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-rw-r--r--app/display/gimpcanvasguide.c295
1 files changed, 295 insertions, 0 deletions
diff --git a/app/display/gimpcanvasguide.c b/app/display/gimpcanvasguide.c
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+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpcanvasguide.c
+ * Copyright (C) 2010 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 "gimpcanvas-style.h"
+#include "gimpcanvasguide.h"
+#include "gimpdisplayshell.h"
+
+
+enum
+{
+ PROP_0,
+ PROP_ORIENTATION,
+ PROP_POSITION,
+ PROP_STYLE
+};
+
+
+typedef struct _GimpCanvasGuidePrivate GimpCanvasGuidePrivate;
+
+struct _GimpCanvasGuidePrivate
+{
+ GimpOrientationType orientation;
+ gint position;
+
+ GimpGuideStyle style;
+};
+
+#define GET_PRIVATE(guide) \
+ ((GimpCanvasGuidePrivate *) gimp_canvas_guide_get_instance_private ((GimpCanvasGuide *) (guide)))
+
+
+/* local function prototypes */
+
+static void gimp_canvas_guide_set_property (GObject *object,
+ guint property_id,
+ const GValue *value,
+ GParamSpec *pspec);
+static void gimp_canvas_guide_get_property (GObject *object,
+ guint property_id,
+ GValue *value,
+ GParamSpec *pspec);
+static void gimp_canvas_guide_draw (GimpCanvasItem *item,
+ cairo_t *cr);
+static cairo_region_t * gimp_canvas_guide_get_extents (GimpCanvasItem *item);
+static void gimp_canvas_guide_stroke (GimpCanvasItem *item,
+ cairo_t *cr);
+
+
+G_DEFINE_TYPE_WITH_PRIVATE (GimpCanvasGuide, gimp_canvas_guide,
+ GIMP_TYPE_CANVAS_ITEM)
+
+#define parent_class gimp_canvas_guide_parent_class
+
+
+static void
+gimp_canvas_guide_class_init (GimpCanvasGuideClass *klass)
+{
+ GObjectClass *object_class = G_OBJECT_CLASS (klass);
+ GimpCanvasItemClass *item_class = GIMP_CANVAS_ITEM_CLASS (klass);
+
+ object_class->set_property = gimp_canvas_guide_set_property;
+ object_class->get_property = gimp_canvas_guide_get_property;
+
+ item_class->draw = gimp_canvas_guide_draw;
+ item_class->get_extents = gimp_canvas_guide_get_extents;
+ item_class->stroke = gimp_canvas_guide_stroke;
+
+ g_object_class_install_property (object_class, PROP_ORIENTATION,
+ g_param_spec_enum ("orientation", NULL, NULL,
+ GIMP_TYPE_ORIENTATION_TYPE,
+ GIMP_ORIENTATION_HORIZONTAL,
+ GIMP_PARAM_READWRITE));
+
+ g_object_class_install_property (object_class, PROP_POSITION,
+ g_param_spec_int ("position", NULL, NULL,
+ -GIMP_MAX_IMAGE_SIZE,
+ GIMP_MAX_IMAGE_SIZE, 0,
+ GIMP_PARAM_READWRITE));
+
+ g_object_class_install_property (object_class, PROP_STYLE,
+ g_param_spec_enum ("style", NULL, NULL,
+ GIMP_TYPE_GUIDE_STYLE,
+ GIMP_GUIDE_STYLE_NONE,
+ GIMP_PARAM_READWRITE));
+}
+
+static void
+gimp_canvas_guide_init (GimpCanvasGuide *guide)
+{
+}
+
+static void
+gimp_canvas_guide_set_property (GObject *object,
+ guint property_id,
+ const GValue *value,
+ GParamSpec *pspec)
+{
+ GimpCanvasGuidePrivate *private = GET_PRIVATE (object);
+
+ switch (property_id)
+ {
+ case PROP_ORIENTATION:
+ private->orientation = g_value_get_enum (value);
+ break;
+ case PROP_POSITION:
+ private->position = g_value_get_int (value);
+ break;
+ case PROP_STYLE:
+ private->style = g_value_get_enum (value);
+ break;
+
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+ break;
+ }
+}
+
+static void
+gimp_canvas_guide_get_property (GObject *object,
+ guint property_id,
+ GValue *value,
+ GParamSpec *pspec)
+{
+ GimpCanvasGuidePrivate *private = GET_PRIVATE (object);
+
+ switch (property_id)
+ {
+ case PROP_ORIENTATION:
+ g_value_set_enum (value, private->orientation);
+ break;
+ case PROP_POSITION:
+ g_value_set_int (value, private->position);
+ break;
+ case PROP_STYLE:
+ g_value_set_enum (value, private->style);
+ break;
+
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+ break;
+ }
+}
+
+static void
+gimp_canvas_guide_transform (GimpCanvasItem *item,
+ gdouble *x1,
+ gdouble *y1,
+ gdouble *x2,
+ gdouble *y2)
+{
+ GimpCanvasGuidePrivate *private = GET_PRIVATE (item);
+ GtkWidget *canvas = gimp_canvas_item_get_canvas (item);
+ GtkAllocation allocation;
+ gint max_outside;
+ gint x, y;
+
+ gtk_widget_get_allocation (canvas, &allocation);
+
+ max_outside = allocation.width + allocation.height;
+
+ *x1 = -max_outside;
+ *y1 = -max_outside;
+ *x2 = allocation.width + max_outside;
+ *y2 = allocation.height + max_outside;
+
+ switch (private->orientation)
+ {
+ case GIMP_ORIENTATION_HORIZONTAL:
+ gimp_canvas_item_transform_xy (item, 0, private->position, &x, &y);
+ *y1 = *y2 = y + 0.5;
+ break;
+
+ case GIMP_ORIENTATION_VERTICAL:
+ gimp_canvas_item_transform_xy (item, private->position, 0, &x, &y);
+ *x1 = *x2 = x + 0.5;
+ break;
+
+ case GIMP_ORIENTATION_UNKNOWN:
+ return;
+ }
+}
+
+static void
+gimp_canvas_guide_draw (GimpCanvasItem *item,
+ cairo_t *cr)
+{
+ gdouble x1, y1;
+ gdouble x2, y2;
+
+ gimp_canvas_guide_transform (item, &x1, &y1, &x2, &y2);
+
+ cairo_move_to (cr, x1, y1);
+ cairo_line_to (cr, x2, y2);
+
+ _gimp_canvas_item_stroke (item, cr);
+}
+
+static cairo_region_t *
+gimp_canvas_guide_get_extents (GimpCanvasItem *item)
+{
+ cairo_rectangle_int_t rectangle;
+ gdouble x1, y1;
+ gdouble x2, y2;
+
+ gimp_canvas_guide_transform (item, &x1, &y1, &x2, &y2);
+
+ rectangle.x = MIN (x1, x2) - 1.5;
+ rectangle.y = MIN (y1, y2) - 1.5;
+ rectangle.width = ABS (x2 - x1) + 3.0;
+ rectangle.height = ABS (y2 - y1) + 3.0;
+
+ return cairo_region_create_rectangle (&rectangle);
+}
+
+static void
+gimp_canvas_guide_stroke (GimpCanvasItem *item,
+ cairo_t *cr)
+{
+ GimpCanvasGuidePrivate *private = GET_PRIVATE (item);
+
+ if (private->style != GIMP_GUIDE_STYLE_NONE)
+ {
+ GimpDisplayShell *shell = gimp_canvas_item_get_shell (item);
+
+ gimp_canvas_set_guide_style (gimp_canvas_item_get_canvas (item), cr,
+ private->style,
+ gimp_canvas_item_get_highlight (item),
+ shell->offset_x, shell->offset_y);
+ cairo_stroke (cr);
+ }
+ else
+ {
+ GIMP_CANVAS_ITEM_CLASS (parent_class)->stroke (item, cr);
+ }
+}
+
+GimpCanvasItem *
+gimp_canvas_guide_new (GimpDisplayShell *shell,
+ GimpOrientationType orientation,
+ gint position,
+ GimpGuideStyle style)
+{
+ g_return_val_if_fail (GIMP_IS_DISPLAY_SHELL (shell), NULL);
+
+ return g_object_new (GIMP_TYPE_CANVAS_GUIDE,
+ "shell", shell,
+ "orientation", orientation,
+ "position", position,
+ "style", style,
+ NULL);
+}
+
+void
+gimp_canvas_guide_set (GimpCanvasItem *guide,
+ GimpOrientationType orientation,
+ gint position)
+{
+ g_return_if_fail (GIMP_IS_CANVAS_GUIDE (guide));
+
+ gimp_canvas_item_begin_change (guide);
+
+ g_object_set (guide,
+ "orientation", orientation,
+ "position", position,
+ NULL);
+
+ gimp_canvas_item_end_change (guide);
+}
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