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Canvas: new x-fade drawing, two curve widget

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Robin Gareus 2014-05-29 03:09:57 +02:00
parent f226ed086b
commit 30f204b90e
6 changed files with 593 additions and 208 deletions
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84
libs/canvas/canvas/xfade_curve.h Normal file
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/*
Copyright (C) 2013 Paul Davis
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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifndef __CANVAS_XFADECURVE_H__
#define __CANVAS_XFADECURVE_H__
#include "canvas/visibility.h"
#include "canvas/curve.h"
namespace ArdourCanvas {
class LIBCANVAS_API XFadeCurve : public Item, public InterpolatedCurve
{
public:
enum XFadePosition {
Start,
End,
};
XFadeCurve (Group *);
XFadeCurve (Group *, XFadePosition);
void set_fade_position (XFadePosition xfp) { _xfadeposition = xfp; }
void compute_bounding_box () const;
void render (Rect const & area, Cairo::RefPtr<Cairo::Context>) const;
void set_points_per_segment (uint32_t n);
void set_inout (Points const & in, Points const & out);
void set_outline_color (Color c) {
begin_visual_change ();
_outline_color = c;
end_visual_change ();
};
void set_fill_color (Color c) {
begin_visual_change ();
_fill_color = c;
end_visual_change ();
}
private:
struct CanvasCurve {
CanvasCurve() : n_samples(0) { }
Points points;
Points samples;
Points::size_type n_samples;
};
Cairo::Path * get_path(Rect const &, Cairo::RefPtr<Cairo::Context>, CanvasCurve const &) const;
void close_path(Rect const &, Cairo::RefPtr<Cairo::Context>, CanvasCurve const &p, bool) const;
uint32_t points_per_segment;
CanvasCurve _in;
CanvasCurve _out;
XFadePosition _xfadeposition;
Color _outline_color;
Color _fill_color;
void interpolate ();
};
}
#endif