/*
- 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--2015 Han-Wen Nienhuys <hanwen@xs4all.nl>
- (c) 1997--2008 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"
{
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
Real
Offset::length () const
{
- return sqrt (sqr (coordinate_a_[X_AXIS])
- + sqr (coordinate_a_[Y_AXIS]));
+ return hypot (coordinate_a_[X_AXIS], 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])
- && !isinf (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 ();
+ if (isinf (d[X_AXIS]))
+ {
+ if (!isinf (d[Y_AXIS]))
+ return Offset ((d[X_AXIS] > 0.0 ? 1.0 : -1.0), 0.0);
+ }
+ else if (isinf (d[Y_AXIS]))
+ return Offset (0.0, (d[Y_AXIS] > 0.0 ? 1.0 : -1.0));
+ else if (d[X_AXIS] == 0.0 && d[Y_AXIS] == 0.0)
+ return d;
+ // The other cases propagate or produce NaN as appropriate.
+
+ d /= length ();
return d;
}