1 /************************************************************** 2 * 3 * Licensed to the Apache Software Foundation (ASF) under one 4 * or more contributor license agreements. See the NOTICE file 5 * distributed with this work for additional information 6 * regarding copyright ownership. The ASF licenses this file 7 * to you under the Apache License, Version 2.0 (the 8 * "License"); you may not use this file except in compliance 9 * with the License. You may obtain a copy of the License at 10 * 11 * http://www.apache.org/licenses/LICENSE-2.0 12 * 13 * Unless required by applicable law or agreed to in writing, 14 * software distributed under the License is distributed on an 15 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 16 * KIND, either express or implied. See the License for the 17 * specific language governing permissions and limitations 18 * under the License. 19 * 20 *************************************************************/ 21 22 23 24 #ifndef _BGFX_VECTOR_B2IVECTOR_HXX 25 #define _BGFX_VECTOR_B2IVECTOR_HXX 26 27 #include <basegfx/tuple/b2ituple.hxx> 28 #include <basegfx/vector/b2enums.hxx> 29 30 namespace basegfx 31 { 32 // predeclaration 33 class B2DHomMatrix; 34 35 /** Base Point class with two sal_Int32 values 36 37 This class derives all operators and common handling for 38 a 2D data class from B2ITuple. All necessary extensions 39 which are special for 2D Vectors are added here. 40 41 @see B2ITuple 42 */ 43 class B2IVector : public ::basegfx::B2ITuple 44 { 45 public: 46 /** Create a 2D Vector 47 48 The vector is initialized to (0, 0) 49 */ B2IVector()50 B2IVector() 51 : B2ITuple() 52 {} 53 54 /** Create a 2D Vector 55 56 @param nX 57 This parameter is used to initialize the X-coordinate 58 of the 2D Vector. 59 60 @param nY 61 This parameter is used to initialize the Y-coordinate 62 of the 2D Vector. 63 */ B2IVector(sal_Int32 nX,sal_Int32 nY)64 B2IVector(sal_Int32 nX, sal_Int32 nY) 65 : B2ITuple(nX, nY) 66 {} 67 68 /** Create a copy of a 2D Vector 69 70 @param rVec 71 The 2D Vector which will be copied. 72 */ B2IVector(const B2IVector & rVec)73 B2IVector(const B2IVector& rVec) 74 : B2ITuple(rVec) 75 {} 76 77 /** constructor with tuple to allow copy-constructing 78 from B2ITuple-based classes 79 */ B2IVector(const::basegfx::B2ITuple & rTuple)80 B2IVector(const ::basegfx::B2ITuple& rTuple) 81 : B2ITuple(rTuple) 82 {} 83 ~B2IVector()84 ~B2IVector() 85 {} 86 87 /** *=operator to allow usage from B2IVector, too 88 */ operator *=(const B2IVector & rPnt)89 B2IVector& operator*=( const B2IVector& rPnt ) 90 { 91 mnX *= rPnt.mnX; 92 mnY *= rPnt.mnY; 93 return *this; 94 } 95 96 /** *=operator to allow usage from B2IVector, too 97 */ operator *=(sal_Int32 t)98 B2IVector& operator*=(sal_Int32 t) 99 { 100 mnX *= t; 101 mnY *= t; 102 return *this; 103 } 104 105 /** assignment operator to allow assigning the results 106 of B2ITuple calculations 107 */ 108 B2IVector& operator=( const ::basegfx::B2ITuple& rVec ); 109 110 /** Calculate the length of this 2D Vector 111 112 @return The Length of the 2D Vector 113 */ 114 double getLength() const; 115 116 /** Set the length of this 2D Vector 117 118 @param fLen 119 The to be achieved length of the 2D Vector 120 */ 121 B2IVector& setLength(double fLen); 122 123 /** Calculate the Scalar with another 2D Vector 124 125 @param rVec 126 The second 2D Vector 127 128 @return 129 The Scalar value of the two involved 2D Vectors 130 */ 131 double scalar( const B2IVector& rVec ) const; 132 133 /** Calculate the length of the cross product with another 2D Vector 134 135 In 2D, returning an actual vector does not make much 136 sense here. The magnitude, although, can be readily 137 used for tasks such as angle calculations, since for 138 the returned value, the following equation holds: 139 retVal = getLength(this)*getLength(rVec)*sin(theta), 140 with theta being the angle between the two vectors. 141 142 @param rVec 143 The second 2D Vector 144 145 @return 146 The length of the cross product of the two involved 2D Vectors 147 */ 148 double cross( const B2IVector& rVec ) const; 149 150 /** Calculate the Angle with another 2D Vector 151 152 @param rVec 153 The second 2D Vector 154 155 @return 156 The Angle value of the two involved 2D Vectors in -pi/2 < return < pi/2 157 */ 158 double angle( const B2IVector& rVec ) const; 159 160 /** Transform vector by given transformation matrix. 161 162 Since this is a vector, translational components of the 163 matrix are disregarded. 164 */ 165 B2IVector& operator*=( const B2DHomMatrix& rMat ); 166 167 static const B2IVector& getEmptyVector(); 168 }; 169 170 // external operators 171 ////////////////////////////////////////////////////////////////////////// 172 173 /** Calculate the orientation to another 2D Vector 174 175 @param rVecA 176 The first 2D Vector 177 178 @param rVecB 179 The second 2D Vector 180 181 @return 182 The mathematical Orientation of the two involved 2D Vectors 183 */ 184 B2VectorOrientation getOrientation( const B2IVector& rVecA, const B2IVector& rVecB ); 185 186 /** Calculate a perpendicular 2D Vector to the given one 187 188 @param rVec 189 The source 2D Vector 190 191 @return 192 A 2D Vector perpendicular to the one given in parameter rVec 193 */ 194 B2IVector getPerpendicular( const B2IVector& rVec ); 195 196 /** Test two vectors which need not to be normalized for parallelism 197 198 @param rVecA 199 The first 2D Vector 200 201 @param rVecB 202 The second 2D Vector 203 204 @return 205 bool if the two values are parallel. Also true if 206 one of the vectors is empty. 207 */ 208 bool areParallel( const B2IVector& rVecA, const B2IVector& rVecB ); 209 210 /** Transform vector by given transformation matrix. 211 212 Since this is a vector, translational components of the 213 matrix are disregarded. 214 */ 215 B2IVector operator*( const B2DHomMatrix& rMat, const B2IVector& rVec ); 216 217 /** Test continuity between given vectors. 218 219 The two given vectors are assumed to describe control points on a 220 common point. Calculate if there is a continuity between them. 221 */ 222 B2VectorContinuity getContinuity( const B2IVector& rBackVector, const B2IVector& rForwardVector ); 223 224 } // end of namespace basegfx 225 226 #endif /* _BGFX_VECTOR_B2IVECTOR_HXX */ 227