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-rw-r--r--app/display/gimpcanvasrectangleguides.c422
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diff --git a/app/display/gimpcanvasrectangleguides.c b/app/display/gimpcanvasrectangleguides.c
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+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpcanvasrectangleguides.c
+ * Copyright (C) 2011 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 "gimpcanvasrectangleguides.h"
+#include "gimpdisplayshell.h"
+
+
+#define SQRT5 2.236067977
+
+
+enum
+{
+ PROP_0,
+ PROP_X,
+ PROP_Y,
+ PROP_WIDTH,
+ PROP_HEIGHT,
+ PROP_TYPE,
+ PROP_N_GUIDES
+};
+
+
+typedef struct _GimpCanvasRectangleGuidesPrivate GimpCanvasRectangleGuidesPrivate;
+
+struct _GimpCanvasRectangleGuidesPrivate
+{
+ gdouble x;
+ gdouble y;
+ gdouble width;
+ gdouble height;
+ GimpGuidesType type;
+ gint n_guides;
+};
+
+#define GET_PRIVATE(rectangle) \
+ ((GimpCanvasRectangleGuidesPrivate *) gimp_canvas_rectangle_guides_get_instance_private ((GimpCanvasRectangleGuides *) (rectangle)))
+
+
+/* local function prototypes */
+
+static void gimp_canvas_rectangle_guides_set_property (GObject *object,
+ guint property_id,
+ const GValue *value,
+ GParamSpec *pspec);
+static void gimp_canvas_rectangle_guides_get_property (GObject *object,
+ guint property_id,
+ GValue *value,
+ GParamSpec *pspec);
+static void gimp_canvas_rectangle_guides_draw (GimpCanvasItem *item,
+ cairo_t *cr);
+static cairo_region_t * gimp_canvas_rectangle_guides_get_extents (GimpCanvasItem *item);
+
+
+G_DEFINE_TYPE_WITH_PRIVATE (GimpCanvasRectangleGuides,
+ gimp_canvas_rectangle_guides, GIMP_TYPE_CANVAS_ITEM)
+
+#define parent_class gimp_canvas_rectangle_guides_parent_class
+
+
+static void
+gimp_canvas_rectangle_guides_class_init (GimpCanvasRectangleGuidesClass *klass)
+{
+ GObjectClass *object_class = G_OBJECT_CLASS (klass);
+ GimpCanvasItemClass *item_class = GIMP_CANVAS_ITEM_CLASS (klass);
+
+ object_class->set_property = gimp_canvas_rectangle_guides_set_property;
+ object_class->get_property = gimp_canvas_rectangle_guides_get_property;
+
+ item_class->draw = gimp_canvas_rectangle_guides_draw;
+ item_class->get_extents = gimp_canvas_rectangle_guides_get_extents;
+
+ g_object_class_install_property (object_class, PROP_X,
+ g_param_spec_double ("x", NULL, NULL,
+ -GIMP_MAX_IMAGE_SIZE,
+ GIMP_MAX_IMAGE_SIZE, 0,
+ GIMP_PARAM_READWRITE));
+
+ g_object_class_install_property (object_class, PROP_Y,
+ g_param_spec_double ("y", NULL, NULL,
+ -GIMP_MAX_IMAGE_SIZE,
+ GIMP_MAX_IMAGE_SIZE, 0,
+ GIMP_PARAM_READWRITE));
+
+ g_object_class_install_property (object_class, PROP_WIDTH,
+ g_param_spec_double ("width", NULL, NULL,
+ -GIMP_MAX_IMAGE_SIZE,
+ GIMP_MAX_IMAGE_SIZE, 0,
+ GIMP_PARAM_READWRITE));
+
+ g_object_class_install_property (object_class, PROP_HEIGHT,
+ g_param_spec_double ("height", NULL, NULL,
+ -GIMP_MAX_IMAGE_SIZE,
+ GIMP_MAX_IMAGE_SIZE, 0,
+ GIMP_PARAM_READWRITE));
+
+ g_object_class_install_property (object_class, PROP_TYPE,
+ g_param_spec_enum ("type", NULL, NULL,
+ GIMP_TYPE_GUIDES_TYPE,
+ GIMP_GUIDES_NONE,
+ GIMP_PARAM_READWRITE));
+
+ g_object_class_install_property (object_class, PROP_N_GUIDES,
+ g_param_spec_int ("n-guides", NULL, NULL,
+ 1, 128, 4,
+ GIMP_PARAM_READWRITE));
+}
+
+static void
+gimp_canvas_rectangle_guides_init (GimpCanvasRectangleGuides *rectangle)
+{
+}
+
+static void
+gimp_canvas_rectangle_guides_set_property (GObject *object,
+ guint property_id,
+ const GValue *value,
+ GParamSpec *pspec)
+{
+ GimpCanvasRectangleGuidesPrivate *private = GET_PRIVATE (object);
+
+ switch (property_id)
+ {
+ case PROP_X:
+ private->x = g_value_get_double (value);
+ break;
+ case PROP_Y:
+ private->y = g_value_get_double (value);
+ break;
+ case PROP_WIDTH:
+ private->width = g_value_get_double (value);
+ break;
+ case PROP_HEIGHT:
+ private->height = g_value_get_double (value);
+ break;
+ case PROP_TYPE:
+ private->type = g_value_get_enum (value);
+ break;
+ case PROP_N_GUIDES:
+ private->n_guides = g_value_get_int (value);
+ break;
+
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+ break;
+ }
+}
+
+static void
+gimp_canvas_rectangle_guides_get_property (GObject *object,
+ guint property_id,
+ GValue *value,
+ GParamSpec *pspec)
+{
+ GimpCanvasRectangleGuidesPrivate *private = GET_PRIVATE (object);
+
+ switch (property_id)
+ {
+ case PROP_X:
+ g_value_set_double (value, private->x);
+ break;
+ case PROP_Y:
+ g_value_set_double (value, private->y);
+ break;
+ case PROP_WIDTH:
+ g_value_set_double (value, private->width);
+ break;
+ case PROP_HEIGHT:
+ g_value_set_double (value, private->height);
+ break;
+ case PROP_TYPE:
+ g_value_set_enum (value, private->type);
+ break;
+ case PROP_N_GUIDES:
+ g_value_set_int (value, private->n_guides);
+ break;
+
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+ break;
+ }
+}
+
+static void
+gimp_canvas_rectangle_guides_transform (GimpCanvasItem *item,
+ gdouble *x1,
+ gdouble *y1,
+ gdouble *x2,
+ gdouble *y2)
+{
+ GimpCanvasRectangleGuidesPrivate *private = GET_PRIVATE (item);
+
+ gimp_canvas_item_transform_xy_f (item,
+ MIN (private->x,
+ private->x + private->width),
+ MIN (private->y,
+ private->y + private->height),
+ x1, y1);
+ gimp_canvas_item_transform_xy_f (item,
+ MAX (private->x,
+ private->x + private->width),
+ MAX (private->y,
+ private->y + private->height),
+ x2, y2);
+
+ *x1 = floor (*x1) + 0.5;
+ *y1 = floor (*y1) + 0.5;
+ *x2 = ceil (*x2) - 0.5;
+ *y2 = ceil (*y2) - 0.5;
+
+ *x2 = MAX (*x1, *x2);
+ *y2 = MAX (*y1, *y2);
+}
+
+static void
+draw_hline (cairo_t *cr,
+ gdouble x1,
+ gdouble x2,
+ gdouble y)
+{
+ y = floor (y) + 0.5;
+
+ cairo_move_to (cr, x1, y);
+ cairo_line_to (cr, x2, y);
+}
+
+static void
+draw_vline (cairo_t *cr,
+ gdouble y1,
+ gdouble y2,
+ gdouble x)
+{
+ x = floor (x) + 0.5;
+
+ cairo_move_to (cr, x, y1);
+ cairo_line_to (cr, x, y2);
+}
+
+static void
+gimp_canvas_rectangle_guides_draw (GimpCanvasItem *item,
+ cairo_t *cr)
+{
+ GimpCanvasRectangleGuidesPrivate *private = GET_PRIVATE (item);
+ gdouble x1, y1;
+ gdouble x2, y2;
+ gint i;
+
+ gimp_canvas_rectangle_guides_transform (item, &x1, &y1, &x2, &y2);
+
+ switch (private->type)
+ {
+ case GIMP_GUIDES_NONE:
+ break;
+
+ case GIMP_GUIDES_CENTER_LINES:
+ draw_hline (cr, x1, x2, (y1 + y2) / 2);
+ draw_vline (cr, y1, y2, (x1 + x2) / 2);
+ break;
+
+ case GIMP_GUIDES_THIRDS:
+ draw_hline (cr, x1, x2, (2 * y1 + y2) / 3);
+ draw_hline (cr, x1, x2, ( y1 + 2 * y2) / 3);
+
+ draw_vline (cr, y1, y2, (2 * x1 + x2) / 3);
+ draw_vline (cr, y1, y2, ( x1 + 2 * x2) / 3);
+ break;
+
+ case GIMP_GUIDES_FIFTHS:
+ for (i = 0; i < 5; i++)
+ {
+ draw_hline (cr, x1, x2, y1 + i * (y2 - y1) / 5);
+ draw_vline (cr, y1, y2, x1 + i * (x2 - x1) / 5);
+ }
+ break;
+
+ case GIMP_GUIDES_GOLDEN:
+ draw_hline (cr, x1, x2, (2 * y1 + (1 + SQRT5) * y2) / (3 + SQRT5));
+ draw_hline (cr, x1, x2, ((1 + SQRT5) * y1 + 2 * y2) / (3 + SQRT5));
+
+ draw_vline (cr, y1, y2, (2 * x1 + (1 + SQRT5) * x2) / (3 + SQRT5));
+ draw_vline (cr, y1, y2, ((1 + SQRT5) * x1 + 2 * x2) / (3 + SQRT5));
+ break;
+
+ /* This code implements the method of diagonals discovered by
+ * Edwin Westhoff - see http://www.diagonalmethod.info/
+ */
+ case GIMP_GUIDES_DIAGONALS:
+ {
+ /* the side of the largest square that can be
+ * fitted in whole into the rectangle (x1, y1), (x2, y2)
+ */
+ const gdouble square_side = MIN (x2 - x1, y2 - y1);
+
+ /* diagonal from the top-left edge */
+ cairo_move_to (cr, x1, y1);
+ cairo_line_to (cr, x1 + square_side, y1 + square_side);
+
+ /* diagonal from the top-right edge */
+ cairo_move_to (cr, x2, y1);
+ cairo_line_to (cr, x2 - square_side, y1 + square_side);
+
+ /* diagonal from the bottom-left edge */
+ cairo_move_to (cr, x1, y2);
+ cairo_line_to (cr, x1 + square_side, y2 - square_side);
+
+ /* diagonal from the bottom-right edge */
+ cairo_move_to (cr, x2, y2);
+ cairo_line_to (cr, x2 - square_side, y2 - square_side);
+ }
+ break;
+
+ case GIMP_GUIDES_N_LINES:
+ for (i = 0; i < private->n_guides; i++)
+ {
+ draw_hline (cr, x1, x2, y1 + i * (y2 - y1) / private->n_guides);
+ draw_vline (cr, y1, y2, x1 + i * (x2 - x1) / private->n_guides);
+ }
+ break;
+
+ case GIMP_GUIDES_SPACING:
+ break;
+ }
+
+ _gimp_canvas_item_stroke (item, cr);
+}
+
+static cairo_region_t *
+gimp_canvas_rectangle_guides_get_extents (GimpCanvasItem *item)
+{
+ GimpCanvasRectangleGuidesPrivate *private = GET_PRIVATE (item);
+
+ if (private->type != GIMP_GUIDES_NONE)
+ {
+ cairo_rectangle_int_t rectangle;
+ gdouble x1, y1;
+ gdouble x2, y2;
+
+ gimp_canvas_rectangle_guides_transform (item, &x1, &y1, &x2, &y2);
+
+ rectangle.x = floor (x1 - 1.5);
+ rectangle.y = floor (y1 - 1.5);
+ rectangle.width = ceil (x2 - x1 + 3.0);
+ rectangle.height = ceil (y2 - y1 + 3.0);
+
+ return cairo_region_create_rectangle (&rectangle);
+ }
+
+ return NULL;
+}
+
+GimpCanvasItem *
+gimp_canvas_rectangle_guides_new (GimpDisplayShell *shell,
+ gdouble x,
+ gdouble y,
+ gdouble width,
+ gdouble height,
+ GimpGuidesType type,
+ gint n_guides)
+{
+ g_return_val_if_fail (GIMP_IS_DISPLAY_SHELL (shell), NULL);
+
+ return g_object_new (GIMP_TYPE_CANVAS_RECTANGLE_GUIDES,
+ "shell", shell,
+ "x", x,
+ "y", y,
+ "width", width,
+ "height", height,
+ "type", type,
+ "n-guides", n_guides,
+ NULL);
+}
+
+void
+gimp_canvas_rectangle_guides_set (GimpCanvasItem *rectangle,
+ gdouble x,
+ gdouble y,
+ gdouble width,
+ gdouble height,
+ GimpGuidesType type,
+ gint n_guides)
+{
+ g_return_if_fail (GIMP_IS_CANVAS_RECTANGLE_GUIDES (rectangle));
+
+ gimp_canvas_item_begin_change (rectangle);
+
+ g_object_set (rectangle,
+ "x", x,
+ "y", y,
+ "width", width,
+ "height", height,
+ "type", type,
+ "n-guides", n_guides,
+ NULL);
+
+ gimp_canvas_item_end_change (rectangle);
+}
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