/* The GIMP -- an image manipulation program
 * Copyright (C) 1995 Spencer Kimball and Peter Mattis
 *
 * 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 2 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, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

#ifndef __HISTOGRAM_WIDGET_H__
#define __HISTOGRAM_WIDGET_H__


#include <gtk/gtkdrawingarea.h>


#define HISTOGRAM_WIDGET_TYPE         (histogram_widget_get_type ())
#define HISTOGRAM_WIDGET(obj)         G_TYPE_CHECK_INSTANCE_CAST (obj, histogram_widget_get_type (), HistogramWidget)
#define IS_HISTOGRAM_WIDGET(obj)      G_TYPE_CHECK_INSTANCE_TYPE (obj, histogram_widget_get_type ())
#define HISTOGRAM_WIDGET_CLASS(klass) G_TYPE_CHECK_CLASS_CAST (klass, histogram_widget_get_type (), HistogramWidget)


typedef struct _HistogramWidgetClass HistogramWidgetClass;

struct _HistogramWidget
{
  GtkDrawingArea        parent_instance;

  GimpHistogram        *histogram;
  GimpHistogramChannel  channel;
  gint                  start;
  gint                  end;
};

struct _HistogramWidgetClass
{
  GtkDrawingAreaClass  parent_class;

  void (* range_changed) (HistogramWidget *hw,
			  gint             start,
			  gint             end);
};


/*  Histogram functions  */

GtkType           histogram_widget_get_type  (void);

HistogramWidget * histogram_widget_new       (gint             width,
					      gint             height);
void              histogram_widget_update    (HistogramWidget *hw,
					      GimpHistogram   *histogram);
void              histogram_widget_range     (HistogramWidget *hw,
					      gint             start,
					      gint             end);
void              histogram_widget_channel   (HistogramWidget *hw,
					      gint             channel);
GimpHistogram   * histogram_widget_histogram (HistogramWidget *hw);


#endif /* __HISTOGRAM_WIDGET_H__ */