2 offset.cc -- implement Offset
4 source file of the GNU LilyPond music typesetter
6 (c) 1997--1999 Han-Wen Nienhuys <hanwen@cs.uu.nl>
21 s = String("(") + to_str (coordinate_a_[X_AXIS]) + ", "
22 + to_str (coordinate_a_[Y_AXIS]) + ")";
28 complex_multiply (Offset z1, Offset z2)
31 z[X_AXIS] = z1[X_AXIS] * z2[X_AXIS] - z1[Y_AXIS]*z2[Y_AXIS];
32 z[Y_AXIS] = z1[X_AXIS] * z2[Y_AXIS] + z1[Y_AXIS] * z2[X_AXIS];
37 complex_exp (Offset o)
39 Real s = sin (o[Y_AXIS]);
40 Real c = cos (o[Y_AXIS]);
42 Real r = exp (o[X_AXIS]);
44 return Offset(r*c, r*s);
50 return atan2 (y (), x());
54 euclidian vector length / complex modulus
57 Offset::length () const
59 return sqrt (sqr (x()) + sqr (y()));
62 Offset::mirror (Axis a)
64 coordinate_a_[a] = - coordinate_a_[a];