void OPENGL_GAL::DrawPolyline( std::deque<VECTOR2D>& aPointList )
{
    if( aPointList.empty() )
        return;

    currentManager->Color( strokeColor.r, strokeColor.g, strokeColor.b, strokeColor.a );

    std::deque<VECTOR2D>::const_iterator it = aPointList.begin();

    // Start from the second point
    for( ++it; it != aPointList.end(); ++it )
    {
        const VECTOR2D startEndVector = ( *it - *( it - 1 ) );
        double lineAngle = startEndVector.Angle();

        drawLineQuad( *( it - 1 ), *it );

        // There is no need to draw line caps on both ends of polyline's segments
        drawFilledSemiCircle( *( it - 1 ), lineWidth / 2, lineAngle + M_PI / 2 );
    }

    // ..and now - draw the ending cap
    const VECTOR2D startEndVector = ( *( it - 1 ) - *( it - 2 ) );
    double lineAngle = startEndVector.Angle();
    drawFilledSemiCircle( *( it - 1 ), lineWidth / 2, lineAngle - M_PI / 2 );
}

SHAPE_LINE_CHAIN PNS_MEANDER_SHAPE::circleQuad( VECTOR2D aP, VECTOR2D aDir, bool aSide )
{
    SHAPE_LINE_CHAIN lc;

    if( aDir.EuclideanNorm( ) == 0.0f )
    {
        lc.Append( aP );
        return lc;
    }

    VECTOR2D dir_u( aDir );
    VECTOR2D dir_v( aDir.Perpendicular( ) );

    const int ArcSegments = Settings().m_cornerArcSegments;

    for( int i = ArcSegments - 1; i >= 0; i-- )
    {
        VECTOR2D p;
        double alpha = (double) i / (double) ( ArcSegments - 1 ) * M_PI / 2.0;
        p = aP + dir_u * cos( alpha ) + dir_v * ( aSide ? -1.0 : 1.0 ) * ( 1.0 - sin( alpha ) );
        lc.Append( ( int ) p.x, ( int ) p.y );
    }

    return lc;
}

/**
 * Draw simple ticks on the back of a line such that the line is
 * divided into n parts.
 *
 * @param aGal the GAL to draw on
 * @param aOrigin start of line to draw ticks on
 * @param aLine line vector
 * @param aTickLen length of ticks in IU
 * @param aNumDivisions number of parts to divide the line into
 */
void drawBacksideTicks( KIGFX::GAL& aGal, const VECTOR2D& aOrigin,
        const VECTOR2D& aLine, double aTickLen, int aNumDivisions )
{
    const double backTickSpace = aLine.EuclideanNorm() / aNumDivisions;
    const auto backTickVec = aLine.Rotate( M_PI_2 ).Resize( aTickLen );

    for( int i = 0; i < aNumDivisions + 1; ++i )
    {
        const auto backTickPos = aOrigin + aLine.Resize( backTickSpace * i );
        aGal.DrawLine( backTickPos, backTickPos + backTickVec );
    }
}

bool SHAPE_ARC::ConstructFromCorners( VECTOR2I aP0, VECTOR2I aP1, double aCenterAngle )
{
    VECTOR2D mid = ( VECTOR2D( aP0 ) + VECTOR2D( aP1 ) ) * 0.5;
    VECTOR2D chord = VECTOR2D( aP1 ) - VECTOR2D( aP0 );
    double c = (aP1 - aP0).EuclideanNorm() / 2;
    VECTOR2D d = chord.Rotate( M_PI / 2.0 ).Resize( c );

    m_pc = mid + d * ( 1.0 / tan( aCenterAngle / 2.0 * M_PI / 180.0 ) );
    m_p0 = aP0;
    m_p1 = aP1;

    return true;
}

/**
 * Draw labelled ticks on a line. Ticks are spaced according to a
 * maximum density. Miror ticks are not labelled.
 *
 * @param aGal the GAL to draw on
 * @param aOrigin start of line to draw ticks on
 * @param aLine line vector
 * @param aMinorTickLen length of minor ticks in IU
 */
void drawTicksAlongLine( KIGFX::GAL& aGal, const VECTOR2D& aOrigin,
        const VECTOR2D& aLine, double aMinorTickLen )
{
    VECTOR2D tickLine = aLine.Rotate( -M_PI_2 );

    double tickSpace;
    TICK_FORMAT tickF = getTickFormatForScale( aGal.GetWorldScale(), tickSpace );

    // number of ticks in whole ruler
    int numTicks = (int) std::ceil( aLine.EuclideanNorm() / tickSpace );

    // work out which way up the tick labels go
    double labelAngle = -tickLine.Angle();

    if( aLine.Angle() > 0 )
    {
        aGal.SetHorizontalJustify( GR_TEXT_HJUSTIFY_LEFT );
    }
    else
    {
        aGal.SetHorizontalJustify( GR_TEXT_HJUSTIFY_RIGHT );
        labelAngle += M_PI;
    }

    // text and ticks are dimmed
    aGal.SetStrokeColor( PreviewOverlayDefaultColor().WithAlpha( PreviewOverlayDeemphAlpha( true ) ) );

    const auto labelOffset = tickLine.Resize( aMinorTickLen * ( majorTickLengthFactor + 1 ) );

    for( int i = 0; i < numTicks; ++i )
    {
        const auto tickPos = aOrigin + aLine.Resize( tickSpace * i );

        double length = aMinorTickLen;
        bool drawLabel = false;

        if( i % tickF.majorStep == 0)
        {
            drawLabel = true;
            length *= majorTickLengthFactor;
        }
        else if( tickF.midStep && i % tickF.midStep == 0 )
        {
            drawLabel = true;
            length *= midTickLengthFactor;
        }

        aGal.DrawLine( tickPos, tickPos + tickLine.Resize( length ) );

        if( drawLabel )
        {
            wxString label = DimensionLabel( "", tickSpace * i, g_UserUnit );

            // FIXME: spaces choke OpenGL lp:1668455
            label.erase( std::remove( label.begin(), label.end(), ' ' ), label.end() );

            aGal.BitmapText( label, tickPos + labelOffset, labelAngle );
        }
    }
}

void PNS_MEANDER_SHAPE::arc( int aRadius, bool aSide )
{
    if( aRadius <= 0 )
    {
        turn( aSide ? -90 : 90 );
        return;
    }

    VECTOR2D dir = m_currentDir.Resize( (double) aRadius );
    SHAPE_LINE_CHAIN arc = circleQuad( m_currentPos, dir, aSide );
    m_currentPos = arc.CPoint( -1 );
    m_currentDir = dir.Rotate( aSide ? -M_PI / 2.0 : M_PI / 2.0 );

    m_currentTarget->Append ( arc );
}

void OPENGL_GAL::DrawLine( const VECTOR2D& aStartPoint, const VECTOR2D& aEndPoint )
{
    const VECTOR2D  startEndVector = aEndPoint - aStartPoint;
    double          lineAngle = startEndVector.Angle();

    currentManager->Color( strokeColor.r, strokeColor.g, strokeColor.b, strokeColor.a );

    drawLineQuad( aStartPoint, aEndPoint );

    // Line caps
    if( lineWidth > 1.0 )
    {
        drawFilledSemiCircle( aStartPoint, lineWidth / 2, lineAngle + M_PI / 2 );
        drawFilledSemiCircle( aEndPoint,   lineWidth / 2, lineAngle - M_PI / 2 );
    }
}

SHAPE_LINE_CHAIN PNS_MEANDER_SHAPE::circleQuad( VECTOR2D aP, VECTOR2D aDir, bool aSide )
{
    SHAPE_LINE_CHAIN lc;

    if( aDir.EuclideanNorm( ) == 0.0f )
    {
        lc.Append( aP );
        return lc;
    }

    VECTOR2D dir_u( aDir );
    VECTOR2D dir_v( aDir.Perpendicular( ) );

    const int ArcSegments = Settings().m_cornerArcSegments;

    double radius = (double) aDir.EuclideanNorm();
    double angleStep = M_PI / 2.0 / (double) ArcSegments;

    double correction = 12.0 * radius * ( 1.0 - cos( angleStep / 2.0 ) );

    if( !m_dual )
        correction = 0.0;
    else if( radius < m_meanCornerRadius )
        correction = 0.0;

    VECTOR2D p = aP;
    lc.Append( ( int ) p.x, ( int ) p.y );

    VECTOR2D dir_uu = dir_u.Resize( radius - correction );
    VECTOR2D dir_vv = dir_v.Resize( radius - correction );

    VECTOR2D shift = dir_u.Resize( correction );

    for( int i = ArcSegments - 1; i >= 0; i-- )
    {
        double alpha = (double) i / (double) ( ArcSegments - 1 ) * M_PI / 2.0;
        p = aP + shift + dir_uu * cos( alpha ) + dir_vv * ( aSide ? -1.0 : 1.0 ) * ( 1.0 - sin( alpha ) );
        lc.Append( ( int ) p.x, ( int ) p.y );
    }

    p = aP + dir_u + dir_v * ( aSide ? -1.0 : 1.0 );
    lc.Append( ( int ) p.x, ( int ) p.y );

    return lc;
}

void OPENGL_GAL::DrawSegment( const VECTOR2D& aStartPoint, const VECTOR2D& aEndPoint,
                              double aWidth )
{
    VECTOR2D startEndVector = aEndPoint - aStartPoint;
    double   lineAngle      = startEndVector.Angle();

    if( isFillEnabled )
    {
        // Filled tracks
        currentManager->Color( fillColor.r, fillColor.g, fillColor.b, fillColor.a );

        SetLineWidth( aWidth );
        drawLineQuad( aStartPoint, aEndPoint );

        // Draw line caps
        drawFilledSemiCircle( aStartPoint, aWidth / 2, lineAngle + M_PI / 2 );
        drawFilledSemiCircle( aEndPoint,   aWidth / 2, lineAngle - M_PI / 2 );
    }
    else
    {
        // Outlined tracks
        double lineLength = startEndVector.EuclideanNorm();

        currentManager->Color( strokeColor.r, strokeColor.g, strokeColor.b, strokeColor.a );

        Save();

        currentManager->Translate( aStartPoint.x, aStartPoint.y, 0.0 );
        currentManager->Rotate( lineAngle, 0.0f, 0.0f, 1.0f );

        drawLineQuad( VECTOR2D( 0.0,         aWidth / 2.0 ),
                      VECTOR2D( lineLength,  aWidth / 2.0 ) );

        drawLineQuad( VECTOR2D( 0.0,        -aWidth / 2.0 ),
                      VECTOR2D( lineLength, -aWidth / 2.0 ) );

        // Draw line caps
        drawStrokedSemiCircle( VECTOR2D( 0.0, 0.0 ), aWidth / 2, M_PI / 2 );
        drawStrokedSemiCircle( VECTOR2D( lineLength, 0.0 ), aWidth / 2, -M_PI / 2 );

        Restore();
    }
}

static void drawCursorStrings( KIGFX::GAL& aGal, const VECTOR2D& aCursor,
    const VECTOR2D& aRulerVec )
{
    // draw the cursor labels
    std::vector<wxString> cursorStrings;

    cursorStrings.push_back( DimensionLabel( "r", aRulerVec.EuclideanNorm(), g_UserUnit ) );

    double degs = RAD2DECIDEG( -aRulerVec.Angle() );
    cursorStrings.push_back( DimensionLabel( "θ", degs, DEGREES ) );

    for( auto& str: cursorStrings )
    {
        // FIXME: remove spaces that choke OpenGL lp:1668455
        str.erase( std::remove( str.begin(), str.end(), ' ' ), str.end() );
    }

    auto temp = aRulerVec;
    DrawTextNextToCursor( aGal, aCursor, -temp, cursorStrings );
}

void CAIRO_GAL::DrawSegment( const VECTOR2D& aStartPoint, const VECTOR2D& aEndPoint,
                             double aWidth )
{
    if( isFillEnabled )
    {
        // Filled tracks mode
        SetLineWidth( aWidth );

        cairo_move_to( currentContext, (double) aStartPoint.x, (double) aStartPoint.y );
        cairo_line_to( currentContext, (double) aEndPoint.x, (double) aEndPoint.y );
    }
    else
    {
        // Outline mode for tracks
        VECTOR2D startEndVector = aEndPoint - aStartPoint;
        double   lineAngle      = atan2( startEndVector.y, startEndVector.x );
        double   lineLength     = startEndVector.EuclideanNorm();

        cairo_save( currentContext );

        cairo_translate( currentContext, aStartPoint.x, aStartPoint.y );
        cairo_rotate( currentContext, lineAngle );

        cairo_arc( currentContext, 0.0,        0.0, aWidth / 2.0,  M_PI / 2.0, 3.0 * M_PI / 2.0 );
        cairo_arc( currentContext, lineLength, 0.0, aWidth / 2.0, -M_PI / 2.0, M_PI / 2.0 );

        cairo_move_to( currentContext, 0.0,        aWidth / 2.0 );
        cairo_line_to( currentContext, lineLength, aWidth / 2.0 );

        cairo_move_to( currentContext, 0.0,        -aWidth / 2.0 );
        cairo_line_to( currentContext, lineLength, -aWidth / 2.0 );

        cairo_restore( currentContext );
    }

    isElementAdded = true;
}

void POINT_EDITOR::updateItem() const
{
    EDA_ITEM* item = m_editPoints->GetParent();

    switch( item->Type() )
    {
    case PCB_LINE_T:
    case PCB_MODULE_EDGE_T:
    {
        DRAWSEGMENT* segment = static_cast<DRAWSEGMENT*>( item );
        switch( segment->GetShape() )
        {
        case S_SEGMENT:
            if( isModified( m_editPoints->Point( SEG_START ) ) )
                segment->SetStart( wxPoint( m_editPoints->Point( SEG_START ).GetPosition().x,
                                            m_editPoints->Point( SEG_START ).GetPosition().y ) );

            else if( isModified( m_editPoints->Point( SEG_END ) ) )
                segment->SetEnd( wxPoint( m_editPoints->Point( SEG_END ).GetPosition().x,
                                          m_editPoints->Point( SEG_END ).GetPosition().y ) );

            break;

        case S_ARC:
        {
            const VECTOR2I& center = m_editPoints->Point( ARC_CENTER ).GetPosition();
            const VECTOR2I& start = m_editPoints->Point( ARC_START ).GetPosition();
            const VECTOR2I& end = m_editPoints->Point( ARC_END ).GetPosition();

            if( center != segment->GetCenter() )
            {
                wxPoint moveVector = wxPoint( center.x, center.y ) - segment->GetCenter();
                segment->Move( moveVector );

                m_editPoints->Point( ARC_START ).SetPosition( segment->GetArcStart() );
                m_editPoints->Point( ARC_END ).SetPosition( segment->GetArcEnd() );
            }

            else
            {
                segment->SetArcStart( wxPoint( start.x, start.y ) );

                VECTOR2D startLine = start - center;
                VECTOR2I endLine = end - center;
                double newAngle = RAD2DECIDEG( endLine.Angle() - startLine.Angle() );

                // Adjust the new angle to (counter)clockwise setting
                bool clockwise = ( segment->GetAngle() > 0 );

                if( clockwise && newAngle < 0.0 )
                    newAngle += 3600.0;
                else if( !clockwise && newAngle > 0.0 )
                    newAngle -= 3600.0;

                segment->SetAngle( newAngle );
            }

            break;
        }

        case S_CIRCLE:
        {
            const VECTOR2I& center = m_editPoints->Point( CIRC_CENTER ).GetPosition();
            const VECTOR2I& end = m_editPoints->Point( CIRC_END ).GetPosition();

            if( isModified( m_editPoints->Point( CIRC_CENTER ) ) )
            {
                wxPoint moveVector = wxPoint( center.x, center.y ) - segment->GetCenter();
                segment->Move( moveVector );
            }
            else
            {
                segment->SetEnd( wxPoint( end.x, end.y ) );
            }

            break;
        }

        default:        // suppress warnings
            break;
        }

        // Update relative coordinates for module edges
        if( EDGE_MODULE* edge = dyn_cast<EDGE_MODULE*>( item ) )
            edge->SetLocalCoord();

        break;
    }

    case PCB_ZONE_AREA_T:
    {
        ZONE_CONTAINER* zone = static_cast<ZONE_CONTAINER*>( item );
        zone->ClearFilledPolysList();
        CPolyLine* outline = zone->Outline();

        for( int i = 0; i < outline->GetCornersCount(); ++i )
        {
            VECTOR2I point = m_editPoints->Point( i ).GetPosition();
            outline->SetX( i, point.x );
            outline->SetY( i, point.y );
//.........这里部分代码省略.........

void PCB_PAINTER::draw( const TRACK* aTrack, int aLayer )
{
    VECTOR2D start( aTrack->GetStart() );
    VECTOR2D end( aTrack->GetEnd() );
    int      width = aTrack->GetWidth();

    if( m_pcbSettings.m_netNamesOnTracks && IsNetnameLayer( aLayer ) )
    {
        // If there is a net name - display it on the track
        if( aTrack->GetNetCode() > NETINFO_LIST::UNCONNECTED )
        {
            VECTOR2D line = ( end - start );
            double length = line.EuclideanNorm();

            // Check if the track is long enough to have a netname displayed
            if( length < 10 * width )
                return;

            const wxString& netName = aTrack->GetShortNetname();
            VECTOR2D textPosition = start + line / 2.0;     // center of the track

            double textOrientation;

            if( end.y == start.y ) // horizontal
                textOrientation = 0;
            else if( end.x == start.x ) // vertical
                textOrientation = M_PI / 2;
            else
                textOrientation = -atan( line.y / line.x );

            double textSize = width;

            m_gal->SetIsStroke( true );
            m_gal->SetIsFill( false );
            m_gal->SetStrokeColor( m_pcbSettings.GetColor( NULL, aLayer ) );
            m_gal->SetLineWidth( width / 10.0 );
            m_gal->SetFontBold( false );
            m_gal->SetFontItalic( false );
            m_gal->SetTextMirrored( false );
            m_gal->SetGlyphSize( VECTOR2D( textSize * 0.7, textSize * 0.7 ) );
            m_gal->SetHorizontalJustify( GR_TEXT_HJUSTIFY_CENTER );
            m_gal->SetVerticalJustify( GR_TEXT_VJUSTIFY_CENTER );
            m_gal->BitmapText( netName, textPosition, textOrientation );
        }
    }
    else if( IsCopperLayer( aLayer ) )
    {
        // Draw a regular track
        const COLOR4D& color = m_pcbSettings.GetColor( aTrack, aLayer );
        bool outline_mode = m_pcbSettings.m_sketchMode[LAYER_TRACKS];
        m_gal->SetStrokeColor( color );
        m_gal->SetFillColor( color );
        m_gal->SetIsStroke( outline_mode );
        m_gal->SetIsFill( not outline_mode );
        m_gal->SetLineWidth( m_pcbSettings.m_outlineWidth );

        m_gal->DrawSegment( start, end, width );

        // Clearance lines
        constexpr int clearanceFlags = PCB_RENDER_SETTINGS::CL_EXISTING | PCB_RENDER_SETTINGS::CL_TRACKS;

        if( ( m_pcbSettings.m_clearance & clearanceFlags ) == clearanceFlags )
        {
            m_gal->SetLineWidth( m_pcbSettings.m_outlineWidth );
            m_gal->SetIsFill( false );
            m_gal->SetIsStroke( true );
            m_gal->SetStrokeColor( color );
            m_gal->DrawSegment( start, end, width + aTrack->GetClearance() * 2 );
        }
    }
}

void PCB_PAINTER::draw( const TRACK* aTrack, int aLayer )
{
    VECTOR2D start( aTrack->GetStart() );
    VECTOR2D end( aTrack->GetEnd() );
    int      width = aTrack->GetWidth();

    if( m_pcbSettings.m_netNamesOnTracks && IsNetnameLayer( aLayer ) )
    {
        // If there is a net name - display it on the track
        if( aTrack->GetNetCode() > NETINFO_LIST::UNCONNECTED )
        {
            VECTOR2D line = ( end - start );
            double length = line.EuclideanNorm();

            // Check if the track is long enough to have a netname displayed
            if( length < 10 * width )
                return;

            const wxString& netName = aTrack->GetShortNetname();
            VECTOR2D textPosition = start + line / 2.0;     // center of the track
            double textOrientation = -atan( line.y / line.x );
            double textSize = std::min( static_cast<double>( width ), length / netName.length() );

            // Set a proper color for the label
            const COLOR4D& color = m_pcbSettings.GetColor( aTrack, aTrack->GetLayer() );
            COLOR4D labelColor = m_pcbSettings.GetColor( NULL, aLayer );

            if( color.GetBrightness() > 0.5 )
                m_gal->SetStrokeColor( labelColor.Inverted() );
            else
                m_gal->SetStrokeColor( labelColor );

            m_gal->SetLineWidth( width / 10.0 );
            m_gal->SetBold( false );
            m_gal->SetItalic( false );
            m_gal->SetMirrored( false );
            m_gal->SetGlyphSize( VECTOR2D( textSize * 0.7, textSize * 0.7 ) );
            m_gal->SetHorizontalJustify( GR_TEXT_HJUSTIFY_CENTER );
            m_gal->SetVerticalJustify( GR_TEXT_VJUSTIFY_CENTER );
            m_gal->StrokeText( netName, textPosition, textOrientation );
        }
    }
    else if( IsCopperLayer( aLayer ) )
    {
        // Draw a regular track
        const COLOR4D& color = m_pcbSettings.GetColor( aTrack, aLayer );
        m_gal->SetStrokeColor( color );
        m_gal->SetIsStroke( true );

        if( m_pcbSettings.m_sketchMode[TRACKS_VISIBLE] )
        {
            // Outline mode
            m_gal->SetLineWidth( m_pcbSettings.m_outlineWidth );
            m_gal->SetIsFill( false );
        }
        else
        {
            // Filled mode
            m_gal->SetFillColor( color );
            m_gal->SetIsFill( true );
        }
        m_gal->DrawSegment( start, end, width );
    }
}

bool GERBER_DRAW_ITEM::HitTest( const wxPoint& aRefPos ) const
{
    // In case the item has a very tiny width defined, allow it to be selected
    const int MIN_HIT_TEST_RADIUS = Millimeter2iu( 0.01 );

    // calculate aRefPos in XY gerber axis:
    wxPoint ref_pos = GetXYPosition( aRefPos );

    SHAPE_POLY_SET poly;

    switch( m_Shape )
    {
    case GBR_POLYGON:
        poly = m_Polygon;
        return poly.Contains( VECTOR2I( ref_pos ), 0 );

    case GBR_SPOT_POLY:
        poly = GetDcodeDescr()->m_Polygon;
        poly.Move( m_Start );
        return poly.Contains( VECTOR2I( ref_pos ), 0 );

    case GBR_SPOT_RECT:
        return GetBoundingBox().Contains( aRefPos );

    case GBR_ARC:
        {
            double radius = GetLineLength( m_Start, m_ArcCentre );
            VECTOR2D test_radius = VECTOR2D( ref_pos ) - VECTOR2D( m_ArcCentre );

            int size = ( ( m_Size.x < MIN_HIT_TEST_RADIUS ) ? MIN_HIT_TEST_RADIUS
                                                            : m_Size.x );

            // Are we close enough to the radius?
            bool radius_hit = ( std::fabs( test_radius.EuclideanNorm() - radius) < size );

            if( radius_hit )
            {
                // Now check that we are within the arc angle

                VECTOR2D start = VECTOR2D( m_Start ) - VECTOR2D( m_ArcCentre );
                VECTOR2D end = VECTOR2D( m_End ) - VECTOR2D( m_ArcCentre );

                double start_angle = NormalizeAngleRadiansPos( start.Angle() );
                double end_angle = NormalizeAngleRadiansPos( end.Angle() );

                if( m_Start == m_End )
                {
                    start_angle = 0;
                    end_angle = 2 * M_PI;
                }
                else if( end_angle < start_angle )
                {
                    end_angle += 2 * M_PI;
                }

                double test_angle = NormalizeAngleRadiansPos( test_radius.Angle() );

                return ( test_angle > start_angle && test_angle < end_angle );
            }

            return false;
        }

    case GBR_SPOT_MACRO:
        // Aperture macro polygons are already in absolute coordinates
        auto p = GetDcodeDescr()->GetMacro()->GetApertureMacroShape( this, m_Start );
        for( int i = 0; i < p->OutlineCount(); ++i )
        {
            if( p->Contains( VECTOR2I( aRefPos ), i ) )
                return true;
        }
        return false;
    }

    // TODO: a better analyze of the shape (perhaps create a D_CODE::HitTest for flashed items)
    int radius = std::min( m_Size.x, m_Size.y ) >> 1;

    if( radius < MIN_HIT_TEST_RADIUS )
        radius = MIN_HIT_TEST_RADIUS;

    if( m_Flashed )
        return HitTestPoints( m_Start, ref_pos, radius );
    else
        return TestSegmentHit( ref_pos, m_Start, m_End, radius );
}

SHAPE_LINE_CHAIN PNS_MEANDER_SHAPE::genMeanderShape( VECTOR2D aP, VECTOR2D aDir,
        bool aSide, PNS_MEANDER_TYPE aType, int aAmpl, int aBaselineOffset )
{
    const PNS_MEANDER_SETTINGS& st = Settings();
    int cr = cornerRadius();
    int offset = aBaselineOffset;
    int spc = spacing();

    if( aSide )
        offset *= -1;

    VECTOR2D dir_u_b( aDir.Resize( offset ) );
    VECTOR2D dir_v_b( dir_u_b.Perpendicular() );

    if( 2 * cr > aAmpl )
    {
        cr = aAmpl / 2;
    }

    if( 2 * cr > spc )
    {
        cr = spc / 2;
    }

    SHAPE_LINE_CHAIN lc;

    start( &lc, aP + dir_v_b, aDir );

    switch( aType )
    {
        case MT_EMPTY:
        {
            lc.Append( aP + dir_v_b + aDir );
            break;
        }
        case MT_START:
        {
            arc( cr - offset, false );
            uShape( aAmpl - 2 * cr + std::abs( offset ), cr + offset, spc - 2 * cr );
            forward( std::min( cr - offset, cr + offset ) );
            forward( std::abs( offset ) );

            break;
        }

        case MT_FINISH:
        {
            start( &lc, aP - dir_u_b, aDir );
            turn ( 90 );
            forward( std::min( cr - offset, cr + offset ) );
            forward( std::abs( offset ) );
            uShape( aAmpl - 2 * cr + std::abs( offset ), cr + offset, spc - 2 * cr );
            arc( cr - offset, false );
            break;
        }

        case MT_TURN:
        {
            start( &lc, aP - dir_u_b, aDir );
            turn( 90 );
            forward( std::abs( offset ) );
            uShape ( aAmpl - cr, cr + offset, spc - 2 * cr );
            forward( std::abs( offset ) );
            break;
        }

        case MT_SINGLE:
        {
            arc( cr - offset, false );
            uShape( aAmpl - 2 * cr + std::abs( offset ), cr + offset, spc - 2 * cr );
            arc( cr - offset, false );
            lc.Append( aP + dir_v_b + aDir.Resize ( 2 * st.m_spacing ) );
            break;
        }

        default:
            break;
    }

    if( aSide )
    {
        SEG axis ( aP, aP + aDir );

        for( int i = 0; i < lc.PointCount(); i++ )
            lc.Point( i ) = reflect( lc.CPoint( i ), axis );
    }

    return lc;
}