/*
offset.hh -- part of GNU LilyPond
- (c) 1996,97 Han-Wen Nienhuys
+ (c) 1996--2005 Han-Wen Nienhuys
*/
#ifndef OFFSET_HH
#define OFFSET_HH
-#include "real.hh"
#include "axes.hh"
+#include "string.hh"
+
+Offset complex_multiply (Offset, Offset);
+Offset complex_divide (Offset, Offset);
+Offset complex_exp (Offset);
+
+
+/*
+
+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.
-/** 2d vector
- should change to Complex
*/
-struct Offset {
+class Offset
+{
public:
-
Real coordinate_a_[NO_AXES];
- Real &y() { return coordinate_a_[Y_AXIS]; }
- Real &x() { return coordinate_a_[X_AXIS]; }
- Real y() const { return coordinate_a_[Y_AXIS]; }
- Real x() const { return coordinate_a_[X_AXIS]; }
-
- 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) {
- x()+=o.x ();
- y()+=o.y ();
+ 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 () = - o.x ();
- o.y () = - o.y ();
- return *this;
+
+ o[X_AXIS] = - o[X_AXIS];
+ o[Y_AXIS] = - o[Y_AXIS];
+ return o;
}
- Offset& operator-=(Offset o) {
- x()-=o.x ();
- y()-=o.y ();
+
+ Offset& operator-= (Offset o)
+ {
+ (*this)[X_AXIS] -= o[X_AXIS];
+ (*this)[Y_AXIS] -= o[Y_AXIS];
+
return *this;
}
- Offset &scale (Offset o) {
- x()*=o.x ();
- y()*=o.y ();
+ Offset &scale (Offset o)
+ {
+ (*this)[X_AXIS] *= o[X_AXIS];
+ (*this)[Y_AXIS] *= o[Y_AXIS];
+
return *this;
}
- Offset &operator *=(Real a) {
- y() *= a;
- x() *= a;
+
+ Offset &operator *= (Real a)
+ {
+ (*this)[X_AXIS] *= a;
+ (*this)[Y_AXIS] *= a;
+
return *this;
}
- Offset (Real ix , Real iy) {
- x()=ix;
- y()=iy;
+ Offset (Real ix , Real iy)
+ {
+ coordinate_a_[X_AXIS] =ix;
+ coordinate_a_[Y_AXIS] =iy;
}
- Offset() {
- x()=0.0;
- y()=0.0;
+
+ Offset ()
+ {
+ coordinate_a_[X_AXIS] = coordinate_a_[Y_AXIS]= 0.0;
}
-#ifndef STANDALONE
- String str () const;
-#endif
- void mirror (Axis);
- Real arg () const;
+ String to_string () const;
+
+ Offset& mirror (Axis a)
+ {
+ coordinate_a_[a] = - coordinate_a_[a];
+ return *this;
+ }
+
+ Real arg () const;
Real length () const;
-};
-Offset complex_multiply (Offset, Offset);
-Offset complex_exp (Offset);
+ Offset operator *= (Offset z2)
+ {
+ *this = complex_multiply (*this, z2);
+ return *this;
+ }
+};
-inline Offset
-operator* (Offset z1, Offset z2)
-{
- return complex_multiply (z1,z2);
-}
+IMPLEMENT_ARITHMETIC_OPERATOR (Offset, +);
+IMPLEMENT_ARITHMETIC_OPERATOR (Offset, -);
+IMPLEMENT_ARITHMETIC_OPERATOR (Offset, *);
inline Offset
-operator+ (Offset o1, Offset const& o2)
+operator* (Real o1, Offset o2)
{
- o1 += o2;
- return o1;
+ o2 *= o1;
+ return o2;
}
inline Offset
-operator- (Offset o1, Offset const& o2)
+operator* (Offset o1, Real o2)
{
- o1 -= o2;
+ o1 *= o2;
return o1;
}
-
inline Offset
-operator* (Real o1, Offset o2)
+mirror (Offset o, Axis a)
{
- o2 *= o1;
- return o2;
+ o.mirror (a);
+ return o;
}
-inline Offset
-operator* (Offset o1, Real o2)
+inline
+Real
+dot_product (Offset o1, Offset o2)
{
- o1 *= o2;
- return o1;
+ return o1[X_AXIS] * o2[X_AXIS] + o1[Y_AXIS] * o2[Y_AXIS];
}
-#endif // OFFSET_HH
+#endif /* OFFSET_HH */