| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | // -*- mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- | ||
| 2 | // vi: set et ts=4 sw=4 sts=4: | ||
| 3 | // | ||
| 4 | // SPDX-FileCopyrightText: Copyright © DuMux Project contributors, see AUTHORS.md in root folder | ||
| 5 | // SPDX-License-Identifier: GPL-3.0-or-later | ||
| 6 | // | ||
| 7 | /*! | ||
| 8 | * \file | ||
| 9 | * \ingroup Geometry | ||
| 10 | * \brief Helper functions for normals | ||
| 11 | */ | ||
| 12 | #ifndef DUMUX_GEOMETRY_NORMAL_HH | ||
| 13 | #define DUMUX_GEOMETRY_NORMAL_HH | ||
| 14 | |||
| 15 | #include <algorithm> | ||
| 16 | #include <dune/common/float_cmp.hh> | ||
| 17 | |||
| 18 | namespace Dumux { | ||
| 19 | |||
| 20 | /*! | ||
| 21 | * \ingroup Geometry | ||
| 22 | * \brief Create a vector normal to the given one (v is expected to be non-zero) | ||
| 23 | * \note This returns some orthogonal vector with arbitrary length | ||
| 24 | */ | ||
| 25 | template<class Vector> | ||
| 26 | 8060049 | inline Vector normal(const Vector& v) | |
| 27 | { | ||
| 28 | static_assert(Vector::size() > 1, "normal expects a coordinate dimension > 1"); | ||
| 29 | |||
| 30 | if constexpr (Vector::size() == 2) | ||
| 31 | 2000240 | return Vector({-v[1], v[0]}); | |
| 32 | |||
| 33 |
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14449946 | const auto it = std::find_if(v.begin(), v.end(), [](const auto& x) { return Dune::FloatCmp::ne(x, 0.0); }); |
| 34 |
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6059809 | const auto index = std::distance(v.begin(), it); |
| 35 |
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6059809 | if (index != Vector::size()-1) |
| 36 | { | ||
| 37 | 5590332 | Vector normal(0.0); | |
| 38 | 5590332 | normal[index] = -v[index+1]; | |
| 39 | 5590332 | normal[index+1] = v[index]; | |
| 40 | 5590332 | return normal; | |
| 41 | } | ||
| 42 | else | ||
| 43 | { | ||
| 44 | 469477 | Vector normal(0.0); | |
| 45 | 469477 | normal[index-1] = -v[index]; | |
| 46 | 469477 | normal[index] = v[index-1]; | |
| 47 | 469477 | return normal; | |
| 48 | |||
| 49 | } | ||
| 50 | } | ||
| 51 | |||
| 52 | /*! | ||
| 53 | * \ingroup Geometry | ||
| 54 | * \brief Create a vector normal to the given one (v is expected to be non-zero) | ||
| 55 | * \note This returns some orthogonal vector with unit length | ||
| 56 | */ | ||
| 57 | template<class Vector> | ||
| 58 | 59569 | inline Vector unitNormal(const Vector& v) | |
| 59 | { | ||
| 60 | 59569 | auto normal = Dumux::normal(v); | |
| 61 | 59569 | normal /= normal.two_norm(); | |
| 62 | 59569 | return normal; | |
| 63 | } | ||
| 64 | |||
| 65 | } // end namespace Dumux | ||
| 66 | |||
| 67 | #endif | ||
| 68 |