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35 lines
1.2 KiB
C++
35 lines
1.2 KiB
C++
// This file is part of libigl, a simple c++ geometry processing library.
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//
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// Copyright (C) 2015 Alec Jacobson <alecjacobson@gmail.com>
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//
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// This Source Code Form is subject to the terms of the Mozilla Public License
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// v. 2.0. If a copy of the MPL was not distributed with this file, You can
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// obtain one at http://mozilla.org/MPL/2.0/.
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#ifndef SORT_ANGLES_H
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#define SORT_ANGLES_H
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#include "igl_inline.h"
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#include <Eigen/Core>
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namespace igl {
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// Sort angles in ascending order in a numerically robust way.
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//
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// Instead of computing angles using atan2(y, x), sort directly on (y, x).
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//
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// Inputs:
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// M: m by n matrix of scalars. (n >= 2). Assuming the first column of M
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// contains values for y, and the second column is x. Using the rest
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// of the columns as tie-breaker.
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// R: an array of m indices. M.row(R[i]) contains the i-th smallest
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// angle.
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template<typename DerivedM, typename DerivedR>
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IGL_INLINE void sort_angles(
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const Eigen::PlainObjectBase<DerivedM>& M,
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Eigen::PlainObjectBase<DerivedR>& R);
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}
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#ifndef IGL_STATIC_LIBRARY
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#include "sort_angles.cpp"
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#endif
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#endif
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