ruler.h

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/*
 * Copyright (C) 2014 Paul Davis <paul@linuxaudiosystems.com>
 * Copyright (C) 2015-2017 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_RULER_H__
#define __CANVAS_RULER_H__
 
#include <string>
#include <vector>
 
#include <pangomm/fontdescription.h>
 
#include "canvas/rectangle.h"
 
namespace ArdourCanvas
{
 
class LIBCANVAS_API Ruler : public Rectangle
{
public:
        struct Mark {
                enum Style {
                        Major,
                        Minor,
                        Micro
                };
                std::string label;
                double position;
                Style  style;
        };
 
        struct Metric {
                Metric () : units_per_pixel (0) {}
                virtual ~Metric() {}
 
                double units_per_pixel;
 
                /* lower and upper and sample positions, which are also canvas coordinates
                 */
 
                virtual void get_marks (std::vector<Mark>&, int64_t lower, int64_t upper, int maxchars) const = 0;
        };
 
        Ruler (Canvas*, const Metric* m);
        Ruler (Canvas*, const Metric* m, Rect const&);
        Ruler (Item*, const Metric* m);
        Ruler (Item*, const Metric* m, Rect const&);
 
        virtual ~Ruler () {
                delete _font_description;
        }
 
        void set_range (int64_t lower, int64_t upper);
        void set_font_description (Pango::FontDescription);
        void set_metric (const Metric *);
 
        void render (Rect const & area, Cairo::RefPtr<Cairo::Context>) const;
 
        void set_divide_colors (Gtkmm2ext::Color top, Gtkmm2ext::Color bottom);
        void set_divide_height (double);
private:
        const Metric* _metric;
 
        /* lower and upper and bounds for ruler */
 
        int64_t            _lower;
        int64_t            _upper;
        double           _divide_height;
        Gtkmm2ext::Color _divider_color_top;
        Gtkmm2ext::Color _divider_color_bottom;
 
        Pango::FontDescription* _font_description;
        mutable std::vector<Mark> marks;
        mutable bool _need_marks;
};
 
}
 
 
#endif