arc_chord_params.h

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/*
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright The 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 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.,
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 */
 
#ifndef ARC_CHORD_PARAMS_H
#define ARC_CHORD_PARAMS_H
 
#include <geometry/eda_angle.h>
#include <math/vector2d.h>

class ARC_CHORD_PARAMS
{
public:
    bool Compute( const VECTOR2I& aStart, const VECTOR2I& aMid, const VECTOR2I& aEnd );

    bool IsValid() const { return m_valid; }

    double GetChordLength() const { return m_chordLen; }

    double GetHalfChord() const { return m_halfChord; }

    VECTOR2D GetChordUnitVec() const { return VECTOR2D( m_ux, m_uy ); }

    VECTOR2D GetNormalUnitVec() const { return VECTOR2D( m_nx, m_ny ); }

    double GetSagitta() const { return m_sagitta; }

    double GetRadius() const { return m_radius; }

    double GetCenterOffset() const { return m_centerOffset; }

    VECTOR2D GetChordMidpoint() const { return VECTOR2D( m_midx, m_midy ); }

    VECTOR2D GetCenterPoint() const;

    EDA_ANGLE GetStartAngle() const;

    EDA_ANGLE GetEndAngle() const;

    double GetArcAngle() const;
 
    // Direct access to internal parameters for performance-critical code
    double GetUx() const { return m_ux; }
    double GetUy() const { return m_uy; }
    double GetNx() const { return m_nx; }
    double GetNy() const { return m_ny; }
    double GetMidX() const { return m_midx; }
    double GetMidY() const { return m_midy; }
 
private:
    double m_chordLen = 0.0;
    double m_halfChord = 0.0;
    double m_ux = 0.0, m_uy = 0.0;      
    double m_nx = 0.0, m_ny = 0.0;      
    double m_sagitta = 0.0;
    double m_radius = 0.0;
    double m_centerOffset = 0.0;        
    double m_midx = 0.0, m_midy = 0.0;  
    bool   m_valid = false;
};
 
#endif // ARC_CHORD_PARAMS_H