/*
This file is part of LilyPond, the GNU music typesetter.
- Copyright (C) 1998--2014 Jan Nieuwenhuizen <janneke@gnu.org>
+ Copyright (C) 1998--2015 Jan Nieuwenhuizen <janneke@gnu.org>
LilyPond is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
return o;
}
-Real
-Bezier::slope_at_point (Real t) const
+// The return value is normalized unless zero or indefinite.
+Offset
+Bezier::dir_at_point (Real t) const
{
Offset second_order[3];
Offset third_order[2];
for (vsize i = 0; i < 2; i++)
third_order[i] = ((second_order[i + 1] - second_order[i]) * t) + second_order[i];
- if (third_order[1][X_AXIS] - third_order[0][X_AXIS] == 0)
- return infinity_f;
-
- return (third_order[1][Y_AXIS] - third_order[0][Y_AXIS]) / (third_order[1][X_AXIS] - third_order[0][X_AXIS]);
+ return (third_order[1] - third_order[0]).direction ();
}
/*