diff options
Diffstat (limited to 'app/display/gimpcanvascursor.c')
| -rw-r--r-- | app/display/gimpcanvascursor.c | 228 |
1 files changed, 228 insertions, 0 deletions
diff --git a/app/display/gimpcanvascursor.c b/app/display/gimpcanvascursor.c new file mode 100644 index 0000000..581fa76 --- /dev/null +++ b/app/display/gimpcanvascursor.c @@ -0,0 +1,228 @@ +/* GIMP - The GNU Image Manipulation Program + * Copyright (C) 1995 Spencer Kimball and Peter Mattis + * + * gimpcanvascursor.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 "core/gimp-cairo.h" + +#include "gimpcanvascursor.h" +#include "gimpdisplayshell.h" + + +#define GIMP_CURSOR_SIZE 7 + + +enum +{ + PROP_0, + PROP_X, + PROP_Y +}; + + +typedef struct _GimpCanvasCursorPrivate GimpCanvasCursorPrivate; + +struct _GimpCanvasCursorPrivate +{ + gdouble x; + gdouble y; +}; + +#define GET_PRIVATE(cursor) \ + ((GimpCanvasCursorPrivate *) gimp_canvas_cursor_get_instance_private ((GimpCanvasCursor *) (cursor))) + + +/* local function prototypes */ + +static void gimp_canvas_cursor_set_property (GObject *object, + guint property_id, + const GValue *value, + GParamSpec *pspec); +static void gimp_canvas_cursor_get_property (GObject *object, + guint property_id, + GValue *value, + GParamSpec *pspec); +static void gimp_canvas_cursor_draw (GimpCanvasItem *item, + cairo_t *cr); +static cairo_region_t * gimp_canvas_cursor_get_extents (GimpCanvasItem *item); + + +G_DEFINE_TYPE_WITH_PRIVATE (GimpCanvasCursor, gimp_canvas_cursor, + GIMP_TYPE_CANVAS_ITEM) + +#define parent_class gimp_canvas_cursor_parent_class + + +static void +gimp_canvas_cursor_class_init (GimpCanvasCursorClass *klass) +{ + GObjectClass *object_class = G_OBJECT_CLASS (klass); + GimpCanvasItemClass *item_class = GIMP_CANVAS_ITEM_CLASS (klass); + + object_class->set_property = gimp_canvas_cursor_set_property; + object_class->get_property = gimp_canvas_cursor_get_property; + + item_class->draw = gimp_canvas_cursor_draw; + item_class->get_extents = gimp_canvas_cursor_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)); +} + +static void +gimp_canvas_cursor_init (GimpCanvasCursor *cursor) +{ + gimp_canvas_item_set_line_cap (GIMP_CANVAS_ITEM (cursor), + CAIRO_LINE_CAP_SQUARE); +} + +static void +gimp_canvas_cursor_set_property (GObject *object, + guint property_id, + const GValue *value, + GParamSpec *pspec) +{ + GimpCanvasCursorPrivate *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; + + default: + G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec); + break; + } +} + +static void +gimp_canvas_cursor_get_property (GObject *object, + guint property_id, + GValue *value, + GParamSpec *pspec) +{ + GimpCanvasCursorPrivate *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; + + default: + G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec); + break; + } +} + +static void +gimp_canvas_cursor_draw (GimpCanvasItem *item, + cairo_t *cr) +{ + GimpCanvasCursorPrivate *private = GET_PRIVATE (item); + gdouble x, y; + + x = floor (private->x) + 0.5; + y = floor (private->y) + 0.5; + + cairo_move_to (cr, x - GIMP_CURSOR_SIZE, y); + cairo_line_to (cr, x + GIMP_CURSOR_SIZE, y); + + cairo_move_to (cr, x, y - GIMP_CURSOR_SIZE); + cairo_line_to (cr, x, y + GIMP_CURSOR_SIZE); + + _gimp_canvas_item_stroke (item, cr); +} + +static cairo_region_t * +gimp_canvas_cursor_get_extents (GimpCanvasItem *item) +{ + GimpCanvasCursorPrivate *private = GET_PRIVATE (item); + cairo_rectangle_int_t rectangle; + gdouble x, y; + + x = floor (private->x) + 0.5; + y = floor (private->y) + 0.5; + + rectangle.x = floor (x - GIMP_CURSOR_SIZE - 1.5); + rectangle.y = floor (y - GIMP_CURSOR_SIZE - 1.5); + rectangle.width = ceil (x + GIMP_CURSOR_SIZE + 1.5) - rectangle.x; + rectangle.height = ceil (y + GIMP_CURSOR_SIZE + 1.5) - rectangle.y; + + return cairo_region_create_rectangle (&rectangle); +} + +GimpCanvasItem * +gimp_canvas_cursor_new (GimpDisplayShell *shell) +{ + g_return_val_if_fail (GIMP_IS_DISPLAY_SHELL (shell), NULL); + + return g_object_new (GIMP_TYPE_CANVAS_CURSOR, + "shell", shell, + NULL); +} + +void +gimp_canvas_cursor_set (GimpCanvasItem *cursor, + gdouble x, + gdouble y) +{ + GimpCanvasCursorPrivate *private; + + g_return_if_fail (GIMP_IS_CANVAS_CURSOR (cursor)); + + private = GET_PRIVATE (cursor); + + if (private->x != x || private->y != y) + { + gimp_canvas_item_begin_change (cursor); + + g_object_set (cursor, + "x", x, + "y", y, + NULL); + + gimp_canvas_item_end_change (cursor); + } +} |