flower/include/offset.hh

   1 /*
   2   offset.hh -- part of GNU LilyPond
   3
   4   (c) 1996--2004 Han-Wen Nienhuys
   5 */
   6
   7 #ifndef OFFSET_HH
   8 #define OFFSET_HH
   9
  10 #include "flower-proto.hh"
  11 #include "real.hh"
  12 #include "axes.hh"
  13 #include "arithmetic-operator.hh"
  14 #include "string.hh"
  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 -- how is vector == complex?
  23
  24     ughr wat een beerput
  25 */
  26 class Offset
  27 {
  28 public:
  29   Real coordinate_a_[NO_AXES];
  30
  31   Real &operator[] (Axis i)
  32   {
  33     return coordinate_a_[i];
  34   }
  35
  36   Real operator[] (Axis i) const
  37   {
  38     return coordinate_a_[i];
  39   }
  40
  41   Offset& operator+= (Offset o)
  42   {
  43     (*this)[X_AXIS] += o[X_AXIS];
  44     (*this)[Y_AXIS] += o[Y_AXIS];
  45     return *this;
  46   }
  47
  48   Offset operator - () const
  49   {
  50     Offset o = *this;
  51
  52     o[X_AXIS]  = - o[X_AXIS];
  53     o[Y_AXIS]  = - o[Y_AXIS];
  54     return o;
  55   }
  56
  57   Offset& operator-= (Offset o)
  58   {
  59     (*this)[X_AXIS] -= o[X_AXIS];
  60     (*this)[Y_AXIS] -= o[Y_AXIS];
  61
  62     return *this;
  63   }
  64
  65   Offset &scale (Offset o)
  66   {
  67     (*this)[X_AXIS] *= o[X_AXIS];
  68     (*this)[Y_AXIS] *= o[Y_AXIS];
  69
  70     return *this;
  71   }
  72
  73   Offset &operator *= (Real a)
  74   {
  75     (*this)[X_AXIS] *= a;
  76     (*this)[Y_AXIS] *= a;
  77
  78     return *this;
  79   }
  80
  81   Offset (Real ix , Real iy)
  82   {
  83     coordinate_a_[X_AXIS] =ix;
  84     coordinate_a_[Y_AXIS] =iy;
  85   }
  86
  87   Offset ()
  88   {
  89     coordinate_a_[X_AXIS] = coordinate_a_[Y_AXIS]= 0.0;
  90   }
  91
  92   String to_string () const;
  93
  94   Offset& mirror (Axis a)
  95   {
  96     coordinate_a_[a] = - coordinate_a_[a];
  97     return *this;
  98   }
  99
 100   Real arg () const;
 101   Real length () const;
 102
 103   //wtf, How is Offset a Complex? is this used?
 104   Offset operator *= (Offset z2)
 105   {
 106     *this = complex_multiply (*this,z2);
 107     return *this;
 108   }
 109
 110 };
 111
 112 IMPLEMENT_ARITHMETIC_OPERATOR (Offset, +);
 113 IMPLEMENT_ARITHMETIC_OPERATOR (Offset, -);
 114 IMPLEMENT_ARITHMETIC_OPERATOR (Offset, *);
 115
 116 inline Offset
 117 operator* (Real o1, Offset o2)
 118 {
 119   o2 *= o1;
 120   return o2;
 121 }
 122
 123 inline Offset
 124 operator* (Offset o1, Real o2)
 125 {
 126   o1 *= o2;
 127   return o1;
 128 }
 129
 130 inline Offset
 131 mirror (Offset o, Axis a)
 132 {
 133   o.mirror (a);
 134   return o;
 135 }
 136
 137
 138 #endif /* OFFSET_HH */
 139
 140