91 lines
2.3 KiB
C++
91 lines
2.3 KiB
C++
/*
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Copyright (C) 2013 Paul Davis
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Copyright (C) 2014 Robin Gareus <robin@gareus.org>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#ifndef __CANVAS_XFADECURVE_H__
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#define __CANVAS_XFADECURVE_H__
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#include "canvas/visibility.h"
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#include "canvas/item.h"
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#include "canvas/curve.h"
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namespace ArdourCanvas {
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class LIBCANVAS_API XFadeCurve : public Item, public InterpolatedCurve
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{
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public:
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enum XFadePosition {
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Start,
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End,
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};
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XFadeCurve (Canvas *);
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XFadeCurve (Canvas *, XFadePosition);
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XFadeCurve (Item*);
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XFadeCurve (Item*, XFadePosition);
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void set_fade_position (XFadePosition xfp) { _xfadeposition = xfp; }
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void set_show_background_fade (bool show) { show_background_fade = show; }
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void compute_bounding_box () const;
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void render (Rect const & area, Cairo::RefPtr<Cairo::Context>) const;
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void set_points_per_segment (uint32_t n);
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void set_inout (Points const & in, Points const & out);
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void set_outline_color (Color c) {
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begin_visual_change ();
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_outline_color = c;
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end_visual_change ();
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};
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void set_fill_color (Color c) {
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begin_visual_change ();
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_fill_color = c;
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end_visual_change ();
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}
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private:
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struct CanvasCurve {
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CanvasCurve() : n_samples(0) { }
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Points points;
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Points samples;
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Points::size_type n_samples;
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};
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Cairo::Path * get_path(Rect const &, Cairo::RefPtr<Cairo::Context>, CanvasCurve const &) const;
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void close_path(Rect const &, Cairo::RefPtr<Cairo::Context>, CanvasCurve const &p, bool) const;
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uint32_t points_per_segment;
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CanvasCurve _in;
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CanvasCurve _out;
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XFadePosition _xfadeposition;
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Color _outline_color;
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Color _fill_color;
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bool show_background_fade;
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void interpolate ();
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};
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}
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#endif
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