eda_angle.h

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/*
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2021-2022 KiCad Developers, see AUTHORS.txt for contributors.
 *
 * 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 3 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, see <http://www.gnu.org/licenses/>.
 */
 
#ifndef EDA_ANGLE_H
#define EDA_ANGLE_H
 
#include <cassert>
#include <cmath>
#include <math/vector2d.h> // for VECTOR2I
 
 
enum EDA_ANGLE_T
{
 TENTHS_OF_A_DEGREE_T,
 DEGREES_T,
 RADIANS_T
};
 
 
class EDA_ANGLE
{
public:
 EDA_ANGLE( double aValue, EDA_ANGLE_T aAngleType )
 {
 switch( aAngleType )
 {
 case RADIANS_T:
 m_value = aValue / DEGREES_TO_RADIANS;
 break;
 
 case TENTHS_OF_A_DEGREE_T:
 m_value = aValue / 10.0;
 break;
 
 default:
 m_value = aValue;
 }
 }
 
 explicit EDA_ANGLE( const VECTOR2D& aVector )
 {
 if( aVector.x == 0.0 && aVector.y == 0.0 )
 {
 m_value = 0.0;
 }
 else if( aVector.y == 0.0 )
 {
 if( aVector.x >= 0 )
 m_value = 0.0;
 else
 m_value = -180.0;
 }
 else if( aVector.x == 0.0 )
 {
 if( aVector.y >= 0.0 )
 m_value = 90.0;
 else
 m_value = -90.0;
 }
 else if( aVector.x == aVector.y )
 {
 if( aVector.x >= 0.0 )
 m_value = 45.0;
 else
 m_value = -180.0 + 45.0;
 }
 else if( aVector.x == -aVector.y )
 {
 if( aVector.x >= 0.0 )
 m_value = -45.0;
 else
 m_value = 180.0 - 45.0;
 }
 else
 {
 *this = EDA_ANGLE( atan2( aVector.y, aVector.x ), RADIANS_T );
 }
 }
 
 explicit EDA_ANGLE( const VECTOR2I& aVector )
 {
 /* gcc is surprisingly smart in optimizing these conditions in a tree! */
 
 if( aVector.x == 0 && aVector.y == 0 )
 {
 m_value = 0;
 }
 else if( aVector.y == 0 )
 {
 if( aVector.x >= 0 )
 m_value = 0.0;
 else
 m_value = -180.0;
 }
 else if( aVector.x == 0 )
 {
 if( aVector.y >= 0 )
 m_value = 90.0;
 else
 m_value = -90.0;
 }
 else if( aVector.x == aVector.y )
 {
 if( aVector.x >= 0 )
 m_value = 45.0;
 else
 m_value = -180.0 + 45.0;
 }
 else if( aVector.x == -aVector.y )
 {
 if( aVector.x >= 0 )
 m_value = -45.0;
 else
 m_value = 180.0 - 45.0;
 }
 else
 {
 *this = EDA_ANGLE( atan2( (double) aVector.y, (double) aVector.x ), RADIANS_T );
 }
 }
 
 EDA_ANGLE() :
 m_value( 0.0 )
 {}
 
 inline double AsDegrees() const { return m_value; }
 
 inline int AsTenthsOfADegree() const { return KiROUND( m_value * 10.0 ); }
 
 inline double AsRadians() const { return m_value * DEGREES_TO_RADIANS; }
 
 static constexpr double DEGREES_TO_RADIANS = M_PI / 180.0;
 
 bool IsCardinal() const;
 
 bool IsCardinal90() const;
 
 bool IsZero() const
 {
 return m_value == 0.0;
 }
 
 bool IsHorizontal() const
 {
 return m_value == 0.0 || m_value == 180.0;
 }
 
 bool IsVertical() const
 {
 return m_value == 90.0 || m_value == 270.0;
 }
 
 bool IsParallelTo( EDA_ANGLE aAngle ) const
 {
 EDA_ANGLE thisNormalized = *this;
 
 // Normalize90 is inclusive on both ends [-90, +90]
 // but we need it to be (-90, +90] for this test to work
 thisNormalized.Normalize90();
 if( thisNormalized.AsDegrees() == -90.0 )
 thisNormalized = EDA_ANGLE( 90.0, DEGREES_T );
 
 aAngle.Normalize90();
 if( aAngle.AsDegrees() == -90.0 )
 aAngle = EDA_ANGLE( 90.0, DEGREES_T );
 
 return ( thisNormalized.AsDegrees() == aAngle.AsDegrees() );
 }
 
 EDA_ANGLE Invert() const
 {
 return EDA_ANGLE( -AsDegrees(), DEGREES_T );
 }
 
 double Sin() const
 {
 EDA_ANGLE test = *this;
 test.Normalize();
 
 if( test.m_value == 0.0 || test.m_value == 180.0 )
 return 0.0;
 else if( test.m_value == 90.0 )
 return 1.0;
 else if( test.m_value == 270.0 )
 return -1.0;
 else
 return sin( AsRadians() );
 }
 
 double Cos() const
 {
 EDA_ANGLE test = *this;
 test.Normalize();
 
 if( test.m_value == 0.0 )
 return 1.0;
 else if( test.m_value == 180.0 )
 return -1.0;
 else if( test.m_value == 90.0 || test.m_value == 270.0 )
 return 0.0;
 else
 return cos( AsRadians() );
 }
 
 double Tan() const { return tan( AsRadians() ); }
 
 static EDA_ANGLE Arccos( double x ) { return EDA_ANGLE( acos( x ), RADIANS_T ); }
 
 static EDA_ANGLE Arcsin( double x ) { return EDA_ANGLE( asin( x ), RADIANS_T ); }
 
 static EDA_ANGLE Arctan( double x ) { return EDA_ANGLE( atan( x ), RADIANS_T ); }
 
 static EDA_ANGLE Arctan2( double y, double x )
 {
 return EDA_ANGLE( atan2( y, x ), RADIANS_T );
 }
 
 inline EDA_ANGLE Normalize()
 {
 while( m_value < -0.0 )
 m_value += 360.0;
 
 while( m_value >= 360.0 )
 m_value -= 360.0;
 
 return *this;
 }
 
 inline EDA_ANGLE Normalize90()
 {
 while( m_value < -90.0 )
 m_value += 180.0;
 
 while( m_value > 90.0 )
 m_value -= 180.0;
 
 return *this;
 }
 
 inline EDA_ANGLE Normalize180()
 {
 while( m_value <= -180.0 )
 m_value += 360.0;
 
 while( m_value > 180.0 )
 m_value -= 360.0;
 
 return *this;
 }
 
 inline EDA_ANGLE Normalize720()
 {
 while( m_value < -360.0 )
 m_value += 360.0;
 
 while( m_value >= 360.0 )
 m_value -= 360.0;
 
 return *this;
 }
 
 EDA_ANGLE KeepUpright() const;
 
 EDA_ANGLE& operator+=( const EDA_ANGLE& aAngle )
 {
 *this = EDA_ANGLE( AsDegrees() + aAngle.AsDegrees(), DEGREES_T );
 return *this;
 }
 
 EDA_ANGLE& operator-=( const EDA_ANGLE& aAngle )
 {
 *this = EDA_ANGLE( AsDegrees() - aAngle.AsDegrees(), DEGREES_T );
 return *this;
 }
 
private:
 double m_value; 
 
public:
 static EDA_ANGLE m_Angle0;
 static EDA_ANGLE m_Angle45;
 static EDA_ANGLE m_Angle90;
 static EDA_ANGLE m_Angle135;
 static EDA_ANGLE m_Angle180;
 static EDA_ANGLE m_Angle270;
 static EDA_ANGLE m_Angle360;
};
 
 
inline EDA_ANGLE operator-( const EDA_ANGLE& aAngle )
{
 return aAngle.Invert();
}
 
 
inline EDA_ANGLE operator-( const EDA_ANGLE& aAngleA, const EDA_ANGLE& aAngleB )
{
 return EDA_ANGLE( aAngleA.AsDegrees() - aAngleB.AsDegrees(), DEGREES_T );
}
 
 
inline EDA_ANGLE operator+( const EDA_ANGLE& aAngleA, const EDA_ANGLE& aAngleB )
{
 return EDA_ANGLE( aAngleA.AsDegrees() + aAngleB.AsDegrees(), DEGREES_T );
}
 
 
inline EDA_ANGLE operator*( const EDA_ANGLE& aAngleA, double aOperator )
{
 return EDA_ANGLE( aAngleA.AsDegrees() * aOperator, DEGREES_T );
}
 
 
inline EDA_ANGLE operator/( const EDA_ANGLE& aAngleA, double aOperator )
{
 return EDA_ANGLE( aAngleA.AsDegrees() / aOperator, DEGREES_T );
}
 
 
inline double operator/( const EDA_ANGLE& aAngleA, EDA_ANGLE& aOperator )
{
 return aAngleA.AsDegrees() / aOperator.AsDegrees();
}
 
 
inline bool operator==( const EDA_ANGLE& aAngleA, const EDA_ANGLE& aAngleB )
{
 return aAngleA.AsDegrees() == aAngleB.AsDegrees();
}
 
 
inline bool operator!=( const EDA_ANGLE& aAngleA, const EDA_ANGLE& aAngleB )
{
 return aAngleA.AsDegrees() != aAngleB.AsDegrees();
}
 
 
inline bool operator>( const EDA_ANGLE& aAngleA, const EDA_ANGLE& aAngleB )
{
 return aAngleA.AsDegrees() > aAngleB.AsDegrees();
}
 
 
inline bool operator<( const EDA_ANGLE& aAngleA, const EDA_ANGLE& aAngleB )
{
 return aAngleA.AsDegrees() < aAngleB.AsDegrees();
}
 
 
inline bool operator<=( const EDA_ANGLE& aAngleA, const EDA_ANGLE& aAngleB )
{
 return aAngleA.AsDegrees() <= aAngleB.AsDegrees();
}
 
 
inline bool operator>=( const EDA_ANGLE& aAngleA, const EDA_ANGLE& aAngleB )
{
 return aAngleA.AsDegrees() >= aAngleB.AsDegrees();
}
 
 
inline std::ostream& operator<<( std::ostream& aStream, const EDA_ANGLE& aAngle )
{
 return aStream << aAngle.AsDegrees();
}
 
 
namespace std
{
inline EDA_ANGLE abs( const EDA_ANGLE& aAngle )
{
 return EDA_ANGLE( std::abs( aAngle.AsDegrees() ), DEGREES_T );
}
}
 
 
static constexpr EDA_ANGLE& ANGLE_HORIZONTAL = EDA_ANGLE::m_Angle0;
static constexpr EDA_ANGLE& ANGLE_VERTICAL = EDA_ANGLE::m_Angle90;
static constexpr EDA_ANGLE& FULL_CIRCLE = EDA_ANGLE::m_Angle360;
 
static constexpr EDA_ANGLE& ANGLE_0 = EDA_ANGLE::m_Angle0;
static constexpr EDA_ANGLE& ANGLE_45 = EDA_ANGLE::m_Angle45;
static constexpr EDA_ANGLE& ANGLE_90 = EDA_ANGLE::m_Angle90;
static constexpr EDA_ANGLE& ANGLE_135 = EDA_ANGLE::m_Angle135;
static constexpr EDA_ANGLE& ANGLE_180 = EDA_ANGLE::m_Angle180;
static constexpr EDA_ANGLE& ANGLE_270 = EDA_ANGLE::m_Angle270;
static constexpr EDA_ANGLE& ANGLE_360 = EDA_ANGLE::m_Angle360;
 
 
#endif // EDA_ANGLE_H