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kicad/pcbnew/connect.cpp

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/**
* @file connect.cpp
* @brief Functions to handle existing tracks in ratsnest calculations.
*/
/*
* This program source code file is part of KiCad, a free EDA CAD application.
*
* 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
* 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 "fctsys.h"
#include "common.h"
#include "pcbcommon.h"
#include "macros.h"
#include "wxBasePcbFrame.h"
#include "class_track.h"
#include "class_board.h"
#include "pcbnew.h"
extern void Merge_SubNets_Connected_By_CopperAreas( BOARD* aPcb );
extern void Merge_SubNets_Connected_By_CopperAreas( BOARD* aPcb, int aNetcode );
/* Local functions */
static void RebuildTrackChain( BOARD* pcb );
// A helper class to handle connection points (i.e. candidates) for tracks
class CONNECTED_POINT
{
private:
TRACK * m_track; // a link to the parent item (track or via)
wxPoint m_point; // the connection point
public:
CONNECTED_POINT( TRACK * aTrack, wxPoint & aPoint)
{
m_track = aTrack;
m_point = aPoint;
}
TRACK * GetTrack() const { return m_track; }
const wxPoint & GetPoint() const { return m_point; }
};
// A helper class to handle connections calculations:
class CONNECTIONS
{
private:
std::vector <TRACK*> m_connected; // List of connected tracks/vias
// to a given track or via
std::vector <CONNECTED_POINT> m_candidates; // List of points to test
// (end points of tracks or vias location )
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
std::vector<D_PAD*> m_sortedPads; // list of sorted pads by X (then Y) coordinate
public:
CONNECTIONS( BOARD * aBrd );
~CONNECTIONS() {};
/** Function BuildPadsList
* Fills m_sortedPads with all pads that be connected to tracks
* pads are sorted by > then Y coordinates to allow fast binary search in list
* @param aNetcode = net code to use to filter pads
* if aNetcode < 0, all pads will be put in list (default)
*/
void BuildPadsList( int aNetcode = -1 );
/**
* 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.
* if aBegin == NULL, use first track in brd list
* if aEnd == NULL, uses all tracks from aBegin in brd list
*/
void BuildCandidatesList( TRACK * aBegin = NULL, TRACK * aEnd = NULL);
/**
* function SearchConnectedTracks
* Fills m_Connected with tracks/vias connected to aTrack
* @param aTrack = track or via to use as reference
*/
int SearchConnectedTracks( const TRACK * aTrack );
/**
* Function GetConnectedTracks
* Copy m_Connected that contains the list of tracks connected
* calculated by SearchConnectedTracks
* in aTrack->m_TracksConnected
* @param aTrack = track or via to fill with connected tracks
*/
void GetConnectedTracks(TRACK * aTrack)
{
aTrack->m_TracksConnected = m_connected;
}
/**
* function SearchConnectedToPads
* Explores the list of pads and adds to m_PadsConnected member
* of each track connected the pad(s) connected to
*/
void SearchConnectedToPads();
/**
* function CollectItemsNearTo
* Used by SearchConnectedToPads
* Fills aList with pads near to aPosition
* near means aPosition to pad position <= aDistMax
* @param aList = list to fill
* @param aPosition = aPosition to use as reference
* @param aDistMax = dist max from aPosition to a candidate to select it
*/
void CollectItemsNearTo( std::vector<CONNECTED_POINT*>& aList,
const wxPoint& aPosition, int aDistMax );
/**
* 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
* Search an item in m_Connected connected to aPoint
* note m_Connected containts usually more than one candidate
* and searchEntryPoint returns an index to one of these candidates
* Others are neightbor of the indexed item.
* @param aPoint is the reference coordinates
* @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 2 cluster (or subnets) are merged 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 );
};
CONNECTIONS::CONNECTIONS( BOARD * aBrd )
{
m_brd = aBrd;
}
/* Fills m_sortedPads with all pads that be connected to tracks
* pads are sorted by X coordinate ( and Y coordinates for same X value )
* aNetcode = net code to filter pads or < 0 to put all pads in list
*/
void CONNECTIONS::BuildPadsList( int aNetcode )
{
// Creates sorted pad list if not exists
m_sortedPads.clear();
if( aNetcode < 0 )
m_brd->GetSortedPadListByXthenYCoord( m_sortedPads );
else
{
std::vector<D_PAD*> buffer;
m_brd->GetSortedPadListByXthenYCoord( buffer );
int icnt = 0;
for( unsigned ii = 0; ii < buffer.size(); ii++ )
{
if( buffer[ii]->GetNet() == aNetcode )
icnt++;
}
m_sortedPads.reserve(icnt);
for( unsigned ii = 0; ii < buffer.size(); ii++ )
{
if( buffer[ii]->GetNet() == aNetcode )
m_sortedPads.push_back( buffer[ii] );
}
}
}
void CONNECTIONS::SearchConnectedToPads()
{
std::vector<CONNECTED_POINT*> candidates;
for( unsigned ii = 0; ii < m_sortedPads.size(); ii++ )
{
D_PAD * pad = m_sortedPads[ii];
candidates.clear();
CollectItemsNearTo( candidates, pad->ReturnShapePos(), pad->m_ShapeMaxRadius );
// add this pad to track.m_PadsConnected, if it is connected
for( unsigned jj = 0; jj < candidates.size(); jj++ )
{
CONNECTED_POINT * item = candidates[jj];
if( (pad->m_layerMask & item->GetTrack()->ReturnMaskLayer()) == 0 )
continue;
if( pad->HitTest( item->GetPoint() ) )
{
item->GetTrack()->m_PadsConnected.push_back( pad );
pad->m_TracksConnected.push_back( item->GetTrack() );
}
}
}
}
void CONNECTIONS::CollectItemsNearTo( std::vector<CONNECTED_POINT*>& aList,
const wxPoint& aPosition, int aDistMax )
{
/* Search items in m_Candidates that position is <= aDistMax from aPosition
* (Rectilinear distance)
* m_Candidates is sorted by X then Y values, so a fast binary search is used
* to locate the "best" entry point in list
* The best entry is a pad having its m_Pos.x == (or near) aPosition.x
* All candidates are near this candidate in list
* So from this entry point, a linear search is made to find all candidates
*/
int idxmax = m_candidates.size()-1;
int delta = m_candidates.size();
if( delta & 1 && delta > 1 )
delta += 1;
delta /= 2;
int idx = delta; // Starting index is the middle of list
while( delta )
{
if( (delta & 1) && ( delta > 1 ) )
delta++;
delta /= 2;
CONNECTED_POINT& item = m_candidates[idx];
if( item.GetPoint().x == aPosition.x )
break; // A good entry point is found. The list can be scanned from this point.
else if( item.GetPoint().x < aPosition.x ) // We should search after this item
{
idx += delta;
if( idx > idxmax )
idx = idxmax;
}
else // We should search before this item
{
idx -= delta;
if( idx < 0 )
idx = 0;
}
}
/* Now explore the candidate list from the "best" entry point found
* (candidate "near" aPosition.x)
* We explore the list until abs(candidate->m_Point.x - aPosition.x) > aDistMax
* because the list is sorted by X position (and for a given X pos, by Y pos)
* Currently a linear search is made because the number of candidates
* having the right X position is usually small
*/
// search next candidates in list
wxPoint diff;
for( int ii = idx; ii <= idxmax; ii++ )
{
CONNECTED_POINT* item = &m_candidates[ii];
diff = item->GetPoint() - aPosition;
if( abs(diff.x) > aDistMax )
break; // Exit: the distance is to long, we cannot find other candidates
if( abs(diff.y) > aDistMax )
continue; // the y distance is to long, but we can find other candidates
// We have here a good candidate: add it
aList.push_back( item );
}
// search previous candidates in list
for( int ii = idx-1; ii >=0; ii-- )
{
CONNECTED_POINT * item = &m_candidates[ii];
diff = item->GetPoint() - aPosition;
if( abs(diff.x) > aDistMax )
break;
if( abs(diff.y) > aDistMax )
continue;
// We have here a good candidate:add it
aList.push_back( item );
}
}
/* sort function used to sort .m_Connected by X the Y values
* items are sorted by X coordinate value,
* and for same X value, by Y coordinate value.
*/
static bool sortConnectedPointByXthenYCoordinates( const CONNECTED_POINT & aRef,
const CONNECTED_POINT & aTst )
{
if( aRef.GetPoint().x == aTst.GetPoint().x )
return aRef.GetPoint().y < aTst.GetPoint().y;
return aRef.GetPoint().x < aTst.GetPoint().x;
}
void CONNECTIONS::BuildCandidatesList( TRACK * aBegin, TRACK * aEnd)
{
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() )
{
if( track->Type() == PCB_VIA_T )
ii++;
else
ii += 2;
m_lastTrack = track;
if( track == aEnd )
break;
}
// Build candidate list
m_candidates.reserve( ii );
for( TRACK* track = aBegin; track; track = track->Next() )
{
CONNECTED_POINT candidate( track, track->m_Start);
m_candidates.push_back( candidate );
if( track->Type() != PCB_VIA_T )
{
CONNECTED_POINT candidate2( track, track->m_End);
m_candidates.push_back( candidate2 );
}
if( track == aEnd )
break;
}
// Sort list by increasing X coordinate,
// and for increasing Y coordinate when items have the same X coordinate
// So candidates to the same location are consecutive in list.
sort( m_candidates.begin(), m_candidates.end(), sortConnectedPointByXthenYCoordinates );
}
int CONNECTIONS::SearchConnectedTracks( const TRACK * aTrack )
{
int count = 0;
m_connected.clear();
int layerMask = aTrack->ReturnMaskLayer();
// Search for connections to starting point:
wxPoint position = aTrack->m_Start;
for( int kk = 0; kk < 2; kk++ )
{
int idx = searchEntryPoint( position );
if ( idx >= 0 )
{
// search after:
for ( unsigned ii = idx; ii < m_candidates.size(); ii ++ )
{
if( m_candidates[ii].GetTrack() == aTrack )
continue;
if( m_candidates[ii].GetPoint() != position )
break;
if( (m_candidates[ii].GetTrack()->ReturnMaskLayer() & layerMask ) != 0 )
m_connected.push_back( m_candidates[ii].GetTrack() );
}
// search before:
for ( int ii = idx-1; ii >= 0; ii -- )
{
if( m_candidates[ii].GetTrack() == aTrack )
continue;
if( m_candidates[ii].GetPoint() != position )
break;
if( (m_candidates[ii].GetTrack()->ReturnMaskLayer() & layerMask ) != 0 )
m_connected.push_back( m_candidates[ii].GetTrack() );
}
}
// Search for connections to ending point:
if( aTrack->Type() == PCB_VIA_T )
break;
position = aTrack->m_End;
}
return count;
}
int CONNECTIONS::searchEntryPoint( const wxPoint & aPoint)
{
// Search the aPoint coordinates in m_Candidates
// m_Candidates is sorted by X then Y values, and a fast binary search is used
int idxmax = m_candidates.size()-1;
int delta = m_candidates.size();
if( delta & 1 && delta > 1 )
delta += 1;
delta /= 2;
int idx = delta; // Starting index is the middle of list
while( delta )
{
if( (delta & 1) && ( delta > 1 ) )
delta++;
delta /= 2;
CONNECTED_POINT & candidate = m_candidates[idx];
if( candidate.GetPoint() == aPoint ) // candidate found
{
return idx;
}
// Not found: test the middle of the remaining sub list
if( candidate.GetPoint().x == aPoint.x ) // Must search considering Y coordinate
{
if(candidate.GetPoint().y < aPoint.y) // Must search after this item
{
idx += delta;
if( idx > idxmax )
idx = idxmax;
}
else // Must search before this item
{
idx -= delta;
if( idx < 0 )
idx = 0;
}
}
else if( candidate.GetPoint().x < aPoint.x ) // Must search after this item
{
idx += delta;
if( idx > idxmax )
idx = idxmax;
}
else // Must search before this item
{
idx -= delta;
if( idx < 0 )
idx = 0;
}
}
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 )
{
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
*/
int CONNECTIONS::Merge_SubNets( int aOldSubNet, int aNewSubNet )
{
TRACK* curr_track;
int change_count = 0;
if( aOldSubNet == aNewSubNet )
return 0;
if( (aOldSubNet > 0) && (aOldSubNet < aNewSubNet) )
EXCHG( aOldSubNet, aNewSubNet );
curr_track = (TRACK*)m_firstTrack;
for( ; curr_track != NULL; curr_track = curr_track->Next() )
{
if( curr_track->GetSubNet() != aOldSubNet )
{
if( curr_track == m_lastTrack )
break;
continue;
}
change_count++;
curr_track->SetSubNet( aNewSubNet );
for( unsigned ii = 0; ii < curr_track->m_PadsConnected.size(); ii++ )
{
D_PAD * pad = curr_track->m_PadsConnected[ii];
if( pad->GetSubNet() == aOldSubNet )
pad->SetSubNet( curr_track->GetSubNet() );
}
if( curr_track == m_lastTrack )
break;
}
return change_count;
}
/* 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 ratsnests will be left active.
*/
void CONNECTIONS::Propagate_SubNets()
{
TRACK* curr_track;
int sub_netcode;
curr_track = (TRACK*)m_firstTrack;
sub_netcode = 1;
curr_track->SetSubNet( sub_netcode );
for( ; curr_track != NULL; curr_track = curr_track->Next() )
{
/* First: handling connections to pads */
for( unsigned ii = 0; ii < curr_track->m_PadsConnected.size(); ii++ )
{
D_PAD * pad = curr_track->m_PadsConnected[ii];
if( curr_track->GetSubNet() ) /* the track segment is already a cluster member */
{
if( pad->GetSubNet() > 0 )
{
/* The pad is already a cluster member, so we can merge the 2 clusters */
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 */
pad->SetSubNet( curr_track->GetSubNet() );
}
}
else /* the track segment is not attached to a cluster */
{
if( pad->GetSubNet() > 0 )
{
/* it is connected to a pad in a cluster, merge this track */
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++;
curr_track->SetSubNet( sub_netcode );
pad->SetSubNet( curr_track->GetSubNet() );
}
}
}
/* Test connections between segments */
for( unsigned ii = 0; ii < curr_track->m_TracksConnected.size(); ii++ )
{
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( track->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 */
track->SetSubNet( curr_track->GetSubNet() );
}
}
else // the current track segment is not yet attached to a cluster
{
if( track->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++;
curr_track->SetSubNet( sub_netcode );
track->SetSubNet( curr_track->GetSubNet() );
}
}
}
if( curr_track == m_lastTrack )
break;
}
}
void PCB_BASE_FRAME::TestConnections()
{
// Clear the cluster identifier for all pads
for( unsigned i = 0; i< m_Pcb->GetPadsCount(); ++i )
{
D_PAD* pad = m_Pcb->m_NetInfo->GetPad(i);
pad->SetZoneSubNet( 0 );
pad->SetSubNet( 0 );
}
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; )
{
// At this point, track is the first track of a given net
int current_net_code = track->GetNet();
// Get last track of the current net
TRACK* lastTrack = track->GetEndNetCode( current_net_code );
if( current_net_code ) // do not spend time if net code = 0 ( dummy net )
connections.Build_CurrNet_SubNets_Connections( track, lastTrack );
track = lastTrack->Next(); // this is now the first track of the next net
}
Merge_SubNets_Connected_By_CopperAreas( m_Pcb );
return;
}
void PCB_BASE_FRAME::TestNetConnection( wxDC* aDC, int aNetCode )
{
wxString msg;
if( aNetCode == 0 )
return;
if( (m_Pcb->m_Status_Pcb & LISTE_RATSNEST_ITEM_OK) == 0 )
Compile_Ratsnest( aDC, true );
// 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);
int pad_net_code = pad->GetNet();
if( pad_net_code < aNetCode )
continue;
if( pad_net_code > aNetCode )
break;
pad->SetSubNet( 0 );
}
m_Pcb->Test_Connections_To_Copper_Areas( aNetCode );
/* Search for the first and the last segment relative to the given net code */
if( m_Pcb->m_Track )
{
CONNECTIONS connections( m_Pcb );
TRACK* firstTrack;
TRACK* lastTrack = NULL;
firstTrack = m_Pcb->m_Track.GetFirst()->GetStartNetCode( aNetCode );
if( firstTrack )
lastTrack = firstTrack->GetEndNetCode( aNetCode );
if( firstTrack && lastTrack ) // i.e. if there are segments
{
connections.Build_CurrNet_SubNets_Connections( firstTrack, lastTrack );
}
}
Merge_SubNets_Connected_By_CopperAreas( m_Pcb, aNetCode );
/* rebuild the active ratsnest for this net */
DrawGeneralRatsnest( aDC, aNetCode );
TestForActiveLinksInRatsnest( aNetCode );
DrawGeneralRatsnest( aDC, aNetCode );
/* Display results */
int net_notconnected_count = 0;
NETINFO_ITEM* net = m_Pcb->FindNet( aNetCode );
for( unsigned ii = net->m_RatsnestStartIdx; ii < net->m_RatsnestEndIdx; ii++ )
{
if( m_Pcb->m_FullRatsnest[ii].IsActive() )
net_notconnected_count++;
}
msg.Printf( wxT( "links %d nc %d net:nc %d" ),
m_Pcb->GetRatsnestsCount(), m_Pcb->GetNoconnectCount(),
net_notconnected_count );
SetStatusText( msg );
return;
}
/* search connections between tracks and pads and propagate pad net codes to the track
* segments.
* Pads netcodes are assumed to be up to date.
*/
void PCB_BASE_FRAME::RecalculateAllTracksNetcode()
{
TRACK* curr_track;
// Build the net info list
GetBoard()->m_NetInfo->BuildListOfNets();
// Reset variables and flags used in computation
curr_track = m_Pcb->m_Track;
for( ; curr_track != NULL; curr_track = curr_track->Next() )
{
curr_track->m_TracksConnected.clear();
curr_track->m_PadsConnected.clear();
curr_track->start = NULL;
curr_track->end = NULL;
curr_track->SetState( BUSY | IN_EDIT | BEGIN_ONPAD | END_ONPAD, OFF );
curr_track->SetZoneSubNet( 0 );
curr_track->SetNet( 0 ); // net code = 0 means not connected
}
// If no pad, reset pointers and netcode, and do nothing else
if( m_Pcb->GetPadsCount() == 0 )
return;
CONNECTIONS connections( m_Pcb );
connections.BuildPadsList();
connections.BuildCandidatesList();
// First pass: build connections between track segments and pads.
connections.SearchConnectedToPads();
/* For tracks connected to at least one pad,
* set the track net code to the pad netcode
*/
curr_track = m_Pcb->m_Track;
for( ; curr_track != NULL; curr_track = curr_track->Next() )
{
if( curr_track->m_PadsConnected.size() )
curr_track->SetNet( curr_track->m_PadsConnected[0]->GetNet() );
}
// Pass 2: build connections between track ends
for( curr_track = m_Pcb->m_Track; curr_track != NULL; curr_track = curr_track->Next() )
{
connections.SearchConnectedTracks( curr_track );
connections.GetConnectedTracks( curr_track );
}
// Propagate net codes from a segment to other connected segments
bool new_pass_request = true; // set to true if a track has its netcode changed from 0
// to a known netcode to re-evaluate netcodes
// of connected items
while( new_pass_request )
{
new_pass_request = false;
for( curr_track = m_Pcb->m_Track; curr_track; curr_track = curr_track->Next() )
{
int netcode = curr_track->GetNet();
if( netcode == 0 )
{ // try to find a connected item having a netcode
for( unsigned kk = 0; kk < curr_track->m_TracksConnected.size(); kk++ )
{
int altnetcode = curr_track->m_TracksConnected[kk]->GetNet();
if( altnetcode )
{
new_pass_request = true;
netcode = altnetcode;
curr_track->SetNet(netcode);
break;
}
}
}
if( netcode ) // this track has a netcode
{ // propagate this netcode to connected tracks having no netcode
for( unsigned kk = 0; kk < curr_track->m_TracksConnected.size(); kk++ )
{
int altnetcode = curr_track->m_TracksConnected[kk]->GetNet();
if( altnetcode == 0 )
{
curr_track->m_TracksConnected[kk]->SetNet(netcode);
new_pass_request = true;
}
}
}
}
}
/* Sort the track list by net codes: */
RebuildTrackChain( m_Pcb );
}
/*
* Function SortTracksByNetCode used in RebuildTrackChain()
* to sort track segments by net code.
*/
static bool SortTracksByNetCode( const TRACK* const & ref, const TRACK* const & compare )
{
return ref->GetNet() < compare->GetNet();
}
/**
* Helper function RebuildTrackChain
* rebuilds the track segment linked list in order to have a chain
* sorted by increasing netcodes.
* @param pcb = board to rebuild
*/
static void RebuildTrackChain( BOARD* pcb )
{
if( pcb->m_Track == NULL )
return;
int item_count = pcb->m_Track.GetCount();
std::vector<TRACK*> trackList;
trackList.reserve( item_count );
for( int i = 0; i < item_count; ++i )
trackList.push_back( pcb->m_Track.PopFront() );
// the list is empty now
wxASSERT( pcb->m_Track == NULL && pcb->m_Track.GetCount()==0 );
sort( trackList.begin(), trackList.end(), SortTracksByNetCode );
// add them back to the list
for( int i = 0; i < item_count; ++i )
pcb->m_Track.PushBack( trackList[i] );
}
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