CSplineSegment.h

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// SPDX-License-Identifier: LGPL-2.1-or-later OR GPL-2.0-or-later OR GPL-3.0-or-later OR LicenseRef-ACF-Commercial
#pragma once
 
 
// ACF includes
#include <istd/IChangeable.h>
 
#include <i2d/CVector2d.h>
 
 
namespace i2d
{
 
 
class CSplineSegment: virtual public istd::IChangeable
{
public:
       virtual i2d::CVector2d GetPointInSegment(double position) const;
 
       virtual i2d::CVector2d GetDerivationInSegment(double position) const;
       
       virtual i2d::CVector2d GetDerivationBegin() const;
 
       virtual i2d::CVector2d GetDerivationEnd() const;
 
       virtual i2d::CVector2d GetPointBegin() const;
 
       virtual i2d::CVector2d GetPointEnd() const;
       
       virtual i2d::CVector2d GetBezierPointBegin() const;
       
       virtual i2d::CVector2d GetBezierPointEnd() const;
       
       virtual bool IsCloserThan(const i2d::CVector2d position, double distance) const;
       
       virtual void GetHalfSegmentFirst(CSplineSegment& result) const;
       
       virtual void GetHalfSegmentSecond(CSplineSegment& result) const;
 
       const i2d::CVector2d& A() const;
       void A(const i2d::CVector2d& value);
       const i2d::CVector2d& B() const;
       void B(const i2d::CVector2d& value);
       const i2d::CVector2d& C() const;
       void C(const i2d::CVector2d& value);
       const i2d::CVector2d& D() const;
       void D(const i2d::CVector2d& value);
 
       // reimplemented (istd::IChangeable)
       virtual int GetSupportedOperations() const override;
       virtual bool CopyFrom(const IChangeable& object, CompatibilityMode mode = CM_WITHOUT_REFS) override;
       virtual istd::TUniqueInterfacePtr<istd::IChangeable> CloneMe(CompatibilityMode mode = CM_WITHOUT_REFS) const override;
 
private:
       i2d::CVector2d m_a;
       i2d::CVector2d m_b;
       i2d::CVector2d m_c;
       i2d::CVector2d m_d;
};
 
 
inline i2d::CVector2d CSplineSegment::GetPointInSegment(double position) const
{
       return ((m_a * position + m_b) * position + m_c) * position + m_d;
}
 
 
inline i2d::CVector2d CSplineSegment::GetDerivationInSegment(double position) const
{
       return (m_a * (3 * position) + m_b * 2) * position + m_c;
}
 
 
inline i2d::CVector2d CSplineSegment::GetDerivationBegin() const
{
       return m_c;
}
 
 
inline i2d::CVector2d CSplineSegment::GetDerivationEnd() const
{
       return m_a * 3 + m_b * 2 + m_c;
}
 
 
inline i2d::CVector2d CSplineSegment::GetPointBegin() const
{
       return m_d;
}
 
 
inline i2d::CVector2d CSplineSegment::GetPointEnd() const
{
       return m_a + m_b + m_c + m_d;
}
 
 
inline i2d::CVector2d CSplineSegment::GetBezierPointBegin() const
{
       return m_d + m_c / 3;
}
 
 
inline i2d::CVector2d CSplineSegment::GetBezierPointEnd() const
{
       return m_c + m_d + (m_b - m_c) / 3;
}
 
 
inline void CSplineSegment::GetHalfSegmentFirst(CSplineSegment& result) const
{
       result.m_a = m_a * 0.125;
       result.m_b = m_b * 0.25;
       result.m_c = m_c * 0.5;
       result.m_d = m_d;
}
 
 
inline void CSplineSegment::GetHalfSegmentSecond(CSplineSegment& result) const
{
       result.m_a = m_a * 0.125;
       result.m_b = m_a * 0.375 + m_b * 0.25;
       result.m_c = m_a * 0.375 + (m_b + m_c) * 0.5;
       result.m_d = m_a * 0.125 + m_b * 0.25 + m_c * 0.5 + m_d;
}
 
 
// acces to members
 
inline const i2d::CVector2d& CSplineSegment::A() const
{
       return m_a;
}
 
 
inline void CSplineSegment::A(const i2d::CVector2d& value)
{
       m_a = value;
}
 
 
inline const i2d::CVector2d& CSplineSegment::B() const
{
       return m_b;
}
 
 
inline void CSplineSegment::B(const i2d::CVector2d& value)
{
       m_b = value;
}
 
 
inline const i2d::CVector2d& CSplineSegment::C() const
{
       return m_c;
}
 
 
inline void CSplineSegment::C(const i2d::CVector2d& value)
{
       m_c = value;
}
 
 
inline const i2d::CVector2d& CSplineSegment::D() const
{
       return m_d;
}
 
 
inline void CSplineSegment::D(const i2d::CVector2d& value)
{
       m_d = value;
}
 
 
} // namespace i2d