2 offset.hh -- part of GNU LilyPond
4 (c) 1996--2005 Han-Wen Nienhuys
14 Offset complex_multiply (Offset, Offset);
15 Offset complex_divide (Offset, Offset);
16 Offset complex_exp (Offset);
19 This is a mixture a 2D vector. Sometimes it can
20 also be convenient to think of 2D vectors as complex numbers
21 (ie. x + i y). The naming of some methods reflects that.
26 Real coordinate_a_[NO_AXES];
28 Real &operator [] (Axis i)
30 return coordinate_a_[i];
33 Real operator [] (Axis i) const
35 return coordinate_a_[i];
38 Offset &operator += (Offset o)
40 (*this)[X_AXIS] += o[X_AXIS];
41 (*this)[Y_AXIS] += o[Y_AXIS];
45 Offset operator - () const
49 o[X_AXIS] = -o[X_AXIS];
50 o[Y_AXIS] = -o[Y_AXIS];
54 Offset &operator -= (Offset o)
56 (*this)[X_AXIS] -= o[X_AXIS];
57 (*this)[Y_AXIS] -= o[Y_AXIS];
62 Offset &scale (Offset o)
64 (*this)[X_AXIS] *= o[X_AXIS];
65 (*this)[Y_AXIS] *= o[Y_AXIS];
70 Offset &operator /= (Real a)
76 Offset &operator *= (Real a)
84 Offset (Real ix, Real iy)
86 coordinate_a_[X_AXIS] = ix;
87 coordinate_a_[Y_AXIS] = iy;
92 coordinate_a_[X_AXIS] = coordinate_a_[Y_AXIS] = 0.0;
95 String to_string () const;
97 Offset &mirror (Axis a)
99 coordinate_a_[a] = -coordinate_a_[a];
104 Real length () const;
105 bool is_sane () const;
106 Offset operator *= (Offset z2)
108 *this = complex_multiply (*this, z2);
113 IMPLEMENT_ARITHMETIC_OPERATOR (Offset, +);
114 IMPLEMENT_ARITHMETIC_OPERATOR (Offset, -);
115 IMPLEMENT_ARITHMETIC_OPERATOR (Offset, *);
118 operator * (Real o1, Offset o2)
125 operator / (Offset o1, Real a)
132 operator * (Offset o1, Real o2)
139 mirror (Offset o, Axis a)
147 dot_product (Offset o1, Offset o2)
149 return o1[X_AXIS] * o2[X_AXIS] + o1[Y_AXIS] * o2[Y_AXIS];
152 #endif /* OFFSET_HH */