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gimp/app/display/gimpcanvashandle.c

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/* GIMP - The GNU Image Manipulation Program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* gimpcanvashandle.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 "widgets/gimpcairo.h"
#include "gimpcanvashandle.h"
#include "gimpcanvasitem-utils.h"
#include "gimpdisplayshell.h"
#include "gimpdisplayshell-transform.h"
enum
{
PROP_0,
PROP_TYPE,
PROP_ANCHOR,
PROP_X,
PROP_Y,
PROP_WIDTH,
PROP_HEIGHT,
PROP_START_ANGLE,
PROP_SLICE_ANGLE
};
typedef struct _GimpCanvasHandlePrivate GimpCanvasHandlePrivate;
struct _GimpCanvasHandlePrivate
{
GimpHandleType type;
GimpHandleAnchor anchor;
gdouble x;
gdouble y;
gint width;
gint height;
gdouble start_angle;
gdouble slice_angle;;
};
#define GET_PRIVATE(handle) \
G_TYPE_INSTANCE_GET_PRIVATE (handle, \
GIMP_TYPE_CANVAS_HANDLE, \
GimpCanvasHandlePrivate)
/* local function prototypes */
static void gimp_canvas_handle_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec);
static void gimp_canvas_handle_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec);
static void gimp_canvas_handle_draw (GimpCanvasItem *item,
GimpDisplayShell *shell,
cairo_t *cr);
static cairo_region_t * gimp_canvas_handle_get_extents (GimpCanvasItem *item,
GimpDisplayShell *shell);
static gboolean gimp_canvas_handle_hit (GimpCanvasItem *item,
GimpDisplayShell *shell,
gdouble x,
gdouble y);
G_DEFINE_TYPE (GimpCanvasHandle, gimp_canvas_handle,
GIMP_TYPE_CANVAS_ITEM)
#define parent_class gimp_canvas_handle_parent_class
static void
gimp_canvas_handle_class_init (GimpCanvasHandleClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GimpCanvasItemClass *item_class = GIMP_CANVAS_ITEM_CLASS (klass);
object_class->set_property = gimp_canvas_handle_set_property;
object_class->get_property = gimp_canvas_handle_get_property;
item_class->draw = gimp_canvas_handle_draw;
item_class->get_extents = gimp_canvas_handle_get_extents;
item_class->hit = gimp_canvas_handle_hit;
g_object_class_install_property (object_class, PROP_TYPE,
g_param_spec_enum ("type", NULL, NULL,
GIMP_TYPE_HANDLE_TYPE,
GIMP_HANDLE_CROSS,
GIMP_PARAM_READWRITE));
g_object_class_install_property (object_class, PROP_ANCHOR,
g_param_spec_enum ("anchor", NULL, NULL,
GIMP_TYPE_HANDLE_ANCHOR,
GIMP_HANDLE_ANCHOR_CENTER,
GIMP_PARAM_READWRITE));
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_int ("width", NULL, NULL,
3, 1001, 7,
GIMP_PARAM_READWRITE));
g_object_class_install_property (object_class, PROP_HEIGHT,
g_param_spec_int ("height", NULL, NULL,
3, 1001, 7,
GIMP_PARAM_READWRITE));
g_object_class_install_property (object_class, PROP_START_ANGLE,
g_param_spec_double ("start-angle", NULL, NULL,
-1000, 1000, 0,
GIMP_PARAM_READWRITE));
g_object_class_install_property (object_class, PROP_SLICE_ANGLE,
g_param_spec_double ("slice-angle", NULL, NULL,
-1000, 1000, 2 * G_PI,
GIMP_PARAM_READWRITE));
g_type_class_add_private (klass, sizeof (GimpCanvasHandlePrivate));
}
static void
gimp_canvas_handle_init (GimpCanvasHandle *handle)
{
GimpCanvasHandlePrivate *private = GET_PRIVATE (handle);
gimp_canvas_item_set_line_cap (GIMP_CANVAS_ITEM (handle),
CAIRO_LINE_CAP_SQUARE);
private->start_angle = 0.0;
private->slice_angle = 2.0 * G_PI;
}
static void
gimp_canvas_handle_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec)
{
GimpCanvasHandlePrivate *private = GET_PRIVATE (object);
switch (property_id)
{
case PROP_TYPE:
private->type = g_value_get_enum (value);
break;
case PROP_ANCHOR:
private->anchor = g_value_get_enum (value);
break;
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_int (value);
break;
case PROP_HEIGHT:
private->height = g_value_get_int (value);
break;
case PROP_START_ANGLE:
private->start_angle = g_value_get_double (value);
break;
case PROP_SLICE_ANGLE:
private->slice_angle = g_value_get_double (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
gimp_canvas_handle_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec)
{
GimpCanvasHandlePrivate *private = GET_PRIVATE (object);
switch (property_id)
{
case PROP_TYPE:
g_value_set_enum (value, private->type);
break;
case PROP_ANCHOR:
g_value_set_enum (value, private->anchor);
break;
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_int (value, private->width);
break;
case PROP_HEIGHT:
g_value_set_int (value, private->height);
break;
case PROP_START_ANGLE:
g_value_set_double (value, private->start_angle);
break;
case PROP_SLICE_ANGLE:
g_value_set_double (value, private->slice_angle);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
gimp_canvas_handle_transform (GimpCanvasItem *item,
GimpDisplayShell *shell,
gdouble *x,
gdouble *y)
{
GimpCanvasHandlePrivate *private = GET_PRIVATE (item);
gimp_display_shell_transform_xy_f (shell,
private->x, private->y,
x, y);
switch (private->type)
{
case GIMP_HANDLE_SQUARE:
case GIMP_HANDLE_FILLED_SQUARE:
gimp_canvas_item_shift_to_north_west (private->anchor,
*x, *y,
private->width,
private->height,
x, y);
break;
case GIMP_HANDLE_CIRCLE:
case GIMP_HANDLE_FILLED_CIRCLE:
case GIMP_HANDLE_CROSS:
gimp_canvas_item_shift_to_center (private->anchor,
*x, *y,
private->width,
private->height,
x, y);
break;
default:
break;
}
*x = floor (*x) + 0.5;
*y = floor (*y) + 0.5;
}
static void
gimp_canvas_handle_draw (GimpCanvasItem *item,
GimpDisplayShell *shell,
cairo_t *cr)
{
GimpCanvasHandlePrivate *private = GET_PRIVATE (item);
gdouble x, y;
gimp_canvas_handle_transform (item, shell, &x, &y);
switch (private->type)
{
case GIMP_HANDLE_SQUARE:
cairo_rectangle (cr, x, y, private->width - 1.0, private->height - 1.0);
_gimp_canvas_item_stroke (item, cr);
break;
case GIMP_HANDLE_FILLED_SQUARE:
cairo_rectangle (cr, x - 0.5, y - 0.5, private->width, private->height);
_gimp_canvas_item_fill (item, cr);
break;
case GIMP_HANDLE_CIRCLE:
gimp_cairo_add_arc (cr, x, y, private->width / 2,
private->start_angle,
private->slice_angle);
_gimp_canvas_item_stroke (item, cr);
break;
case GIMP_HANDLE_FILLED_CIRCLE:
cairo_move_to (cr, x, y);
gimp_cairo_add_arc (cr, x, y, (gdouble) private->width / 2.0,
private->start_angle,
private->slice_angle);
_gimp_canvas_item_fill (item, cr);
break;
case GIMP_HANDLE_CROSS:
cairo_move_to (cr, x - private->width / 2, y);
cairo_line_to (cr, x + private->width / 2, y);
cairo_move_to (cr, x, y - private->height / 2);
cairo_line_to (cr, x, y + private->height / 2);
_gimp_canvas_item_stroke (item, cr);
break;
default:
break;
}
}
static cairo_region_t *
gimp_canvas_handle_get_extents (GimpCanvasItem *item,
GimpDisplayShell *shell)
{
GimpCanvasHandlePrivate *private = GET_PRIVATE (item);
cairo_rectangle_int_t rectangle;
gdouble x, y;
gimp_canvas_handle_transform (item, shell, &x, &y);
switch (private->type)
{
case GIMP_HANDLE_SQUARE:
case GIMP_HANDLE_FILLED_SQUARE:
rectangle.x = x - 1.5;
rectangle.y = y - 1.5;
rectangle.width = private->width + 3.0;
rectangle.height = private->height + 3.0;
break;
case GIMP_HANDLE_CIRCLE:
case GIMP_HANDLE_FILLED_CIRCLE:
case GIMP_HANDLE_CROSS:
rectangle.x = x - private->width / 2 - 1.5;
rectangle.y = y - private->height / 2 - 1.5;
rectangle.width = private->width + 3.0;
rectangle.height = private->height + 3.0;
break;
default:
break;
}
return cairo_region_create_rectangle (&rectangle);
}
static gboolean
gimp_canvas_handle_hit (GimpCanvasItem *item,
GimpDisplayShell *shell,
gdouble x,
gdouble y)
{
GimpCanvasHandlePrivate *private = GET_PRIVATE (item);
gdouble handle_tx, handle_ty;
gdouble tx, ty;
gimp_canvas_handle_transform (item, shell, &handle_tx, &handle_ty);
gimp_display_shell_transform_xy_f (shell,
x, y,
&tx, &ty);
switch (private->type)
{
case GIMP_HANDLE_SQUARE:
case GIMP_HANDLE_FILLED_SQUARE:
return (tx == CLAMP (tx, handle_tx, handle_tx + private->width) &&
ty == CLAMP (ty, handle_ty, handle_ty + private->height));
case GIMP_HANDLE_CIRCLE:
case GIMP_HANDLE_FILLED_CIRCLE:
case GIMP_HANDLE_CROSS:
{
gint width = private->width;
if (width != private->height)
width = (width + private->height) / 2;
width /= 2;
return ((SQR (handle_tx - tx) + SQR (handle_ty - ty)) < SQR (width));
}
default:
break;
}
return FALSE;
}
GimpCanvasItem *
gimp_canvas_handle_new (GimpDisplayShell *shell,
GimpHandleType type,
GimpHandleAnchor anchor,
gdouble x,
gdouble y,
gint width,
gint height)
{
g_return_val_if_fail (GIMP_IS_DISPLAY_SHELL (shell), NULL);
return g_object_new (GIMP_TYPE_CANVAS_HANDLE,
"shell", shell,
"type", type,
"anchor", anchor,
"x", x,
"y", y,
"width", width,
"height", height,
NULL);
}
void
gimp_canvas_handle_set_position (GimpCanvasItem *handle,
gdouble x,
gdouble y)
{
g_return_if_fail (GIMP_IS_CANVAS_HANDLE (handle));
gimp_canvas_item_begin_change (handle);
g_object_set (handle,
"x", x,
"y", y,
NULL);
gimp_canvas_item_end_change (handle);
}
void
gimp_canvas_handle_set_angles (GimpCanvasItem *handle,
gdouble start_angle,
gdouble slice_angle)
{
g_return_if_fail (GIMP_IS_CANVAS_HANDLE (handle));
gimp_canvas_item_begin_change (handle);
g_object_set (handle,
"start-angle", start_angle,
"slice-angle", slice_angle,
NULL);
gimp_canvas_item_end_change (handle);
}
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