335 lines
11 KiB
C
335 lines
11 KiB
C
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/* 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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* pikatoolrotategrid.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 "pikatoolrotategrid.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_ANGLE
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};
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struct _PikaToolRotateGridPrivate
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{
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gdouble angle;
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gboolean rotate_grab;
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gdouble real_angle;
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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_rotate_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_rotate_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_rotate_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_rotate_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 (PikaToolRotateGrid, pika_tool_rotate_grid,
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PIKA_TYPE_TOOL_TRANSFORM_GRID)
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#define parent_class pika_tool_rotate_grid_parent_class
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static void
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pika_tool_rotate_grid_class_init (PikaToolRotateGridClass *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_rotate_grid_set_property;
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object_class->get_property = pika_tool_rotate_grid_get_property;
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widget_class->button_press = pika_tool_rotate_grid_button_press;
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widget_class->motion = pika_tool_rotate_grid_motion;
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g_object_class_install_property (object_class, PROP_ANGLE,
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g_param_spec_double ("angle",
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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_rotate_grid_init (PikaToolRotateGrid *grid)
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{
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grid->private = pika_tool_rotate_grid_get_instance_private (grid);
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}
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static void
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pika_tool_rotate_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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PikaToolRotateGrid *grid = PIKA_TOOL_ROTATE_GRID (object);
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PikaToolRotateGridPrivate *private = grid->private;
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switch (property_id)
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{
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case PROP_ANGLE:
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private->angle = 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_rotate_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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PikaToolRotateGrid *grid = PIKA_TOOL_ROTATE_GRID (object);
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PikaToolRotateGridPrivate *private = grid->private;
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switch (property_id)
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{
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case PROP_ANGLE:
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g_value_set_double (value, private->angle);
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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_rotate_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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PikaToolRotateGrid *grid = PIKA_TOOL_ROTATE_GRID (widget);
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PikaToolRotateGridPrivate *private = grid->private;
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PikaTransformHandle handle;
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handle = PIKA_TOOL_WIDGET_CLASS (parent_class)->button_press (widget,
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coords, time,
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state,
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press_type);
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if (handle == PIKA_TRANSFORM_HANDLE_ROTATION)
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{
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private->rotate_grab = TRUE;
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private->real_angle = private->angle;
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private->last_x = coords->x;
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private->last_y = coords->y;
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}
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else
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{
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private->rotate_grab = FALSE;
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}
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return handle;
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}
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void
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pika_tool_rotate_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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PikaToolRotateGrid *grid = PIKA_TOOL_ROTATE_GRID (widget);
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PikaToolRotateGridPrivate *private = grid->private;
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gdouble angle1, angle2, angle;
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gdouble pivot_x, pivot_y;
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gdouble x1, y1, x2, y2;
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gboolean constrain;
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PikaMatrix3 transform;
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if (! private->rotate_grab)
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{
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gdouble old_pivot_x;
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gdouble old_pivot_y;
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g_object_get (widget,
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"pivot-x", &old_pivot_x,
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"pivot-y", &old_pivot_y,
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NULL);
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g_object_freeze_notify (G_OBJECT (widget));
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PIKA_TOOL_WIDGET_CLASS (parent_class)->motion (widget,
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coords, time, state);
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g_object_get (widget,
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"pivot-x", &pivot_x,
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"pivot-y", &pivot_y,
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NULL);
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if (old_pivot_x != pivot_x ||
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old_pivot_y != pivot_y)
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{
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pika_matrix3_identity (&transform);
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pika_transform_matrix_rotate_center (&transform,
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pivot_x, pivot_y,
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private->angle);
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g_object_set (widget,
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"transform", &transform,
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NULL);
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}
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g_object_thaw_notify (G_OBJECT (widget));
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return;
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}
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g_object_get (widget,
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"pivot-x", &pivot_x,
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"pivot-y", &pivot_y,
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"constrain-rotate", &constrain,
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NULL);
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x1 = coords->x - pivot_x;
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x2 = private->last_x - pivot_x;
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y1 = pivot_y - coords->y;
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y2 = pivot_y - private->last_y;
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/* find the first angle */
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angle1 = atan2 (y1, x1);
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/* find the angle */
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angle2 = atan2 (y2, x2);
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angle = angle2 - angle1;
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if (angle > G_PI || angle < -G_PI)
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angle = angle2 - ((angle1 < 0) ? 2.0 * G_PI + angle1 : angle1 - 2.0 * G_PI);
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/* increment the transform tool's angle */
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private->real_angle += angle;
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/* limit the angle to between -180 and 180 degrees */
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if (private->real_angle < - G_PI)
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{
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private->real_angle += 2.0 * G_PI;
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}
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else if (private->real_angle > G_PI)
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{
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private->real_angle -= 2.0 * G_PI;
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}
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/* constrain the angle to 15-degree multiples if ctrl is held down */
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#define FIFTEEN_DEG (G_PI / 12.0)
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if (constrain)
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{
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angle = FIFTEEN_DEG * (gint) ((private->real_angle +
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FIFTEEN_DEG / 2.0) / FIFTEEN_DEG);
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}
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else
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{
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angle = private->real_angle;
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}
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pika_matrix3_identity (&transform);
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pika_transform_matrix_rotate_center (&transform, pivot_x, pivot_y, angle);
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g_object_set (widget,
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"transform", &transform,
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"angle", angle,
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NULL);
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private->last_x = coords->x;
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private->last_y = coords->y;
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}
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/* public functions */
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PikaToolWidget *
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pika_tool_rotate_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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gdouble pivot_x,
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gdouble pivot_y,
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gdouble angle)
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{
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PikaMatrix3 transform;
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g_return_val_if_fail (PIKA_IS_DISPLAY_SHELL (shell), NULL);
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pika_matrix3_identity (&transform);
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pika_transform_matrix_rotate_center (&transform, pivot_x, pivot_y, angle);
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return g_object_new (PIKA_TYPE_TOOL_ROTATE_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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"pivot-x", pivot_x,
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"pivot-y", pivot_y,
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"angle", angle,
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NULL);
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}
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