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kicad/pcbnew/track.cpp

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/*****************
* track.cpp
*****************/
#include "fctsys.h"
#include "common.h"
#include "pcbnew.h"
#include "protos.h"
/* Functions to recognize a track.
* A track is a list of connected segments (or/and vias) from a starting to an ending point
* starting and ending points are a pad or a point with more than 2 segments connected
* (and obviously a dangling segment end)
*/
typedef std::vector<TRACK*> TRACK_PTRS; // buffer of item candidates when
// search for items on the same track
/* Local functions */
static void ChainMarkedSegments( BOARD* Pcb, wxPoint ref_pos, int masklayer, TRACK_PTRS* aList );
TRACK* MarkTrace( BOARD* aPcb,
TRACK* aStartSegm,
int* aSegmCount,
int* aTrackLen,
int* aLengthDie,
bool aReorder )
{
int NbSegmBusy;
TRACK_PTRS trackList;
if( aSegmCount )
*aSegmCount = 0;
if( aTrackLen )
*aTrackLen = 0;
if( aStartSegm == NULL )
return NULL;
// Ensure the flag BUSY of all tracks of the board is cleared
// because we use it to mark segments of the track
for( TRACK* track = aPcb->m_Track; track; track = track->Next() )
track->SetState( BUSY, OFF );
/* Set flags of the initial track segment */
aStartSegm->SetState( BUSY, ON );
int layerMask = aStartSegm->ReturnMaskLayer();
trackList.push_back( aStartSegm );
/* Examine the initial track segment : if it is really a segment, this is
* easy.
* If it is a via, one must search for connected segments.
* If <=2, this via connect 2 segments (or is connected to only one
* segment) and this via and these 2 segments are a part of a track.
* If > 2 only this via is flagged (the track has only this via)
*/
if( aStartSegm->Type() == TYPE_VIA )
{
TRACK* Segm1, * Segm2 = NULL, * Segm3 = NULL;
Segm1 = GetTrace( aPcb->m_Track, NULL, aStartSegm->m_Start, layerMask );
if( Segm1 )
{
Segm2 = GetTrace( Segm1->Next(), NULL, aStartSegm->m_Start, layerMask );
}
if( Segm2 )
{
Segm3 = GetTrace( Segm2->Next(), NULL, aStartSegm->m_Start, layerMask );
}
if( Segm3 ) // More than 2 segments are connected to this via. the track" is only this via
{
if( aSegmCount )
*aSegmCount = 1;
return aStartSegm;
}
if( Segm1 ) // search for others segments connected to the initial segment start point
{
layerMask = Segm1->ReturnMaskLayer();
ChainMarkedSegments( aPcb, aStartSegm->m_Start, layerMask, &trackList );
}
if( Segm2 ) // search for others segments connected to the initial segment end point
{
layerMask = Segm2->ReturnMaskLayer();
ChainMarkedSegments( aPcb, aStartSegm->m_Start, layerMask, &trackList );
}
}
else // mark the chain using both ends of the initial segment
{
ChainMarkedSegments( aPcb, aStartSegm->m_Start, layerMask, &trackList );
ChainMarkedSegments( aPcb, aStartSegm->m_End, layerMask, &trackList );
}
// Now examine selected vias and flag them if they are on the track
// If a via is connected to only one or 2 segments, it is flagged (is on the track)
// If a via is connected to more than 2 segments, it is a track end, and it
// is removed from the list
// go through the list backwards.
for( int i = trackList.size() - 1; i>=0; --i )
{
TRACK* via = trackList[i];
if( via->Type() != TYPE_VIA )
continue;
if( via == aStartSegm )
continue;
via->SetState( BUSY, ON ); // Try to flag it. the flag will be cleared later if needed
layerMask = via->ReturnMaskLayer();
TRACK* track = GetTrace( aPcb->m_Track, NULL, via->m_Start, layerMask );
// GetTrace does not consider tracks flagged BUSY.
// So if no connected track found, this via is on the current track
// only: keep it
if( track == NULL )
continue;
/* If a track is found, this via connects also others segments of an
* other track. This case happens when the vias ends the selected
* track but must we consider this via is on the selected track, or
* on an other track.
* (this is important when selecting a track for deletion: must this
* via be deleted or not?)
* We consider here this via on the track if others segment connected
* to this via remain connected when removing this via.
* We search for all others segment connected together:
* if there are on the same layer, the via is on the selected track
* if there are on different layers, the via is on an other track
*/
int layer = track->GetLayer();
while( ( track = GetTrace( track->Next(), NULL, via->m_Start, layerMask ) ) != NULL )
{
if( layer != track->GetLayer() )
{
// The via connects segments of an other track: it is removed
// from list because it is member of an other track
via->SetState( BUSY, OFF );
break;
}
}
}
/* Rearrange the track list in order to have flagged segments linked
* from firstTrack so the NbSegmBusy segments are consecutive segments
* in list, the first item in the full track list is firstTrack, and
* the NbSegmBusy-1 next items (NbSegmBusy when including firstTrack)
* are the flagged segments
*/
NbSegmBusy = 0;
TRACK* firstTrack;
for( firstTrack = aPcb->m_Track; firstTrack; firstTrack = firstTrack->Next() )
{
// Search for the first flagged BUSY segments
if( firstTrack->GetState( BUSY ) )
{
NbSegmBusy = 1;
break;
}
}
if( firstTrack == NULL )
return NULL;
double full_len = 0;
double lenDie = 0;
if( aReorder )
{
DLIST<TRACK>* list = (DLIST<TRACK>*)firstTrack->GetList();
wxASSERT( list );
/* Rearrange the chain starting at firstTrack
* All others flagged items are moved from their position to the end
* of the flagged list
*/
TRACK* next;
for( TRACK* track = firstTrack->Next(); track; track = next )
{
next = track->Next();
if( track->GetState( BUSY ) ) // move it!
{
NbSegmBusy++;
track->UnLink();
list->Insert( track, firstTrack->Next() );
if( aTrackLen )
full_len += track->GetLength();
if( aLengthDie ) // Add now length die.
{
// In fact only 2 pads (maximum) will be taken in account:
// that are on each end of the track, if any
if( track->GetState( BEGIN_ONPAD ) )
{
D_PAD * pad = (D_PAD *) track->start;
lenDie += (double) pad->m_LengthDie;
}
if( track->GetState( END_ONPAD ) )
{
D_PAD * pad = (D_PAD *) track->end;
lenDie += (double) pad->m_LengthDie;
}
}
}
}
}
else if( aTrackLen )
{
NbSegmBusy = 0;
for( TRACK* track = firstTrack; track; track = track->Next() )
{
if( track->GetState( BUSY ) )
{
NbSegmBusy++;
track->SetState( BUSY, OFF );
full_len += track->GetLength();
// Add now length die.
// In fact only 2 pads (maximum) will be taken in account:
// that are on each end of the track, if any
if( track->GetState( BEGIN_ONPAD ) )
{
D_PAD * pad = (D_PAD *) track->start;
lenDie += (double) pad->m_LengthDie;
}
if( track->GetState( END_ONPAD ) )
{
D_PAD * pad = (D_PAD *) track->end;
lenDie += (double) pad->m_LengthDie;
}
}
}
}
if( aTrackLen )
*aTrackLen = wxRound( full_len );
if( aLengthDie )
*aLengthDie = wxRound( lenDie );
if( aSegmCount )
*aSegmCount = NbSegmBusy;
return firstTrack;
}
/**
* Function used by MarkTrace
* - Set the BUSY flag of connected segments, the first search point is
* ref_pos on layers allowed in masque_layer
* - Put segments fount in aList
* Vias are put in list but their flags BUSY is not set
* @param aPcb = the board
* @param aRef_pos = the reference coordinate of the starting search
* @param aLayerMask = the allowed layers for segments to search
* (1 layer when starting point is on a segment, but more than one when
* starting point is on a via)
* @param aList = the track list to fill with points of segments flagged
*/
static void ChainMarkedSegments( BOARD* aPcb,
wxPoint aRef_pos,
int aLayerMask,
TRACK_PTRS* aList )
{
TRACK* pt_segm, // The current segment being analyzed.
* pt_via, // The via identified, eventually destroy
* SegmentCandidate; // The end segment to destroy (or NULL = pt_segm
int NbSegm;
if( aPcb->m_Track == NULL )
return;
/* Set the BUSY flag of all connected segments, first search starting at
* aRef_pos
* Search ends when:
* - a pad is found (end of a track)
* - a segment end has more than one other segment end connected
* - and obviously when no connected item found
* Vias are a special case, because we must see others segment connected
* on others layers and they change the layer mask. They can be a track
* end or not
* They will be analyzer later, and vias on terminal points of the track
* will be considered as part of this track if they do not connect segments
* of an other track together and will be considered as part of an other
* track if when removing the via, the segments of that other track are
* disconnected
*/
for( ; ; )
{
if( aPcb->GetPadFast( aRef_pos, aLayerMask ) != NULL )
return;
/* Test for a via: a via changes the layer mask and can connect a lot
* of segments at location aRef_pos. When found, the via is just
* pushed in list. Vias will be examined later, when all connected
* segment are found and push in list. This is because when a via
* is found we do not know at this time the number of connected items
* and we do not know if this via is on the track or finish the track
*/
pt_via = aPcb->m_Track->GetVia( NULL, aRef_pos, aLayerMask );
if( pt_via )
{
aLayerMask = pt_via->ReturnMaskLayer();
aList->push_back( pt_via );
}
/* Now we search all segments connected to point aRef_pos
* if only 1 segment: this segment is candidate
* if > 1 segment:
* end of track (more than 2 segment connected at this location)
*/
pt_segm = aPcb->m_Track; SegmentCandidate = NULL;
NbSegm = 0;
while( ( pt_segm = GetTrace( pt_segm, NULL, aRef_pos, aLayerMask ) ) != NULL )
{
if( pt_segm->GetState( BUSY ) ) // already found and selected: skip it
{
pt_segm = pt_segm->Next();
continue;
}
if( pt_segm == pt_via ) // just previously found: skip it
{
pt_segm = pt_segm->Next();
continue;
}
NbSegm++;
if( NbSegm == 1 ) /* First time we found a connected item: pt_segm is candidate */
{
SegmentCandidate = pt_segm;
pt_segm = pt_segm->Next();
}
else /* More than 1 segment connected -> this location is an end of the track */
{
return;
}
}
if( SegmentCandidate ) // A candidate is found: flag it an push it in list
{
/* Initialize parameters to search items connected to this
* candidate:
* we must analyze connections to its other end
*/
aLayerMask = SegmentCandidate->ReturnMaskLayer();
if( aRef_pos == SegmentCandidate->m_Start )
{
aRef_pos = SegmentCandidate->m_End;
}
else
{
aRef_pos = SegmentCandidate->m_Start;
}
pt_segm = aPcb->m_Track; /* restart list of tracks to analyze */
/* flag this item an push it in list of selected items */
aList->push_back( SegmentCandidate );
SegmentCandidate->SetState( BUSY, ON );
}
else
{
return;
}
}
}
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