flower/include/offset.hh

   1 /*
   2   offset.hh -- part of GNU LilyPond
   3
   4   (c) 1996,97 Han-Wen Nienhuys
   5 */
   6
   7 #ifndef OFFSET_HH
   8 #define OFFSET_HH
   9
  10 #include "real.hh"
  11 #include "axes.hh"
  12 #include "arithmetic-operator.hh"
  13
  14 struct Offset;
  15
  16 Offset complex_multiply (Offset, Offset);
  17 Offset complex_divide (Offset, Offset);
  18 Offset complex_exp (Offset);
  19
  20
  21 /** 2d vector
  22     should change to Complex
  23 */
  24 struct Offset {
  25 public:
  26   Real coordinate_a_[NO_AXES];
  27
  28   Real &operator[] (Axis i) {
  29     return coordinate_a_[i];
  30   }
  31   Real operator[] (Axis i) const{
  32     return coordinate_a_[i];
  33   }
  34
  35   Offset& operator+= (Offset o) {
  36  (*this)[X_AXIS] += o[X_AXIS];
  37  (*this)[Y_AXIS] += o[Y_AXIS];
  38     return *this;
  39   }
  40   Offset operator - () const {
  41     Offset o = *this;
  42
  43     o[X_AXIS]  = - o[X_AXIS];
  44     o[Y_AXIS]  = - o[Y_AXIS];
  45     return o;
  46   }
  47   Offset& operator-= (Offset o) {
  48  (*this)[X_AXIS] -= o[X_AXIS];
  49  (*this)[Y_AXIS] -= o[Y_AXIS];
  50
  51     return *this;
  52   }
  53
  54   Offset &scale (Offset o) {
  55  (*this)[X_AXIS] *= o[X_AXIS];
  56  (*this)[Y_AXIS] *= o[Y_AXIS];
  57
  58     return *this;
  59   }
  60   Offset &operator *= (Real a) {
  61  (*this)[X_AXIS] *= a;
  62  (*this)[Y_AXIS] *= a;
  63
  64     return *this;
  65   }
  66
  67   Offset (Real ix , Real iy) {
  68     coordinate_a_[X_AXIS] =ix;
  69     coordinate_a_[Y_AXIS] =iy;
  70   }
  71   Offset () {
  72     coordinate_a_[X_AXIS]=
  73       coordinate_a_[Y_AXIS]=
  74       0.0;
  75   }
  76
  77   String str () const;
  78
  79   void mirror (Axis);
  80   Real  arg () const;
  81   Real length () const;
  82   Offset operator *= (Offset z2) {
  83     *this = complex_multiply (*this,z2);
  84     return *this;
  85   }
  86
  87 };
  88
  89 IMPLEMENT_ARITHMETIC_OPERATOR (Offset, +);
  90 IMPLEMENT_ARITHMETIC_OPERATOR (Offset, -);
  91 IMPLEMENT_ARITHMETIC_OPERATOR (Offset, *);
  92
  93 inline Offset
  94 operator* (Real o1, Offset o2)
  95 {
  96   o2 *= o1;
  97   return o2;
  98 }
  99
 100 inline Offset
 101 operator* (Offset o1, Real o2)
 102 {
 103   o1 *= o2;
 104   return o1;
 105 }
 106
 107
 108 #endif // OFFSET_HH
 109
 110