2 offset.cc -- implement Offset
4 source file of the GNU LilyPond music typesetter
6 (c) 1997--1998 Han-Wen Nienhuys <hanwen@stack.nl>
21 s = String("(") + coordinate_a_[X_AXIS] + ", " + coordinate_a_[Y_AXIS] + ")";
27 complex_multiply (Offset z1, Offset z2)
30 z[X_AXIS] = z1[X_AXIS] * z2[X_AXIS] - z1[Y_AXIS]*z2[Y_AXIS];
31 z[Y_AXIS] = z1[X_AXIS] * z2[Y_AXIS] + z1[Y_AXIS] * z2[X_AXIS];
36 complex_exp (Offset o)
38 Real s = sin (o[Y_AXIS]);
39 Real c = cos (o[Y_AXIS]);
41 Real r = exp (o[X_AXIS]);
43 return Offset(r*c, r*s);
49 return atan2 (y (), x());
53 euclidian vector length / complex modulus
56 Offset::length () const
58 return sqrt (sqr (x()) + sqr (y()));
61 Offset::mirror (Axis a)
63 coordinate_a_[a] = - coordinate_a_[a];