/*
- offset.cc -- implement Offset
+ This file is part of LilyPond, the GNU music typesetter.
- source file of the GNU LilyPond music typesetter
+ Copyright (C) 1997--2014 Han-Wen Nienhuys <hanwen@xs4all.nl>
- (c) 1997--2007 Han-Wen Nienhuys <hanwen@xs4all.nl>
+ LilyPond 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 3 of the License, or
+ (at your option) any later version.
+
+ LilyPond 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 LilyPond. If not, see <http://www.gnu.org/licenses/>.
*/
#include "offset.hh"
-
#ifndef STANDALONE
string
Offset::to_string () const
{
string s;
s = string (" (") + ::to_string (coordinate_a_[X_AXIS]) + ", "
- + ::to_string (coordinate_a_[Y_AXIS]) + ")";
+ + ::to_string (coordinate_a_[Y_AXIS]) + ")";
return s;
}
#endif
-bool
-isinf_b (Real r)
-{
- return (fabs (r) > 1e20);
-}
-
/*
free bsd fix by John Galbraith
*/
complex_multiply (Offset z1, Offset z2)
{
Offset z;
- if (!isinf_b (z2[Y_AXIS]))
+ if (!isinf (z2[Y_AXIS]))
{
z[X_AXIS] = z1[X_AXIS] * z2[X_AXIS] - z1[Y_AXIS] * z2[Y_AXIS];
z[Y_AXIS] = z1[X_AXIS] * z2[Y_AXIS] + z1[Y_AXIS] * z2[X_AXIS];
return atan2 (coordinate_a_[Y_AXIS], coordinate_a_[X_AXIS]);
}
+Real
+Offset::angle_degrees () const
+{
+ return arg () * 180 / M_PI;
+}
/**
euclidian vector length / complex modulus
*/
Offset::length () const
{
return sqrt (sqr (coordinate_a_[X_AXIS])
- + sqr (coordinate_a_[Y_AXIS]));
+ + sqr (coordinate_a_[Y_AXIS]));
}
bool
Offset::is_sane () const
{
return !isnan (coordinate_a_[X_AXIS])
- && !isnan (coordinate_a_ [Y_AXIS])
- && !isinf (coordinate_a_[X_AXIS])
- && !isnan (coordinate_a_[Y_AXIS]);
+ && !isnan (coordinate_a_ [Y_AXIS])
+ && !isinf (coordinate_a_[X_AXIS])
+ && !isinf (coordinate_a_[Y_AXIS]);
+}
+
+Offset
+Offset::direction () const
+{
+ Offset d = *this;
+ d /= length ();
+ return d;
+}
+
+Offset
+Offset::swapped () const
+{
+ return Offset (coordinate_a_[Y_AXIS], coordinate_a_[X_AXIS]);
}