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-rw-r--r--app/display/gimpcanvasline.c281
1 files changed, 281 insertions, 0 deletions
diff --git a/app/display/gimpcanvasline.c b/app/display/gimpcanvasline.c
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+++ b/app/display/gimpcanvasline.c
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+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpcanvasline.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 "gimpcanvasline.h"
+#include "gimpdisplayshell.h"
+
+
+enum
+{
+ PROP_0,
+ PROP_X1,
+ PROP_Y1,
+ PROP_X2,
+ PROP_Y2
+};
+
+
+typedef struct _GimpCanvasLinePrivate GimpCanvasLinePrivate;
+
+struct _GimpCanvasLinePrivate
+{
+ gdouble x1;
+ gdouble y1;
+ gdouble x2;
+ gdouble y2;
+};
+
+#define GET_PRIVATE(line) \
+ ((GimpCanvasLinePrivate *) gimp_canvas_line_get_instance_private ((GimpCanvasLine *) (line)))
+
+
+/* local function prototypes */
+
+static void gimp_canvas_line_set_property (GObject *object,
+ guint property_id,
+ const GValue *value,
+ GParamSpec *pspec);
+static void gimp_canvas_line_get_property (GObject *object,
+ guint property_id,
+ GValue *value,
+ GParamSpec *pspec);
+static void gimp_canvas_line_draw (GimpCanvasItem *item,
+ cairo_t *cr);
+static cairo_region_t * gimp_canvas_line_get_extents (GimpCanvasItem *item);
+
+
+G_DEFINE_TYPE_WITH_PRIVATE (GimpCanvasLine, gimp_canvas_line,
+ GIMP_TYPE_CANVAS_ITEM)
+
+#define parent_class gimp_canvas_line_parent_class
+
+
+static void
+gimp_canvas_line_class_init (GimpCanvasLineClass *klass)
+{
+ GObjectClass *object_class = G_OBJECT_CLASS (klass);
+ GimpCanvasItemClass *item_class = GIMP_CANVAS_ITEM_CLASS (klass);
+
+ object_class->set_property = gimp_canvas_line_set_property;
+ object_class->get_property = gimp_canvas_line_get_property;
+
+ item_class->draw = gimp_canvas_line_draw;
+ item_class->get_extents = gimp_canvas_line_get_extents;
+
+ g_object_class_install_property (object_class, PROP_X1,
+ g_param_spec_double ("x1", NULL, NULL,
+ -GIMP_MAX_IMAGE_SIZE,
+ GIMP_MAX_IMAGE_SIZE, 0,
+ GIMP_PARAM_READWRITE));
+
+ g_object_class_install_property (object_class, PROP_Y1,
+ g_param_spec_double ("y1", NULL, NULL,
+ -GIMP_MAX_IMAGE_SIZE,
+ GIMP_MAX_IMAGE_SIZE, 0,
+ GIMP_PARAM_READWRITE));
+
+ g_object_class_install_property (object_class, PROP_X2,
+ g_param_spec_double ("x2", NULL, NULL,
+ -GIMP_MAX_IMAGE_SIZE,
+ GIMP_MAX_IMAGE_SIZE, 0,
+ GIMP_PARAM_READWRITE));
+
+ g_object_class_install_property (object_class, PROP_Y2,
+ g_param_spec_double ("y2", NULL, NULL,
+ -GIMP_MAX_IMAGE_SIZE,
+ GIMP_MAX_IMAGE_SIZE, 0,
+ GIMP_PARAM_READWRITE));
+}
+
+static void
+gimp_canvas_line_init (GimpCanvasLine *line)
+{
+}
+
+static void
+gimp_canvas_line_set_property (GObject *object,
+ guint property_id,
+ const GValue *value,
+ GParamSpec *pspec)
+{
+ GimpCanvasLinePrivate *private = GET_PRIVATE (object);
+
+ switch (property_id)
+ {
+ case PROP_X1:
+ private->x1 = g_value_get_double (value);
+ break;
+ case PROP_Y1:
+ private->y1 = g_value_get_double (value);
+ break;
+ case PROP_X2:
+ private->x2 = g_value_get_double (value);
+ break;
+ case PROP_Y2:
+ private->y2 = g_value_get_double (value);
+ break;
+
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+ break;
+ }
+}
+
+static void
+gimp_canvas_line_get_property (GObject *object,
+ guint property_id,
+ GValue *value,
+ GParamSpec *pspec)
+{
+ GimpCanvasLinePrivate *private = GET_PRIVATE (object);
+
+ switch (property_id)
+ {
+ case PROP_X1:
+ g_value_set_double (value, private->x1);
+ break;
+ case PROP_Y1:
+ g_value_set_double (value, private->y1);
+ break;
+ case PROP_X2:
+ g_value_set_double (value, private->x2);
+ break;
+ case PROP_Y2:
+ g_value_set_double (value, private->y2);
+ break;
+
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+ break;
+ }
+}
+
+static void
+gimp_canvas_line_transform (GimpCanvasItem *item,
+ gdouble *x1,
+ gdouble *y1,
+ gdouble *x2,
+ gdouble *y2)
+{
+ GimpCanvasLinePrivate *private = GET_PRIVATE (item);
+
+ gimp_canvas_item_transform_xy_f (item,
+ private->x1, private->y1,
+ x1, y1);
+ gimp_canvas_item_transform_xy_f (item,
+ private->x2, private->y2,
+ x2, y2);
+
+ *x1 = floor (*x1) + 0.5;
+ *y1 = floor (*y1) + 0.5;
+ *x2 = floor (*x2) + 0.5;
+ *y2 = floor (*y2) + 0.5;
+}
+
+static void
+gimp_canvas_line_draw (GimpCanvasItem *item,
+ cairo_t *cr)
+{
+ gdouble x1, y1;
+ gdouble x2, y2;
+
+ gimp_canvas_line_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_line_get_extents (GimpCanvasItem *item)
+{
+ cairo_rectangle_int_t rectangle;
+ gdouble x1, y1;
+ gdouble x2, y2;
+
+ gimp_canvas_line_transform (item, &x1, &y1, &x2, &y2);
+
+ if (x1 == x2 || y1 == 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;
+ }
+ else
+ {
+ rectangle.x = floor (MIN (x1, x2) - 2.5);
+ rectangle.y = floor (MIN (y1, y2) - 2.5);
+ rectangle.width = ceil (ABS (x2 - x1) + 5.0);
+ rectangle.height = ceil (ABS (y2 - y1) + 5.0);
+ }
+
+ return cairo_region_create_rectangle (&rectangle);
+}
+
+GimpCanvasItem *
+gimp_canvas_line_new (GimpDisplayShell *shell,
+ gdouble x1,
+ gdouble y1,
+ gdouble x2,
+ gdouble y2)
+{
+ g_return_val_if_fail (GIMP_IS_DISPLAY_SHELL (shell), NULL);
+
+ return g_object_new (GIMP_TYPE_CANVAS_LINE,
+ "shell", shell,
+ "x1", x1,
+ "y1", y1,
+ "x2", x2,
+ "y2", y2,
+ NULL);
+}
+
+void
+gimp_canvas_line_set (GimpCanvasItem *line,
+ gdouble x1,
+ gdouble y1,
+ gdouble x2,
+ gdouble y2)
+{
+ g_return_if_fail (GIMP_IS_CANVAS_LINE (line));
+
+ gimp_canvas_item_begin_change (line);
+
+ g_object_set (line,
+ "x1", x1,
+ "y1", y1,
+ "x2", x2,
+ "y2", y2,
+ NULL);
+
+ gimp_canvas_item_end_change (line);
+}
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