Added main execs

1 files changed, 1655 insertions, 0 deletions

diff --git a/pcbnew/class_track.cpp b/pcbnew/class_track.cpp
new file mode 100644
index 0000000..ff3c55d
--- /dev/null
+++ b/pcbnew/class_track.cpp
@@ -0,0 +1,1655 @@
+/*
+ * This program source code file is part of KiCad, a free EDA CAD application.
+ *
+ * Copyright (C) 2012 Jean-Pierre Charras, jean-pierre.charras@ujf-grenoble.fr
+ * Copyright (C) 2012 SoftPLC Corporation, Dick Hollenbeck <dick@softplc.com>
+ * Copyright (C) 2012 Wayne Stambaugh <stambaughw@verizon.net>
+ * Copyright (C) 1992-2015 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
+ */
+
+/**
+ * @file class_track.h
+ * @brief Functions relatives to tracks, vias and segments used to fill zones.
+ */
+
+#include <fctsys.h>
+#include <gr_basic.h>
+#include <common.h>
+#include <trigo.h>
+#include <macros.h>
+#include <class_drawpanel.h>
+#include <class_pcb_screen.h>
+#include <drawtxt.h>
+#include <colors_selection.h>
+#include <wxstruct.h>
+#include <wxBasePcbFrame.h>
+#include <class_board.h>
+#include <class_track.h>
+#include <pcbnew.h>
+#include <base_units.h>
+#include <msgpanel.h>
+
+
+/**
+ * Function ShowClearance
+ * tests to see if the clearance border is drawn on the given track.
+ * @return bool - true if should draw clearance, else false.
+ */
+static bool ShowClearance( DISPLAY_OPTIONS* aDisplOpts, const TRACK* aTrack )
+{
+    // maybe return true for tracks and vias, not for zone segments
+    return IsCopperLayer( aTrack->GetLayer() )
+           && ( aTrack->Type() == PCB_TRACE_T || aTrack->Type() == PCB_VIA_T )
+           && ( ( aDisplOpts->m_ShowTrackClearanceMode == SHOW_CLEARANCE_NEW_AND_EDITED_TRACKS_AND_VIA_AREAS
+                  && ( aTrack->IsDragging() || aTrack->IsMoving() || aTrack->IsNew() ) )
+            || ( aDisplOpts->m_ShowTrackClearanceMode == SHOW_CLEARANCE_ALWAYS )
+            );
+
+}
+
+
+TRACK* GetTrack( TRACK* aStartTrace, const TRACK* aEndTrace,
+        const wxPoint& aPosition, LSET aLayerMask )
+{
+    for( TRACK *PtSegm = aStartTrace; PtSegm != NULL; PtSegm = PtSegm->Next() )
+    {
+        if( PtSegm->GetState( IS_DELETED | BUSY ) == 0 )
+        {
+            if( aPosition == PtSegm->GetStart() )
+            {
+                if( ( aLayerMask & PtSegm->GetLayerSet() ).any() )
+                    return PtSegm;
+            }
+
+            if( aPosition == PtSegm->GetEnd() )
+            {
+                if( ( aLayerMask & PtSegm->GetLayerSet() ).any() )
+                    return PtSegm;
+            }
+        }
+
+        if( PtSegm == aEndTrace )
+            break;
+    }
+
+    return NULL;
+}
+
+
+TRACK::TRACK( BOARD_ITEM* aParent, KICAD_T idtype ) :
+    BOARD_CONNECTED_ITEM( aParent, idtype )
+{
+    m_Width = Millimeter2iu( 0.2 );
+    start   = end = NULL;
+    m_Param = 0;
+}
+
+
+EDA_ITEM* TRACK::Clone() const
+{
+    return new TRACK( *this );
+}
+
+
+wxString TRACK::ShowWidth() const
+{
+    wxString msg = ::CoordinateToString( m_Width );
+    return msg;
+}
+
+
+SEGZONE::SEGZONE( BOARD_ITEM* aParent ) :
+    TRACK( aParent, PCB_ZONE_T )
+{
+}
+
+
+EDA_ITEM* SEGZONE::Clone() const
+{
+    return new SEGZONE( *this );
+}
+
+
+wxString SEGZONE::GetSelectMenuText() const
+{
+    wxString text, nettxt;
+    BOARD* board = GetBoard();
+
+    if( board )
+    {
+        nettxt = GetNetname();
+    }
+    else
+    {
+        wxFAIL_MSG( wxT( "SEGZONE::GetSelectMenuText: BOARD is NULL" ) );
+        nettxt = wxT( "???" );
+    }
+
+    text.Printf( _( "Zone (%08lX) [%s] on %s" ),
+                 m_TimeStamp, GetChars( nettxt ), GetChars( GetLayerName() ) );
+
+    return text;
+}
+
+
+VIA::VIA( BOARD_ITEM* aParent ) :
+    TRACK( aParent, PCB_VIA_T )
+{
+    SetViaType( VIA_THROUGH );
+    m_BottomLayer = B_Cu;
+    SetDrillDefault();
+}
+
+
+EDA_ITEM* VIA::Clone() const
+{
+    return new VIA( *this );
+}
+
+
+wxString VIA::GetSelectMenuText() const
+{
+    wxString text;
+    wxString format;
+    BOARD* board = GetBoard();
+
+    switch( GetViaType() )
+    {
+    case VIA_BLIND_BURIED:
+        format = _( "Blind/Buried Via %s, net[%s] (%d) on layers %s/%s" );
+        break;
+    case VIA_MICROVIA:
+        format = _( "Micro Via %s, Net [%s] (%d) on layers %s/%s" );
+        break;
+    // else say nothing about normal (through) vias
+    default:
+        format = _( "Via %s net [%s] (%d) on layers %s/%s" );
+        break;
+    }
+
+
+    if( board )
+    {
+        wxString netname = GetNetname();
+
+        // say which layers, only two for now
+        LAYER_ID topLayer;
+        LAYER_ID botLayer;
+        LayerPair( &topLayer, &botLayer );
+        text.Printf( format.GetData(), GetChars( ShowWidth() ),
+                     GetChars( netname ), GetNetCode(),
+                     GetChars( board->GetLayerName( topLayer ) ),
+                     GetChars( board->GetLayerName( botLayer ) ) );
+
+    }
+    else
+    {
+        wxFAIL_MSG( wxT( "VIA::GetSelectMenuText: BOARD is NULL" ) );
+        text.Printf( format.GetData(), GetChars( ShowWidth() ),
+                     wxT( "???" ), 0,
+                     wxT( "??" ), wxT( "??" ) );
+    }
+
+    return text;
+}
+
+
+int TRACK::GetClearance( BOARD_CONNECTED_ITEM* aItem ) const
+{
+    // Currently tracks have no specific clearance parameter on a per track or per
+    // segment basis.  The NETCLASS clearance is used.
+    return BOARD_CONNECTED_ITEM::GetClearance( aItem );
+}
+
+
+int VIA::GetDrillValue() const
+{
+    if( m_Drill > 0 )      // Use the specific value.
+        return m_Drill;
+
+    // Use the default value from the Netclass
+    NETCLASSPTR netclass = GetNetClass();
+
+    if( GetViaType() == VIA_MICROVIA )
+        return netclass->GetuViaDrill();
+
+    return netclass->GetViaDrill();
+}
+
+
+bool TRACK::IsNull()
+{
+    if( ( Type() != PCB_VIA_T ) && ( m_Start == m_End ) )
+        return true;
+    else
+        return false;
+}
+
+
+STATUS_FLAGS TRACK::IsPointOnEnds( const wxPoint& point, int min_dist )
+{
+    STATUS_FLAGS result = 0;
+
+    if( min_dist < 0 )
+        min_dist = m_Width / 2;
+
+    if( min_dist == 0 )
+    {
+        if( m_Start == point  )
+            result |= STARTPOINT;
+
+        if( m_End == point )
+            result |= ENDPOINT;
+    }
+    else
+    {
+        double dist = GetLineLength( m_Start, point );
+
+        if( min_dist >= KiROUND( dist ) )
+            result |= STARTPOINT;
+
+        dist = GetLineLength( m_End, point );
+
+        if( min_dist >= KiROUND( dist ) )
+            result |= ENDPOINT;
+    }
+
+    return result;
+}
+
+
+const EDA_RECT TRACK::GetBoundingBox() const
+{
+    // end of track is round, this is its radius, rounded up
+    int radius;
+
+    int ymax;
+    int xmax;
+
+    int ymin;
+    int xmin;
+
+    if( Type() == PCB_VIA_T )
+    {
+        // Because vias are sometimes drawn larger than their m_Width would
+        // provide, erasing them using a dirty rect must also compensate for this
+        // possibility (that the via is larger on screen than its m_Width would provide).
+        // Because it is cheap to return a larger BoundingBox, do it so that
+        // the via gets erased properly.  Do not divide width by 2 for this reason.
+        radius = m_Width;
+
+        ymax = m_Start.y;
+        xmax = m_Start.x;
+
+        ymin = m_Start.y;
+        xmin = m_Start.x;
+    }
+    else
+    {
+        radius = ( m_Width + 1 ) / 2;
+
+        ymax = std::max( m_Start.y, m_End.y );
+        xmax = std::max( m_Start.x, m_End.x );
+
+        ymin = std::min( m_Start.y, m_End.y );
+        xmin = std::min( m_Start.x, m_End.x );
+    }
+
+    // + 1 is for the clearance line itself.
+    radius += GetClearance() + 1;
+
+    ymax += radius;
+    xmax += radius;
+
+    ymin -= radius;
+    xmin -= radius;
+
+    // return a rectangle which is [pos,dim) in nature.  therefore the +1
+    EDA_RECT ret( wxPoint( xmin, ymin ), wxSize( xmax - xmin + 1, ymax - ymin + 1 ) );
+
+    return ret;
+}
+
+
+void TRACK::Rotate( const wxPoint& aRotCentre, double aAngle )
+{
+    RotatePoint( &m_Start, aRotCentre, aAngle );
+    RotatePoint( &m_End, aRotCentre, aAngle );
+}
+
+
+void TRACK::Flip( const wxPoint& aCentre )
+{
+    m_Start.y = aCentre.y - (m_Start.y - aCentre.y);
+    m_End.y   = aCentre.y - (m_End.y - aCentre.y);
+    int copperLayerCount = GetBoard()->GetCopperLayerCount();
+    SetLayer( FlipLayer( GetLayer(), copperLayerCount ) );
+}
+
+
+void VIA::Flip( const wxPoint& aCentre )
+{
+    m_Start.y = aCentre.y - (m_Start.y - aCentre.y);
+    m_End.y   = aCentre.y - (m_End.y - aCentre.y);
+
+    if( GetViaType() != VIA_THROUGH )
+    {
+        int copperLayerCount = GetBoard()->GetCopperLayerCount();
+        LAYER_ID top_layer;
+        LAYER_ID bottom_layer;
+        LayerPair( &top_layer, &bottom_layer );
+        top_layer = FlipLayer( top_layer, copperLayerCount );
+        bottom_layer = FlipLayer( bottom_layer, copperLayerCount );
+        SetLayerPair( top_layer, bottom_layer );
+    }
+}
+
+
+// see class_track.h
+SEARCH_RESULT TRACK::Visit( INSPECTOR* inspector, const void* testData,
+                            const KICAD_T scanTypes[] )
+{
+    KICAD_T stype = *scanTypes;
+
+    // If caller wants to inspect my type
+    if( stype == Type() )
+    {
+        if( SEARCH_QUIT == inspector->Inspect( this, testData ) )
+            return SEARCH_QUIT;
+    }
+
+    return SEARCH_CONTINUE;
+}
+
+
+bool VIA::IsOnLayer( LAYER_ID layer_number ) const
+{
+    LAYER_ID bottom_layer, top_layer;
+
+    LayerPair( &top_layer, &bottom_layer );
+
+    wxASSERT( top_layer <= bottom_layer );
+
+    if( top_layer <= layer_number && layer_number <= bottom_layer )
+        return true;
+    else
+        return false;
+}
+
+
+LSET VIA::GetLayerSet() const
+{
+    if( GetViaType() == VIA_THROUGH )
+        return LSET::AllCuMask();
+
+    // VIA_BLIND_BURIED or VIA_MICRVIA:
+
+    LSET layermask;
+
+    wxASSERT( m_Layer <= m_BottomLayer );
+
+    // LAYER_IDs are numbered from front to back, this is top to bottom.
+    for( LAYER_NUM id = m_Layer;  id <= m_BottomLayer;  ++id )
+    {
+        layermask.set( id );
+    }
+
+    return layermask;
+}
+
+
+void VIA::SetLayerPair( LAYER_ID aTopLayer, LAYER_ID aBottomLayer )
+{
+    if( GetViaType() == VIA_THROUGH )
+    {
+        aTopLayer    = F_Cu;
+        aBottomLayer = B_Cu;
+    }
+
+    if( aBottomLayer < aTopLayer )
+        std::swap( aBottomLayer, aTopLayer );
+
+    m_Layer = aTopLayer;
+    m_BottomLayer = aBottomLayer;
+}
+
+
+void VIA::LayerPair( LAYER_ID* top_layer, LAYER_ID* bottom_layer ) const
+{
+    LAYER_ID t_layer = F_Cu;
+    LAYER_ID b_layer = B_Cu;
+
+    if( GetViaType() != VIA_THROUGH )
+    {
+        b_layer = m_BottomLayer;
+        t_layer = m_Layer;
+
+        if( b_layer < t_layer )
+            std::swap( b_layer, t_layer );
+    }
+
+    if( top_layer )
+        *top_layer = t_layer;
+
+    if( bottom_layer )
+        *bottom_layer = b_layer;
+}
+
+
+TRACK* TRACK::GetBestInsertPoint( BOARD* aPcb )
+{
+    TRACK* track;
+
+    if( Type() == PCB_ZONE_T )
+        track = aPcb->m_Zone;
+    else
+        track = aPcb->m_Track;
+
+    for( ; track;  track = track->Next() )
+    {
+        if( GetNetCode() <= track->GetNetCode() )
+            return track;
+    }
+
+    return NULL;
+}
+
+
+TRACK* TRACK::GetStartNetCode( int NetCode )
+{
+    TRACK* Track = this;
+    int    ii    = 0;
+
+    if( NetCode == -1 )
+        NetCode = GetNetCode();
+
+    while( Track != NULL )
+    {
+        if( Track->GetNetCode() > NetCode )
+            break;
+
+        if( Track->GetNetCode() == NetCode )
+        {
+            ii++;
+            break;
+        }
+
+        Track = (TRACK*) Track->Pnext;
+    }
+
+    if( ii )
+        return Track;
+    else
+        return NULL;
+}
+
+
+TRACK* TRACK::GetEndNetCode( int NetCode )
+{
+    TRACK* NextS, * Track = this;
+    int    ii = 0;
+
+    if( Track == NULL )
+        return NULL;
+
+    if( NetCode == -1 )
+        NetCode = GetNetCode();
+
+    while( Track != NULL )
+    {
+        NextS = (TRACK*) Track->Pnext;
+
+        if( Track->GetNetCode() == NetCode )
+            ii++;
+
+        if( NextS == NULL )
+            break;
+
+        if( NextS->GetNetCode() > NetCode )
+            break;
+
+        Track = NextS;
+    }
+
+    if( ii )
+        return Track;
+    else
+        return NULL;
+}
+
+void TRACK::DrawShortNetname( EDA_DRAW_PANEL* panel,
+        wxDC* aDC, GR_DRAWMODE aDrawMode, EDA_COLOR_T aBgColor )
+{
+    if( ! panel )
+        return;
+
+    /* we must filter tracks, to avoid a lot of texts.
+     *  - only tracks with a length > 10 * thickness are eligible
+     * and, of course, if we are not printing the board
+     */
+    DISPLAY_OPTIONS* displ_opts = (DISPLAY_OPTIONS*)panel->GetDisplayOptions();
+
+    if( displ_opts->m_DisplayNetNamesMode == 0 || displ_opts->m_DisplayNetNamesMode == 1 )
+        return;
+
+    #define THRESHOLD 10
+
+    int len = KiROUND( GetLineLength( m_Start, m_End ) );
+
+    if( len < THRESHOLD * m_Width )
+        return;
+
+    // no room to display a text inside track
+    if( aDC->LogicalToDeviceXRel( m_Width ) < MIN_TEXT_SIZE )
+        return;
+
+    if( GetNetCode() == NETINFO_LIST::UNCONNECTED )
+        return;
+
+    NETINFO_ITEM* net = GetNet();
+
+    if( net == NULL )
+        return;
+
+    int textlen = net->GetShortNetname().Len();
+
+    if( textlen > 0 )
+    {
+        // calculate a good size for the text
+        int     tsize = std::min( m_Width, len / textlen );
+        int     dx = m_End.x - m_Start.x ;
+        int     dy = m_End.y - m_Start.y ;
+        wxPoint tpos  = m_Start + m_End;
+        tpos.x /= 2;
+        tpos.y /= 2;
+
+        // Calculate angle: if the track segment is vertical, angle = 90 degrees
+        // If horizontal 0 degrees, otherwise compute it
+        double angle;        // angle is in 0.1 degree
+
+        if( dy == 0 )        // Horizontal segment
+        {
+            angle = 0;
+        }
+        else
+        {
+            if( dx == 0 )    // Vertical segment
+            {
+                angle = 900;
+            }
+            else
+            {
+                /* atan2 is *not* the solution here, since it can give upside
+                   down text. We want to work only in the first and fourth quadrant */
+                angle = RAD2DECIDEG( -atan( double( dy ) / double( dx ) ) );
+            }
+        }
+
+        LAYER_ID curr_layer = ( (PCB_SCREEN*) panel->GetScreen() )->m_Active_Layer;
+
+        if( ( aDC->LogicalToDeviceXRel( tsize ) >= MIN_TEXT_SIZE )
+         && ( !(!IsOnLayer( curr_layer )&& displ_opts->m_ContrastModeDisplay) ) )
+        {
+            if( (aDrawMode & GR_XOR) == 0 )
+                GRSetDrawMode( aDC, GR_COPY );
+
+            tsize = (tsize * 7) / 10;       // small reduction to give a better look
+            DrawGraphicHaloText( panel->GetClipBox(), aDC, tpos,
+                                 aBgColor, BLACK, WHITE, net->GetShortNetname(), angle,
+                                 wxSize( tsize, tsize ),
+                                 GR_TEXT_HJUSTIFY_CENTER, GR_TEXT_VJUSTIFY_CENTER,
+                                 tsize / 7,
+                                 false, false );
+        }
+    }
+}
+
+
+void TRACK::Draw( EDA_DRAW_PANEL* panel, wxDC* aDC, GR_DRAWMODE aDrawMode,
+                  const wxPoint& aOffset )
+{
+    BOARD * brd = GetBoard( );
+    EDA_COLOR_T color = brd->GetLayerColor(m_Layer);
+
+    if( brd->IsLayerVisible( m_Layer ) == false && !( aDrawMode & GR_HIGHLIGHT ) )
+        return;
+
+#ifdef USE_WX_OVERLAY
+    // If dragged not draw in OnPaint otherwise remains impressed in wxOverlay
+    if( (m_Flags & IS_DRAGGED) && aDC->IsKindOf(wxCLASSINFO(wxPaintDC)))
+      return;
+#endif
+
+    DISPLAY_OPTIONS* displ_opts = (DISPLAY_OPTIONS*) panel->GetDisplayOptions();
+
+    if( ( aDrawMode & GR_ALLOW_HIGHCONTRAST ) && displ_opts->m_ContrastModeDisplay )
+    {
+        LAYER_ID curr_layer = ( (PCB_SCREEN*) panel->GetScreen() )->m_Active_Layer;
+
+        if( !IsOnLayer( curr_layer ) )
+            ColorTurnToDarkDarkGray( &color );
+    }
+
+    if( aDrawMode & GR_HIGHLIGHT )
+        ColorChangeHighlightFlag( &color, !(aDrawMode & GR_AND) );
+
+    ColorApplyHighlightFlag( &color );
+
+    SetAlpha( &color, 150 );
+
+    GRSetDrawMode( aDC, aDrawMode );
+
+    int l_trace = m_Width / 2;
+
+    if( aDC->LogicalToDeviceXRel( l_trace ) <= MIN_DRAW_WIDTH )
+    {
+        GRLine( panel->GetClipBox(), aDC, m_Start + aOffset, m_End + aOffset, 0, color );
+        return;
+    }
+
+    if( !displ_opts->m_DisplayPcbTrackFill || GetState( FORCE_SKETCH ) )
+    {
+        GRCSegm( panel->GetClipBox(), aDC, m_Start + aOffset, m_End + aOffset, m_Width, color );
+    }
+    else
+    {
+        GRFillCSegm( panel->GetClipBox(), aDC, m_Start.x + aOffset.x,
+                     m_Start.y + aOffset.y,
+                     m_End.x + aOffset.x, m_End.y + aOffset.y, m_Width, color );
+    }
+
+    if( panel->GetScreen()->m_IsPrinting )
+        return;
+
+    // Show clearance for tracks, not for zone segments
+    if( ShowClearance( displ_opts, this ) )
+    {
+        GRCSegm( panel->GetClipBox(), aDC, m_Start + aOffset, m_End + aOffset,
+                 m_Width + (GetClearance() * 2), color );
+    }
+
+    DrawShortNetname( panel, aDC, aDrawMode, color );
+}
+
+
+void SEGZONE::Draw( EDA_DRAW_PANEL* panel, wxDC* aDC, GR_DRAWMODE aDrawMode,
+                    const wxPoint& aOffset )
+{
+    DISPLAY_OPTIONS* displ_opts = (DISPLAY_OPTIONS*)panel->GetDisplayOptions();
+
+    if( displ_opts->m_DisplayZonesMode != 0 )
+        return;
+
+    BOARD * brd = GetBoard( );
+    EDA_COLOR_T color = brd->GetLayerColor(m_Layer);
+
+    if( brd->IsLayerVisible( m_Layer ) == false && !( aDrawMode & GR_HIGHLIGHT ) )
+        return;
+
+#ifdef USE_WX_OVERLAY
+    // If dragged not draw in OnPaint otherwise remains impressed in wxOverlay
+    if( (m_Flags & IS_DRAGGED) && aDC->IsKindOf(wxCLASSINFO(wxPaintDC)))
+      return;
+#endif
+
+    if( ( aDrawMode & GR_ALLOW_HIGHCONTRAST ) && displ_opts->m_ContrastModeDisplay )
+    {
+        LAYER_ID curr_layer = ( (PCB_SCREEN*) panel->GetScreen() )->m_Active_Layer;
+
+        if( !IsOnLayer( curr_layer ) )
+            ColorTurnToDarkDarkGray( &color );
+    }
+
+    if( aDrawMode & GR_HIGHLIGHT )
+        ColorChangeHighlightFlag( &color, !(aDrawMode & GR_AND) );
+
+    ColorApplyHighlightFlag( &color );
+
+    SetAlpha( &color, 150 );
+
+    GRSetDrawMode( aDC, aDrawMode );
+
+    int l_trace = m_Width / 2;
+
+    if( aDC->LogicalToDeviceXRel( l_trace ) <= MIN_DRAW_WIDTH )
+    {
+        GRLine( panel->GetClipBox(), aDC, m_Start + aOffset, m_End + aOffset, 0, color );
+        return;
+    }
+
+    if( !displ_opts->m_DisplayPcbTrackFill || GetState( FORCE_SKETCH ) )
+    {
+        GRCSegm( panel->GetClipBox(), aDC, m_Start + aOffset, m_End + aOffset, m_Width, color );
+    }
+    else
+    {
+        GRFillCSegm( panel->GetClipBox(), aDC, m_Start.x + aOffset.x,
+                     m_Start.y + aOffset.y,
+                     m_End.x + aOffset.x, m_End.y + aOffset.y, m_Width, color );
+    }
+
+    // No clearance or netnames for zones
+}
+
+
+void TRACK::ViewGetLayers( int aLayers[], int& aCount ) const
+{
+    // Show the track and its netname on different layers
+    aLayers[0] = GetLayer();
+    aLayers[1] = GetNetnameLayer( aLayers[0] );
+    aCount = 2;
+}
+
+
+unsigned int TRACK::ViewGetLOD( int aLayer ) const
+{
+    // Netnames will be shown only if zoom is appropriate
+    if( IsNetnameLayer( aLayer ) )
+    {
+        return ( 20000000 / ( m_Width + 1 ) );
+    }
+
+    // Other layers are shown without any conditions
+    return 0;
+}
+
+
+void VIA::Draw( EDA_DRAW_PANEL* panel, wxDC* aDC, GR_DRAWMODE aDrawMode, const wxPoint& aOffset )
+{
+    wxCHECK_RET( panel != NULL, wxT( "VIA::Draw panel cannot be NULL." ) );
+
+    int radius;
+    LAYER_ID curr_layer = ( (PCB_SCREEN*) panel->GetScreen() )->m_Active_Layer;
+
+    int fillvia = 0;
+    PCB_BASE_FRAME* frame  = (PCB_BASE_FRAME*) panel->GetParent();
+    PCB_SCREEN*     screen = frame->GetScreen();
+    DISPLAY_OPTIONS* displ_opts = (DISPLAY_OPTIONS*)frame->GetDisplayOptions();
+
+    if( displ_opts->m_DisplayViaFill == FILLED )
+        fillvia = 1;
+
+    GRSetDrawMode( aDC, aDrawMode );
+
+    BOARD * brd =  GetBoard();
+    EDA_COLOR_T color = brd->GetVisibleElementColor( VIAS_VISIBLE + GetViaType() );
+
+    if( brd->IsElementVisible( PCB_VISIBLE(VIAS_VISIBLE + GetViaType()) ) == false
+        && ( color & HIGHLIGHT_FLAG ) != HIGHLIGHT_FLAG )
+        return;
+
+    // Only draw the via if at least one of the layers it crosses is being displayed
+    if( !( brd->GetVisibleLayers() & GetLayerSet() ).any() )
+        return;
+
+    if( displ_opts->m_ContrastModeDisplay )
+    {
+        if( !IsOnLayer( curr_layer ) )
+            ColorTurnToDarkDarkGray( &color );
+    }
+
+    if( aDrawMode & GR_HIGHLIGHT )
+        ColorChangeHighlightFlag( &color, !(aDrawMode & GR_AND) );
+
+    ColorApplyHighlightFlag( &color );
+
+    SetAlpha( &color, 150 );
+
+
+    radius = m_Width >> 1;
+    // for small via size on screen (radius < 4 pixels) draw a simplified shape
+
+    int radius_in_pixels = aDC->LogicalToDeviceXRel( radius );
+
+    bool fast_draw = false;
+
+    // Vias are drawn as a filled circle or a double circle. The hole will be drawn later
+    int drill_radius = GetDrillValue() / 2;
+
+    int inner_radius = radius - aDC->DeviceToLogicalXRel( 2 );
+
+    if( radius_in_pixels < MIN_VIA_DRAW_SIZE )
+    {
+        fast_draw = true;
+        fillvia = false;
+    }
+
+    if( fillvia )
+    {
+        GRFilledCircle( panel->GetClipBox(), aDC, m_Start + aOffset, radius, color );
+    }
+    else
+    {
+        GRCircle( panel->GetClipBox(), aDC, m_Start + aOffset, radius, 0, color );
+
+        if ( fast_draw )
+            return;
+
+        GRCircle( panel->GetClipBox(), aDC, m_Start + aOffset, inner_radius, 0, color );
+    }
+
+    // Draw the via hole if the display option allows it
+    if( displ_opts->m_DisplayViaMode != VIA_HOLE_NOT_SHOW )
+    {
+        // Display all drill holes requested or Display non default holes requested
+        bool show_hole = displ_opts->m_DisplayViaMode == ALL_VIA_HOLE_SHOW;
+
+        if( !show_hole )
+        {
+            NETINFO_ITEM* net = GetNet();
+            int drill_class_value = 0;
+            if( net )
+            {
+                if( GetViaType() == VIA_MICROVIA )
+                    drill_class_value = net->GetMicroViaDrillSize();
+                else
+                    drill_class_value = net->GetViaDrillSize();
+            }
+
+            show_hole = GetDrillValue() != drill_class_value;
+        }
+
+        if( show_hole )
+        {
+            if( fillvia )
+            {
+                bool blackpenstate = false;
+
+                if( screen->m_IsPrinting )
+                {
+                    blackpenstate = GetGRForceBlackPenState();
+                    GRForceBlackPen( false );
+                    color = WHITE;
+                }
+                else
+                {
+                    color = BLACK;     // or DARKGRAY;
+                }
+
+                if( (aDrawMode & GR_XOR) == 0)
+                    GRSetDrawMode( aDC, GR_COPY );
+
+                if( aDC->LogicalToDeviceXRel( drill_radius ) > MIN_DRAW_WIDTH )  // Draw hole if large enough.
+                    GRFilledCircle( panel->GetClipBox(), aDC, m_Start.x + aOffset.x,
+                                    m_Start.y + aOffset.y, drill_radius, 0, color, color );
+
+                if( screen->m_IsPrinting )
+                    GRForceBlackPen( blackpenstate );
+            }
+            else
+            {
+                if( drill_radius < inner_radius )         // We can show the via hole
+                    GRCircle( panel->GetClipBox(), aDC, m_Start + aOffset, drill_radius, 0, color );
+            }
+        }
+    }
+
+    if( ShowClearance( displ_opts, this ) )
+    {
+        GRCircle( panel->GetClipBox(), aDC, m_Start + aOffset, radius + GetClearance(), 0, color );
+    }
+
+    // for Micro Vias, draw a partial cross : X on component layer, or + on copper layer
+    // (so we can see 2 superimposed microvias ):
+    if( GetViaType() == VIA_MICROVIA )
+    {
+        int ax, ay, bx, by;
+
+        if( IsOnLayer( B_Cu ) )
+        {
+            ax = radius; ay = 0;
+            bx = drill_radius; by = 0;
+        }
+        else
+        {
+            ax = ay = (radius * 707) / 1000;
+            bx = by = (drill_radius * 707) / 1000;
+        }
+
+        // lines '|' or '\'
+        GRLine( panel->GetClipBox(), aDC, m_Start.x + aOffset.x - ax,
+                m_Start.y + aOffset.y - ay,
+                m_Start.x + aOffset.x - bx,
+                m_Start.y + aOffset.y - by, 0, color );
+        GRLine( panel->GetClipBox(), aDC, m_Start.x + aOffset.x + bx,
+                m_Start.y + aOffset.y + by,
+                m_Start.x + aOffset.x + ax,
+                m_Start.y + aOffset.y + ay, 0, color );
+
+        // lines - or '/'
+        GRLine( panel->GetClipBox(), aDC, m_Start.x + aOffset.x + ay,
+                m_Start.y + aOffset.y - ax,
+                m_Start.x + aOffset.x + by,
+                m_Start.y + aOffset.y - bx, 0, color );
+        GRLine( panel->GetClipBox(), aDC, m_Start.x + aOffset.x - by,
+                m_Start.y + aOffset.y + bx,
+                m_Start.x + aOffset.x - ay,
+                m_Start.y + aOffset.y + ax, 0, color );
+    }
+
+    // for Buried Vias, draw a partial line : orient depending on layer pair
+    // (so we can see superimposed buried vias ):
+    if( GetViaType() == VIA_BLIND_BURIED )
+    {
+        int ax = 0, ay = radius, bx = 0, by = drill_radius;
+        LAYER_ID layer_top, layer_bottom;
+
+        LayerPair( &layer_top, &layer_bottom );
+
+        // lines for the top layer
+        RotatePoint( &ax, &ay, layer_top * 3600.0 / brd->GetCopperLayerCount( ) );
+        RotatePoint( &bx, &by, layer_top * 3600.0 / brd->GetCopperLayerCount( ) );
+        GRLine( panel->GetClipBox(), aDC, m_Start.x + aOffset.x - ax,
+                m_Start.y + aOffset.y - ay,
+                m_Start.x + aOffset.x - bx,
+                m_Start.y + aOffset.y - by, 0, color );
+
+        // lines for the bottom layer
+        ax = 0; ay = radius; bx = 0; by = drill_radius;
+        RotatePoint( &ax, &ay, layer_bottom * 3600.0 / brd->GetCopperLayerCount( ) );
+        RotatePoint( &bx, &by, layer_bottom * 3600.0 / brd->GetCopperLayerCount( ) );
+        GRLine( panel->GetClipBox(), aDC, m_Start.x + aOffset.x - ax,
+                m_Start.y + aOffset.y - ay,
+                m_Start.x + aOffset.x - bx,
+                m_Start.y + aOffset.y - by, 0, color );
+    }
+
+    // Display the short netname:
+    if( GetNetCode() == NETINFO_LIST::UNCONNECTED )
+        return;
+
+    if( displ_opts->m_DisplayNetNamesMode == 0 || displ_opts->m_DisplayNetNamesMode == 1 )
+        return;
+
+    NETINFO_ITEM* net = GetNet();
+
+    if( net == NULL )
+        return;
+
+    int len = net->GetShortNetname().Len();
+
+    if( len > 0 )
+    {
+        // calculate a good size for the text
+        int tsize = m_Width / len;
+
+        if( aDC->LogicalToDeviceXRel( tsize ) >= MIN_TEXT_SIZE )
+        {
+            tsize = (tsize * 7) / 10;        // small reduction to give a better look, inside via
+
+            if( (aDrawMode & GR_XOR) == 0 )
+                GRSetDrawMode( aDC, GR_COPY );
+
+            EDA_RECT* clipbox = panel->GetClipBox();
+            DrawGraphicHaloText( clipbox, aDC, m_Start,
+                                 color, WHITE, BLACK, net->GetShortNetname(), 0,
+                                 wxSize( tsize, tsize ),
+                                 GR_TEXT_HJUSTIFY_CENTER, GR_TEXT_VJUSTIFY_CENTER,
+                                 tsize / 7, false, false );
+        }
+    }
+}
+
+
+void VIA::ViewGetLayers( int aLayers[], int& aCount ) const
+{
+    aLayers[0] = ITEM_GAL_LAYER( VIAS_HOLES_VISIBLE );
+    aCount = 2;
+
+    // Just show it on common via & via holes layers
+    switch( GetViaType() )
+    {
+    case VIA_THROUGH:
+        aLayers[1] = ITEM_GAL_LAYER( VIA_THROUGH_VISIBLE );
+        break;
+
+    case VIA_BLIND_BURIED:
+        aLayers[1] = ITEM_GAL_LAYER( VIA_BBLIND_VISIBLE );
+        aLayers[2] = m_Layer;
+        aLayers[3] = m_BottomLayer;
+        aCount += 2;
+        break;
+
+    case VIA_MICROVIA:
+        aLayers[1] = ITEM_GAL_LAYER( VIA_MICROVIA_VISIBLE );
+        break;
+
+    default:
+        assert( false );
+        break;
+    }
+}
+
+
+// see class_track.h
+void TRACK::GetMsgPanelInfo( std::vector< MSG_PANEL_ITEM >& aList )
+{
+    wxString msg;
+    BOARD*   board = GetBoard();
+
+    // Display basic infos
+    GetMsgPanelInfoBase( aList );
+
+    // Display full track length (in Pcbnew)
+    if( board )
+    {
+        double trackLen = 0;
+        double lenPadToDie = 0;
+        board->MarkTrace( this, NULL, &trackLen, &lenPadToDie, false );
+        msg = ::LengthDoubleToString( trackLen );
+        aList.push_back( MSG_PANEL_ITEM( _( "Length" ), msg, DARKCYAN ) );
+
+        if( lenPadToDie != 0 )
+        {
+            msg = ::LengthDoubleToString( trackLen + lenPadToDie );
+            aList.push_back( MSG_PANEL_ITEM( _( "Full Length" ), msg, DARKCYAN ) );
+
+            msg = ::LengthDoubleToString( lenPadToDie );
+            aList.push_back( MSG_PANEL_ITEM( _( "Pad To Die Length" ), msg, DARKCYAN ) );
+        }
+    }
+
+    NETCLASSPTR netclass = GetNetClass();
+
+    if( netclass )
+    {
+        aList.push_back( MSG_PANEL_ITEM( _( "NC Name" ), netclass->GetName(), DARKMAGENTA ) );
+        aList.push_back( MSG_PANEL_ITEM( _( "NC Clearance" ),
+                                         ::CoordinateToString( netclass->GetClearance(), true ),
+                                         DARKMAGENTA ) );
+        aList.push_back( MSG_PANEL_ITEM( _( "NC Width" ),
+                                         ::CoordinateToString( netclass->GetTrackWidth(), true ),
+                                         DARKMAGENTA ) );
+        aList.push_back( MSG_PANEL_ITEM( _( "NC Via Size" ),
+                                         ::CoordinateToString( netclass->GetViaDiameter(), true ),
+                                         DARKMAGENTA ) );
+        aList.push_back( MSG_PANEL_ITEM( _( "NC Via Drill"),
+                                         ::CoordinateToString( netclass->GetViaDrill(), true ),
+                                         DARKMAGENTA ) );
+    }
+}
+
+void TRACK::GetMsgPanelInfoBase_Common( std::vector< MSG_PANEL_ITEM >& aList )
+{
+    wxString msg;
+
+    // Display Net Name
+    if( GetBoard() )
+    {
+        NETINFO_ITEM* net = GetNet();
+
+        if( net )
+            msg = net->GetNetname();
+        else
+            msg = wxT( "<noname>" );
+
+        aList.push_back( MSG_PANEL_ITEM( _( "NetName" ), msg, RED ) );
+
+        // Display net code : (useful in test or debug)
+        msg.Printf( wxT( "%d.%d" ), GetNetCode(), GetSubNet() );
+        aList.push_back( MSG_PANEL_ITEM( _( "NetCode" ), msg, RED ) );
+    }
+
+#if defined(DEBUG)
+
+    // Display the flags
+    msg.Printf( wxT( "0x%08X" ), m_Flags );
+    aList.push_back( MSG_PANEL_ITEM( wxT( "Flags" ), msg, BLUE ) );
+
+#if 0
+    // Display start and end pointers:
+    msg.Printf( wxT( "%p" ), start );
+    aList.push_back( MSG_PANEL_ITEM( wxT( "start ptr" ), msg, BLUE ) );
+    msg.Printf( wxT( "%p" ), end );
+    aList.push_back( MSG_PANEL_ITEM( wxT( "end ptr" ), msg, BLUE ) );
+    // Display this ptr
+    msg.Printf( wxT( "%p" ), this );
+    aList.push_back( MSG_PANEL_ITEM( wxT( "this" ), msg, BLUE ) );
+#endif
+
+#if 0
+    // Display start and end positions:
+    msg.Printf( wxT( "%d %d" ), m_Start.x, m_Start.y );
+    aList.push_back( MSG_PANEL_ITEM( wxT( "Start pos" ), msg, BLUE ) );
+    msg.Printf( wxT( "%d %d" ), m_End.x, m_End.y );
+    aList.push_back( MSG_PANEL_ITEM( wxT( "End pos" ), msg, BLUE ) );
+#endif
+
+#endif  // defined(DEBUG)
+
+    // Display the State member
+    msg = wxT( ". . " );
+
+    if( GetState( TRACK_LOCKED ) )
+        msg[0] = 'L';
+
+    if( GetState( TRACK_AR ) )
+        msg[2] = 'A';
+
+    aList.push_back( MSG_PANEL_ITEM( _( "Status" ), msg, MAGENTA ) );
+}
+
+void TRACK::GetMsgPanelInfoBase( std::vector< MSG_PANEL_ITEM >& aList )
+{
+    wxString msg;
+    BOARD* board = GetBoard();
+
+    aList.push_back( MSG_PANEL_ITEM( _( "Type" ), _( "Track" ), DARKCYAN ) );
+
+    GetMsgPanelInfoBase_Common( aList );
+
+    // Display layer
+    if( board )
+        msg = board->GetLayerName( m_Layer );
+    else
+        msg.Printf(wxT("%d"), m_Layer );
+
+    aList.push_back( MSG_PANEL_ITEM( _( "Layer" ), msg, BROWN ) );
+
+    // Display width
+    msg = ::CoordinateToString( (unsigned) m_Width );
+
+    aList.push_back( MSG_PANEL_ITEM( _( "Width" ), msg, DARKCYAN ) );
+
+    // Display segment length
+    msg = ::LengthDoubleToString( GetLength() );
+    aList.push_back( MSG_PANEL_ITEM( _( "Segment Length" ), msg, DARKCYAN ) );
+}
+
+void SEGZONE::GetMsgPanelInfoBase( std::vector< MSG_PANEL_ITEM >& aList )
+{
+    wxString msg;
+    BOARD* board = GetBoard();
+
+    aList.push_back( MSG_PANEL_ITEM( _( "Type" ), _( "Zone " ), DARKCYAN ) );
+
+    GetMsgPanelInfoBase_Common( aList );
+
+    // Display layer
+    if( board )
+        msg = board->GetLayerName( m_Layer );
+    else
+        msg.Printf( wxT( "%d" ), m_Layer );
+
+    aList.push_back( MSG_PANEL_ITEM( _( "Layer" ), msg, BROWN ) );
+
+    // Display width
+    msg = ::CoordinateToString( (unsigned) m_Width );
+
+    aList.push_back( MSG_PANEL_ITEM( _( "Width" ), msg, DARKCYAN ) );
+
+    // Display segment length
+    msg = ::LengthDoubleToString( GetLength() );
+    aList.push_back( MSG_PANEL_ITEM( _( "Segment Length" ), msg, DARKCYAN ) );
+}
+
+void VIA::GetMsgPanelInfoBase( std::vector< MSG_PANEL_ITEM >& aList )
+{
+    wxString msg;
+    BOARD*   board = GetBoard();
+
+    switch( GetViaType() )
+    {
+    default:
+    case VIA_NOT_DEFINED:
+        msg =  wxT( "???" ); // Not used yet, does not exist currently
+        break;
+
+    case VIA_MICROVIA:
+        msg = _( "Micro Via" ); // from external layer (TOP or BOTTOM) from
+                                    // the near neighbor inner layer only
+        break;
+
+    case VIA_BLIND_BURIED:
+        msg = _( "Blind/Buried Via" );  // from inner or external to inner
+                                            // or external layer (no restriction)
+        break;
+
+    case VIA_THROUGH:
+        msg =  _( "Through Via" );  // Usual via (from TOP to BOTTOM layer only )
+        break;
+    }
+
+    aList.push_back( MSG_PANEL_ITEM( _( "Type" ), msg, DARKCYAN ) );
+
+    GetMsgPanelInfoBase_Common( aList );
+
+
+    // Display layer pair
+    LAYER_ID top_layer, bottom_layer;
+
+    LayerPair( &top_layer, &bottom_layer );
+
+    if( board )
+        msg = board->GetLayerName( top_layer ) + wxT( "/" )
+            + board->GetLayerName( bottom_layer );
+    else
+        msg.Printf( wxT( "%d/%d" ), top_layer, bottom_layer );
+
+    aList.push_back( MSG_PANEL_ITEM( _( "Layers" ), msg, BROWN ) );
+
+    // Display width
+    msg = ::CoordinateToString( (unsigned) m_Width );
+
+    // Display diameter value:
+    aList.push_back( MSG_PANEL_ITEM( _( "Diameter" ), msg, DARKCYAN ) );
+
+    // Display drill value
+    int drill_value = GetDrillValue();
+
+    msg = ::CoordinateToString( drill_value );
+
+    wxString title = _( "Drill" );
+    title += wxT( " " );
+
+    bool drl_specific = true;
+
+    if( GetBoard() )
+    {
+        NETINFO_ITEM* net = GetNet();
+        int drill_class_value = 0;
+
+        if( net )
+        {
+            if( GetViaType() == VIA_MICROVIA )
+                drill_class_value = net->GetMicroViaDrillSize();
+            else
+                drill_class_value = net->GetViaDrillSize();
+        }
+
+        drl_specific = drill_value != drill_class_value;
+    }
+
+
+    if( drl_specific )
+        title += _( "(Specific)" );
+    else
+        title += _( "(NetClass)" );
+
+    aList.push_back( MSG_PANEL_ITEM( title, msg, RED ) );
+}
+
+
+bool TRACK::HitTest( const wxPoint& aPosition ) const
+{
+    return TestSegmentHit( aPosition, m_Start, m_End, m_Width / 2 );
+}
+
+bool VIA::HitTest( const wxPoint& aPosition ) const
+{
+    int max_dist = m_Width / 2;
+
+    // rel_pos is aPosition relative to m_Start (or the center of the via)
+    wxPoint rel_pos = aPosition - m_Start;
+    double dist = (double) rel_pos.x * rel_pos.x + (double) rel_pos.y * rel_pos.y;
+    return  dist <= (double) max_dist * max_dist;
+}
+
+
+bool TRACK::HitTest( const EDA_RECT& aRect, bool aContained, int aAccuracy ) const
+{
+    EDA_RECT arect = aRect;
+    arect.Inflate( aAccuracy );
+
+    if( aContained )
+        /* Tracks are a special case:
+         * they are considered inside the rect if one end is inside the rect */
+        return arect.Contains( GetStart() ) || arect.Contains( GetEnd() );
+    else
+        return arect.Intersects( GetStart(), GetEnd() );
+}
+
+bool VIA::HitTest( const EDA_RECT& aRect, bool aContained, int aAccuracy ) const
+{
+    EDA_RECT box;
+    EDA_RECT arect = aRect;
+    arect.Inflate( aAccuracy );
+
+    box.SetOrigin( GetStart() );
+    box.Inflate( GetWidth() / 2 );
+
+    if( aContained )
+        return arect.Contains( box );
+    else
+        return arect.Intersects( box );
+}
+
+
+VIA* TRACK::GetVia( const wxPoint& aPosition, LAYER_ID aLayer)
+{
+    for( VIA* via = GetFirstVia( this ); via; via = GetFirstVia( via->Next() ) )
+    {
+        if( via->HitTest( aPosition ) &&
+                !via->GetState( BUSY | IS_DELETED ) &&
+                ((aLayer == UNDEFINED_LAYER) || (via->IsOnLayer( aLayer ))) )
+            return via;
+    }
+
+    return NULL;
+}
+
+
+VIA* TRACK::GetVia( TRACK* aEndTrace, const wxPoint& aPosition, LSET aLayerMask )
+{
+    for( VIA* via = GetFirstVia( this, aEndTrace ); via; via = GetFirstVia( via->Next() ) )
+    {
+        if( via->HitTest( aPosition ) &&
+            !via->GetState( BUSY | IS_DELETED ) &&
+            ( aLayerMask & via->GetLayerSet() ).any()
+            )
+        {
+            return via;
+        }
+    }
+
+    return NULL;
+}
+
+
+TRACK* TRACK::GetTrack( TRACK* aStartTrace, TRACK* aEndTrace, ENDPOINT_T aEndPoint,
+        bool aSameNetOnly, bool aSequential )
+{
+    const   wxPoint& position = GetEndPoint( aEndPoint );
+    LSET    refLayers = GetLayerSet();
+    TRACK*  previousSegment;
+    TRACK*  nextSegment;
+
+    if( aSequential )
+    {
+        // Simple sequential search: from aStartTrace forward to aEndTrace
+        previousSegment = NULL;
+        nextSegment = aStartTrace;
+    }
+    else
+    {
+        /* Local bidirectional search: from this backward to aStartTrace
+         * AND forward to aEndTrace. The idea is that nearest segments
+         * are found (on average) faster in this way. In fact same-net
+         * segments are almost guaranteed to be found faster, in a global
+         * search, since they are grouped together in the track list */
+        previousSegment = this;
+        nextSegment = this;
+    }
+
+    while( nextSegment || previousSegment )
+    {
+        // Terminate the search in the direction if the netcode mismatches
+        if( aSameNetOnly )
+        {
+            if( nextSegment && (nextSegment->GetNetCode() != GetNetCode()) )
+                nextSegment = NULL;
+            if( previousSegment && (previousSegment->GetNetCode() != GetNetCode()) )
+                previousSegment = NULL;
+        }
+
+        if( nextSegment )
+        {
+            if ( (nextSegment != this) &&
+                 !nextSegment->GetState( BUSY | IS_DELETED ) &&
+                 ( refLayers & nextSegment->GetLayerSet() ).any() )
+            {
+                if( (position == nextSegment->m_Start) ||
+                    (position == nextSegment->m_End) )
+                    return nextSegment;
+            }
+
+            // Keep looking forward
+            if( nextSegment == aEndTrace )
+                nextSegment = NULL;
+            else
+                nextSegment = nextSegment->Next();
+        }
+
+        // Same as above, looking back. During sequential search this branch is inactive
+        if( previousSegment )
+        {
+            if( (previousSegment != this) &&
+                !previousSegment->GetState( BUSY | IS_DELETED ) &&
+                ( refLayers & previousSegment->GetLayerSet() ).any()
+                )
+            {
+                if( (position == previousSegment->m_Start) ||
+                    (position == previousSegment->m_End) )
+                    return previousSegment;
+            }
+
+            if( previousSegment == aStartTrace )
+                previousSegment = NULL;
+            else
+                previousSegment = previousSegment->Back();
+        }
+    }
+
+    return NULL;
+}
+
+
+int TRACK::GetEndSegments( int aCount, TRACK** aStartTrace, TRACK** aEndTrace )
+{
+    TRACK* Track, * via, * segm, * TrackListEnd;
+    int      NbEnds, ii, ok = 0;
+    LSET layerMask;
+
+    if( aCount <= 1 )
+    {
+        *aStartTrace = *aEndTrace = this;
+        return 1;
+    }
+
+    // Calculation of the limit analysis.
+    *aStartTrace = *aEndTrace = NULL;
+    TrackListEnd = Track = this;
+    ii = 0;
+
+    for( ; ( Track != NULL ) && ( ii < aCount ); ii++, Track = Track->Next() )
+    {
+        TrackListEnd   = Track;
+        Track->m_Param = 0;
+    }
+
+    // Calculate the extremes.
+    NbEnds = 0;
+    Track = this;
+    ii = 0;
+
+    for( ; ( Track != NULL ) && ( ii < aCount ); ii++, Track = Track->Next() )
+    {
+        if( Track->Type() == PCB_VIA_T )
+            continue;
+
+        layerMask = Track->GetLayerSet();
+        via = GetVia( TrackListEnd, Track->m_Start, layerMask );
+
+        if( via )
+        {
+            layerMask |= via->GetLayerSet();
+            via->SetState( BUSY, true );
+        }
+
+        Track->SetState( BUSY, true );
+        segm = ::GetTrack( this, TrackListEnd, Track->m_Start, layerMask );
+        Track->SetState( BUSY, false );
+
+        if( via )
+            via->SetState( BUSY, false );
+
+        if( segm == NULL )
+        {
+            switch( NbEnds )
+            {
+            case 0:
+                *aStartTrace = Track; NbEnds++;
+                break;
+
+            case 1:
+                int BeginPad, EndPad;
+                *aEndTrace = Track;
+
+                // Swap ox, oy with fx, fy
+                BeginPad = Track->GetState( BEGIN_ONPAD );
+                EndPad   = Track->GetState( END_ONPAD );
+
+                Track->SetState( BEGIN_ONPAD | END_ONPAD, false );
+
+                if( BeginPad )
+                    Track->SetState( END_ONPAD, true );
+
+                if( EndPad )
+                    Track->SetState( BEGIN_ONPAD, true );
+
+                std::swap( Track->m_Start, Track->m_End );
+                std::swap( Track->start, Track->end );
+                ok = 1;
+                return ok;
+            }
+        }
+
+        layerMask = Track->GetLayerSet();
+        via = GetVia( TrackListEnd, Track->m_End, layerMask );
+
+        if( via )
+        {
+            layerMask |= via->GetLayerSet();
+            via->SetState( BUSY, true );
+        }
+
+        Track->SetState( BUSY, true );
+        segm = ::GetTrack( this, TrackListEnd, Track->m_End, layerMask );
+        Track->SetState( BUSY, false );
+
+        if( via )
+            via->SetState( BUSY, false );
+
+        if( segm == NULL )
+        {
+            switch( NbEnds )
+            {
+            case 0:
+                int BeginPad, EndPad;
+                *aStartTrace = Track;
+                NbEnds++;
+
+                // Swap ox, oy with fx, fy
+                BeginPad = Track->GetState( BEGIN_ONPAD );
+                EndPad   = Track->GetState( END_ONPAD );
+
+                Track->SetState( BEGIN_ONPAD | END_ONPAD, false );
+
+                if( BeginPad )
+                    Track->SetState( END_ONPAD, true );
+
+                if( EndPad )
+                    Track->SetState( BEGIN_ONPAD, true );
+
+                std::swap( Track->m_Start, Track->m_End );
+                std::swap( Track->start, Track->end );
+                break;
+
+            case 1:
+                *aEndTrace = Track;
+                ok = 1;
+                return ok;
+            }
+        }
+    }
+
+    return ok;
+}
+
+
+wxString TRACK::GetSelectMenuText() const
+{
+    wxString text;
+    wxString netname;
+    NETINFO_ITEM* net;
+    BOARD* board = GetBoard();
+
+    // deleting tracks requires all the information we can get to
+    // disambiguate all the choices under the cursor!
+    if( board )
+    {
+        net = GetNet();
+
+        if( net )
+            netname = net->GetNetname();
+        else
+            netname = _("Not found");
+    }
+    else
+    {
+        wxFAIL_MSG( wxT( "TRACK::GetSelectMenuText: BOARD is NULL" ) );
+        netname = wxT( "???" );
+    }
+
+    text.Printf( _("Track %s, net [%s] (%d) on layer %s, length: %s" ),
+                 GetChars( ShowWidth() ), GetChars( netname ),
+                 GetNetCode(), GetChars( GetLayerName() ),
+                 GetChars( ::LengthDoubleToString( GetLength() ) ) );
+
+    return text;
+}
+
+
+#if defined(DEBUG)
+
+wxString TRACK::ShowState( int stateBits )
+{
+    wxString ret;
+
+    if( stateBits & IS_LINKED )
+        ret << wxT( " | IS_LINKED" );
+
+    if( stateBits & TRACK_AR )
+        ret << wxT( " | TRACK_AR" );
+
+    if( stateBits & TRACK_LOCKED )
+        ret << wxT( " | TRACK_LOCKED" );
+
+    if( stateBits & IN_EDIT )
+        ret << wxT( " | IN_EDIT" );
+
+    if( stateBits & IS_DRAGGED )
+        ret << wxT( " | IS_DRAGGED" );
+
+    if( stateBits & DO_NOT_DRAW )
+        ret << wxT( " | DO_NOT_DRAW" );
+
+    if( stateBits & IS_DELETED )
+        ret << wxT( " | IS_DELETED" );
+
+    if( stateBits & BUSY )
+        ret << wxT( " | BUSY" );
+
+    if( stateBits & END_ONPAD )
+        ret << wxT( " | END_ONPAD" );
+
+    if( stateBits & BEGIN_ONPAD )
+        ret << wxT( " | BEGIN_ONPAD" );
+
+    if( stateBits & FLAG0 )
+        ret << wxT( " | FLAG0" );
+
+    if( stateBits & FLAG1 )
+        ret << wxT( " | FLAG1" );
+
+    return ret;
+}
+
+#endif