#ifndef _XS_CURVE_H
#define _XS_CURVE_H

#include <gdk/gdk.h>
#include <gtk/gtkdrawingarea.h>

#ifdef __cplusplus
extern "C" {
#endif


#define XS_TYPE_CURVE			(xs_curve_get_type())
#define XS_CURVE(obj)			(GTK_CHECK_CAST ((obj), XS_TYPE_CURVE, XSCurve))
#define XS_CURVE_CLASS(luokka)		(GTK_CHECK_CLASS_CAST ((luokka), XS_TYPE_CURVE, XSCurveClass))
#define XS_IS_CURVE(obj)		(GTK_CHECK_TYPE ((obj), XS_TYPE_CURVE))
#define XS_IS_CURVE_CLASS(luokka)	(GTK_CHECK_CLASS_TYPE ((luokka), XS_TYPE_CURVE))


typedef struct _XSCurve	XSCurve;
typedef struct _XSCurveClass	XSCurveClass;


struct _XSCurve
{
	GtkDrawingArea graph;

	gfloat min_x;
	gfloat max_x;
	gfloat min_y;
	gfloat max_y;
	GdkPixmap *pixmap;
	gint height;                  /* (cached) graph height in pixels */
	gint grab_point;              /* point currently grabbed */
	gint last;

	/* (cached) curve points: */
	gint num_points;
	GdkPoint *point;

	/* control points: */
	gint num_ctlpoints;           /* number of control points */
	gfloat (*ctlpoint)[2];        /* array of control points */
};

struct _XSCurveClass
{
	GtkDrawingAreaClass parent_class;
};


GtkType		xs_curve_get_type	(void);
GtkWidget*	xs_curve_new		(void);
void		xs_curve_reset		(XSCurve *curve);
void		xs_curve_set_gamma	(XSCurve *curve, gfloat gamma);
void		xs_curve_set_range	(XSCurve *curve,
					 gfloat min_x, gfloat max_x,
					 gfloat min_y, gfloat max_y);
void		xs_curve_get_vector	(XSCurve *curve,
					 int veclen, gfloat vector[]);
void		xs_curve_set_vector	(XSCurve *curve,
					 int veclen, gfloat vector[]);


#ifdef __cplusplus
}
#endif

#endif /* _XS_CURVE_H */