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