line.h

/*****************************************************************************
 * VCLib                                                                     *
 * Visual Computing Library                                                  *
 *                                                                           *
 * Copyright(C) 2021-2026                                                    *
 * Visual Computing Lab                                                      *
 * ISTI - Italian National Research Council                                  *
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 * All rights reserved.                                                      *
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 * This program is free software; you can redistribute it and/or modify      *
 * it under the terms of the Mozilla Public License Version 2.0 as published *
 * by the Mozilla Foundation; either version 2 of the License, or            *
 * (at your option) any later version.                                       *
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 * This program is distributed in the hope that it will be useful,           *
 * but WITHOUT ANY WARRANTY; without even the implied warranty of            *
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the              *
 * Mozilla Public License Version 2.0                                        *
 * (https://www.mozilla.org/en-US/MPL/2.0/) for more details.                *
 ****************************************************************************/
 
#ifndef VCL_SPACE_CORE_LINE_H
#define VCL_SPACE_CORE_LINE_H
 
#include "point.h"
 
namespace vcl {
 
template<PointConcept PointT>
class Line
{
    PointT mOrigin;
    PointT mDirection;
 
public:
    using PointType = PointT;
 
    using ScalarType = PointT::ScalarType;
 
    static const uint DIM = PointT::DIM;
 
    Line() {}
 
    Line(const PointT& origin, const PointT& direction) :
            mOrigin(origin), mDirection(direction)
    {
    }
 
    PointT& origin() { return mOrigin; }
 
    const PointT& origin() const { return mOrigin; }
 
    PointT& direction() { return mDirection; }
 
    const PointT& direction() const { return mDirection; }
 
    PointT normalizedDirection() const { return mDirection.normalized(); }
 
    PointT pointAtParameter(ScalarType t) const
    {
        return mOrigin + mDirection * t;
    }
 
    bool operator==(const Line<PointT>& s) const = default;
 
    bool operator!=(const Line<PointT>& s) const = default;
};
 
/* Specialization Aliases */
 
template<typename S>
using Line2 = Line<Point2<S>>;
 
using Line2i = Line<Point2i>;
using Line2f = Line<Point2f>;
using Line2d = Line<Point2d>;
 
template<typename S>
using Line3 = Line<Point3<S>>;
 
using Line3i = Line<Point3i>;
using Line3f = Line<Point3f>;
using Line3d = Line<Point3d>;
 
/* Concepts */
 
template<typename T>
concept LineConcept = std::derived_from< // same type or derived type
    std::remove_cvref_t<T>,
    Line<typename RemoveRef<T>::PointType>>;
 
template<typename T>
concept Line2Concept = LineConcept<T> && RemoveRef<T>::DIM == 2;
 
template<typename T>
concept Line3Concept = LineConcept<T> && RemoveRef<T>::DIM == 3;
 
} // namespace vcl
 
#endif // VCL_SPACE_CORE_LINE_H