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-rw-r--r--app/display/gimptoolsheargrid.c360
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diff --git a/app/display/gimptoolsheargrid.c b/app/display/gimptoolsheargrid.c
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+++ b/app/display/gimptoolsheargrid.c
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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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