/*
offset.hh -- part of GNU LilyPond
- (c) 1996--2004 Han-Wen Nienhuys
+ (c) 1996--2006 Han-Wen Nienhuys
*/
#ifndef OFFSET_HH
#define OFFSET_HH
-#include "flower-proto.hh"
-#include "real.hh"
-#include "axes.hh"
-#include "arithmetic-operator.hh"
+#include "axis.hh"
+#include "std-string.hh"
#include "string.hh"
+#include "real.hh"
+class Offset;
Offset complex_multiply (Offset, Offset);
Offset complex_divide (Offset, Offset);
Offset complex_exp (Offset);
-
-/** 2d vector
- should change to Complex -- how is vector == complex?
-
- ughr wat een beerput
+/*
+ This is a mixture a 2D vector. Sometimes it can
+ also be convenient to think of 2D vectors as complex numbers
+ (ie. x + i y). The naming of some methods reflects that.
*/
-class Offset
+class Offset
{
public:
Real coordinate_a_[NO_AXES];
-
- Real &operator[] (Axis i)
+
+ Real &operator [] (Axis i)
{
return coordinate_a_[i];
}
- Real operator[] (Axis i) const
+ Real operator [] (Axis i) const
{
return coordinate_a_[i];
}
-
- Offset& operator+= (Offset o)
+
+ Offset &operator += (Offset o)
{
(*this)[X_AXIS] += o[X_AXIS];
(*this)[Y_AXIS] += o[Y_AXIS];
return *this;
}
- Offset operator - () const
+ Offset operator - () const
{
Offset o = *this;
-
- o[X_AXIS] = - o[X_AXIS];
- o[Y_AXIS] = - o[Y_AXIS];
+
+ o[X_AXIS] = -o[X_AXIS];
+ o[Y_AXIS] = -o[Y_AXIS];
return o;
}
- Offset& operator-= (Offset o)
+ Offset &operator -= (Offset o)
{
(*this)[X_AXIS] -= o[X_AXIS];
(*this)[Y_AXIS] -= o[Y_AXIS];
return *this;
}
-
- Offset &scale (Offset o)
+
+ Offset &scale (Offset o)
{
(*this)[X_AXIS] *= o[X_AXIS];
(*this)[Y_AXIS] *= o[Y_AXIS];
return *this;
}
- Offset &operator *= (Real a)
+ Offset &operator /= (Real a)
+ {
+ (*this) *= 1/a;
+ return *this;
+ }
+
+ Offset &operator *= (Real a)
{
(*this)[X_AXIS] *= a;
(*this)[Y_AXIS] *= a;
return *this;
}
-
- Offset (Real ix , Real iy)
+
+ Offset (Real ix, Real iy)
{
- coordinate_a_[X_AXIS] =ix;
- coordinate_a_[Y_AXIS] =iy;
+ coordinate_a_[X_AXIS] = ix;
+ coordinate_a_[Y_AXIS] = iy;
}
- Offset ()
+ Offset ()
{
- coordinate_a_[X_AXIS] = coordinate_a_[Y_AXIS]= 0.0;
+ coordinate_a_[X_AXIS] = coordinate_a_[Y_AXIS] = 0.0;
}
- String to_string () const;
+ Std_string to_string () const;
- Offset& mirror (Axis a)
+ Offset &mirror (Axis a)
{
- coordinate_a_[a] = - coordinate_a_[a];
+ coordinate_a_[a] = -coordinate_a_[a];
return *this;
}
-
- Real arg () const;
- Real length () const;
- //wtf, How is Offset a Complex? is this used?
- Offset operator *= (Offset z2)
+ Real arg () const;
+ Real length () const;
+ bool is_sane () const;
+ Offset operator *= (Offset z2)
{
- *this = complex_multiply (*this,z2);
+ *this = complex_multiply (*this, z2);
return *this;
}
-
};
IMPLEMENT_ARITHMETIC_OPERATOR (Offset, +);
IMPLEMENT_ARITHMETIC_OPERATOR (Offset, *);
inline Offset
-operator* (Real o1, Offset o2)
+operator * (Real o1, Offset o2)
{
o2 *= o1;
return o2;
}
inline Offset
-operator* (Offset o1, Real o2)
+operator / (Offset o1, Real a)
+{
+ o1 /= a;
+ return o1;
+}
+
+inline Offset
+operator * (Offset o1, Real o2)
{
o1 *= o2;
return o1;
return o;
}
+inline
+Real
+dot_product (Offset o1, Offset o2)
+{
+ return o1[X_AXIS] * o2[X_AXIS] + o1[Y_AXIS] * o2[Y_AXIS];
+}
#endif /* OFFSET_HH */
-