vector2d.h

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/*
 * This program source code file is part of KICAD, a free EDA CAD application.
 *
 * Copyright (C) 2010 Virtenio GmbH, Torsten Hueter, torsten.hueter <at> virtenio.de
 * Copyright (C) 2012 SoftPLC Corporation, Dick Hollenbeck <[email protected]>
 * Copyright (C) 2012-2021 KiCad Developers, see AUTHORS.txt for contributors.
 * Copyright (C) 2013 CERN
 * @author Tomasz Wlostowski <[email protected]>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, you may find one here:
 * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
 * or you may search the http://www.gnu.org website for the version 2 license,
 * or you may write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
 */
 
#ifndef VECTOR2D_H_
#define VECTOR2D_H_
 
#include <limits>
#include <iostream>
#include <sstream>
#include <type_traits>
 
#include <math/util.h>
 
template <class T>
struct VECTOR2_TRAITS
{
 typedef T extended_type;
};
 
template <>
struct VECTOR2_TRAITS<int>
{
 typedef int64_t extended_type;
};
 
// Forward declarations for template friends
template <class T>
class VECTOR2;
template <class T>
std::ostream& operator<<( std::ostream& aStream, const VECTOR2<T>& aVector );
 
template <class T = int>
class VECTOR2
{
public:
 typedef typename VECTOR2_TRAITS<T>::extended_type extended_type;
 typedef T coord_type;
 
 static constexpr extended_type ECOORD_MAX = std::numeric_limits<extended_type>::max();
 static constexpr extended_type ECOORD_MIN = std::numeric_limits<extended_type>::min();
 
 T x, y;
 
 VECTOR2();
 
 VECTOR2( T x, T y );
 
 template <typename CastingType>
 VECTOR2( const VECTOR2<CastingType>& aVec )
 {
 if( std::is_same<T, int>::value )
 {
 CastingType minI = static_cast<CastingType>( std::numeric_limits<int>::min() );
 CastingType maxI = static_cast<CastingType>( std::numeric_limits<int>::max() );
 
 x = static_cast<int>( Clamp( minI, aVec.x, maxI ) );
 y = static_cast<int>( Clamp( minI, aVec.y, maxI ) );
 }
 else
 {
 x = static_cast<T>( aVec.x );
 y = static_cast<T>( aVec.y );
 }
 }
 
 VECTOR2( const VECTOR2<T>& aVec )
 {
 x = aVec.x;
 y = aVec.y;
 }
 
 template <typename CastedType>
 VECTOR2<CastedType> operator()() const
 {
 if( std::is_same<CastedType, int>::value )
 {
 T minI = static_cast<T>( std::numeric_limits<int>::min() );
 T maxI = static_cast<T>( std::numeric_limits<int>::max() );
 
 return VECTOR2<int>( static_cast<int>( Clamp( minI, x, maxI ) ),
 static_cast<int>( Clamp( minI, y, maxI ) ) );
 }
 else
 {
 return VECTOR2<CastedType>( static_cast<CastedType>( x ), static_cast<CastedType>( y ) );
 }
 }
 
 // virtual ~VECTOR2();
 
 T EuclideanNorm() const;
 
 extended_type SquaredEuclideanNorm() const;
 
 
 VECTOR2<T> Perpendicular() const;
 
 VECTOR2<T> Resize( T aNewLength ) const;
 
 const std::string Format() const;
 
 extended_type Cross( const VECTOR2<T>& aVector ) const;
 
 extended_type Dot( const VECTOR2<T>& aVector ) const;
 
 
 // Operators
 
 VECTOR2<T>& operator=( const VECTOR2<T>& aVector );
 
 VECTOR2<T> operator+( const VECTOR2<T>& aVector ) const;
 
 VECTOR2<T> operator+( const T& aScalar ) const;
 
 VECTOR2<T>& operator+=( const VECTOR2<T>& aVector );
 
 VECTOR2<T>& operator*=( const VECTOR2<T>& aVector );
 
 VECTOR2<T>& operator*=( const T& aScalar );
 
 VECTOR2<T>& operator+=( const T& aScalar );
 
 VECTOR2<T> operator-( const VECTOR2<T>& aVector ) const;
 
 VECTOR2<T> operator-( const T& aScalar ) const;
 
 VECTOR2<T>& operator-=( const VECTOR2<T>& aVector );
 
 VECTOR2<T>& operator-=( const T& aScalar );
 
 VECTOR2<T> operator-();
 
 extended_type operator*( const VECTOR2<T>& aVector ) const;
 
 VECTOR2<T> operator*( const T& aFactor ) const;
 
 VECTOR2<T> operator/( double aFactor ) const;
 
 bool operator==( const VECTOR2<T>& aVector ) const;
 
 bool operator!=( const VECTOR2<T>& aVector ) const;
 
 bool operator<( const VECTOR2<T>& aVector ) const;
 bool operator<=( const VECTOR2<T>& aVector ) const;
 
 bool operator>( const VECTOR2<T>& aVector ) const;
 bool operator>=( const VECTOR2<T>& aVector ) const;
};
 
 
// ----------------------
// --- Implementation ---
// ----------------------
 
template <class T>
VECTOR2<T>::VECTOR2() : x{}, y{}
{
}
 
 
template <class T>
VECTOR2<T>::VECTOR2( T aX, T aY )
{
 x = aX;
 y = aY;
}
 
 
template <class T>
T VECTOR2<T>::EuclideanNorm() const
{
 // 45° are common in KiCad, so we can optimize the calculation
 if( std::abs( x ) == std::abs( y ) )
 return static_cast<T>( std::abs( x ) * M_SQRT2 );
 
 return static_cast<T>( sqrt( (extended_type) x * x + (extended_type) y * y ) );
}
 
 
template <class T>
typename VECTOR2<T>::extended_type VECTOR2<T>::SquaredEuclideanNorm() const
{
 return (extended_type) x * x + (extended_type) y * y;
}
 
 
template <class T>
VECTOR2<T> VECTOR2<T>::Perpendicular() const
{
 VECTOR2<T> perpendicular( -y, x );
 return perpendicular;
}
 
 
template <class T>
VECTOR2<T>& VECTOR2<T>::operator=( const VECTOR2<T>& aVector )
{
 x = aVector.x;
 y = aVector.y;
 return *this;
}
 
 
template <class T>
VECTOR2<T>& VECTOR2<T>::operator+=( const VECTOR2<T>& aVector )
{
 x += aVector.x;
 y += aVector.y;
 return *this;
}
 
 
template <class T>
VECTOR2<T>& VECTOR2<T>::operator*=( const VECTOR2<T>& aVector )
{
 x *= aVector.x;
 y *= aVector.y;
 return *this;
}
 
 
template <class T>
VECTOR2<T>& VECTOR2<T>::operator*=( const T& aScalar )
{
 x *= aScalar;
 y *= aScalar;
 return *this;
}
 
 
template <class T>
VECTOR2<T>& VECTOR2<T>::operator+=( const T& aScalar )
{
 x += aScalar;
 y += aScalar;
 return *this;
}
 
 
template <class T>
VECTOR2<T>& VECTOR2<T>::operator-=( const VECTOR2<T>& aVector )
{
 x -= aVector.x;
 y -= aVector.y;
 return *this;
}
 
 
template <class T>
VECTOR2<T>& VECTOR2<T>::operator-=( const T& aScalar )
{
 x -= aScalar;
 y -= aScalar;
 return *this;
}
 
 
template <class T>
VECTOR2<T> VECTOR2<T>::Resize( T aNewLength ) const
{
 if( x == 0 && y == 0 )
 return VECTOR2<T> ( 0, 0 );
 
 double newX;
 double newY;
 
 if( std::abs( x ) == std::abs( y ) )
 {
 newX = newY = std::abs( aNewLength ) * M_SQRT1_2;
 }
 else
 {
 extended_type x_sq = (extended_type) x * x;
 extended_type y_sq = (extended_type) y * y;
 extended_type l_sq = x_sq + y_sq;
 extended_type newLength_sq = (extended_type) aNewLength * aNewLength;
 newX = std::sqrt( rescale( newLength_sq, x_sq, l_sq ) );
 newY = std::sqrt( rescale( newLength_sq, y_sq, l_sq ) );
 }
 
 if( std::is_integral<T>::value )
 {
 return VECTOR2<T>( static_cast<T>( x < 0 ? -KiROUND( newX ) : KiROUND( newX ) ),
 static_cast<T>( y < 0 ? -KiROUND( newY ) : KiROUND( newY ) ) )
 * sign( aNewLength );
 }
 else
 {
 return VECTOR2<T>( static_cast<T>( x < 0 ? -newX : newX ),
 static_cast<T>( y < 0 ? -newY : newY ) )
 * sign( aNewLength );
 }
}
 
 
template <class T>
const std::string VECTOR2<T>::Format() const
{
 std::stringstream ss;
 
 ss << "( xy " << x << " " << y << " )";
 
 return ss.str();
}
 
 
template <class T>
VECTOR2<T> VECTOR2<T>::operator+( const VECTOR2<T>& aVector ) const
{
 return VECTOR2<T> ( x + aVector.x, y + aVector.y );
}
 
 
template <class T>
VECTOR2<T> VECTOR2<T>::operator+( const T& aScalar ) const
{
 return VECTOR2<T> ( x + aScalar, y + aScalar );
}
 
 
template <class T>
VECTOR2<T> VECTOR2<T>::operator-( const VECTOR2<T>& aVector ) const
{
 return VECTOR2<T> ( x - aVector.x, y - aVector.y );
}
 
 
template <class T>
VECTOR2<T> VECTOR2<T>::operator-( const T& aScalar ) const
{
 return VECTOR2<T> ( x - aScalar, y - aScalar );
}
 
 
template <class T>
VECTOR2<T> VECTOR2<T>::operator-()
{
 return VECTOR2<T> ( -x, -y );
}
 
 
template <class T>
typename VECTOR2<T>::extended_type VECTOR2<T>::operator*( const VECTOR2<T>& aVector ) const
{
 return (extended_type)aVector.x * x + (extended_type)aVector.y * y;
}
 
 
template <class T>
VECTOR2<T> VECTOR2<T>::operator*( const T& aFactor ) const
{
 VECTOR2<T> vector( x * aFactor, y * aFactor );
 return vector;
}
 
 
template <class T>
VECTOR2<T> VECTOR2<T>::operator/( double aFactor ) const
{
 if( std::is_integral<T>::value )
 return VECTOR2<T>( KiROUND( x / aFactor ), KiROUND( y / aFactor ) );
 else
 return VECTOR2<T>( static_cast<T>( x / aFactor ), static_cast<T>( y / aFactor ) );
}
 
 
template <class T>
VECTOR2<T> operator*( const T& aFactor, const VECTOR2<T>& aVector )
{
 VECTOR2<T> vector( aVector.x * aFactor, aVector.y * aFactor );
 return vector;
}
 
 
template <class T>
typename VECTOR2<T>::extended_type VECTOR2<T>::Cross( const VECTOR2<T>& aVector ) const
{
 return (extended_type) x * (extended_type) aVector.y -
 (extended_type) y * (extended_type) aVector.x;
}
 
 
template <class T>
typename VECTOR2<T>::extended_type VECTOR2<T>::Dot( const VECTOR2<T>& aVector ) const
{
 return (extended_type) x * (extended_type) aVector.x +
 (extended_type) y * (extended_type) aVector.y;
}
 
 
template <class T>
bool VECTOR2<T>::operator<( const VECTOR2<T>& aVector ) const
{
 return ( *this * *this ) < ( aVector * aVector );
}
 
 
template <class T>
bool VECTOR2<T>::operator<=( const VECTOR2<T>& aVector ) const
{
 return ( *this * *this ) <= ( aVector * aVector );
}
 
 
template <class T>
bool VECTOR2<T>::operator>( const VECTOR2<T>& aVector ) const
{
 return ( *this * *this ) > ( aVector * aVector );
}
 
 
template <class T>
bool VECTOR2<T>::operator>=( const VECTOR2<T>& aVector ) const
{
 return ( *this * *this ) >= ( aVector * aVector );
}
 
 
template <class T>
bool VECTOR2<T>::operator==( VECTOR2<T> const& aVector ) const
{
 return ( aVector.x == x ) && ( aVector.y == y );
}
 
 
template <class T>
bool VECTOR2<T>::operator!=( VECTOR2<T> const& aVector ) const
{
 return ( aVector.x != x ) || ( aVector.y != y );
}
 
 
template <class T>
const VECTOR2<T> LexicographicalMax( const VECTOR2<T>& aA, const VECTOR2<T>& aB )
{
 if( aA.x > aB.x )
 return aA;
 else if( aA.x == aB.x && aA.y > aB.y )
 return aA;
 
 return aB;
}
 
 
template <class T>
const VECTOR2<T> LexicographicalMin( const VECTOR2<T>& aA, const VECTOR2<T>& aB )
{
 if( aA.x < aB.x )
 return aA;
 else if( aA.x == aB.x && aA.y < aB.y )
 return aA;
 
 return aB;
}
 
 
template <class T>
int LexicographicalCompare( const VECTOR2<T>& aA, const VECTOR2<T>& aB )
{
 if( aA.x < aB.x )
 return -1;
 else if( aA.x > aB.x )
 return 1;
 else // aA.x == aB.x
 {
 if( aA.y < aB.y )
 return -1;
 else if( aA.y > aB.y )
 return 1;
 else
 return 0;
 }
}
 
 
template <class T>
typename std::enable_if<!std::numeric_limits<T>::is_integer, bool>::type
equals( VECTOR2<T> const& aFirst, VECTOR2<T> const& aSecond,
 T aEpsilon = std::numeric_limits<T>::epsilon() )
{
 if( !equals( aFirst.x, aSecond.x, aEpsilon ) )
 {
 return false;
 }
 
 return equals( aFirst.y, aSecond.y, aEpsilon );
}
 
 
template <class T>
std::ostream& operator<<( std::ostream& aStream, const VECTOR2<T>& aVector )
{
 aStream << "[ " << aVector.x << " | " << aVector.y << " ]";
 return aStream;
}
 
/* Default specializations */
typedef VECTOR2<double> VECTOR2D;
typedef VECTOR2<int> VECTOR2I;
typedef VECTOR2<long long int> VECTOR2L;
 
/* KiROUND specialization for vectors */
inline VECTOR2I KiROUND( const VECTOR2D& vec )
{
 return VECTOR2I( KiROUND( vec.x ), KiROUND( vec.y ) );
}
 
/* STL specializations */
namespace std
{
 // Required to enable correct use in std::map/unordered_map
 // DO NOT USE hash tables with VECTOR2 elements. It is inefficient
 // and degenerates to a linear search. Use the std::map/std::set
 // trees instead that utilize the less operator below
 // This function is purposely deleted after substantial testing
 template <>
 struct hash<VECTOR2I>
 {
 size_t operator()( const VECTOR2I& k ) const = delete;
 };
 
 // Required to enable use of std::hash with maps.
 template <>
 struct less<VECTOR2I>
 {
 bool operator()( const VECTOR2I& aA, const VECTOR2I& aB ) const;
 };
}
 
#endif // VECTOR2D_H_