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change implementation of ArdourCanvas::Curve to use GIMP-inspired ideas.

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Presmooth with quadratic bezier, then interpolate when rendering. Not finished yet
This commit is contained in:
Paul Davis 2014-02-28 17:00:19 -05:00
parent cd8778c789
commit 435c3ad47f
2 changed files with 349 additions and 148 deletions
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19
libs/canvas/canvas/curve.h
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@ -22,10 +22,11 @@
#include "canvas/visibility.h"
#include "canvas/poly_item.h"
#include "canvas/fill.h"
namespace ArdourCanvas {
class LIBCANVAS_API Curve : public PolyItem
class LIBCANVAS_API Curve : public PolyItem, public Fill
{
public:
Curve (Group *);
@ -34,16 +35,20 @@ public:
void render (Rect const & area, Cairo::RefPtr<Cairo::Context>) const;
void set (Points const &);
void set_n_segments (uint32_t n);
void set_n_samples (Points::size_type);
bool covers (Duple const &) const;
private:
Points first_control_points;
Points second_control_points;
Points samples;
Points::size_type n_samples;
uint32_t n_segments;
static void compute_control_points (Points const &,
Points&, Points&);
static double* solve (std::vector<double> const&);
void smooth (Points::size_type p1, Points::size_type p2, Points::size_type p3, Points::size_type p4,
double xfront, double xextent);
double map_value (double) const;
void interpolate ();
};
}