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-rw-r--r--app/display/gimptoolrotategrid.c330
1 files changed, 330 insertions, 0 deletions
diff --git a/app/display/gimptoolrotategrid.c b/app/display/gimptoolrotategrid.c
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+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimptoolrotategrid.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 "gimptoolrotategrid.h"
+
+#include "gimp-intl.h"
+
+
+enum
+{
+ PROP_0,
+ PROP_ANGLE
+};
+
+
+struct _GimpToolRotateGridPrivate
+{
+ gdouble angle;
+
+ gboolean rotate_grab;
+ gdouble real_angle;
+ gdouble last_x;
+ gdouble last_y;
+};
+
+
+/* local function prototypes */
+
+static void gimp_tool_rotate_grid_set_property (GObject *object,
+ guint property_id,
+ const GValue *value,
+ GParamSpec *pspec);
+static void gimp_tool_rotate_grid_get_property (GObject *object,
+ guint property_id,
+ GValue *value,
+ GParamSpec *pspec);
+
+static gint gimp_tool_rotate_grid_button_press (GimpToolWidget *widget,
+ const GimpCoords *coords,
+ guint32 time,
+ GdkModifierType state,
+ GimpButtonPressType press_type);
+static void gimp_tool_rotate_grid_motion (GimpToolWidget *widget,
+ const GimpCoords *coords,
+ guint32 time,
+ GdkModifierType state);
+
+
+G_DEFINE_TYPE_WITH_PRIVATE (GimpToolRotateGrid, gimp_tool_rotate_grid,
+ GIMP_TYPE_TOOL_TRANSFORM_GRID)
+
+#define parent_class gimp_tool_rotate_grid_parent_class
+
+
+static void
+gimp_tool_rotate_grid_class_init (GimpToolRotateGridClass *klass)
+{
+ GObjectClass *object_class = G_OBJECT_CLASS (klass);
+ GimpToolWidgetClass *widget_class = GIMP_TOOL_WIDGET_CLASS (klass);
+
+ object_class->set_property = gimp_tool_rotate_grid_set_property;
+ object_class->get_property = gimp_tool_rotate_grid_get_property;
+
+ widget_class->button_press = gimp_tool_rotate_grid_button_press;
+ widget_class->motion = gimp_tool_rotate_grid_motion;
+
+ g_object_class_install_property (object_class, PROP_ANGLE,
+ g_param_spec_double ("angle",
+ NULL, NULL,
+ -GIMP_MAX_IMAGE_SIZE,
+ GIMP_MAX_IMAGE_SIZE,
+ 0.0,
+ GIMP_PARAM_READWRITE |
+ G_PARAM_CONSTRUCT));
+}
+
+static void
+gimp_tool_rotate_grid_init (GimpToolRotateGrid *grid)
+{
+ grid->private = gimp_tool_rotate_grid_get_instance_private (grid);
+}
+
+static void
+gimp_tool_rotate_grid_set_property (GObject *object,
+ guint property_id,
+ const GValue *value,
+ GParamSpec *pspec)
+{
+ GimpToolRotateGrid *grid = GIMP_TOOL_ROTATE_GRID (object);
+ GimpToolRotateGridPrivate *private = grid->private;
+
+ switch (property_id)
+ {
+ case PROP_ANGLE:
+ private->angle = g_value_get_double (value);
+ break;
+
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+ break;
+ }
+}
+
+static void
+gimp_tool_rotate_grid_get_property (GObject *object,
+ guint property_id,
+ GValue *value,
+ GParamSpec *pspec)
+{
+ GimpToolRotateGrid *grid = GIMP_TOOL_ROTATE_GRID (object);
+ GimpToolRotateGridPrivate *private = grid->private;
+
+ switch (property_id)
+ {
+ case PROP_ANGLE:
+ g_value_set_double (value, private->angle);
+ break;
+
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+ break;
+ }
+}
+
+static gint
+gimp_tool_rotate_grid_button_press (GimpToolWidget *widget,
+ const GimpCoords *coords,
+ guint32 time,
+ GdkModifierType state,
+ GimpButtonPressType press_type)
+{
+ GimpToolRotateGrid *grid = GIMP_TOOL_ROTATE_GRID (widget);
+ GimpToolRotateGridPrivate *private = grid->private;
+ GimpTransformHandle handle;
+
+ handle = GIMP_TOOL_WIDGET_CLASS (parent_class)->button_press (widget,
+ coords, time,
+ state,
+ press_type);
+
+ if (handle == GIMP_TRANSFORM_HANDLE_ROTATION)
+ {
+ private->rotate_grab = TRUE;
+ private->real_angle = private->angle;
+ private->last_x = coords->x;
+ private->last_y = coords->y;
+ }
+ else
+ {
+ private->rotate_grab = FALSE;
+ }
+
+ return handle;
+}
+
+void
+gimp_tool_rotate_grid_motion (GimpToolWidget *widget,
+ const GimpCoords *coords,
+ guint32 time,
+ GdkModifierType state)
+{
+ GimpToolRotateGrid *grid = GIMP_TOOL_ROTATE_GRID (widget);
+ GimpToolRotateGridPrivate *private = grid->private;
+ gdouble angle1, angle2, angle;
+ gdouble pivot_x, pivot_y;
+ gdouble x1, y1, x2, y2;
+ gboolean constrain;
+ GimpMatrix3 transform;
+
+ if (! private->rotate_grab)
+ {
+ gdouble old_pivot_x;
+ gdouble old_pivot_y;
+
+ g_object_get (widget,
+ "pivot-x", &old_pivot_x,
+ "pivot-y", &old_pivot_y,
+ NULL);
+
+ g_object_freeze_notify (G_OBJECT (widget));
+
+ GIMP_TOOL_WIDGET_CLASS (parent_class)->motion (widget,
+ coords, time, state);
+
+ g_object_get (widget,
+ "pivot-x", &pivot_x,
+ "pivot-y", &pivot_y,
+ NULL);
+
+ if (old_pivot_x != pivot_x ||
+ old_pivot_y != pivot_y)
+ {
+ gimp_matrix3_identity (&transform);
+ gimp_transform_matrix_rotate_center (&transform,
+ pivot_x, pivot_y,
+ private->angle);
+
+ g_object_set (widget,
+ "transform", &transform,
+ NULL);
+ }
+
+ g_object_thaw_notify (G_OBJECT (widget));
+
+ return;
+ }
+
+ g_object_get (widget,
+ "pivot-x", &pivot_x,
+ "pivot-y", &pivot_y,
+ "constrain-rotate", &constrain,
+ NULL);
+
+ x1 = coords->x - pivot_x;
+ x2 = private->last_x - pivot_x;
+ y1 = pivot_y - coords->y;
+ y2 = pivot_y - private->last_y;
+
+ /* find the first angle */
+ angle1 = atan2 (y1, x1);
+
+ /* find the angle */
+ angle2 = atan2 (y2, x2);
+
+ angle = angle2 - angle1;
+
+ if (angle > G_PI || angle < -G_PI)
+ angle = angle2 - ((angle1 < 0) ? 2.0 * G_PI + angle1 : angle1 - 2.0 * G_PI);
+
+ /* increment the transform tool's angle */
+ private->real_angle += angle;
+
+ /* limit the angle to between -180 and 180 degrees */
+ if (private->real_angle < - G_PI)
+ {
+ private->real_angle += 2.0 * G_PI;
+ }
+ else if (private->real_angle > G_PI)
+ {
+ private->real_angle -= 2.0 * G_PI;
+ }
+
+ /* constrain the angle to 15-degree multiples if ctrl is held down */
+#define FIFTEEN_DEG (G_PI / 12.0)
+
+ if (constrain)
+ {
+ angle = FIFTEEN_DEG * (gint) ((private->real_angle +
+ FIFTEEN_DEG / 2.0) / FIFTEEN_DEG);
+ }
+ else
+ {
+ angle = private->real_angle;
+ }
+
+ gimp_matrix3_identity (&transform);
+ gimp_transform_matrix_rotate_center (&transform, pivot_x, pivot_y, angle);
+
+ g_object_set (widget,
+ "transform", &transform,
+ "angle", angle,
+ NULL);
+
+ private->last_x = coords->x;
+ private->last_y = coords->y;
+}
+
+
+/* public functions */
+
+GimpToolWidget *
+gimp_tool_rotate_grid_new (GimpDisplayShell *shell,
+ gdouble x1,
+ gdouble y1,
+ gdouble x2,
+ gdouble y2,
+ gdouble pivot_x,
+ gdouble pivot_y,
+ gdouble angle)
+{
+ GimpMatrix3 transform;
+
+ g_return_val_if_fail (GIMP_IS_DISPLAY_SHELL (shell), NULL);
+
+ gimp_matrix3_identity (&transform);
+ gimp_transform_matrix_rotate_center (&transform, pivot_x, pivot_y, angle);
+
+ return g_object_new (GIMP_TYPE_TOOL_ROTATE_GRID,
+ "shell", shell,
+ "transform", &transform,
+ "x1", x1,
+ "y1", y1,
+ "x2", x2,
+ "y2", y2,
+ "pivot-x", pivot_x,
+ "pivot-y", pivot_y,
+ "angle", angle,
+ NULL);
+}
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