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77 lines
2.5 KiB
77 lines
2.5 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/AlignedBox.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>, AlignedBox<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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Vector<N, Real> boxClosest;
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};
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Result operator()(Vector<N, Real> const& point, AlignedBox<N, Real> const& box)
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{
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// Translate the point and box so that the box has center at the
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// origin.
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Vector<N, Real> boxCenter, boxExtent;
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box.GetCenteredForm(boxCenter, boxExtent);
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Vector<N, Real> closest = point - boxCenter;
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Result result;
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DoQuery(closest, boxExtent, result);
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// Compute the closest point on the box.
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result.boxClosest = boxCenter + closest;
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return result;
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}
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protected:
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// On input, 'point' is the difference of the query point and the box
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// center. On output, 'point' is the point on the box closest to the
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// query point.
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void DoQuery(Vector<N, Real>& point, Vector<N, Real> const& boxExtent,
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Result& result)
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{
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result.sqrDistance = (Real)0;
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for (int i = 0; i < N; ++i)
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{
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if (point[i] < -boxExtent[i])
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{
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Real delta = point[i] + boxExtent[i];
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result.sqrDistance += delta * delta;
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point[i] = -boxExtent[i];
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}
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else if (point[i] > boxExtent[i])
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{
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Real delta = point[i] - boxExtent[i];
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result.sqrDistance += delta * delta;
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point[i] = boxExtent[i];
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}
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}
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result.distance = std::sqrt(result.sqrDistance);
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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 DCPPointAlignedBox = DCPQuery<Real, Vector<N, Real>, AlignedBox<N, Real>>;
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template <typename Real>
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using DCPPoint2AlignedBox2 = DCPPointAlignedBox<2, Real>;
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template <typename Real>
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using DCPPoint3AlignedBox3 = DCPPointAlignedBox<3, Real>;
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}
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