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gimp/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 <http://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"
#include "gimpdisplayshell-transform.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) \
G_TYPE_INSTANCE_GET_PRIVATE (line, \
GIMP_TYPE_CANVAS_LINE, \
GimpCanvasLinePrivate)
/* 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,
GimpDisplayShell *shell,
cairo_t *cr);
static cairo_region_t * gimp_canvas_line_get_extents (GimpCanvasItem *item,
GimpDisplayShell *shell);
G_DEFINE_TYPE (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));
g_type_class_add_private (klass, sizeof (GimpCanvasLinePrivate));
}
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,
GimpDisplayShell *shell,
gdouble *x1,
gdouble *y1,
gdouble *x2,
gdouble *y2)
{
GimpCanvasLinePrivate *private = GET_PRIVATE (item);
gimp_display_shell_transform_xy_f (shell,
private->x1, private->y1,
x1, y1);
gimp_display_shell_transform_xy_f (shell,
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,
GimpDisplayShell *shell,
cairo_t *cr)
{
gdouble x1, y1;
gdouble x2, y2;
gimp_canvas_line_transform (item, shell, &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,
GimpDisplayShell *shell)
{
GdkRectangle rectangle;
gdouble x1, y1;
gdouble x2, y2;
gimp_canvas_line_transform (item, shell, &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 ((cairo_rectangle_int_t *) &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);
}
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