path: root/libgnomecanvas/gnome-canvas-rect.c

/*
 * Copyright (C) 1997, 1998, 1999, 2000 Free Software Foundation
 * All rights reserved.
 *
 * This file is part of the Gnome Library.
 *
 * The Gnome Library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version.
 *
 * The Gnome Library 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
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with the Gnome Library; see the file COPYING.LIB.  If not,
 * write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */
/*
  @NOTATION@
 */
/* Rectangle and ellipse item types for GnomeCanvas widget
 *
 * GnomeCanvas is basically a port of the Tk toolkit's most excellent canvas widget.  Tk is
 * copyrighted by the Regents of the University of California, Sun Microsystems, and other parties.
 *
 *
 * Authors: Federico Mena <federico@nuclecu.unam.mx>
 *          Rusty Conover <rconover@bangtail.net>
 */

#include <config.h>
#include <math.h>
#include "gnome-canvas-rect.h"
#include "gnome-canvas-util.h"
#include "gnome-canvas-shape.h"

/* Base class for rectangle and ellipse item types */

#define noVERBOSE

enum {
    PROP_0,
    PROP_X1,
    PROP_Y1,
    PROP_X2,
    PROP_Y2
};

static void gnome_canvas_rect_set_property (GObject              *object,
                                            guint                 param_id,
                                            const GValue         *value,
                                            GParamSpec           *pspec);
static void gnome_canvas_rect_get_property (GObject              *object,
                                            guint                 param_id,
                                            GValue               *value,
                                            GParamSpec           *pspec);

static void gnome_canvas_rect_update       (GnomeCanvasItem *item, const cairo_matrix_t *matrix, gint flags);

G_DEFINE_TYPE(GnomeCanvasRect, gnome_canvas_rect, GNOME_TYPE_CANVAS_SHAPE)

static void
gnome_canvas_rect_class_init (GnomeCanvasRectClass *class)
{
    GObjectClass *gobject_class;
        GnomeCanvasItemClass *item_class;

    gobject_class = (GObjectClass *) class;

    gobject_class->set_property = gnome_canvas_rect_set_property;
    gobject_class->get_property = gnome_canvas_rect_get_property;

        g_object_class_install_property
                (gobject_class,
                 PROP_X1,
                 g_param_spec_double ("x1", NULL, NULL,
                      -G_MAXDOUBLE, G_MAXDOUBLE, 0,
                      (G_PARAM_READABLE | G_PARAM_WRITABLE)));
        g_object_class_install_property
                (gobject_class,
                 PROP_Y1,
                 g_param_spec_double ("y1", NULL, NULL,
                      -G_MAXDOUBLE, G_MAXDOUBLE, 0,
                      (G_PARAM_READABLE | G_PARAM_WRITABLE)));
        g_object_class_install_property
                (gobject_class,
                 PROP_X2,
                 g_param_spec_double ("x2", NULL, NULL,
                      -G_MAXDOUBLE, G_MAXDOUBLE, 0,
                      (G_PARAM_READABLE | G_PARAM_WRITABLE)));
        g_object_class_install_property
                (gobject_class,
                 PROP_Y2,
                 g_param_spec_double ("y2", NULL, NULL,
                      -G_MAXDOUBLE, G_MAXDOUBLE, 0,
                      (G_PARAM_READABLE | G_PARAM_WRITABLE)));

    item_class = (GnomeCanvasItemClass *) class;

    item_class->update = gnome_canvas_rect_update;
}

static void
gnome_canvas_rect_init (GnomeCanvasRect *rect)
{
    rect->x1 = 0.0;
    rect->y1 = 0.0;
    rect->x2 = 0.0;
    rect->y2 = 0.0;
    rect->path_dirty = 0;
}

static void
gnome_canvas_rect_set_property (GObject              *object,
                                guint                 param_id,
                                const GValue         *value,
                                GParamSpec           *pspec)
{
    GnomeCanvasItem *item;
    GnomeCanvasRect *rect;

    g_return_if_fail (object != NULL);
    g_return_if_fail (GNOME_IS_CANVAS_RECT (object));

    item = GNOME_CANVAS_ITEM (object);
    rect = GNOME_CANVAS_RECT (object);

    switch (param_id) {
    case PROP_X1:
        rect->x1 = g_value_get_double (value);
        rect->path_dirty = 1;
        gnome_canvas_item_request_update (item);
        break;

    case PROP_Y1:
        rect->y1 = g_value_get_double (value);
        rect->path_dirty = 1;
        gnome_canvas_item_request_update (item);
        break;

    case PROP_X2:
        rect->x2 = g_value_get_double (value);
        rect->path_dirty = 1;
        gnome_canvas_item_request_update (item);
        break;

    case PROP_Y2:
        rect->y2 = g_value_get_double (value);
        rect->path_dirty = 1;
        gnome_canvas_item_request_update (item);
        break;

    default:
        G_OBJECT_WARN_INVALID_PROPERTY_ID (object, param_id, pspec);
        break;
    }
}

static void
gnome_canvas_rect_get_property (GObject              *object,
                                guint                 param_id,
                                GValue               *value,
                                GParamSpec           *pspec)
{
    GnomeCanvasRect *rect;

    g_return_if_fail (object != NULL);
    g_return_if_fail (GNOME_IS_CANVAS_RECT (object));

    rect = GNOME_CANVAS_RECT (object);

    switch (param_id) {
    case PROP_X1:
        g_value_set_double (value,  rect->x1);
        break;

    case PROP_Y1:
        g_value_set_double (value,  rect->y1);
        break;

    case PROP_X2:
        g_value_set_double (value,  rect->x2);
        break;

    case PROP_Y2:
        g_value_set_double (value,  rect->y2);
        break;

    default:
        G_OBJECT_WARN_INVALID_PROPERTY_ID (object, param_id, pspec);
        break;
    }
}

static void
gnome_canvas_rect_update (GnomeCanvasItem *item, const cairo_matrix_t *matrix, gint flags)
{
        GnomeCanvasRect *rect = GNOME_CANVAS_RECT (item);

    if (rect->path_dirty) {
                cairo_t *cr;

                cr = gnome_canvas_cairo_create_scratch ();

                cairo_rectangle (cr,
                                 rect->x1, rect->y1,
                                 rect->x2 - rect->x1,
                                 rect->y2 - rect->y1);

        gnome_canvas_shape_set_path (GNOME_CANVAS_SHAPE (item),
                                             cairo_copy_path (cr));
                
                cairo_destroy (cr);

        rect->path_dirty = 0;
    }

    if (GNOME_CANVAS_ITEM_CLASS (gnome_canvas_rect_parent_class)->update)
        GNOME_CANVAS_ITEM_CLASS (gnome_canvas_rect_parent_class)->update (item, matrix, flags);
}