sch_line.cpp

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/*
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2015 Jean-Pierre Charras, jp.charras at wanadoo.fr
 * Copyright (C) 1992-2021 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.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
 */

#include <bitmaps.h>
#include <core/mirror.h>
#include <sch_painter.h>
#include <plotters/plotter.h>
#include <sch_line.h>
#include <sch_edit_frame.h>
#include <settings/color_settings.h>
#include <schematic.h>
#include <connection_graph.h>
#include <project/project_file.h>
#include <project/net_settings.h>
#include <trigo.h>
#include <board_item.h>
#include <advanced_config.h>

SCH_LINE::SCH_LINE( const wxPoint& pos, int layer ) :
 SCH_ITEM( nullptr, SCH_LINE_T )
{
 m_start = pos;
 m_end = pos;
 m_stroke.SetWidth( 0 );
 m_stroke.SetPlotStyle( PLOT_DASH_TYPE::DEFAULT );
 m_stroke.SetColor( COLOR4D::UNSPECIFIED );

 switch( layer )
 {
 default: m_layer = LAYER_NOTES; break;
 case LAYER_WIRE: m_layer = LAYER_WIRE; break;
 case LAYER_BUS: m_layer = LAYER_BUS; break;
 }

 if( layer == LAYER_NOTES )
 m_startIsDangling = m_endIsDangling = true;
 else
 m_startIsDangling = m_endIsDangling = false;

 if( layer == LAYER_WIRE )
 m_lastResolvedWidth = Mils2iu( DEFAULT_WIRE_WIDTH_MILS );
 else if( layer == LAYER_BUS )
 m_lastResolvedWidth = Mils2iu( DEFAULT_BUS_WIDTH_MILS );
 else
 m_lastResolvedWidth = Mils2iu( DEFAULT_LINE_WIDTH_MILS );

 m_lastResolvedLineStyle = GetDefaultStyle();
 m_lastResolvedColor = COLOR4D::UNSPECIFIED;
}


SCH_LINE::SCH_LINE( const SCH_LINE& aLine ) :
 SCH_ITEM( aLine )
{
 m_start = aLine.m_start;
 m_end = aLine.m_end;
 m_stroke = aLine.m_stroke;
 m_startIsDangling = aLine.m_startIsDangling;
 m_endIsDangling = aLine.m_endIsDangling;

 m_lastResolvedLineStyle = aLine.m_lastResolvedLineStyle;
 m_lastResolvedWidth = aLine.m_lastResolvedWidth;
 m_lastResolvedColor = aLine.m_lastResolvedColor;
}


EDA_ITEM* SCH_LINE::Clone() const
{
 return new SCH_LINE( *this );
}


/*
 * Conversion between PLOT_DASH_TYPE values and style names displayed
 */
const std::map<PLOT_DASH_TYPE, const char*> lineStyleNames{
 { PLOT_DASH_TYPE::SOLID, "solid" },
 { PLOT_DASH_TYPE::DASH, "dashed" },
 { PLOT_DASH_TYPE::DASHDOT, "dash_dot" },
 { PLOT_DASH_TYPE::DOT, "dotted" },
};


const char* SCH_LINE::GetLineStyleName( PLOT_DASH_TYPE aStyle )
{
 auto resultIt = lineStyleNames.find( aStyle );

 //legacy behavior is to default to dash if there is no name
 return resultIt == lineStyleNames.end() ? lineStyleNames.find( PLOT_DASH_TYPE::DASH )->second :
 resultIt->second;
}


PLOT_DASH_TYPE SCH_LINE::GetLineStyleByName( const wxString& aStyleName )
{
 PLOT_DASH_TYPE id = PLOT_DASH_TYPE::DEFAULT; // Default style id

 //find the name by value
 auto resultIt = std::find_if( lineStyleNames.begin(), lineStyleNames.end(),
 [aStyleName]( const auto& it )
 {
 return it.second == aStyleName;
 } );

 if( resultIt != lineStyleNames.end() )
 id = resultIt->first;

 return id;
}


void SCH_LINE::Move( const wxPoint& aOffset )
{
 if( aOffset != wxPoint( 0, 0 ) )
 {
 m_start += aOffset;
 m_end += aOffset;
 SetModified();
 }
}


void SCH_LINE::MoveStart( const wxPoint& aOffset )
{
 if( aOffset != wxPoint( 0, 0 ) )
 {
 m_start += aOffset;
 SetModified();
 }
}


void SCH_LINE::MoveEnd( const wxPoint& aOffset )
{
 if( aOffset != wxPoint( 0, 0 ) )
 {
 m_end += aOffset;
 SetModified();
 }
}


#if defined(DEBUG)

void SCH_LINE::Show( int nestLevel, std::ostream& os ) const
{
 NestedSpace( nestLevel, os ) << '<' << GetClass().Lower().mb_str()
 << " layer=\"" << m_layer << '"'
 << " startIsDangling=\"" << m_startIsDangling
 << '"' << " endIsDangling=\""
 << m_endIsDangling << '"' << ">"
 << " <start" << m_start << "/>"
 << " <end" << m_end << "/>" << "</"
 << GetClass().Lower().mb_str() << ">\n";
}

#endif


void SCH_LINE::ViewGetLayers( int aLayers[], int& aCount ) const
{
 aCount = 3;
 aLayers[0] = LAYER_DANGLING;
 aLayers[1] = m_layer;
 aLayers[2] = LAYER_SELECTION_SHADOWS;
}


const EDA_RECT SCH_LINE::GetBoundingBox() const
{
 int width = m_stroke.GetWidth() / 2;
 int extra = m_stroke.GetWidth() & 0x1;

 int xmin = std::min( m_start.x, m_end.x ) - width;
 int ymin = std::min( m_start.y, m_end.y ) - width;

 int xmax = std::max( m_start.x, m_end.x ) + width + extra;
 int ymax = std::max( m_start.y, m_end.y ) + width + extra;

 EDA_RECT ret( wxPoint( xmin, ymin ), wxSize( xmax - xmin, ymax - ymin ) );

 return ret;
}


double SCH_LINE::GetLength() const
{
 return GetLineLength( m_start, m_end );
}


void SCH_LINE::SetLineColor( const COLOR4D& aColor )
{
 m_stroke.SetColor( aColor );
}


void SCH_LINE::SetLineColor( const double r, const double g, const double b, const double a )
{
 COLOR4D newColor(r, g, b, a);

 if( newColor == COLOR4D::UNSPECIFIED )
 {
 m_stroke.SetColor( COLOR4D::UNSPECIFIED );
 }
 else
 {
 // Eeschema does not allow alpha channel in colors
 newColor.a = 1.0;
 m_stroke.SetColor( newColor );
 }
}


COLOR4D SCH_LINE::GetLineColor() const
{
 if( m_stroke.GetColor() != COLOR4D::UNSPECIFIED )
 {
 m_lastResolvedColor = m_stroke.GetColor();
 }
 else if( IsConnectable() && !IsConnectivityDirty() )
 {
 NETCLASSPTR netclass = NetClass();

 if( netclass )
 m_lastResolvedColor = netclass->GetSchematicColor();
 }

 return m_lastResolvedColor;
}


PLOT_DASH_TYPE SCH_LINE::GetDefaultStyle() const
{
 if( IsGraphicLine() )
 return PLOT_DASH_TYPE::DASH;

 return PLOT_DASH_TYPE::SOLID;
}


void SCH_LINE::SetLineStyle( const int aStyleId )
{
 SetLineStyle( static_cast<PLOT_DASH_TYPE>( aStyleId ) );
}


void SCH_LINE::SetLineStyle( const PLOT_DASH_TYPE aStyle )
{
 if( aStyle == GetDefaultStyle() )
 m_stroke.SetPlotStyle( PLOT_DASH_TYPE::DEFAULT );
 else
 m_stroke.SetPlotStyle( aStyle );
}


PLOT_DASH_TYPE SCH_LINE::GetLineStyle() const
{
 if( m_stroke.GetPlotStyle() != PLOT_DASH_TYPE::DEFAULT )
 return m_stroke.GetPlotStyle();

 return GetDefaultStyle();
}


PLOT_DASH_TYPE SCH_LINE::GetEffectiveLineStyle() const
{
 if( m_stroke.GetPlotStyle() != PLOT_DASH_TYPE::DEFAULT )
 {
 m_lastResolvedLineStyle = m_stroke.GetPlotStyle();
 }
 else if( IsConnectable() && !IsConnectivityDirty() )
 {
 NETCLASSPTR netclass = NetClass();

 if( netclass )
 m_lastResolvedLineStyle = static_cast<PLOT_DASH_TYPE>( netclass->GetLineStyle() );
 }

 return m_lastResolvedLineStyle;
}


void SCH_LINE::SetLineWidth( const int aSize )
{
 m_stroke.SetWidth( aSize );
}


int SCH_LINE::GetPenWidth() const
{
 SCHEMATIC* schematic = Schematic();
 NETCLASSPTR netclass;

 switch ( m_layer )
 {
 default:
 if( m_stroke.GetWidth() > 0 )
 return m_stroke.GetWidth();

 if( schematic )
 return schematic->Settings().m_DefaultLineWidth;

 return Mils2iu( DEFAULT_LINE_WIDTH_MILS );

 case LAYER_WIRE:
 if( m_stroke.GetWidth() > 0 )
 {
 m_lastResolvedWidth = m_stroke.GetWidth();
 }
 else if( !IsConnectivityDirty() )
 {
 netclass = NetClass();

 if( !netclass && schematic )
 netclass = schematic->Prj().GetProjectFile().NetSettings().m_NetClasses.GetDefault();

 if( netclass )
 m_lastResolvedWidth = netclass->GetWireWidth();
 }

 return m_lastResolvedWidth;

 case LAYER_BUS:
 if( m_stroke.GetWidth() > 0 )
 {
 m_lastResolvedWidth = m_stroke.GetWidth();
 }
 else if( !IsConnectivityDirty() )
 {
 netclass = NetClass();

 if( !netclass && schematic )
 netclass = schematic->Prj().GetProjectFile().NetSettings().m_NetClasses.GetDefault();

 if( netclass )
 m_lastResolvedWidth = netclass->GetBusWidth();
 }

 return m_lastResolvedWidth;
 }
}


void SCH_LINE::Print( const RENDER_SETTINGS* aSettings, const wxPoint& offset )
{
 wxDC* DC = aSettings->GetPrintDC();
 COLOR4D color = GetLineColor();

 if( color == COLOR4D::UNSPECIFIED )
 color = aSettings->GetLayerColor( GetLayer() );

 wxPoint start = m_start;
 wxPoint end = m_end;
 PLOT_DASH_TYPE lineStyle = GetEffectiveLineStyle();
 int penWidth = std::max( GetPenWidth(), aSettings->GetDefaultPenWidth() );

 if( lineStyle <= PLOT_DASH_TYPE::FIRST_TYPE )
 {
 GRLine( nullptr, DC, start.x, start.y, end.x, end.y, penWidth, color );
 }
 else
 {
 EDA_RECT clip( (wxPoint) start, wxSize( end.x - start.x, end.y - start.y ) );
 clip.Normalize();

 double theta = atan2( end.y - start.y, end.x - start.x );
 double strokes[] = { 1.0, dash_gap_len( penWidth ), 1.0, dash_gap_len( penWidth ) };

 switch( lineStyle )
 {
 default:
 case PLOT_DASH_TYPE::DASH:
 strokes[0] = strokes[2] = dash_mark_len( penWidth );
  break;
 case PLOT_DASH_TYPE::DOT:
 strokes[0] = strokes[2] = dot_mark_len( penWidth );
 break;
 case PLOT_DASH_TYPE::DASHDOT:
 strokes[0] = dash_mark_len( penWidth );
 strokes[2] = dot_mark_len( penWidth );
 break;
 }

 for( size_t i = 0; i < 10000; ++i )
 {
 // Calculations MUST be done in doubles to keep from accumulating rounding
 // errors as we go.
 wxPoint next( start.x + strokes[ i % 4 ] * cos( theta ),
 start.y + strokes[ i % 4 ] * sin( theta ) );

 // Drawing each segment can be done rounded to ints.
 wxPoint segStart( KiROUND( start.x ), KiROUND( start.y ) );
 wxPoint segEnd( KiROUND( next.x ), KiROUND( next.y ) );

 if( ClipLine( &clip, segStart.x, segStart.y, segEnd.x, segEnd.y ) )
 break;
 else if( i % 2 == 0 )
 GRLine( nullptr, DC, segStart.x, segStart.y, segEnd.x, segEnd.y, penWidth, color );

 start = next;
 }
 }
}


void SCH_LINE::MirrorVertically( int aCenter )
{
 if( m_flags & STARTPOINT )
 MIRROR( m_start.y, aCenter );

 if( m_flags & ENDPOINT )
 MIRROR( m_end.y, aCenter );
}


void SCH_LINE::MirrorHorizontally( int aCenter )
{
 if( m_flags & STARTPOINT )
 MIRROR( m_start.x, aCenter );

 if( m_flags & ENDPOINT )
 MIRROR( m_end.x, aCenter );
}


void SCH_LINE::Rotate( const wxPoint& aCenter )
{
 // When we allow off grid items, the
 // else if should become a plain if to allow
 // rotation around the center of the line
 if( m_flags & STARTPOINT )
 RotatePoint( &m_start, aCenter, 900 );
 else if( m_flags & ENDPOINT )
 RotatePoint( &m_end, aCenter, 900 );
}


void SCH_LINE::RotateStart( const wxPoint& aCenter )
{
 RotatePoint( &m_start, aCenter, 900 );
}


void SCH_LINE::RotateEnd( const wxPoint& aCenter )
{
 RotatePoint( &m_end, aCenter, 900 );
}


int SCH_LINE::GetAngleFrom( const wxPoint& aPoint ) const
{
 wxPoint vec;

 if( aPoint == m_start )
 vec = m_end - aPoint;
 else
 vec = m_start - aPoint;

 return KiROUND( ArcTangente( vec.y, vec.x ) );
}


int SCH_LINE::GetReverseAngleFrom( const wxPoint& aPoint ) const
{
 wxPoint vec;

 if( aPoint == m_end )
 vec = m_start - aPoint;
 else
 vec = m_end - aPoint;

 return KiROUND( ArcTangente( vec.y, vec.x ) );
}


bool SCH_LINE::IsParallel( const SCH_LINE* aLine ) const
{
 wxCHECK_MSG( aLine != nullptr && aLine->Type() == SCH_LINE_T, false,
 wxT( "Cannot test line segment for overlap." ) );

 wxPoint firstSeg = m_end - m_start;
 wxPoint secondSeg = aLine->m_end - aLine->m_start;

 // Use long long here to avoid overflow in calculations
 return !( (long long) firstSeg.x * secondSeg.y - (long long) firstSeg.y * secondSeg.x );
}


SCH_LINE* SCH_LINE::MergeOverlap( SCH_SCREEN* aScreen, SCH_LINE* aLine, bool aCheckJunctions )
{
 auto less =
 []( const wxPoint& lhs, const wxPoint& rhs ) -> bool
 {
 if( lhs.x == rhs.x )
 return lhs.y < rhs.y;

 return lhs.x < rhs.x;
 };

 wxCHECK_MSG( aLine != nullptr && aLine->Type() == SCH_LINE_T, nullptr,
 wxT( "Cannot test line segment for overlap." ) );

 if( this == aLine || GetLayer() != aLine->GetLayer() )
 return nullptr;

 wxPoint leftmost_start = aLine->m_start;
 wxPoint leftmost_end = aLine->m_end;

 wxPoint rightmost_start = m_start;
 wxPoint rightmost_end = m_end;

 // We place the start to the left and below the end of both lines
 if( leftmost_start != std::min( { leftmost_start, leftmost_end }, less ) )
 std::swap( leftmost_start, leftmost_end );
 if( rightmost_start != std::min( { rightmost_start, rightmost_end }, less ) )
 std::swap( rightmost_start, rightmost_end );

 // - leftmost is the line that starts farthest to the left
 // - other is the line that is _not_ leftmost
 // - rightmost is the line that ends farthest to the right. This may or may not be 'other'
 // as the second line may be completely covered by the first.
 if( less( rightmost_start, leftmost_start ) )
 {
 std::swap( leftmost_start, rightmost_start );
 std::swap( leftmost_end, rightmost_end );
 }

 wxPoint other_start = rightmost_start;
 wxPoint other_end = rightmost_end;

 if( less( rightmost_end, leftmost_end ) )
 {
 rightmost_start = leftmost_start;
 rightmost_end = leftmost_end;
 }

 // If we end one before the beginning of the other, no overlap is possible
 if( less( leftmost_end, other_start ) )
 {
 return nullptr;
 }

 // Search for a common end:
 if( ( leftmost_start == other_start ) && ( leftmost_end == other_end ) ) // Trivial case
 {
 SCH_LINE* ret = new SCH_LINE( *aLine );
 ret->SetStartPoint( leftmost_start );
 ret->SetEndPoint( leftmost_end );
 ret->SetConnectivityDirty( true );

 if( IsSelected() || aLine->IsSelected() )
 ret->SetSelected();

 return ret;
 }

 bool colinear = false;

 /* Test alignment: */
 if( ( leftmost_start.y == leftmost_end.y ) &&
 ( other_start.y == other_end.y ) ) // Horizontal segment
 {
 colinear = ( leftmost_start.y == other_start.y );
 }
 else if( ( leftmost_start.x == leftmost_end.x ) &&
 ( other_start.x == other_end.x ) ) // Vertical segment
 {
 colinear = ( leftmost_start.x == other_start.x );
 }
 else
 {
 // We use long long here to avoid overflow -- it enforces promotion
 // The slope of the left-most line is dy/dx. Then we check that the slope from the
 // left most start to the right most start is the same as well as the slope from the
 // left most start to right most end.
 long long dx = leftmost_end.x - leftmost_start.x;
 long long dy = leftmost_end.y - leftmost_start.y;
 colinear = ( ( ( other_start.y - leftmost_start.y ) * dx ==
 ( other_start.x - leftmost_start.x ) * dy ) &&
 ( ( other_end.y - leftmost_start.y ) * dx ==
 ( other_end.x - leftmost_start.x ) * dy ) );
 }

 if( !colinear )
 return nullptr;

 // We either have a true overlap or colinear touching segments. We always want to merge
 // the former, but the later only get merged if there no junction at the touch point.

 bool touching = leftmost_end == rightmost_start;

 if( touching && aCheckJunctions && aScreen->IsJunction( leftmost_end ) )
 return nullptr;

 // Make a new segment that merges the 2 segments
 leftmost_end = rightmost_end;

 SCH_LINE* ret = new SCH_LINE( *aLine );
 ret->SetStartPoint( leftmost_start );
 ret->SetEndPoint( leftmost_end );
 ret->SetConnectivityDirty( true );

 if( IsSelected() || aLine->IsSelected() )
 ret->SetSelected();

 return ret;
}


void SCH_LINE::GetEndPoints( std::vector <DANGLING_END_ITEM>& aItemList )
{
 if( IsConnectable() )
 {
 aItemList.emplace_back( IsBus() ? BUS_END : WIRE_END, this, m_start );
 aItemList.emplace_back( IsBus() ? BUS_END : WIRE_END, this, m_end );
 }
}


bool SCH_LINE::UpdateDanglingState( std::vector<DANGLING_END_ITEM>& aItemList,
 const SCH_SHEET_PATH* aPath )
{
 if( IsConnectable() )
 {
 bool previousStartState = m_startIsDangling;
 bool previousEndState = m_endIsDangling;

 m_startIsDangling = m_endIsDangling = true;

 for( DANGLING_END_ITEM item : aItemList )
 {
 if( item.GetItem() == this )
 continue;

 if( ( IsWire() && item.GetType() != BUS_END && item.GetType() != BUS_ENTRY_END )
 || ( IsBus() && item.GetType() != WIRE_END && item.GetType() != PIN_END ) )
 {
 if( m_start == item.GetPosition() )
 m_startIsDangling = false;

 if( m_end == item.GetPosition() )
 m_endIsDangling = false;

 if( !m_startIsDangling && !m_endIsDangling )
 break;
 }
 }

 // We only use the bus dangling state for automatic line starting, so we don't care if it
 // has changed or not (and returning true will result in extra work)
 if( IsBus() )
 return false;

 return previousStartState != m_startIsDangling || previousEndState != m_endIsDangling;
 }

 return false;
}


bool SCH_LINE::IsConnectable() const
{
 if( m_layer == LAYER_WIRE || m_layer == LAYER_BUS )
 return true;

 return false;
}


bool SCH_LINE::CanConnect( const SCH_ITEM* aItem ) const
{
 if( m_layer == LAYER_WIRE )
 {
 switch( aItem->Type() )
 {
 case SCH_JUNCTION_T:
 case SCH_NO_CONNECT_T:
 case SCH_LABEL_T:
 case SCH_GLOBAL_LABEL_T:
 case SCH_HIER_LABEL_T:
 case SCH_BUS_WIRE_ENTRY_T:
 case SCH_SYMBOL_T:
 case SCH_SHEET_T:
 case SCH_SHEET_PIN_T:
 return true;
 default:
 break;
 }
 }
 else if( m_layer == LAYER_BUS )
 {
 switch( aItem->Type() )
 {
 case SCH_JUNCTION_T:
 case SCH_LABEL_T:
 case SCH_GLOBAL_LABEL_T:
 case SCH_HIER_LABEL_T:
 case SCH_BUS_WIRE_ENTRY_T:
 case SCH_SHEET_T:
 case SCH_SHEET_PIN_T:
 return true;
 default:
 break;
 }
 }

 return aItem->GetLayer() == m_layer;
}


std::vector<wxPoint> SCH_LINE::GetConnectionPoints() const
{
 return { m_start, m_end };
}


bool SCH_LINE::ConnectionPropagatesTo( const EDA_ITEM* aItem ) const
{
 switch( aItem->Type() )
 {
 case SCH_LINE_T:
 return IsBus() == static_cast<const SCH_LINE*>( aItem )->IsBus();

 default:
 return true;
 }
}


void SCH_LINE::GetSelectedPoints( std::vector< wxPoint >& aPoints ) const
{
 if( m_flags & STARTPOINT )
 aPoints.push_back( m_start );

 if( m_flags & ENDPOINT )
 aPoints.push_back( m_end );
}


wxString SCH_LINE::GetSelectMenuText( EDA_UNITS aUnits ) const
{
 wxString txtfmt, orient;

 if( m_start.x == m_end.x )
 {
 switch( m_layer )
 {
 case LAYER_WIRE: txtfmt = _( "Vertical Wire, length %s" ); break;
 case LAYER_BUS: txtfmt = _( "Vertical Bus, length %s" ); break;
 default: txtfmt = _( "Vertical Graphic Line, length %s" ); break;
 }
 }
 else if( m_start.y == m_end.y )
 {
 switch( m_layer )
 {
 case LAYER_WIRE: txtfmt = _( "Horizontal Wire, length %s" ); break;
 case LAYER_BUS: txtfmt = _( "Horizontal Bus, length %s" ); break;
 default: txtfmt = _( "Horizontal Graphic Line, length %s" ); break;
 }
 }
 else
 {
 switch( m_layer )
 {
 case LAYER_WIRE: txtfmt = _( "Wire, length %s" ); break;
 case LAYER_BUS: txtfmt = _( "Bus, length %s" ); break;
 default: txtfmt = _( "Graphic Line, length %s" ); break;
 }
 }

 return wxString::Format( txtfmt,
 MessageTextFromValue( aUnits, EuclideanNorm( m_start - m_end ) ) );
}


BITMAPS SCH_LINE::GetMenuImage() const
{
 if( m_layer == LAYER_NOTES )
 return BITMAPS::add_dashed_line;
 else if( m_layer == LAYER_WIRE )
 return BITMAPS::add_line;

 return BITMAPS::add_bus;
}


bool SCH_LINE::operator <( const SCH_ITEM& aItem ) const
{
 if( Type() != aItem.Type() )
 return Type() < aItem.Type();

 const SCH_LINE* line = static_cast<const SCH_LINE*>( &aItem );

 if( GetLayer() != line->GetLayer() )
 return GetLayer() < line->GetLayer();

 if( GetStartPoint().x != line->GetStartPoint().x )
 return GetStartPoint().x < line->GetStartPoint().x;

 if( GetStartPoint().y != line->GetStartPoint().y )
 return GetStartPoint().y < line->GetStartPoint().y;

 if( GetEndPoint().x != line->GetEndPoint().x )
 return GetEndPoint().x < line->GetEndPoint().x;

 return GetEndPoint().y < line->GetEndPoint().y;
}


bool SCH_LINE::HitTest( const wxPoint& aPosition, int aAccuracy ) const
{
 // Performance enhancement for connection-building
 if( aPosition == m_start || aPosition == m_end )
 return true;

 if( aAccuracy >= 0 )
 aAccuracy += GetPenWidth() / 2;
 else
 aAccuracy = abs( aAccuracy );

 if( TestSegmentHit( aPosition, m_start, m_end, aAccuracy ) )
 return true;

 aAccuracy += Mils2iu( DANGLING_SYMBOL_SIZE );

 return ( EuclideanNorm( aPosition - m_start ) < aAccuracy
 || EuclideanNorm( aPosition - m_end ) < aAccuracy );
}


bool SCH_LINE::HitTest( const EDA_RECT& aRect, bool aContained, int aAccuracy ) const
{
 if( m_flags & (STRUCT_DELETED | SKIP_STRUCT ) )
 return false;

 EDA_RECT rect = aRect;

 if ( aAccuracy )
 rect.Inflate( aAccuracy );

 if( aContained )
 return rect.Contains( m_start ) && rect.Contains( m_end );

 return rect.Intersects( m_start, m_end );
}


void SCH_LINE::SwapData( SCH_ITEM* aItem )
{
 SCH_LINE* item = (SCH_LINE*) aItem;

 std::swap( m_layer, item->m_layer );

 std::swap( m_start, item->m_start );
 std::swap( m_end, item->m_end );
 std::swap( m_startIsDangling, item->m_startIsDangling );
 std::swap( m_endIsDangling, item->m_endIsDangling );
 std::swap( m_stroke, item->m_stroke );
}


bool SCH_LINE::doIsConnected( const wxPoint& aPosition ) const
{
 if( m_layer != LAYER_WIRE && m_layer != LAYER_BUS )
 return false;

 return IsEndPoint( aPosition );
}


void SCH_LINE::Plot( PLOTTER* aPlotter ) const
{
 auto* settings = static_cast<KIGFX::SCH_RENDER_SETTINGS*>( aPlotter->RenderSettings() );
 int penWidth = std::max( GetPenWidth(), settings->GetMinPenWidth() );
 COLOR4D color = GetLineColor();

 if( color == COLOR4D::UNSPECIFIED )
 color = settings->GetLayerColor( GetLayer() );

 aPlotter->SetColor( color );

 aPlotter->SetCurrentLineWidth( penWidth );
 aPlotter->SetDash( GetEffectiveLineStyle() );

 aPlotter->MoveTo( m_start );
 aPlotter->FinishTo( m_end );

 aPlotter->SetDash( PLOT_DASH_TYPE::SOLID );
}


void SCH_LINE::SetPosition( const wxPoint& aPosition )
{
 m_end = m_end - ( m_start - aPosition );
 m_start = aPosition;
}


void SCH_LINE::GetMsgPanelInfo( EDA_DRAW_FRAME* aFrame, std::vector<MSG_PANEL_ITEM>& aList )
{
 wxString msg;

 switch( GetLayer() )
 {
 case LAYER_WIRE: msg = _( "Wire" ); break;
 case LAYER_BUS: msg = _( "Bus" ); break;
 default: msg = _( "Graphical" ); break;
 }

 aList.emplace_back( _( "Line Type" ), msg );

 if( GetLineStyle() != GetEffectiveLineStyle() )
 msg = _( "from netclass" );
 else
 msg = GetLineStyleName( GetLineStyle() );

 aList.emplace_back( _( "Line Style" ), msg );

 SCH_CONNECTION* conn = nullptr;

 if( !IsConnectivityDirty() && dynamic_cast<SCH_EDIT_FRAME*>( aFrame ) )
 conn = Connection();

 if( conn )
 {
 conn->AppendInfoToMsgPanel( aList );

 if( !conn->IsBus() )
  {
 NET_SETTINGS& netSettings = Schematic()->Prj().GetProjectFile().NetSettings();
 wxString netname = conn->Name();
 wxString netclassName = netSettings.m_NetClasses.GetDefaultPtr()->GetName();

 if( netSettings.m_NetClassAssignments.count( netname ) )
 netclassName = netSettings.m_NetClassAssignments[ netname ];

 aList.emplace_back( _( "Assigned Netclass" ), netclassName );
 }
 }
}


bool SCH_LINE::IsGraphicLine() const
{
 return ( GetLayer() == LAYER_NOTES );
}


bool SCH_LINE::IsWire() const
{
 return ( GetLayer() == LAYER_WIRE );
}

bool SCH_LINE::IsBus() const
{
 return ( GetLayer() == LAYER_BUS );
}


bool SCH_LINE::UsesDefaultStroke() const
{
 return m_stroke.GetWidth() == 0 && m_stroke.GetColor() == COLOR4D::UNSPECIFIED
 && ( m_stroke.GetPlotStyle() == GetDefaultStyle()
 || m_stroke.GetPlotStyle() == PLOT_DASH_TYPE::DEFAULT );
}