AOO410/main/basegfx/source/vector/b2ivector.cxx

/**************************************************************
 * 
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 * 
 *************************************************************/



// MARKER(update_precomp.py): autogen include statement, do not remove
#include "precompiled_basegfx.hxx"
#include <basegfx/vector/b2ivector.hxx>
#include <basegfx/matrix/b2dhommatrix.hxx>
#include <basegfx/numeric/ftools.hxx>

namespace basegfx
{
	B2IVector& B2IVector::operator=( const ::basegfx::B2ITuple& rVec )
	{
		mnX = rVec.getX();
		mnY = rVec.getY();
		return *this;
	}


	double B2IVector::getLength() const
	{
		return hypot( mnX, mnY );
	}

	double B2IVector::scalar( const B2IVector& rVec ) const
	{
		return((mnX * rVec.mnX) + (mnY * rVec.mnY));
	}

	double B2IVector::cross( const B2IVector& rVec ) const
	{
		return(mnX * rVec.getY() - mnY * rVec.getX());
	}

	double B2IVector::angle( const B2IVector& rVec ) const
	{
		return atan2(double( mnX * rVec.getY() - mnY * rVec.getX()),
			double( mnX * rVec.getX() + mnY * rVec.getY()));
	}

	const B2IVector& B2IVector::getEmptyVector()
	{
		return (const B2IVector&) ::basegfx::B2ITuple::getEmptyTuple();
	}

	B2IVector& B2IVector::operator*=( const B2DHomMatrix& rMat )
	{
		mnX = fround( rMat.get(0,0)*mnX +
                      rMat.get(0,1)*mnY );
		mnY = fround( rMat.get(1,0)*mnX +
                      rMat.get(1,1)*mnY );

		return *this;
	}

	B2IVector& B2IVector::setLength(double fLen)
	{
		double fLenNow(scalar(*this));

		if(!::basegfx::fTools::equalZero(fLenNow))
		{
			const double fOne(10.0);

			if(!::basegfx::fTools::equal(fOne, fLenNow))
			{
				fLen /= sqrt(fLenNow);
			}

			mnX = fround( mnX*fLen );
			mnY = fround( mnY*fLen );
		}

		return *this;
	}

	bool areParallel( const B2IVector& rVecA, const B2IVector& rVecB )
	{
		double fVal(rVecA.getX() * rVecB.getY() - rVecA.getY() * rVecB.getX());
		return ::basegfx::fTools::equalZero(fVal);
	}

	B2VectorOrientation getOrientation( const B2IVector& rVecA, const B2IVector& rVecB )
	{
		double fVal(rVecA.getX() * rVecB.getY() - rVecA.getY() * rVecB.getX());

		if(fVal > 0.0)
		{
			return ORIENTATION_POSITIVE;
		}

		if(fVal < 0.0)
		{
			return ORIENTATION_NEGATIVE;
		}

		return ORIENTATION_NEUTRAL;
	}

	B2IVector getPerpendicular( const B2IVector& rNormalizedVec )
	{
		B2IVector aPerpendicular(-rNormalizedVec.getY(), rNormalizedVec.getX());
		return aPerpendicular;
	}

	B2IVector operator*( const B2DHomMatrix& rMat, const B2IVector& rVec )
	{
		B2IVector aRes( rVec );
		return aRes*=rMat;
	}

	B2VectorContinuity getContinuity(const B2IVector& rBackVector, const B2IVector& rForwardVector )
	{
		B2VectorContinuity eRetval(CONTINUITY_NONE);

		if(!rBackVector.equalZero() && !rForwardVector.equalZero())
		{
			const B2IVector aInverseForwardVector(-rForwardVector.getX(), -rForwardVector.getY());

			if(rBackVector == aInverseForwardVector)
			{
				// same direction and same length -> C2
				eRetval = CONTINUITY_C2;
			}
			else if(areParallel(rBackVector, aInverseForwardVector))
			{
				// same direction -> C1
				eRetval = CONTINUITY_C1;
			}
		}

		return eRetval;
	}
} // end of namespace basegfx

// eof