2 offset.hh -- part of GNU LilyPond
4 (c) 1996--2004 Han-Wen Nienhuys
10 #include "flower-proto.hh"
13 #include "arithmetic-operator.hh"
16 Offset complex_multiply (Offset, Offset);
17 Offset complex_divide (Offset, Offset);
18 Offset complex_exp (Offset);
23 This is a mixture a 2D vector. Sometimes it can
24 also be convenient to think of 2D vectors as complex numbers
25 (ie. x + i y). The naming of some methods reflects that.
31 Real coordinate_a_[NO_AXES];
33 Real &operator[] (Axis i)
35 return coordinate_a_[i];
38 Real operator[] (Axis i) const
40 return coordinate_a_[i];
43 Offset& operator+= (Offset o)
45 (*this)[X_AXIS] += o[X_AXIS];
46 (*this)[Y_AXIS] += o[Y_AXIS];
50 Offset operator - () const
54 o[X_AXIS] = - o[X_AXIS];
55 o[Y_AXIS] = - o[Y_AXIS];
59 Offset& operator-= (Offset o)
61 (*this)[X_AXIS] -= o[X_AXIS];
62 (*this)[Y_AXIS] -= o[Y_AXIS];
67 Offset &scale (Offset o)
69 (*this)[X_AXIS] *= o[X_AXIS];
70 (*this)[Y_AXIS] *= o[Y_AXIS];
75 Offset &operator *= (Real a)
83 Offset (Real ix , Real iy)
85 coordinate_a_[X_AXIS] =ix;
86 coordinate_a_[Y_AXIS] =iy;
91 coordinate_a_[X_AXIS] = coordinate_a_[Y_AXIS]= 0.0;
94 String to_string () const;
96 Offset& mirror (Axis a)
98 coordinate_a_[a] = - coordinate_a_[a];
103 Real length () const;
105 Offset operator *= (Offset z2)
107 *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 o2)
132 mirror (Offset o, Axis a)
140 dot_product (Offset o1, Offset o2)
142 return o1[X_AXIS] * o2[X_AXIS] + o1[Y_AXIS] * o2[Y_AXIS];
146 #endif /* OFFSET_HH */