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Add smart cast functions and ctor with scalar conversion (explicit)

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to all classes of the Geometry module. By smart I mean that if current
type == new type, then it returns a const reference to *this => zero overhead
This commit is contained in:
Gael Guennebaud
2008-10-25 22:38:22 +00:00
parent 568a7e8eba
commit e5b8a59cfa
9 changed files with 361 additions and 224 deletions
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109
Eigen/src/Geometry/ParametrizedLine.h
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@@ -45,65 +45,86 @@ class ParametrizedLine
: public ei_with_aligned_operator_new<_Scalar,_AmbientDim>
#endif
{
public:
public:
enum { AmbientDimAtCompileTime = _AmbientDim };
typedef _Scalar Scalar;
typedef typename NumTraits<Scalar>::Real RealScalar;
typedef Matrix<Scalar,AmbientDimAtCompileTime,1> VectorType;
enum { AmbientDimAtCompileTime = _AmbientDim };
typedef _Scalar Scalar;
typedef typename NumTraits<Scalar>::Real RealScalar;
typedef Matrix<Scalar,AmbientDimAtCompileTime,1> VectorType;
/** Default constructor without initialization */
inline explicit ParametrizedLine() {}
/** Default constructor without initialization */
inline explicit ParametrizedLine() {}
/** Constructs a dynamic-size line with \a _dim the dimension
* of the ambient space */
inline explicit ParametrizedLine(int _dim) : m_origin(_dim), m_direction(_dim) {}
/** Constructs a dynamic-size line with \a _dim the dimension
* of the ambient space */
inline explicit ParametrizedLine(int _dim) : m_origin(_dim), m_direction(_dim) {}
/** Initializes a parametrized line of direction \a direction and origin \a origin.
* \warning the vector direction is assumed to be normalized.
*/
ParametrizedLine(const VectorType& origin, const VectorType& direction)
: m_origin(origin), m_direction(direction) {}
/** Initializes a parametrized line of direction \a direction and origin \a origin.
* \warning the vector direction is assumed to be normalized.
*/
ParametrizedLine(const VectorType& origin, const VectorType& direction)
: m_origin(origin), m_direction(direction) {}
explicit ParametrizedLine(const Hyperplane<_Scalar, _AmbientDim>& hyperplane);
explicit ParametrizedLine(const Hyperplane<_Scalar, _AmbientDim>& hyperplane);
/** Constructs a parametrized line going from \a p0 to \a p1. */
static inline ParametrizedLine Through(const VectorType& p0, const VectorType& p1)
{ return ParametrizedLine(p0, (p1-p0).normalized()); }
/** Constructs a parametrized line going from \a p0 to \a p1. */
static inline ParametrizedLine Through(const VectorType& p0, const VectorType& p1)
{ return ParametrizedLine(p0, (p1-p0).normalized()); }
~ParametrizedLine() {}
~ParametrizedLine() {}
/** \returns the dimension in which the line holds */
inline int dim() const { return m_direction.size(); }
/** \returns the dimension in which the line holds */
inline int dim() const { return m_direction.size(); }
const VectorType& origin() const { return m_origin; }
VectorType& origin() { return m_origin; }
const VectorType& origin() const { return m_origin; }
VectorType& origin() { return m_origin; }
const VectorType& direction() const { return m_direction; }
VectorType& direction() { return m_direction; }
const VectorType& direction() const { return m_direction; }
VectorType& direction() { return m_direction; }
/** \returns the squared distance of a point \a p to its projection onto the line \c *this.
* \sa distance()
*/
RealScalar squaredDistance(const VectorType& p) const
{
VectorType diff = p-origin();
return (diff - diff.dot(direction())* direction()).norm2();
}
/** \returns the distance of a point \a p to its projection onto the line \c *this.
* \sa squaredDistance()
*/
RealScalar distance(const VectorType& p) const { return ei_sqrt(squaredDistance(p)); }
/** \returns the squared distance of a point \a p to its projection onto the line \c *this.
* \sa distance()
*/
RealScalar squaredDistance(const VectorType& p) const
{
VectorType diff = p-origin();
return (diff - diff.dot(direction())* direction()).norm2();
}
/** \returns the distance of a point \a p to its projection onto the line \c *this.
* \sa squaredDistance()
*/
RealScalar distance(const VectorType& p) const { return ei_sqrt(squaredDistance(p)); }
/** \returns the projection of a point \a p onto the line \c *this. */
VectorType projection(const VectorType& p) const
{ return origin() + (p-origin()).dot(direction()) * direction(); }
/** \returns the projection of a point \a p onto the line \c *this. */
VectorType projection(const VectorType& p) const
{ return origin() + (p-origin()).dot(direction()) * direction(); }
Scalar intersection(const Hyperplane<_Scalar, _AmbientDim>& hyperplane);
Scalar intersection(const Hyperplane<_Scalar, _AmbientDim>& hyperplane);
protected:
/** \returns \c *this with scalar type casted to \a NewScalarType
*
* Note that if \a NewScalarType is equal to the current scalar type of \c *this
* then this function smartly returns a const reference to \c *this.
*/
template<typename NewScalarType>
typename ei_cast_return_type<ParametrizedLine,
ParametrizedLine<NewScalarType,AmbientDimAtCompileTime> >::type cast() const
{
return typename ei_cast_return_type<ParametrizedLine,
ParametrizedLine<NewScalarType,AmbientDimAtCompileTime> >::type(*this);
}
VectorType m_origin, m_direction;
/** Copy constructor with scalar type conversion */
template<typename OtherScalarType>
explicit ParametrizedLine(const ParametrizedLine<OtherScalarType,AmbientDimAtCompileTime>& other)
{
m_origin = other.origin().template cast<OtherScalarType>();
m_direction = other.direction().template cast<OtherScalarType>();
}
protected:
VectorType m_origin, m_direction;
};
/** Constructs a parametrized line from a 2D hyperplane