ray_2d.inl

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/** @file
 *  @author Bram de Greve (bramz@users.sourceforge.net)
 *  @author Tom De Muer (tomdemuer@users.sourceforge.net)
 *
 *  *** BEGIN LICENSE INFORMATION ***
 *  
 *  The contents of this file are subject to the Common Public Attribution License 
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 *  the License. You may obtain a copy of the License at 
 *  http://lass.sourceforge.net/cpal-license. The License is based on the 
 *  Mozilla Public License Version 1.1 but Sections 14 and 15 have been added to cover 
 *  use of software over a computer network and provide for limited attribution for 
 *  the Original Developer. In addition, Exhibit A has been modified to be consistent 
 *  with Exhibit B.
 *  
 *  Software distributed under the License is distributed on an "AS IS" basis, WITHOUT 
 *  WARRANTY OF ANY KIND, either express or implied. See the License for the specific 
 *  language governing rights and limitations under the License.
 *  
 *  The Original Code is LASS - Library of Assembled Shared Sources.
 *  
 *  The Initial Developer of the Original Code is Bram de Greve and Tom De Muer.
 *  The Original Developer is the Initial Developer.
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 *  *** END LICENSE INFORMATION ***
 */



#ifndef LASS_GUARDIAN_OF_INCLUSION_PRIM_RAY_2D_INL
#define LASS_GUARDIAN_OF_INCLUSION_PRIM_RAY_2D_INL




#include "ray_2d.h"



namespace lass
{

namespace prim
{

template <typename T, class NP, class PP>
Ray2D<T, NP, PP>::Ray2D():
    support_(),
    direction_()
{
    LASS_ASSERT(support_.isZero());
    LASS_ASSERT(direction_.isZero());
}



template <typename T, class NP, class PP>
Ray2D<T, NP, PP>::Ray2D(const TPoint& iSupport, const TVector& iDirection):
    support_(iSupport),
    direction_(iDirection)
{
    NP::normalize(direction_);
}



template <typename T, class NP, class PP>
Ray2D<T, NP, PP>::Ray2D(const TPoint& iSupport, const TPoint& iLookAt):
    support_(iSupport),
    direction_(iLookAt - iSupport)
{
    NP::normalize(direction_);
}



/** return origin of ray.
 *  the origin is also the support point of the ray.
 */
template <typename T, class NP, class PP>
const typename Ray2D<T, NP, PP>::TPoint&
Ray2D<T, NP, PP>::support() const
{
    return support_;
}



/** access origin of ray
 *  the origin is also the support point of the ray.
 */
template <typename T, class NP, class PP>
typename Ray2D<T, NP, PP>::TPoint&
Ray2D<T, NP, PP>::support()
{
    return support_;
}



/** Return direction of ray.
 */
template <typename T, class NP, class PP>
const typename Ray2D<T, NP, PP>::TVector&
Ray2D<T, NP, PP>::direction() const
{
    return direction_;
}



/** Set direction and normalize it if that's the policy
 */
template <typename T, class NP, class PP>
void Ray2D<T, NP, PP>::setDirection(const TVector& iDirection)
{
    direction_ = iDirection;
    NP::normalize(direction_);
}



/** Set direction from origin to look-at point.
 */
template <typename T, class NP, class PP>
void Ray2D<T, NP, PP>::lookAt(const TPoint& iLookAt)
{
    direction_ = iLookAt - support_;
    NP::normalize(direction_);
}



/** Return point on ray by it's parameter.
 *  @exception throw an error if parameter is out of range t >= 0, if Bounded is
 *             used as @c ParameterPolicy.
 *  @return origin + t * direction
 */
template <typename T, class NP, class PP>
const typename Ray2D<T, NP, PP>::TPoint
Ray2D<T, NP, PP>::point(TParam iT) const
{
    TParameterPolicy::enforceRange(iT, TNumTraits::zero);
    return support_ + iT * direction_;
}



/** Return parameter of point on the ray that is the projection of the given point.
 *  @warning it can return a (invalid) negative number even if you've used a bounded parameter policy.
 */
template <typename T, class NP, class PP>
const typename Ray2D<T, NP, PP>::TValue
Ray2D<T, NP, PP>::t(const TPoint& iPoint) const
{
    return NP::divideBySquaredNorm(dot(iPoint - support_, direction_), direction_);
}



/** Project vector on the axis of the ray
 */
template <typename T, class NP, class PP>
const typename Ray2D<T, NP, PP>::TVector
Ray2D<T, NP, PP>::project(const TVector& iVector) const
{
    return direction_ * NP::divideBySquaredNorm(dot(iVector, direction_), direction_);
}



/** Reject vector against the axis of the ray
 */
template <typename T, class NP, class PP>
const typename Ray2D<T, NP, PP>::TVector
Ray2D<T, NP, PP>::reject(const TVector& iVector) const
{
    return iVector - project(iVector);
}



/** Reflect vector against the axis of the ray
 */
template <typename T, class NP, class PP>
const typename Ray2D<T, NP, PP>::TVector
Ray2D<T, NP, PP>::reflect(const TVector& iVector) const
{
    return 2 * project(iVector) - iVector;
}




/** Project point on the axis of the ray
 */
template <typename T, class NP, class PP>
const typename Ray2D<T, NP, PP>::TPoint
Ray2D<T, NP, PP>::project(const TPoint& iPoint) const
{
    return support_ + project(iPoint - support_);
}



/** Reject point against the axis of the ray
 */
template <typename T, class NP, class PP>
const typename Ray2D<T, NP, PP>::TVector
Ray2D<T, NP, PP>::reject(const TPoint& iPoint) const
{
    return reject(iPoint - support_);
}



/** Reject point against the axis of the ray
 */
template <typename T, class NP, class PP>
const typename Ray2D<T, NP, PP>::TPoint
Ray2D<T, NP, PP>::reflect(const TPoint& iPoint) const
{
    return support_ + reflect(iPoint - support_);
}



/** Return on what side a point is located.
 */
template <typename T, class NP, class PP>
const Side Ray2D<T, NP, PP>::classify(const TPoint& iPoint) const
{
    T surf = doubleTriangleArea(support_,support_+direction_,iPoint);
    if (surf>T(0))
        return sLeft;
    if (surf<T(0))
        return sRight;
    return sSurface;
}


/** Return true if ray is valid (direction isn't a zero vector).
 */
template <typename T, class NP, class PP>
const bool Ray2D<T, NP, PP>::isValid() const
{
    return !direction_.isZero();
}



/** @relates lass::prim::Ray2D
 */
template<typename T, class NP>
std::ostream& operator<<(std::ostream& ioOStream, const Ray2D<T, NP>& iRay)
{
    LASS_ENFORCE(ioOStream) << "{O=" << iRay.origin() << ", D=" << iRay.direction() << "}";
    return ioOStream;
}



/** @relates lass::prim::Ray2D
 */
template<typename T, class NP>
io::XmlOStream& operator<<(io::XmlOStream& ioOStream, const Ray2D<T, NP>& iRay)
{
    LASS_ENFORCE_STREAM(ioOStream)
        << "<Ray2D>\n"
        << "<support>" << iRay.support() << "</support>\n"
        << "<direction>" << iRay.direction() << "</direction>\n"
        << "</Ray2D>\n";
    return ioOStream;
}

}

}

#endif

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