL,
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-PIKA_MAX_IMAGE_SIZE,
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PIKA_MAX_IMAGE_SIZE,
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0.0,
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PIKA_PARAM_READWRITE |
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G_PARAM_CONSTRUCT));
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}
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static void
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pika_tool_shear_grid_init (PikaToolShearGrid *grid)
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{
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grid->private = pika_tool_shear_grid_get_instance_private (grid);
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g_object_set (grid,
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"inside-function", PIKA_TRANSFORM_FUNCTION_SHEAR,
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"outside-function", PIKA_TRANSFORM_FUNCTION_SHEAR,
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"use-corner-handles", FALSE,
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"use-perspective-handles", FALSE,
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"use-side-handles", FALSE,
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"use-shear-handles", FALSE,
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"use-center-handle", FALSE,
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"use-pivot-handle", FALSE,
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NULL);
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}
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static void
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pika_tool_shear_grid_set_property (GObject *object,
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guint property_id,
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const GValue *value,
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GParamSpec *pspec)
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{
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PikaToolShearGrid *grid = PIKA_TOOL_SHEAR_GRID (object);
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PikaToolShearGridPrivate *private = grid->private;
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switch (property_id)
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{
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case PROP_ORIENTATION:
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private->orientation = g_value_get_enum (value);
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break;
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case PROP_SHEAR_X:
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private->shear_x = g_value_get_double (value);
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break;
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case PROP_SHEAR_Y:
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private->shear_y = g_value_get_double (value);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
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break;
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}
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}
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static void
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pika_tool_shear_grid_get_property (GObject *object,
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guint property_id,
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GValue *value,
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GParamSpec *pspec)
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{
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PikaToolShearGrid *grid = PIKA_TOOL_SHEAR_GRID (object);
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PikaToolShearGridPrivate *private = grid->private;
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switch (property_id)
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{
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case PROP_ORIENTATION:
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g_value_set_enum (value, private->orientation);
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break;
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case PROP_SHEAR_X:
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g_value_set_double (value, private->shear_x);
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break;
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case PROP_SHEAR_Y:
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g_value_set_double (value, private->shear_y);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
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break;
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}
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}
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static gint
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pika_tool_shear_grid_button_press (PikaToolWidget *widget,
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const PikaCoords *coords,
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guint32 time,
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GdkModifierType state,
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PikaButtonPressType press_type)
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{
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PikaToolShearGrid *grid = PIKA_TOOL_SHEAR_GRID (widget);
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PikaToolShearGridPrivate *private = grid->private;
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private->last_x = coords->x;
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private->last_y = coords->y;
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return 1;
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}
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void
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pika_tool_shear_grid_motion (PikaToolWidget *widget,
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const PikaCoords *coords,
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guint32 time,
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GdkModifierType state)
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{
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PikaToolShearGrid *grid = PIKA_TOOL_SHEAR_GRID (widget);
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PikaToolShearGridPrivate *private = grid->private;
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gdouble diffx = coords->x - private->last_x;
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gdouble diffy = coords->y - private->last_y;
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gdouble amount = 0.0;
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PikaMatrix3 transform;
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PikaMatrix3 *t;
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gdouble x1, y1;
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gdouble x2, y2;
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gdouble tx1, ty1;
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gdouble tx2, ty2;
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gdouble tx3, ty3;
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gdouble tx4, ty4;
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gdouble current_x;
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gdouble current_y;
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g_object_get (widget,
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"transform", &t,
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"x1", &x1,
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"y1", &y1,
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"x2", &x2,
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"y2", &y2,
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NULL);
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pika_matrix3_transform_point (t, x1, y1, &tx1, &ty1);
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pika_matrix3_transform_point (t, x2, y1, &tx2, &ty2);
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pika_matrix3_transform_point (t, x1, y2, &tx3, &ty3);
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pika_matrix3_transform_point (t, x2, y2, &tx4, &ty4);
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g_free (t);
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current_x = coords->x;
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current_y = coords->y;
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diffx = current_x - private->last_x;
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diffy = current_y - private->last_y;
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/* If we haven't yet decided on which way to control shearing
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* decide using the maximum differential
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*/
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if (private->orientation == PIKA_ORIENTATION_UNKNOWN)
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{
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#define MIN_MOVE 5
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if (ABS (diffx) > MIN_MOVE || ABS (diffy) > MIN_MOVE)
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{
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if (ABS (diffx) > ABS (diffy))
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{
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private->orientation = PIKA_ORIENTATION_HORIZONTAL;
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private->shear_x = 0.0;
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}
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else
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{
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private->orientation = PIKA_ORIENTATION_VERTICAL;
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private->shear_y = 0.0;
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}
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}
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/* set the current coords to the last ones */
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else
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{
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current_x = private->last_x;
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current_y = private->last_y;
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}
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}
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/* if the direction is known, keep track of the magnitude */
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if (private->orientation == PIKA_ORIENTATION_HORIZONTAL)
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{
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if (current_y > (ty1 + ty3) / 2)
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private->shear_x += diffx;
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else
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private->shear_x -= diffx;
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amount = private->shear_x;
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}
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else if (private->orientation == PIKA_ORIENTATION_VERTICAL)
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{
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if (current_x > (tx1 + tx2) / 2)
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private->shear_y += diffy;
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else
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private->shear_y -= diffy;
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amount = private->shear_y;
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}
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pika_matrix3_identity (&transform);
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pika_transform_matrix_shear (&transform,
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x1, y1, x2 - x1, y2 - y1,
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private->orientation, amount);
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g_object_set (widget,
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"transform", &transform,
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"orientation", private->orientation,
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"shear-x", private->shear_x,
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"shear_y", private->shear_y,
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NULL);
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private->last_x = current_x;
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private->last_y = current_y;
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}
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/* public functions */
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PikaToolWidget *
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pika_tool_shear_grid_new (PikaDisplayShell *shell,
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gdouble x1,
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gdouble y1,
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gdouble x2,
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gdouble y2,
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PikaOrientationType orientation,
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gdouble shear_x,
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gdouble shear_y)
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{
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PikaMatrix3 transform;
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gdouble amount;
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g_return_val_if_fail (PIKA_IS_DISPLAY_SHELL (shell), NULL);
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if (orientation == PIKA_ORIENTATION_HORIZONTAL)
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amount = shear_x;
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else
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amount = shear_y;
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pika_matrix3_identity (&transform);
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pika_transform_matrix_shear (&transform,
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x1, y1, x2 - x1, y2 - y1,
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orientation, amount);
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return g_object_new (PIKA_TYPE_TOOL_SHEAR_GRID,
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"shell", shell,
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"transform", &transform,
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"x1", x1,
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"y1", y1,
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"x2", x2,
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"y2", y2,
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"orientation", orientation,
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"shear-x", shear_x,
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"shear-y", shear_y,
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NULL);
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}
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