src/display/gnome-canvas-acetate.cpp

	gnome-canvas-acetate.cpp revision 9959e60a4dc569885f320537414629047cba9471
/*
 * Infinite invisible canvas item
 *
 * Author:
 *   Federico Mena <federico@nuclecu.unam.mx>
 *   Raph Levien <raph@acm.org>
 *   Lauris Kaplinski <lauris@kaplinski.com>
 *   Jon A. Cruz <jon@joncruz.org>
 *
 * Copyright (C) 1998-1999 The Free Software Foundation
 * Copyright (C) 2002 Lauris Kaplinski
 *
 * Released under GNU GPL, read the file 'COPYING' for more information
 */

#include "gnome-canvas-acetate.h"

static void sp_canvas_acetate_class_init (SPCanvasAcetateClass *klass);
static void sp_canvas_acetate_init (SPCanvasAcetate *acetate);
static void sp_canvas_acetate_destroy (GtkObject *object);

static void sp_canvas_acetate_update (SPCanvasItem *item, Geom::Affine const &affine, unsigned int flags);
static double sp_canvas_acetate_point (SPCanvasItem *item, Geom::Point p, SPCanvasItem **actual_item);

static SPCanvasItemClass *parent_class;

GType sp_canvas_acetate_get_type (void)
{
    static GType acetate_type = 0;
    if (!acetate_type) {
        GTypeInfo acetate_info = {
            sizeof (SPCanvasAcetateClass),
            NULL, NULL,
            (GClassInitFunc) sp_canvas_acetate_class_init,
            NULL, NULL,
            sizeof (SPCanvasAcetate),
            0,
            (GInstanceInitFunc) sp_canvas_acetate_init,
            NULL
        };
        acetate_type = g_type_register_static(SPCanvasItem::getType(), "SPCanvasAcetate", &acetate_info, GTypeFlags(0));
    }
    return acetate_type;
}

static void sp_canvas_acetate_class_init (SPCanvasAcetateClass *klass)
{
    GtkObjectClass *object_class;
    SPCanvasItemClass *item_class;

    object_class = (GtkObjectClass *) klass;
    item_class = (SPCanvasItemClass *) klass;

    parent_class = (SPCanvasItemClass*)g_type_class_peek_parent (klass);

    object_class->destroy = sp_canvas_acetate_destroy;

    item_class->update = sp_canvas_acetate_update;
    item_class->point = sp_canvas_acetate_point;
}

static void sp_canvas_acetate_init (SPCanvasAcetate */*acetate*/)
{
    /* Nothing here */
}

static void sp_canvas_acetate_destroy (GtkObject *object)
{
    g_return_if_fail (object != NULL);
    g_return_if_fail (GNOME_IS_CANVAS_ACETATE (object));

    if (GTK_OBJECT_CLASS (parent_class)->destroy)
        (* GTK_OBJECT_CLASS (parent_class)->destroy) (object);
}

static void sp_canvas_acetate_update( SPCanvasItem *item, Geom::Affine const &/*affine*/, unsigned int /*flags*/ )
{
    item->x1 = -G_MAXINT;
    item->y1 = -G_MAXINT;
    item->x2 = G_MAXINT;
    item->y2 = G_MAXINT;
}

static double sp_canvas_acetate_point( SPCanvasItem *item, Geom::Point /*p*/, SPCanvasItem **actual_item )
{
    *actual_item = item;

    return 0.0;
}