-// Copyright (C) 2006 Mathias Froehlich - Mathias.Froehlich@web.de
+// Copyright (C) 2006-2009 Mathias Froehlich - Mathias.Froehlich@web.de
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Library General Public
#ifndef SGVec2_H
#define SGVec2_H
-#if defined ( __CYGWIN__ )
-#include <ieeefp.h>
-#endif
-
+#ifndef NO_OPENSCENEGRAPH_INTERFACE
#include <osg/Vec2f>
#include <osg/Vec2d>
-
-template<typename T>
-struct SGVec2Storage {
- /// Readonly raw storage interface
- const T (&data(void) const)[2]
- { return _data; }
- /// Readonly raw storage interface
- T (&data(void))[2]
- { return _data; }
-
- void osg() const
- { }
-
-private:
- T _data[2];
-};
-
-template<>
-struct SGVec2Storage<float> : public osg::Vec2f {
- /// Access raw data by index, the index is unchecked
- const float (&data(void) const)[2]
- { return osg::Vec2f::_v; }
- /// Access raw data by index, the index is unchecked
- float (&data(void))[2]
- { return osg::Vec2f::_v; }
-
- const osg::Vec2f& osg() const
- { return *this; }
- osg::Vec2f& osg()
- { return *this; }
-};
-
-template<>
-struct SGVec2Storage<double> : public osg::Vec2d {
- /// Access raw data by index, the index is unchecked
- const double (&data(void) const)[2]
- { return osg::Vec2d::_v; }
- /// Access raw data by index, the index is unchecked
- double (&data(void))[2]
- { return osg::Vec2d::_v; }
-
- const osg::Vec2d& osg() const
- { return *this; }
- osg::Vec2d& osg()
- { return *this; }
-};
+#endif
/// 2D Vector Class
template<typename T>
-class SGVec2 : protected SGVec2Storage<T> {
+class SGVec2 {
public:
typedef T value_type;
/// make sure it has at least 2 elements
explicit SGVec2(const T* d)
{ data()[0] = d[0]; data()[1] = d[1]; }
- explicit SGVec2(const osg::Vec2f& d)
- { data()[0] = d[0]; data()[1] = d[1]; }
- explicit SGVec2(const osg::Vec2d& d)
+ template<typename S>
+ explicit SGVec2(const SGVec2<S>& d)
{ data()[0] = d[0]; data()[1] = d[1]; }
/// Access by index, the index is unchecked
T& y(void)
{ return data()[1]; }
- /// Get the data pointer
- using SGVec2Storage<T>::data;
-
- /// Readonly interface function to ssg's sgVec2/sgdVec2
- const T (&sg(void) const)[2]
- { return data(); }
- /// Interface function to ssg's sgVec2/sgdVec2
- T (&sg(void))[2]
- { return data(); }
-
- /// Interface function to osg's Vec2*
- using SGVec2Storage<T>::osg;
+ /// Access raw data
+ const T (&data(void) const)[2]
+ { return _data; }
+ /// Access raw data
+ T (&data(void))[2]
+ { return _data; }
/// Inplace addition
SGVec2& operator+=(const SGVec2& v)
{ return SGVec2(1, 0); }
static SGVec2 e2(void)
{ return SGVec2(0, 1); }
+
+private:
+ T _data[2];
};
/// Unary +, do nothing ...
inline
SGVec2<T>
normalize(const SGVec2<T>& v)
-{ return (1/norm(v))*v; }
+{
+ T normv = norm(v);
+ if (normv <= SGLimits<T>::min())
+ return SGVec2<T>::zeros();
+ return (1/normv)*v;
+}
/// Return true if exactly the same
template<typename T>
distSqr(const SGVec2<T>& v1, const SGVec2<T>& v2)
{ SGVec2<T> tmp = v1 - v2; return dot(tmp, tmp); }
+// calculate the projection of u along the direction of d.
+template<typename T>
+inline
+SGVec2<T>
+projection(const SGVec2<T>& u, const SGVec2<T>& d)
+{
+ T denom = dot(d, d);
+ T ud = dot(u, d);
+ if (SGLimits<T>::min() < denom) return u;
+ else return d * (dot(u, d) / denom);
+}
+
#ifndef NDEBUG
template<typename T>
inline
toVec2d(const SGVec2f& v)
{ return SGVec2d(v(0), v(1)); }
+#ifndef NO_OPENSCENEGRAPH_INTERFACE
+inline
+SGVec2d
+toSG(const osg::Vec2d& v)
+{ return SGVec2d(v[0], v[1]); }
+
+inline
+SGVec2f
+toSG(const osg::Vec2f& v)
+{ return SGVec2f(v[0], v[1]); }
+
+inline
+osg::Vec2d
+toOsg(const SGVec2d& v)
+{ return osg::Vec2d(v[0], v[1]); }
+
+inline
+osg::Vec2f
+toOsg(const SGVec2f& v)
+{ return osg::Vec2f(v[0], v[1]); }
+
+#endif
+
#endif