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Commit 721cdc48 authored by jean-pierre charras's avatar jean-pierre charras
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Pcbnew: connect.cpp: enhanced ( faster and more powerful ) algorithm to... 

Pcbnew: connect.cpp: enhanced ( faster and more powerful ) algorithm to calculate connections between pads.
Code cleaning.
parent 3541335a
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pcbnew/class_track.h
View file @ 721cdc48
......@@ -61,8 +61,8 @@ protected:
int m_Drill; // for vias: via drill (- 1 for default value)
public:
BOARD_ITEM* start; // pointers to a connected item (pad or track)
BOARD_ITEM* end;
BOARD_CONNECTED_ITEM* start; // pointers to a connected item (pad or track)
BOARD_CONNECTED_ITEM* end;
std::vector<TRACK*> m_TracksConnected; // list of other tracks connected to me
int m_Param; // Auxiliary variable ( used in some computations )
......
pcbnew/connect.cpp
View file @ 721cdc48
......@@ -6,7 +6,7 @@
/*
* This program source code file is part of KiCad, a free EDA CAD application.
*
* Copyright (C) 2011 Jean-Pierre Charras, jaen-pierre.charras@gipsa-lab.inpg.com
* Copyright (C) 2011 Jean-Pierre Charras, jean-pierre.charras@gipsa-lab.inpg.com
* Copyright (C) 2004-2011 KiCad Developers, see change_log.txt for contributors.
*
* This program is free software; you can redistribute it and/or
......@@ -43,8 +43,6 @@ extern void Merge_SubNets_Connected_By_CopperAreas( BOARD* aPcb );
extern void Merge_SubNets_Connected_By_CopperAreas( BOARD* aPcb, int aNetcode );
/* Local functions */
static void Propagate_SubNet( TRACK* pt_start_conn, TRACK* pt_end_conn );
static void Build_Pads_Info_Connections_By_Tracks( TRACK* pt_start_conn, TRACK* pt_end_conn );
static void RebuildTrackChain( BOARD* pcb );
......@@ -73,11 +71,28 @@ public:
private:
BOARD * m_brd; // the master board.
const TRACK * m_firstTrack; // The first track used to build m_Candidates
const TRACK * m_lastTrack; // The last track used to build m_Candidates
public:
CONNECTIONS( BOARD * aBrd );
~CONNECTIONS() {};
/** Function Build_CurrNet_SubNets_Connections
* Connections to pads are assumed to be already initialized,
* and are not recalculated
* An be called after a track change (delete or add a track):
* If a track is deleted, the other pointers to pads do not change.
* When a new track is added in track list, its pointers to pads are already initialized
* Builds the subnets inside a net (tracks from aFirstTrack to aFirstTrack).
* subnets are clusters of pads and tracks that are connected together.
* When all tracks are created relative to the net, there is only a cluster
* when not tracks there are a cluster per pad
* @param aFirstTrack = first track of the given net
* @param aLastTrack = last track of the given net
*/
void Build_CurrNet_SubNets_Connections( TRACK* aFirstTrack, TRACK* aLastTrack );
/** Function BuildCandidatesList
* Fills m_Candidates with all connecting points (track ends or via location)
* with tracks from aBegin to aEnd.
......@@ -93,6 +108,22 @@ public:
*/
int SearchConnectedTracks( const TRACK * aTrack );
/**
* Function Propagate_SubNets
* Test a list of tracks, to create or propagate a sub netcode to pads and
* segments connected together.
* The track list must be sorted by nets, and all segments
* from m_firstTrack to m_lastTrack have the same net.
* When 2 items are connected (a track to a pad, or a track to an other track),
* they are grouped in a cluster.
* For pads, this is the .m_physical_connexion member which is a cluster identifier
* For tracks, this is the .m_Subnet member which is a cluster identifier
* For a given net, if all tracks are created, there is only one cluster.
* but if not all tracks are created, there are more than one cluster,
* and some ratsnests will be left active.
*/
void Propagate_SubNets();
private:
/**
* function searchEntryPoint
......@@ -104,6 +135,20 @@ private:
* @return the index of item found or -1 if no candidate
*/
int searchEntryPoint( const wxPoint & aPoint);
/**
* Function Merge_SubNets
* Change a subnet value to a new value, for tracks ans pads which are connected to
* corresponding track for pads and tracks, this is the .m_Subnet member that is tested
* and modified these members are block numbers (or cluster numbers) for a given net
* The result is merging 2 cluster (or subnets) into only one.
* Note: the resulting sub net value is the smallest between aOldSubNet et aNewSubNet
* @return modification count
* @param aOldSubNet = subnet value to modify
* @param aNewSubNet = new subnet value for each item which have old_val as subnet value
*/
int Merge_SubNets( int aOldSubNet, int aNewSubNet );
};
/* sort function used to sort .m_Connected by X the Y values
......@@ -125,11 +170,13 @@ CONNECTIONS::CONNECTIONS( BOARD * aBrd )
void CONNECTIONS::BuildCandidatesList( TRACK * aBegin, TRACK * aEnd)
{
m_Connected.clear();
m_Candidates.clear();
if( aBegin == NULL )
aBegin = m_brd->m_Track;
m_firstTrack = aBegin;
unsigned ii = 0;
// Count candidates ( i.e. end points )
for( const TRACK* track = aBegin; track; track = track->Next() )
......@@ -139,12 +186,13 @@ void CONNECTIONS::BuildCandidatesList( TRACK * aBegin, TRACK * aEnd)
else
ii += 2;
m_lastTrack = track;
if( track == aEnd )
break;
}
// Build candidate list
m_Connected.reserve( ii );
for( TRACK* track = aBegin; track != aEnd; track = track->Next() )
m_Candidates.reserve( ii );
for( TRACK* track = aBegin; track; track = track->Next() )
{
CONNECTED_POINT candidate( track, track->m_Start);
m_Candidates.push_back( candidate );
......@@ -267,283 +315,202 @@ int CONNECTIONS::searchEntryPoint( const wxPoint & aPoint)
return -1;
}
/* Used after a track change (delete a track ou add a track)
* Connections to pads are assumed to be already initialized.
* and are not recalculated
*/
void CONNECTIONS::Build_CurrNet_SubNets_Connections( TRACK* aFirstTrack, TRACK* aLastTrack )
{
/**
* Function Merge_Two_SubNets
* Used by Propagate_SubNet()
* Change a subnet value to a new value, for tracks ans pads which are connected to
* corresponding track for pads and tracks, this is the .m_Subnet member that is tested
* and modified these members are block numbers (or cluster numbers) for a given net
* The result is merging 2 blocks (or subnets)
* @return modification count
* @param old_val = subnet value to modify
* @param new_val = new subnet value for each item which have old_val as subnet value
* @param pt_start_conn = first track segment to test
* @param pt_end_conn = last track segment to test
* If pt_end_conn = NULL: search is made from pt_start_conn to end of linked list
m_firstTrack = aFirstTrack; // The first track used to build m_Candidates
m_lastTrack = aLastTrack; // The last track used to build m_Candidates
TRACK* curr_track;
// Pads subnets are expected already cleared, because this function
// does not know the full list of pads
BuildCandidatesList( aFirstTrack, aLastTrack );
for( curr_track = aFirstTrack; curr_track != NULL; curr_track = curr_track->Next() )
{
// Clear track subnet id (Pads subnets are cleared outside this function)
curr_track->SetSubNet( 0 );
curr_track->m_TracksConnected.clear();
// Update connections between tracks:
SearchConnectedTracks( curr_track );
curr_track->m_TracksConnected = m_Connected;
if( curr_track == aLastTrack )
break;
}
// Creates sub nets (clusters) for the current net:
Propagate_SubNets();
}
/*
* Change a subnet value to a new value, for tracks and pads which are connected to.
* The result is merging 2 clusters (or subnets) into only one cluster.
* Note: the resultig sub net value is the smallest between aOldSubNet et aNewSubNet
*/
static int Merge_Two_SubNets( TRACK* pt_start_conn, TRACK* pt_end_conn, int old_val, int new_val )
int CONNECTIONS::Merge_SubNets( int aOldSubNet, int aNewSubNet )
{
TRACK* pt_conn;
int nb_change = 0;
D_PAD* pt_pad;
TRACK* curr_track;
int change_count = 0;
if( old_val == new_val )
if( aOldSubNet == aNewSubNet )
return 0;
if( (old_val > 0) && (old_val < new_val) )
EXCHG( old_val, new_val );
if( (aOldSubNet > 0) && (aOldSubNet < aNewSubNet) )
EXCHG( aOldSubNet, aNewSubNet );
pt_conn = pt_start_conn;
curr_track = (TRACK*)m_firstTrack;
for( ; pt_conn != NULL; pt_conn = pt_conn->Next() )
for( ; curr_track != NULL; curr_track = curr_track->Next() )
{
if( pt_conn->GetSubNet() != old_val )
if( curr_track->GetSubNet() != aOldSubNet )
{
if( pt_conn == pt_end_conn )
if( curr_track == m_lastTrack )
break;
continue;
}
nb_change++;
pt_conn->SetSubNet( new_val );
change_count++;
curr_track->SetSubNet( aNewSubNet );
if( pt_conn->start && ( pt_conn->start->Type() == PCB_PAD_T) )
BOARD_CONNECTED_ITEM * item = curr_track->start;
if( item && ( item->Type() == PCB_PAD_T) )
{
pt_pad = (D_PAD*) (pt_conn->start);
if( pt_pad->GetSubNet() == old_val )
pt_pad->SetSubNet( pt_conn->GetSubNet() );
if( item->GetSubNet() == aOldSubNet )
item->SetSubNet( curr_track->GetSubNet() );
}
if( pt_conn->end && (pt_conn->end->Type() == PCB_PAD_T) )
item = curr_track->end;
if( item && (item->Type() == PCB_PAD_T) )
{
pt_pad = (D_PAD*) (pt_conn->end);
if( pt_pad->GetSubNet() == old_val )
pt_pad->SetSubNet( pt_conn->GetSubNet() );
if( item->GetSubNet() == aOldSubNet )
item->SetSubNet( curr_track->GetSubNet() );
}
if( pt_conn == pt_end_conn )
if( curr_track == m_lastTrack )
break;
}
return nb_change;
return change_count;
}
/**
* Function Propagate_SubNet
* Test a list of track segments, to create or propagate a sub netcode to pads and
* segments connected together the track list must be sorted by nets, and all segments
* from pt_start_conn to pt_end_conn have the same net when 2 items are connected (a
* track to a pad, or a track to an other track) they are grouped in a cluster.
* for pads, this is the .m_physical_connexion member which is a cluster identifier
* for tracks, this is the .m_Subnet member which is a cluster identifier
/* Test a list of track segments, to create or propagate a sub netcode to pads and
* segments connected together.
* The track list must be sorted by nets, and all segments
* from m_firstTrack to m_lastTrack have the same net
* When 2 items are connected (a track to a pad, or a track to an other track),
* they are grouped in a cluster.
* For pads, this is the .m_physical_connexion member which is a cluster identifier
* For tracks, this is the .m_Subnet member which is a cluster identifier
* For a given net, if all tracks are created, there is only one cluster.
* but if not all tracks are created, there are more than one cluster, and some ratsnest
* will be shown.
* @param pt_start_conn = first track to test
* @param pt_end_conn = last segment to test
* but if not all tracks are created, there are more than one cluster,
* and some ratsnests will be left active.
*/
static void Propagate_SubNet( TRACK* pt_start_conn, TRACK* pt_end_conn )
void CONNECTIONS::Propagate_SubNets()
{
TRACK* pt_conn;
TRACK* curr_track;
int sub_netcode;
D_PAD* pt_pad;
TRACK* pt_other_trace;
BOARD_ITEM* PtStruct;
/* Clear variables used in computations */
pt_conn = pt_start_conn;
for( ; pt_conn != NULL; pt_conn = pt_conn->Next() )
{
pt_conn->SetSubNet( 0 );
PtStruct = pt_conn->start;
if( PtStruct && (PtStruct->Type() == PCB_PAD_T) )
( (D_PAD*) PtStruct )->SetSubNet( 0 );
PtStruct = pt_conn->end;
if( PtStruct && (PtStruct->Type() == PCB_PAD_T) )
( (D_PAD*) PtStruct )->SetSubNet( 0 );
if( pt_conn == pt_end_conn )
break;
}
curr_track = (TRACK*)m_firstTrack;
sub_netcode = 1;
pt_start_conn->SetSubNet( sub_netcode );
curr_track->SetSubNet( sub_netcode );
/* Start of calculation */
pt_conn = pt_start_conn;
for( ; pt_conn != NULL; pt_conn = pt_conn->Next() )
for( ; curr_track != NULL; curr_track = curr_track->Next() )
{
/* First: handling connections to pads */
PtStruct = pt_conn->start;
BOARD_CONNECTED_ITEM* pad = curr_track->start;
for( int ii = 0; ii < 2; ii++ )
{
/* The segment starts on a pad */
if( PtStruct && (PtStruct->Type() == PCB_PAD_T) )
if( pad && (pad->Type() == PCB_PAD_T) )
{
pt_pad = (D_PAD*) PtStruct;
if( pt_conn->GetSubNet() ) /* the track segment is already a cluster member */
if( curr_track->GetSubNet() ) /* the track segment is already a cluster member */
{
if( pt_pad->GetSubNet() > 0 )
if( pad->GetSubNet() > 0 )
{
/* The pad is already a cluster member, so we can merge the 2 clusters */
Merge_Two_SubNets( pt_start_conn, pt_end_conn,
pt_pad->GetSubNet(), pt_conn->GetSubNet() );
Merge_SubNets( pad->GetSubNet(), curr_track->GetSubNet() );
}
else
{
/* The pad is not yet attached to a cluster , so we can add this pad to
* the cluster */
pt_pad->SetSubNet( pt_conn->GetSubNet() );
pad->SetSubNet( curr_track->GetSubNet() );
}
}
else /* the track segment is not attached to a cluster */
{
if( pt_pad->GetSubNet() > 0 )
if( pad->GetSubNet() > 0 )
{
/* it is connected to a pad in a cluster, merge this track */
pt_conn->SetSubNet( pt_pad->GetSubNet() );
curr_track->SetSubNet( pad->GetSubNet() );
}
else
{
/* it is connected to a pad not in a cluster, so we must create a new
* cluster (only with the 2 items: the track and the pad) */
sub_netcode++;
pt_conn->SetSubNet( sub_netcode );
pt_pad->SetSubNet( pt_conn->GetSubNet() );
curr_track->SetSubNet( sub_netcode );
pad->SetSubNet( curr_track->GetSubNet() );
}
}
}
PtStruct = pt_conn->end;
/* The segment end on a pad */
if( PtStruct && (PtStruct->Type() == PCB_PAD_T) )
{
pt_pad = (D_PAD*) PtStruct;
if( pt_conn->GetSubNet() )
{
if( pt_pad->GetSubNet() > 0 )
{
Merge_Two_SubNets( pt_start_conn, pt_end_conn,
pt_pad->GetSubNet(), pt_conn->GetSubNet() );
}
else
{
pt_pad->SetSubNet( pt_conn->GetSubNet() );
}
}
else
{
if( pt_pad->GetSubNet() > 0 )
{
pt_conn->SetSubNet( pt_pad->GetSubNet() );
}
else
{
sub_netcode++;
pt_conn->SetSubNet( sub_netcode );
pt_pad->SetSubNet( pt_conn->GetSubNet() );
}
}
pad = curr_track->end;
}
/* Test connections between segments */
PtStruct = pt_conn->start;
if( PtStruct && (PtStruct->Type() != PCB_PAD_T) )
for( unsigned ii = 0; ii < curr_track->m_TracksConnected.size(); ii++ )
{
/* The segment starts on an other track */
pt_other_trace = (TRACK*) PtStruct;
/* the track segment is already a cluster member */
if( pt_conn->GetSubNet() )
BOARD_CONNECTED_ITEM* track = curr_track->m_TracksConnected[ii];
if( curr_track->GetSubNet() ) // The current track is already a cluster member
{
/* The other track is already a cluster member, so we can merge the 2 clusters */
if( pt_other_trace->GetSubNet() )
if( track->GetSubNet() )
{
Merge_Two_SubNets( pt_start_conn, pt_end_conn,
pt_other_trace->GetSubNet(), pt_conn->GetSubNet() );
Merge_SubNets( track->GetSubNet(), curr_track->GetSubNet() );
}
else
{
/* The other track is not yet attached to a cluster , so we can add this
* other track to the cluster */
pt_other_trace->SetSubNet( pt_conn->GetSubNet() );
track->SetSubNet( curr_track->GetSubNet() );
}
}
else
else // the current track segment is not yet attached to a cluster
{
/* the track segment is not yet attached to a cluster */
if( pt_other_trace->GetSubNet() )
if( track->GetSubNet() )
{
/* The other track is already a cluster member, so we can add the segment
* to the cluster */
pt_conn->SetSubNet( pt_other_trace->GetSubNet() );
// The other track is already a cluster member, so we can add
// the current segment to the cluster
curr_track->SetSubNet( track->GetSubNet() );
}
else
{
/* it is connected to an other segment not in a cluster, so we must
* create a new cluster (only with the 2 track segments) */
sub_netcode++;
pt_conn->SetSubNet( sub_netcode );
pt_other_trace->SetSubNet( pt_conn->GetSubNet() );
curr_track->SetSubNet( sub_netcode );
track->SetSubNet( curr_track->GetSubNet() );
}
}
}
PtStruct = pt_conn->end; // Do the same calculations for the segment end point
if( PtStruct && (PtStruct->Type() != PCB_PAD_T) )
{
pt_other_trace = (TRACK*) PtStruct;
if( pt_conn->GetSubNet() ) /* the track segment is already a cluster member */
{
if( pt_other_trace->GetSubNet() )
{
Merge_Two_SubNets( pt_start_conn, pt_end_conn,
pt_other_trace->GetSubNet(), pt_conn->GetSubNet() );
}
else
{
pt_other_trace->SetSubNet( pt_conn->GetSubNet() );
}
}
else
{
/* the track segment is not yet attached to a cluster */
if( pt_other_trace->GetSubNet() )
{
pt_conn->SetSubNet( pt_other_trace->GetSubNet() );
}
else
{
sub_netcode++;
pt_conn->SetSubNet( sub_netcode );
pt_other_trace->SetSubNet( pt_conn->GetSubNet() );
}
}
}
if( pt_conn == pt_end_conn )
if( curr_track == m_lastTrack )
break;
}
}
void PCB_BASE_FRAME::TestConnections( wxDC* aDC )
{
// Clear the cluster identifier for all pads
......@@ -558,17 +525,19 @@ void PCB_BASE_FRAME::TestConnections( wxDC* aDC )
m_Pcb->Test_Connections_To_Copper_Areas();
// Test existing connections net by net
CONNECTIONS connections( m_Pcb );
for( TRACK* track = m_Pcb->m_Track; track; )
{
// this is the current net because pt_start_conn is the first segment of the net
// At this point, track is the first track of a given net
int current_net_code = track->GetNet();
// this is the last segment of the current net
TRACK* pt_end_conn = track->GetEndNetCode( current_net_code );
// Get last track of the current net
TRACK* lastTrack = track->GetEndNetCode( current_net_code );
Build_Pads_Info_Connections_By_Tracks( track, pt_end_conn );
if( current_net_code ) // do not spend time if net code = 0, this is not a dummy net
connections.Build_CurrNet_SubNets_Connections( track, lastTrack );
track = pt_end_conn->Next(); // this is now the first segment of the next net
track = lastTrack->Next(); // this is now the first track of the next net
}
Merge_SubNets_Connected_By_CopperAreas( m_Pcb );
......@@ -587,7 +556,8 @@ void PCB_BASE_FRAME::TestNetConnection( wxDC* aDC, int aNetCode )
if( (m_Pcb->m_Status_Pcb & LISTE_RATSNEST_ITEM_OK) == 0 )
Compile_Ratsnest( aDC, true );
for( unsigned i = 0; i<m_Pcb->GetPadsCount(); ++i )
// Clear the cluster identifier (subnet) of pads for this net
for( unsigned i = 0; i < m_Pcb->GetPadsCount(); ++i )
{
D_PAD* pad = m_Pcb->m_NetInfo->GetPad(i);
......@@ -607,16 +577,17 @@ void PCB_BASE_FRAME::TestNetConnection( wxDC* aDC, int aNetCode )
/* Search for the first and the last segment relative to the given net code */
if( m_Pcb->m_Track )
{
TRACK* pt_start_conn;
TRACK* pt_end_conn = NULL;
pt_start_conn = m_Pcb->m_Track.GetFirst()->GetStartNetCode( aNetCode );
CONNECTIONS connections( m_Pcb );
TRACK* firstTrack;
TRACK* lastTrack = NULL;
firstTrack = m_Pcb->m_Track.GetFirst()->GetStartNetCode( aNetCode );
if( pt_start_conn )
pt_end_conn = pt_start_conn->GetEndNetCode( aNetCode );
if( firstTrack )
lastTrack = firstTrack->GetEndNetCode( aNetCode );
if( pt_start_conn && pt_end_conn ) // c.a.d. if there are segments
if( firstTrack && lastTrack ) // i.e. if there are segments
{
Build_Pads_Info_Connections_By_Tracks( pt_start_conn, pt_end_conn );
connections.Build_CurrNet_SubNets_Connections( firstTrack, lastTrack );
}
}
......@@ -635,83 +606,10 @@ void PCB_BASE_FRAME::TestNetConnection( wxDC* aDC, int aNetCode )
}
/** Used after a track change (delete a track ou add a track)
* Compute connections (initialize the .start and .end members) for a single net.
* tracks must be sorted by net, as usual
* @param pt_start_conn = first segment of the net
* @param pt_end_conn = last segment of the net
* Connections to pads are assumed to be already initialized.
* If a track is deleted, the other pointers to pads do not change.
* When a track is added, its pointers to pads are already initialized
/* search connections between tracks and pads and propagate pad net codes to the track
* segments.
* Pads netcodes are assumed to be up to date.
*/
static void Build_Pads_Info_Connections_By_Tracks( TRACK* pt_start_conn, TRACK* pt_end_conn )
{
TRACK* Track;
/* Reset the old connections type track to track */
for( Track = pt_start_conn; Track != NULL; Track = Track->Next() )
{
Track->SetSubNet( 0 );
if( Track->GetState( BEGIN_ONPAD ) == 0 )
Track->start = NULL;
if( Track->GetState( END_ONPAD ) == 0 )
Track->end = NULL;
if( Track == pt_end_conn )
break;
}
/* Update connections type track to track */
for( Track = pt_start_conn; Track != NULL; Track = Track->Next() )
{
if( Track->Type() == PCB_VIA_T )
{
// A via can connect many tracks, we must search for all track segments in this net
TRACK* pt_segm;
int layermask = Track->ReturnMaskLayer();
for( pt_segm = pt_start_conn; pt_segm != NULL; pt_segm = pt_segm->Next() )
{
int curlayermask = pt_segm->ReturnMaskLayer();
if( !pt_segm->start && (pt_segm->m_Start == Track->m_Start)
&& ( layermask & curlayermask ) )
{
pt_segm->start = Track;
}
if( !pt_segm->end && (pt_segm->m_End == Track->m_Start)
&& (layermask & curlayermask) )
{
pt_segm->end = Track;
}
if( pt_segm == pt_end_conn )
break;
}
}
if( Track->start == NULL ) // end track not already connected, search a connection
{
Track->start = Track->GetTrace( Track, pt_end_conn, START );
}
if( Track->end == NULL ) // end track not already connected, search a connection
{
Track->end = Track->GetTrace( Track, pt_end_conn, END );
}
if( Track == pt_end_conn )
break;
}
/* Creates sub nets (cluster) for the current net: */
Propagate_SubNet( pt_start_conn, pt_end_conn );
}
void PCB_BASE_FRAME::RecalculateAllTracksNetcode()
{
TRACK* curr_track;
......@@ -735,13 +633,10 @@ void PCB_BASE_FRAME::RecalculateAllTracksNetcode()
return;
}
/**************************************************************/
/* Pass 1: search the connections between track ends and pads */
/**************************************************************/
// Prepare connections calculations between tracks and pads */
m_Pcb->GetSortedPadListByXthenYCoord( sortedPads );
/* Reset variables and flags used in computation */
// Reset variables and flags used in computation
curr_track = m_Pcb->m_Track;
for( ; curr_track != NULL; curr_track = curr_track->Next() )
......@@ -882,7 +777,5 @@ static void RebuildTrackChain( BOARD* pcb )
// add them back to the list
for( int i = 0; i < item_count; ++i )
{
pcb->m_Track.PushBack( trackList[i] );
}
}
pcbnew/editrack.cpp
View file @ 721cdc48
......@@ -994,7 +994,7 @@ void DeleteNullTrackSegments( BOARD* pcb, DLIST<TRACK>& aTrackList )
TRACK* firsttrack = track;
TRACK* oldtrack;
BOARD_ITEM* LockPoint = track->start;
BOARD_CONNECTED_ITEM* LockPoint = track->start;
while( track != NULL )
{
......
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