/*
- misc.cc -- implement various stuff
+ This file is part of LilyPond, the GNU music typesetter.
- source file of the GNU LilyPond music typesetter
-
- (c) 1997--2006 Han-Wen Nienhuys <hanwen@xs4all.nl>
+ Copyright (C) 1997--2014 Han-Wen Nienhuys <hanwen@xs4all.nl>
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
+ 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 <complex>
#include "misc.hh"
-#include "std-string.hh"
+#include "offset.hh"
+#include "warn.hh"
/*
Return the 2-log, rounded down
return log (x) / log (2.0);
}
-vector<string>
-split_string (string str, char c)
+Real
+directed_round (Real f, Direction d)
{
- vector<string> a;
- ssize i = str.find (c);
- while (i != NPOS)
- {
- string s = str.substr (0, i);
- a.push_back (s);
- while (str[++i] == c)
- ;
- str = str.substr (i);
- i = str.find (c);
- }
- if (str.length ())
- a.push_back (str);
- return a;
+ if (d < 0)
+ return floor (f);
+ else
+ return ceil (f);
}
-#if 0
-vector<string>
-split_string (string s, char c)
+/*
+ 0 at threshold, 1 at 0, with 1/x falloff.
+ */
+Real
+peak_around (Real epsilon, Real threshold, Real x)
{
- vector<string> rv;
- while (s.length ())
- {
- ssize i = s.find (c);
+ if (x < 0)
+ return 1.0;
+ return max (- epsilon * (x - threshold) / ((x + epsilon) * threshold), 0.0);
+}
- if (i == 0)
- {
- s = s.substr (1, s.length () -1);
- continue;
- }
+/*
+ 0 at 0, 1 at standard_x, and increasing thereafter.
+ */
+Real
+convex_amplifier (Real standard_x, Real increase_factor, Real x)
+{
+ return (exp (increase_factor * x / standard_x) - 1.0) / (exp (increase_factor) - 1.0);
+}
- if (i == NPOS)
- i = s.length ();
+string
+camel_case_to_lisp_identifier (const string &in)
+{
+ vector<char> out;
- rv.push_back (s.substr (0, i));
- s = s.substr (i, s.length () - i);
+ /* don't add '-' before first character */
+ out.push_back (char (tolower (in[0])));
+
+ for (size_t inpos = 1; inpos < in.size (); inpos++)
+ {
+ if (isupper (in[inpos]))
+ out.push_back ('-');
+ out.push_back ( char (tolower (in[inpos])));
}
- return rv;
-}
-#endif
+ string result (&out[0], out.size ());
+ replace_all (&result, '_', '-');
+ return result;
+}
-Real
-directed_round (Real f, Direction d)
+Offset
+get_point_in_y_direction (Offset orig, Real slope, Real dist, Direction dir)
{
- if (d < 0)
- return floor (f);
- else
- return ceil (f);
-}
+ if (slope == infinity_f)
+ return orig + Offset (dir * dist, 0.0);
+
+ Real x = slope == 0.0 ? 1.0 * dir : 1.0 * sign (slope) * dir;
+ Real y = slope * x;
+ Real angle = atan2 (y, x);
+ complex<Real> orig_c (orig[X_AXIS], orig[Y_AXIS]);
+ complex<Real> to_move = polar (dist, angle);
+ complex<Real> res = orig_c + to_move;
+
+ return Offset (real (res), imag (res));
+}