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51 lines
1.5 KiB
51 lines
1.5 KiB
// David Eberly, Geometric Tools, Redmond WA 98052
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// Copyright (c) 1998-2021
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// Distributed under the Boost Software License, Version 1.0.
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// https://www.boost.org/LICENSE_1_0.txt
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// https://www.geometrictools.com/License/Boost/LICENSE_1_0.txt
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// Version: 4.0.2019.08.13
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#pragma once
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#include <Mathematics/DCPQuery.h>
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#include <Mathematics/Line.h>
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namespace gte
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{
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template <int N, typename Real>
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class DCPQuery<Real, Vector<N, Real>, Line<N, Real>>
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{
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public:
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struct Result
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{
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Real distance, sqrDistance;
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Real lineParameter; // t in (-infinity,+infinity)
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Vector<N, Real> lineClosest; // origin + t * direction
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};
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Result operator()(Vector<N, Real> const& point, Line<N, Real> const& line)
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{
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Result result;
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Vector<N, Real> diff = point - line.origin;
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result.lineParameter = Dot(line.direction, diff);
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result.lineClosest = line.origin + result.lineParameter * line.direction;
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diff = point - result.lineClosest;
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result.sqrDistance = Dot(diff, diff);
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result.distance = std::sqrt(result.sqrDistance);
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return result;
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}
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};
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// Template aliases for convenience.
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template <int N, typename Real>
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using DCPPointLine = DCPQuery<Real, Vector<N, Real>, Line<N, Real>>;
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template <typename Real>
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using DCPPoint2Line2 = DCPPointLine<2, Real>;
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template <typename Real>
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using DCPPoint3Line3 = DCPPointLine<3, Real>;
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}
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