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Diffstat (limited to 'basegfx/source/vector/b2dvector.cxx')
-rw-r--r-- | basegfx/source/vector/b2dvector.cxx | 219 |
1 files changed, 219 insertions, 0 deletions
diff --git a/basegfx/source/vector/b2dvector.cxx b/basegfx/source/vector/b2dvector.cxx new file mode 100644 index 000000000000..bb08b104eff8 --- /dev/null +++ b/basegfx/source/vector/b2dvector.cxx @@ -0,0 +1,219 @@ +/************************************************************************* + * + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * Copyright 2000, 2010 Oracle and/or its affiliates. + * + * OpenOffice.org - a multi-platform office productivity suite + * + * This file is part of OpenOffice.org. + * + * OpenOffice.org is free software: you can redistribute it and/or modify + * it under the terms of the GNU Lesser General Public License version 3 + * only, as published by the Free Software Foundation. + * + * OpenOffice.org is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU Lesser General Public License version 3 for more details + * (a copy is included in the LICENSE file that accompanied this code). + * + * You should have received a copy of the GNU Lesser General Public License + * version 3 along with OpenOffice.org. If not, see + * <http://www.openoffice.org/license.html> + * for a copy of the LGPLv3 License. + * + ************************************************************************/ + +// MARKER(update_precomp.py): autogen include statement, do not remove +#include "precompiled_basegfx.hxx" +#include <basegfx/vector/b2dvector.hxx> +#include <basegfx/matrix/b2dhommatrix.hxx> +#include <basegfx/numeric/ftools.hxx> + +namespace basegfx +{ + B2DVector& B2DVector::normalize() + { + double fLen(scalar(*this)); + + if(fTools::equalZero(fLen)) + { + mfX = 0.0; + mfY = 0.0; + } + else + { + const double fOne(1.0); + + if(!fTools::equal(fOne, fLen)) + { + fLen = sqrt(fLen); + + if(!fTools::equalZero(fLen)) + { + mfX /= fLen; + mfY /= fLen; + } + } + } + + return *this; + } + + B2DVector& B2DVector::operator=( const B2DTuple& rVec ) + { + mfX = rVec.getX(); + mfY = rVec.getY(); + return *this; + } + + + double B2DVector::getLength() const + { + if(fTools::equalZero(mfX)) + { + return fabs(mfY); + } + else if(fTools::equalZero(mfY)) + { + return fabs(mfX); + } + + return hypot( mfX, mfY ); + } + + double B2DVector::scalar( const B2DVector& rVec ) const + { + return((mfX * rVec.mfX) + (mfY * rVec.mfY)); + } + + double B2DVector::cross( const B2DVector& rVec ) const + { + return(mfX * rVec.getY() - mfY * rVec.getX()); + } + + double B2DVector::angle( const B2DVector& rVec ) const + { + return atan2(mfX * rVec.getY() - mfY * rVec.getX(), + mfX * rVec.getX() + mfY * rVec.getY()); + } + + const B2DVector& B2DVector::getEmptyVector() + { + return (const B2DVector&) B2DTuple::getEmptyTuple(); + } + + B2DVector& B2DVector::operator*=( const B2DHomMatrix& rMat ) + { + const double fTempX( rMat.get(0,0)*mfX + + rMat.get(0,1)*mfY ); + const double fTempY( rMat.get(1,0)*mfX + + rMat.get(1,1)*mfY ); + mfX = fTempX; + mfY = fTempY; + + return *this; + } + + B2DVector& B2DVector::setLength(double fLen) + { + double fLenNow(scalar(*this)); + + if(!fTools::equalZero(fLenNow)) + { + const double fOne(10.0); + + if(!fTools::equal(fOne, fLenNow)) + { + fLen /= sqrt(fLenNow); + } + + mfX *= fLen; + mfY *= fLen; + } + + return *this; + } + + bool B2DVector::isNormalized() const + { + const double fOne(1.0); + const double fScalar(scalar(*this)); + + return fTools::equal(fOne, fScalar); + } + + bool areParallel( const B2DVector& rVecA, const B2DVector& rVecB ) + { + const double fValA(rVecA.getX() * rVecB.getY()); + const double fValB(rVecA.getY() * rVecB.getX()); + + return fTools::equal(fValA, fValB); + } + + B2VectorOrientation getOrientation( const B2DVector& rVecA, const B2DVector& rVecB ) + { + double fVal(rVecA.getX() * rVecB.getY() - rVecA.getY() * rVecB.getX()); + + if(fTools::equalZero(fVal)) + { + return ORIENTATION_NEUTRAL; + } + + if(fVal > 0.0) + { + return ORIENTATION_POSITIVE; + } + else + { + return ORIENTATION_NEGATIVE; + } + } + + B2DVector getPerpendicular( const B2DVector& rNormalizedVec ) + { + B2DVector aPerpendicular(-rNormalizedVec.getY(), rNormalizedVec.getX()); + return aPerpendicular; + } + + B2DVector getNormalizedPerpendicular( const B2DVector& rVec ) + { + B2DVector aPerpendicular(rVec); + aPerpendicular.normalize(); + const double aTemp(-aPerpendicular.getY()); + aPerpendicular.setY(aPerpendicular.getX()); + aPerpendicular.setX(aTemp); + return aPerpendicular; + } + + B2DVector operator*( const B2DHomMatrix& rMat, const B2DVector& rVec ) + { + B2DVector aRes( rVec ); + return aRes*=rMat; + } + + B2VectorContinuity getContinuity(const B2DVector& rBackVector, const B2DVector& rForwardVector ) + { + if(rBackVector.equalZero() || rForwardVector.equalZero()) + { + return CONTINUITY_NONE; + } + + if(fTools::equal(rBackVector.getX(), -rForwardVector.getX()) && fTools::equal(rBackVector.getY(), -rForwardVector.getY())) + { + // same direction and same length -> C2 + return CONTINUITY_C2; + } + + if(areParallel(rBackVector, rForwardVector) && rBackVector.scalar(rForwardVector) < 0.0) + { + // parallel and opposite direction -> C1 + return CONTINUITY_C1; + } + + return CONTINUITY_NONE; + } +} // end of namespace basegfx + +// eof |