1 #ifndef __DALI_MATRIX3_H__
2 #define __DALI_MATRIX3_H__
5 * Copyright (c) 2015 Samsung Electronics Co., Ltd.
7 * Licensed under the Apache License, Version 2.0 (the "License");
8 * you may not use this file except in compliance with the License.
9 * You may obtain a copy of the License at
11 * http://www.apache.org/licenses/LICENSE-2.0
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS,
15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the License for the specific language governing permissions and
17 * limitations under the License.
22 #include <dali/public-api/math/vector3.h>
23 #include <dali/public-api/math/matrix.h>
24 #include <dali/public-api/common/type-traits.h>
29 * @addtogroup dali_core_math
37 * @brief A 3x3 matrix.
41 class DALI_IMPORT_API Matrix3
45 friend std::ostream& operator<< (std::ostream& o, const Matrix3& matrix);
48 * @brief The identity matrix
50 static const Matrix3 IDENTITY;
59 * @brief Copy Constructor.
62 * @param[in] m A reference to the copied 3x3 matrix
64 Matrix3(const Matrix3& m);
70 * @param[in] m A 4x4 matrix. The translation and shear components are ignored.
72 Matrix3(const Matrix& m);
78 * @param[in] s00 First element
79 * @param[in] s01 Second element
80 * @param[in] s02 Third element
81 * @param[in] s10 Fourth element
82 * @param[in] s11 Fifth element
83 * @param[in] s12 Sixth element
84 * @param[in] s20 Seventh element
85 * @param[in] s21 Eighth element
86 * @param[in] s22 Ninth element
88 Matrix3(float s00, float s01, float s02, float s10, float s11, float s12, float s20, float s21, float s22);
91 * @brief Assignment Operator
93 * @param[in] matrix from which to copy values
94 * @return reference to this object
96 Matrix3& operator=( const Matrix3& matrix );
99 * @brief Assignment Operator
101 * @param[in] matrix A reference to the copied matrix
102 * @return A reference to this
104 Matrix3& operator=( const Matrix& matrix );
107 * @brief The equality operator.
109 * Utilises appropriate machine epsilon values.
112 * @param[in] rhs The Matrix to compare this to
113 * @return true if the matrices are equal
115 bool operator==(const Matrix3 & rhs) const;
118 * @brief The inequality operator.
120 * Utilises appropriate machine epsilon values.
123 * @param[in] rhs The Matrix to compare this to
124 * @return true if the matrices are equal
126 bool operator!=(const Matrix3 & rhs) const;
137 * @brief Sets the matrix to the identity matrix.
143 * @brief Returns the contents of the matrix as an array of 9 floats.
145 * The order of the values for a matrix is:
149 * xAxis.x yAxis.x zAxis.x
150 * xAxis.y yAxis.y zAxis.y
151 * xAxis.z yAxis.z zAxis.z
156 * @return the matrix contents as an array of 9 floats.
158 const float* AsFloat() const {return &mElements[0];}
161 * @brief Returns the contents of the matrix as an array of 9 floats.
165 * The order of the values for a matrix is:
166 * xAxis.x yAxis.x zAxis.x
167 * xAxis.y yAxis.y zAxis.y
168 * xAxis.z yAxis.z zAxis.z
173 * @return the matrix contents as an array of 9 floats.
175 float* AsFloat() {return &mElements[0];}
178 * @brief Inverts the matrix.
181 * @return true if successful
186 * @brief Swaps the rows to columns
188 * @return true if successful
193 * @brief Multiplies all elements of the matrix by the scale value.
196 * @param[in] scale The value by which to scale the whole matrix.
199 void Scale(float scale);
202 * @brief Magnitude returns the average of the absolute values of the
205 * (The Magnitude of the unit matrix is therefore 1)
207 * @return the magnitude - always positive.
209 float Magnitude() const;
212 * @brief If the matrix is invertible, then this method inverts, transposes
213 * and scales the matrix such that the resultant element values
216 * If the matrix is not invertible, then the matrix is left unchanged.
219 * @return true if the matrix is invertible, otherwise false
221 bool ScaledInverseTranspose();
224 * @brief Function to multiply two matrices and store the result onto third.
226 * Use this method in time critical path as it does not require temporaries
228 * @param[out] result Result of the multiplication
229 * @param[in] lhs Matrix, this can be same matrix as result
230 * @param[in] rhs Matrix, this cannot be same matrix as result
232 static void Multiply( Matrix3& result, const Matrix3& lhs, const Matrix3& rhs );
236 float mElements[9]; ///< The elements of the matrix
240 * @brief Print a 3x3 matrix.
243 * @param[in] o The output stream operator.
244 * @param[in] matrix The matrix to print.
245 * @return The output stream operator.
247 DALI_IMPORT_API std::ostream& operator<< (std::ostream& o, const Matrix3& matrix);
249 // Allow Matrix3 to be treated as a POD type
250 template <> struct TypeTraits< Matrix3 > : public BasicTypes< Matrix3 > { enum { IS_TRIVIAL_TYPE = true }; };
257 #endif //__DALI_MATRIX3_H__