curve.h

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/*
 * Copyright (C) 2013-2014 Paul Davis <paul@linuxaudiosystems.com>
 * Copyright (C) 2014 Robin Gareus <robin@gareus.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 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.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */
 
#ifndef __CANVAS_CURVE_H__
#define __CANVAS_CURVE_H__
 
#include "canvas/visibility.h"
 
#include "canvas/interpolated_curve.h"
#include "canvas/poly_item.h"
#include "canvas/fill.h"
 
namespace ArdourCanvas {
 
class XFadeCurve;
 
class LIBCANVAS_API Curve : public PolyItem, public InterpolatedCurve
{
  public:
    Curve (Canvas*);
    Curve (Item*);
 
    enum CurveFill {
            None,
            Inside,
            Outside,
    };
 
    void compute_bounding_box () const;
    void render (Rect const & area, Cairo::RefPtr<Cairo::Context>) const;
    void set (Points const &);
 
    void set_points_per_segment (uint32_t n);
 
    bool covers (Duple const &) const;
    void set_fill_mode (CurveFill cf) { curve_fill = cf; }
 
  private:
    Points samples;
    Points::size_type n_samples;
    uint32_t points_per_segment;
    CurveFill curve_fill;
 
    void interpolate ();
};
 
}
 
#endif