poly_item.h

Go to the documentation of this file.

/*
 * Copyright (C) 2012 Carl Hetherington <carl@carlh.net>
 * Copyright (C) 2013-2014 Paul Davis <paul@linuxaudiosystems.com>
 * Copyright (C) 2015-2016 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_POLY_ITEM_H__
#define __CANVAS_POLY_ITEM_H__
 
#include "canvas/item.h"
#include "canvas/outline.h"
#include "canvas/visibility.h"
 
namespace ArdourCanvas {
 
class LIBCANVAS_API PolyItem : public Item
{
public:
        PolyItem (Canvas*);
        PolyItem (Item*);
 
        virtual void compute_bounding_box () const;
 
        virtual void  set (Points const&);
        virtual void  add_point (Duple const &);
        virtual void  clear ();
        void pop_back();
        Points const& get () const;
 
        void dump (std::ostream&) const;
 
protected:
        void render_path (Rect const&, Cairo::RefPtr<Cairo::Context>) const;
 
        Points _points;
 
        /* these return screen-cordidates of the most recent render_path() */
        Duple const& left_edge ()  const { return _left; }
        Duple const& right_edge () const { return _right; }
 
private:
        static bool interpolate_line (Duple&, Duple const&, Coord const);
 
        mutable Duple _left;
        mutable Duple _right;
};
 
}
 
#endif