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Add minimal version of GenTrap (Arb8) shape (celeritas-project#1171)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,111 @@ | ||
| //----------------------------------*-C++-*----------------------------------// | ||
| // Copyright 2024 UT-Battelle, LLC, and other Celeritas developers. | ||
| // See the top-level COPYRIGHT file for details. | ||
| // SPDX-License-Identifier: (Apache-2.0 OR MIT) | ||
| //---------------------------------------------------------------------------// | ||
| //! \file orange/orangeinp/detail/PolygonUtils.hh | ||
| //! \brief Utility standalone functions for polygons in 2D or 3D space. | ||
| //---------------------------------------------------------------------------// | ||
| #pragma once | ||
|
|
||
| #include <iostream> | ||
| #include <vector> | ||
|
|
||
| #include "corecel/cont/Array.hh" | ||
| #include "corecel/cont/Range.hh" | ||
| #include "corecel/cont/Span.hh" | ||
| #include "corecel/math/ArrayOperators.hh" | ||
| #include "corecel/math/ArrayUtils.hh" | ||
| #include "orange/OrangeTypes.hh" | ||
|
|
||
| namespace celeritas | ||
| { | ||
| namespace orangeinp | ||
| { | ||
| namespace detail | ||
| { | ||
| //---------------------------------------------------------------------------// | ||
| using Real2 = Array<real_type, 2>; | ||
|
|
||
| //---------------------------------------------------------------------------// | ||
| /*! | ||
| * Polygon orientation based on ordering of vertices. | ||
| */ | ||
| enum class Orientation | ||
| { | ||
| clockwise = -1, | ||
| collinear = 0, | ||
| counterclockwise = 1, | ||
| }; | ||
|
|
||
| //---------------------------------------------------------------------------// | ||
| // FREE FUNCTIONS | ||
| //---------------------------------------------------------------------------// | ||
| /*! | ||
| * Find orientation of ordered vertices in 2D coordinates. | ||
| */ | ||
| CELER_FORCEINLINE_FUNCTION Orientation orientation(Real2 const& a, | ||
| Real2 const& b, | ||
| Real2 const& c) | ||
| { | ||
| auto crossp = (b[0] - a[0]) * (c[1] - b[1]) - (b[1] - a[1]) * (c[0] - b[0]); | ||
| return crossp < 0 ? Orientation::clockwise | ||
| : crossp > 0 ? Orientation::counterclockwise | ||
| : Orientation::collinear; | ||
| } | ||
|
|
||
| //---------------------------------------------------------------------------// | ||
| /*! | ||
| * Check if a 2D polygon is convex. | ||
| * | ||
| * \param corners the vertices of the polygon | ||
| * \param degen_ok allow consecutive degenerate points | ||
| */ | ||
| CELER_FUNCTION bool | ||
| is_convex(Span<const Real2> const& corners, bool degen_ok = false) | ||
| { | ||
| CELER_EXPECT(!corners.empty()); | ||
| // The cross product of all vector pairs corresponding to ordered | ||
| // consecutive segments has to be positive. | ||
| auto crossp = [&](Real2 const& v1, Real2 const& v2) { | ||
| return v1[0] * v2[1] - v1[1] * v2[0]; | ||
| }; | ||
|
|
||
| // Use the cross_product(last, first) as sign reference | ||
| auto num_corners = corners.size(); | ||
| Real2 vec1 = corners[0] - corners[num_corners - 1]; | ||
| Real2 vec2 = corners[1] - corners[0]; | ||
| real_type const ref = crossp(vec1, vec2); | ||
| for (auto i : range(num_corners - 1)) | ||
| { | ||
| vec1 = vec2; | ||
| vec2 = corners[(i + 2) % num_corners] - corners[(i + 1) % num_corners]; | ||
| auto val = crossp(vec1, vec2); | ||
| // Make sure the sign is the same as the reference | ||
| if (val * ref < 0 || (!degen_ok && val == 0)) | ||
| { | ||
| return false; | ||
| } | ||
| } | ||
| return true; | ||
| } | ||
|
|
||
| //---------------------------------------------------------------------------// | ||
| /*! | ||
| * Check for coplanarity of four 3D polygon vertices. | ||
| */ | ||
| CELER_FUNCTION bool | ||
| is_planar(Real3 const& a, Real3 const& b, Real3 const& c, Real3 const& d) | ||
| { | ||
| // Use the cross_product(last, first) as sign reference | ||
| auto norm = make_unit_vector(cross_product(b - a, c - a)); | ||
| auto val = dot_product(norm, d - a); | ||
|
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||
| // FIXME: SoftEqual and SoftZero should have rel = abs | ||
| return SoftZero{SoftEqual<>{}.rel()}(val); | ||
| } | ||
|
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| //---------------------------------------------------------------------------// | ||
| } // namespace detail | ||
| } // namespace orangeinp | ||
| } // namespace celeritas |
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