office-gobmx/basegfx/source/vector/b2dvector.cxx

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/*************************************************************************
*
* $RCSfile: b2dvector.cxx,v $
*
* $Revision: 1.10 $
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*
* last change: $Author: aw $ $Date: 2004-01-16 14:30:10 $
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*
* The Contents of this file are made available subject to the terms of
* either of the following licenses
*
* - GNU Lesser General Public License Version 2.1
* - Sun Industry Standards Source License Version 1.1
*
* Sun Microsystems Inc., October, 2000
*
* GNU Lesser General Public License Version 2.1
* =============================================
* Copyright 2000 by Sun Microsystems, Inc.
* 901 San Antonio Road, Palo Alto, CA 94303, USA
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License version 2.1, as published by the Free Software Foundation.
*
* This library 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 for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*
*
* Sun Industry Standards Source License Version 1.1
* =================================================
* The contents of this file are subject to the Sun Industry Standards
* Source License Version 1.1 (the "License"); You may not use this file
* except in compliance with the License. You may obtain a copy of the
* License at http://www.openoffice.org/license.html.
*
* Software provided under this License is provided on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING,
* WITHOUT LIMITATION, WARRANTIES THAT THE SOFTWARE IS FREE OF DEFECTS,
* MERCHANTABLE, FIT FOR A PARTICULAR PURPOSE, OR NON-INFRINGING.
* See the License for the specific provisions governing your rights and
* obligations concerning the Software.
*
* The Initial Developer of the Original Code is: Sun Microsystems, Inc.
*
* Copyright: 2000 by Sun Microsystems, Inc.
*
* All Rights Reserved.
*
* Contributor(s): _______________________________________
*
*
************************************************************************/
#ifndef _BGFX_VECTOR_B2DVECTOR_HXX
#include <basegfx/vector/b2dvector.hxx>
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#endif
#ifndef _BGFX_MATRIX_B2DHOMMATRIX_HXX
#include <basegfx/matrix/b2dhommatrix.hxx>
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#endif
#ifndef _BGFX_NUMERIC_FTOOLS_HXX
#include <basegfx/numeric/ftools.hxx>
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#endif
namespace basegfx
{
B2DVector& B2DVector::normalize()
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{
double fLen(scalar(*this));
if(!::basegfx::fTools::equalZero(fLen))
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{
const double fOne(1.0);
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if(!::basegfx::fTools::equal(fOne, fLen))
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{
fLen = sqrt(fLen);
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if(!::basegfx::fTools::equalZero(fLen))
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{
mfX /= fLen;
mfY /= fLen;
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}
}
}
return *this;
}
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B2DVector& B2DVector::operator=( const ::basegfx::B2DTuple& rVec )
{
mfX = rVec.getX();
mfY = rVec.getY();
return *this;
}
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double B2DVector::getLength() const
{
return hypot( mfX, mfY );
}
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double B2DVector::scalar( const B2DVector& rVec ) const
{
return((mfX * rVec.mfX) + (mfY * rVec.mfY));
}
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double B2DVector::cross( const B2DVector& rVec ) const
{
return(mfX * rVec.getY() - mfY * rVec.getX());
}
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double B2DVector::angle( const B2DVector& rVec ) const
{
return atan2(mfX * rVec.getY() - mfY * rVec.getX(),
mfX * rVec.getX() + mfY * rVec.getY());
}
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const B2DVector& B2DVector::getEmptyVector()
{
return (const B2DVector&) ::basegfx::B2DTuple::getEmptyTuple();
}
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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;
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return *this;
}
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B2DVector& B2DVector::setLength(double fLen)
{
double fLenNow(scalar(*this));
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if(!::basegfx::fTools::equalZero(fLenNow))
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{
const double fOne(10.0);
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if(!::basegfx::fTools::equal(fOne, fLenNow))
{
fLen /= sqrt(fLenNow);
}
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mfX *= fLen;
mfY *= fLen;
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}
return *this;
}
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bool B2DVector::isNormalized() const
{
const double fOne(1.0);
const double fScalar(scalar(*this));
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return (::basegfx::fTools::equal(fOne, fScalar));
}
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bool areParallel( const B2DVector& rVecA, const B2DVector& rVecB )
{
double fVal(rVecA.getX() * rVecB.getY() - rVecA.getY() * rVecB.getX());
return ::basegfx::fTools::equalZero(fVal);
}
B2VectorOrientation getOrientation( const B2DVector& rVecA, const B2DVector& rVecB )
{
double fVal(rVecA.getX() * rVecB.getY() - rVecA.getY() * rVecB.getX());
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if(fVal > 0.0)
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{
return ORIENTATION_POSITIVE;
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}
if(fVal < 0.0)
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{
return ORIENTATION_NEGATIVE;
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}
return ORIENTATION_NEUTRAL;
}
B2DVector getPerpendicular( const B2DVector& rNormalizedVec )
{
B2DVector aPerpendicular(-rNormalizedVec.getY(), rNormalizedVec.getX());
return aPerpendicular;
}
B2DVector operator*( const ::basegfx::B2DHomMatrix& rMat, const B2DVector& rVec )
{
B2DVector aRes( rVec );
return aRes*=rMat;
}
B2VectorContinuity getContinuity(const B2DVector& rBackVector, const B2DVector& rForwardVector )
{
B2VectorContinuity eRetval(::basegfx::CONTINUITY_NONE);
if(!rBackVector.equalZero() && !rForwardVector.equalZero())
{
const B2DVector aInverseForwardVector(-rForwardVector.getX(), -rForwardVector.getY());
if(rBackVector.equal(aInverseForwardVector))
{
// same direction and same length -> C2
eRetval = ::basegfx::CONTINUITY_C2;
}
else if(areParallel(rBackVector, aInverseForwardVector))
{
// same direction -> C1
eRetval = ::basegfx::CONTINUITY_C1;
}
}
return eRetval;
}
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} // end of namespace basegfx
// eof