pns_meander.h

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/*
 * KiRouter - a push-and-(sometimes-)shove PCB router
 *
 * Copyright (C) 2013-2015 CERN
 * Copyright (C) 2016-2021 KiCad Developers, see AUTHORS.txt for contributors.
 *
 * @author Tomasz Wlostowski <tomasz.wlostowski@cern.ch>
 *
 * 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 __PNS_MEANDER_H
#define __PNS_MEANDER_H

#include <math/vector2d.h>

#include <geometry/shape.h>
#include <geometry/shape_line_chain.h>

namespace PNS {

class MEANDER_PLACER_BASE;
class MEANDERED_LINE;

enum MEANDER_TYPE {
        MT_SINGLE,          // _|^|_, single-sided
        MT_START,           // _|^|
        MT_FINISH,          // |^|_
        MT_TURN,            // |^| or |_|
        MT_CHECK_START,     // try fitting a start type, but don't produce a line
        MT_CHECK_FINISH,    // try fitting a finish type, but don't produce a line
        MT_CORNER,          // line corner
        MT_EMPTY            // no meander (straight line)
};

enum MEANDER_STYLE {
    MEANDER_STYLE_ROUND = 1,          // rounded (90 degree arc)
    MEANDER_STYLE_CHAMFER             // chamfered (45 degree segment)
};

class MEANDER_SETTINGS
{
public:

    MEANDER_SETTINGS()
    {
        m_minAmplitude = 100000;
        m_maxAmplitude = 1000000;
        m_step = 50000;
        m_lenPadToDie = 0;
        m_spacing = 600000;
        m_targetLength = 100000000;
        m_targetSkew = 0;
        m_cornerStyle = MEANDER_STYLE_ROUND;
        m_cornerRadiusPercentage = 100;
        m_lengthTolerance = 100000;
        m_cornerArcSegments = 8;
    }

    int m_minAmplitude;
    int m_maxAmplitude;
    int m_spacing;
    int m_step;
    int m_lenPadToDie;
    long long int m_targetLength;
    MEANDER_STYLE m_cornerStyle;
    int m_cornerRadiusPercentage;
    int m_lengthTolerance;
    int m_cornerArcSegments;
    int m_targetSkew;
};

class MEANDER_SHAPE
{
public:
    MEANDER_SHAPE( MEANDER_PLACER_BASE* aPlacer, int aWidth, bool aIsDual = false ) :
        m_placer( aPlacer ),
        m_dual( aIsDual ),
        m_width( aWidth ),
        m_baselineOffset( 0 )
    {
        // Do not leave uninitialized members, and keep static analyzer quiet:
        m_type = MT_SINGLE;
        m_amplitude = 0;
        m_side = false;
        m_baseIndex = 0;
        m_currentTarget = NULL;
        m_meanCornerRadius = 0;
    }

    void SetType( MEANDER_TYPE aType )
    {
        m_type = aType;
    }

    MEANDER_TYPE Type() const
    {
        return m_type;
    }

    void SetBaseIndex( int aIndex )
    {
        m_baseIndex = aIndex;
    }

    int BaseIndex() const
    {
        return m_baseIndex;
    }

    int Amplitude() const
    {
        return m_amplitude;
    }

    void MakeCorner( VECTOR2I aP1, VECTOR2I aP2 = VECTOR2I( 0, 0 ) );

    void Resize( int aAmpl );

    void Recalculate();

    bool IsDual() const
    {
        return m_dual;
    }

    bool Side() const
    {
        return m_side;
    }

    VECTOR2I End() const
    {
        return m_clippedBaseSeg.B;
    }

    const SHAPE_LINE_CHAIN& CLine( int aShape ) const
    {
        return m_shapes[aShape];
    }

    void MakeEmpty();

    bool Fit( MEANDER_TYPE aType, const SEG& aSeg, const VECTOR2I& aP, bool aSide );

    const SEG& BaseSegment() const
    {
        return m_clippedBaseSeg;
    }

    int BaselineLength() const;

    int MaxTunableLength() const;

    const MEANDER_SETTINGS& Settings() const;

    int Width() const
    {
        return m_width;
    }

    void SetBaselineOffset( int aOffset )
    {
        m_baselineOffset = aOffset;
    }

private:
    friend class MEANDERED_LINE;

    void start( SHAPE_LINE_CHAIN* aTarget, const VECTOR2D& aWhere, const VECTOR2D& aDir );

    void forward( int aLength );

    void turn( int aAngle );

    void miter( int aRadius, bool aSide );

    void uShape( int aSides, int aCorner, int aTop );

    SHAPE_LINE_CHAIN makeMiterShape( VECTOR2D aP, VECTOR2D aDir, bool aSide );

    VECTOR2I reflect( VECTOR2I aP, const SEG& aLine );

    SHAPE_LINE_CHAIN genMeanderShape( VECTOR2D aP, VECTOR2D aDir, bool aSide, MEANDER_TYPE aType,
                                      int aAmpl, int aBaselineOffset = 0 );

    void updateBaseSegment();

    int cornerRadius() const;

    int spacing() const;

    MEANDER_TYPE m_type;

    MEANDER_PLACER_BASE* m_placer;

    bool m_dual;

    int m_width;

    int m_amplitude;

    int m_baselineOffset;

    int m_meanCornerRadius;

    VECTOR2I m_p0;

    SEG m_baseSeg;

    SEG m_clippedBaseSeg;

    bool m_side;

    SHAPE_LINE_CHAIN m_shapes[2];

    int m_baseIndex;

    VECTOR2D m_currentDir;

    VECTOR2D m_currentPos;

    SHAPE_LINE_CHAIN* m_currentTarget;
};


class MEANDERED_LINE
{
public:
    MEANDERED_LINE()
    {
        // Do not leave uninitialized members, and keep static analyzer quiet:
        m_placer = NULL;
        m_dual = false;
        m_width = 0;
        m_baselineOffset = 0;
    }

    MEANDERED_LINE( MEANDER_PLACER_BASE* aPlacer, bool aIsDual = false ) :
        m_placer( aPlacer ),
        m_dual( aIsDual )
    {
        // Do not leave uninitialized members, and keep static analyzer quiet:
        m_width = 0;
        m_baselineOffset = 0;
    }

    ~MEANDERED_LINE()
    {
        Clear();
    }

    void AddCorner( const VECTOR2I& aA, const VECTOR2I& aB = VECTOR2I( 0, 0 ) );

    void AddMeander( MEANDER_SHAPE* aShape );

    void Clear();

    void SetWidth( int aWidth )
    {
        m_width = aWidth;
    }

    void MeanderSegment( const SEG& aSeg, int aBaseIndex = 0 );

    void SetBaselineOffset( int aOffset )
    {
        m_baselineOffset = aOffset;
    }

    std::vector<MEANDER_SHAPE*>& Meanders()
    {
        return m_meanders;
    }

    bool CheckSelfIntersections( MEANDER_SHAPE* aShape, int aClearance );

    const MEANDER_SETTINGS& Settings() const;

private:
    VECTOR2I m_last;

    MEANDER_PLACER_BASE* m_placer;
    std::vector<MEANDER_SHAPE*> m_meanders;

    bool m_dual;
    int m_width;
    int m_baselineOffset;
};

}

#endif    // __PNS_MEANDER_H