| 1 | // This file is part of Eigen, a lightweight C++ template library
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| 2 | // for linear algebra.
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| 3 | //
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| 4 | // Copyright (C) 2008-2009 Gael Guennebaud <gael.guennebaud@inria.fr>
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| 5 | // Copyright (C) 2006-2008 Benoit Jacob <jacob.benoit.1@gmail.com>
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| 6 | //
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| 7 | // This Source Code Form is subject to the terms of the Mozilla
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| 8 | // Public License v. 2.0. If a copy of the MPL was not distributed
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| 9 | // with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
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| 10 |
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| 11 | #ifndef EIGEN_BLOCK2_H
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| 12 | #define EIGEN_BLOCK2_H
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| 13 |
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| 14 | namespace Eigen {
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| 15 |
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| 16 | /** \returns a dynamic-size expression of a corner of *this.
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| 17 | *
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| 18 | * \param type the type of corner. Can be \a Eigen::TopLeft, \a Eigen::TopRight,
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| 19 | * \a Eigen::BottomLeft, \a Eigen::BottomRight.
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| 20 | * \param cRows the number of rows in the corner
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| 21 | * \param cCols the number of columns in the corner
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| 22 | *
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| 23 | * Example: \include MatrixBase_corner_enum_int_int.cpp
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| 24 | * Output: \verbinclude MatrixBase_corner_enum_int_int.out
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| 25 | *
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| 26 | * \note Even though the returned expression has dynamic size, in the case
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| 27 | * when it is applied to a fixed-size matrix, it inherits a fixed maximal size,
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| 28 | * which means that evaluating it does not cause a dynamic memory allocation.
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| 29 | *
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| 30 | * \sa class Block, block(Index,Index,Index,Index)
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| 31 | */
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| 32 | template<typename Derived>
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| 33 | inline Block<Derived> DenseBase<Derived>
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| 34 | ::corner(CornerType type, Index cRows, Index cCols)
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| 35 | {
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| 36 | switch(type)
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| 37 | {
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| 38 | default:
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| 39 | eigen_assert(false && "Bad corner type.");
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| 40 | case TopLeft:
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| 41 | return Block<Derived>(derived(), 0, 0, cRows, cCols);
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| 42 | case TopRight:
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| 43 | return Block<Derived>(derived(), 0, cols() - cCols, cRows, cCols);
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| 44 | case BottomLeft:
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| 45 | return Block<Derived>(derived(), rows() - cRows, 0, cRows, cCols);
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| 46 | case BottomRight:
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| 47 | return Block<Derived>(derived(), rows() - cRows, cols() - cCols, cRows, cCols);
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| 48 | }
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| 49 | }
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| 50 |
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| 51 | /** This is the const version of corner(CornerType, Index, Index).*/
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| 52 | template<typename Derived>
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| 53 | inline const Block<Derived>
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| 54 | DenseBase<Derived>::corner(CornerType type, Index cRows, Index cCols) const
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| 55 | {
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| 56 | switch(type)
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| 57 | {
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| 58 | default:
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| 59 | eigen_assert(false && "Bad corner type.");
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| 60 | case TopLeft:
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| 61 | return Block<Derived>(derived(), 0, 0, cRows, cCols);
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| 62 | case TopRight:
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| 63 | return Block<Derived>(derived(), 0, cols() - cCols, cRows, cCols);
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| 64 | case BottomLeft:
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| 65 | return Block<Derived>(derived(), rows() - cRows, 0, cRows, cCols);
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| 66 | case BottomRight:
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| 67 | return Block<Derived>(derived(), rows() - cRows, cols() - cCols, cRows, cCols);
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| 68 | }
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| 69 | }
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| 70 |
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| 71 | /** \returns a fixed-size expression of a corner of *this.
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| 72 | *
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| 73 | * \param type the type of corner. Can be \a Eigen::TopLeft, \a Eigen::TopRight,
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| 74 | * \a Eigen::BottomLeft, \a Eigen::BottomRight.
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| 75 | *
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| 76 | * The template parameters CRows and CCols arethe number of rows and columns in the corner.
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| 77 | *
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| 78 | * Example: \include MatrixBase_template_int_int_corner_enum.cpp
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| 79 | * Output: \verbinclude MatrixBase_template_int_int_corner_enum.out
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| 80 | *
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| 81 | * \sa class Block, block(Index,Index,Index,Index)
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| 82 | */
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| 83 | template<typename Derived>
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| 84 | template<int CRows, int CCols>
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| 85 | inline Block<Derived, CRows, CCols>
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| 86 | DenseBase<Derived>::corner(CornerType type)
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| 87 | {
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| 88 | switch(type)
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| 89 | {
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| 90 | default:
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| 91 | eigen_assert(false && "Bad corner type.");
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| 92 | case TopLeft:
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| 93 | return Block<Derived, CRows, CCols>(derived(), 0, 0);
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| 94 | case TopRight:
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| 95 | return Block<Derived, CRows, CCols>(derived(), 0, cols() - CCols);
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| 96 | case BottomLeft:
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| 97 | return Block<Derived, CRows, CCols>(derived(), rows() - CRows, 0);
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| 98 | case BottomRight:
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| 99 | return Block<Derived, CRows, CCols>(derived(), rows() - CRows, cols() - CCols);
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| 100 | }
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| 101 | }
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| 102 |
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| 103 | /** This is the const version of corner<int, int>(CornerType).*/
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| 104 | template<typename Derived>
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| 105 | template<int CRows, int CCols>
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| 106 | inline const Block<Derived, CRows, CCols>
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| 107 | DenseBase<Derived>::corner(CornerType type) const
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| 108 | {
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| 109 | switch(type)
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| 110 | {
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| 111 | default:
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| 112 | eigen_assert(false && "Bad corner type.");
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| 113 | case TopLeft:
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| 114 | return Block<Derived, CRows, CCols>(derived(), 0, 0);
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| 115 | case TopRight:
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| 116 | return Block<Derived, CRows, CCols>(derived(), 0, cols() - CCols);
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| 117 | case BottomLeft:
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| 118 | return Block<Derived, CRows, CCols>(derived(), rows() - CRows, 0);
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| 119 | case BottomRight:
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| 120 | return Block<Derived, CRows, CCols>(derived(), rows() - CRows, cols() - CCols);
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| 121 | }
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| 122 | }
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| 123 |
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| 124 | } // end namespace Eigen
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| 125 |
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| 126 | #endif // EIGEN_BLOCK2_H
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