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kicad/pcbnew/clean.cpp

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/*
* This program source code file is part of KiCad, a free EDA CAD application.
*
* Copyright (C) 2004-2010 Jean-Pierre Charras, jean-pierre.charras@gpisa-lab.inpg.fr
* Copyright (C) 2011 Wayne Stambaugh <stambaughw@verizon.net>
* Copyright (C) 1992-2011 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
*/
/**
* @file clean.cpp
* @brief functions to clean tracks: remove null length and redundant segments
*/
#include <fctsys.h>
#include <class_drawpanel.h>
#include <wxPcbStruct.h>
#include <pcbnew.h>
#include <class_board.h>
#include <class_track.h>
#include <connect.h>
#include <dialog_cleaning_options.h>
#include <ratsnest_data.h>
// Helper class used to clean tracks and vias
class TRACKS_CLEANER: CONNECTIONS
{
private:
BOARD *m_Brd;
public:
TRACKS_CLEANER( BOARD * aPcb );
/**
* the cleanup function.
* return true if some item was modified
*/
bool CleanupBoard( PCB_EDIT_FRAME *aFrame, bool aCleanVias,
bool aMergeSegments, bool aDeleteUnconnected);
private:
/**
* Removes redundant vias like vias at same location
* or on pad through
*/
bool clean_vias();
/**
* Removes all the following THT vias on the same position of the
* specified one
*/
bool remove_duplicates_of_via( const VIA *aVia );
/**
* Removes all the following duplicates tracks of the specified one
*/
bool remove_duplicates_of_track( const TRACK *aTrack );
/**
* Removes dangling tracks
*/
bool deleteUnconnectedTracks();
/// Delete null length track segments
bool delete_null_segments();
/// Try to merge the segment to a following collinear one
bool merge_collinear_of_track( TRACK *aSegment );
/**
* Merge collinear segments and remove duplicated and null len segments
*/
bool clean_segments();
/**
* helper function
* Rebuild list of tracks, and connected tracks
* this info must be rebuilt when tracks are erased
*/
void buildTrackConnectionInfo();
/**
* helper function
* merge aTrackRef and aCandidate, when possible,
* i.e. when they are colinear, same width, and obviously same layer
*/
TRACK* mergeCollinearSegmentIfPossible( TRACK* aTrackRef,
TRACK* aCandidate, ENDPOINT_T aEndType );
const ZONE_CONTAINER* zoneForTrackEndpoint( const TRACK *aTrack,
ENDPOINT_T aEndPoint );
bool testTrackEndpointDangling( TRACK *aTrack, ENDPOINT_T aEndPoint );
};
/* Install the cleanup dialog frame to know what should be cleaned
*/
void PCB_EDIT_FRAME::Clean_Pcb()
{
DIALOG_CLEANING_OPTIONS dlg( this );
if( dlg.ShowModal() != wxID_OK )
return;
// Old model has to be refreshed, GAL normally does not keep updating it
if( IsGalCanvasActive() )
Compile_Ratsnest( NULL, false );
wxBusyCursor( dummy );
TRACKS_CLEANER cleaner( GetBoard() );
cleaner.CleanupBoard( this, dlg.m_cleanVias, dlg.m_mergeSegments,
dlg.m_deleteUnconnectedSegm );
// There is a chance that some of tracks have changed their nets, so rebuild ratsnest from scratch
if( IsGalCanvasActive() )
GetBoard()->GetRatsnest()->ProcessBoard();
m_canvas->Refresh( true );
}
/* Main cleaning function.
* Delete
* - Redundant points on tracks (merge aligned segments)
* - vias on pad
* - null length segments
* Create segments when track ends are incorrectly connected:
* i.e. when a track end covers a pad or a via but is not exactly on the pad or the via center
*/
bool TRACKS_CLEANER::CleanupBoard( PCB_EDIT_FRAME *aFrame,
bool aCleanVias,
bool aMergeSegments,
bool aDeleteUnconnected )
{
bool modified = false;
// delete redundant vias
modified |= (aCleanVias && clean_vias());
// Remove null segments and intermediate points on aligned segments
modified |= (aMergeSegments && clean_segments());
// Delete dangling tracks
if( aDeleteUnconnected && deleteUnconnectedTracks() )
{
modified = true ;
// Removed tracks can leave aligned segments
// (when a T was formed by tracks and the "vertical" segment
// is removed;
if( aMergeSegments )
clean_segments();
}
if( modified )
{
// Clear undo and redo lists to avoid inconsistencies between lists
aFrame->GetScreen()->ClearUndoRedoList();
aFrame->SetCurItem( NULL );
aFrame->Compile_Ratsnest( NULL, true );
aFrame->OnModify();
}
return modified;
}
TRACKS_CLEANER::TRACKS_CLEANER( BOARD * aPcb ): CONNECTIONS( aPcb )
{
m_Brd = aPcb;
// Build connections info
BuildPadsList();
buildTrackConnectionInfo();
}
void TRACKS_CLEANER::buildTrackConnectionInfo()
{
BuildTracksCandidatesList( m_Brd->m_Track, NULL);
// clear flags and variables used in cleanup
for( TRACK *track = m_Brd->m_Track; track != NULL; track = track->Next() )
{
track->start = NULL;
track->end = NULL;
track->m_PadsConnected.clear();
track->SetState( START_ON_PAD|END_ON_PAD|BUSY, false );
}
// Build connections info tracks to pads
SearchTracksConnectedToPads();
for( TRACK *track = m_Brd->m_Track; track != NULL; track = track->Next() )
{
// Mark track if connected to pads
for( unsigned jj = 0; jj < track->m_PadsConnected.size(); jj++ )
{
D_PAD * pad = track->m_PadsConnected[jj];
if( pad->HitTest( track->GetStart() ) )
{
track->start = pad;
track->SetState( START_ON_PAD, true );
}
if( pad->HitTest( track->GetEnd() ) )
{
track->end = pad;
track->SetState( END_ON_PAD, true );
}
}
}
}
bool TRACKS_CLEANER::remove_duplicates_of_via( const VIA *aVia )
{
bool modified = false;
// Search and delete others vias at same location
VIA* next_via;
for( VIA* alt_via = GetFirstVia( aVia->Next() ); alt_via != NULL;
alt_via = next_via )
{
next_via = GetFirstVia( alt_via->Next() );
if( (alt_via->GetViaType() == VIA_THROUGH) &&
(alt_via->GetStart() == aVia->GetStart()) )
{
// delete via
m_Brd->GetRatsnest()->Remove( alt_via );
alt_via->ViewRelease();
alt_via->DeleteStructure();
modified = true;
}
}
return modified;
}
bool TRACKS_CLEANER::clean_vias()
{
bool modified = false;
for( VIA* via = GetFirstVia( m_Brd->m_Track ); via != NULL;
via = GetFirstVia( via->Next() ) )
{
// Correct via m_End defects (if any), should never happen
if( via->GetStart() != via->GetEnd() )
{
wxFAIL_MSG( wxT( "Via with mismatching ends" ) );
via->SetEnd( via->GetStart() );
}
/* Important: these cleanups only do thru hole vias, they don't
* (yet) handle high density interconnects */
if( via->GetViaType() != VIA_THROUGH )
{
modified |= remove_duplicates_of_via( via );
/* To delete through Via on THT pads at same location
* Examine the list of connected pads:
* if one through pad is found, the via can be removed */
for( unsigned ii = 0; ii < via->m_PadsConnected.size(); ++ii )
{
const D_PAD *pad = via->m_PadsConnected[ii];
const LSET all_cu = LSET::AllCuMask();
if( (pad->GetLayerSet() & all_cu) == all_cu )
{
// redundant: delete the via
m_Brd->GetRatsnest()->Remove( via );
via->ViewRelease();
via->DeleteStructure();
modified = true;
break;
}
}
}
}
return modified;
}
/// Utility for checking if a track/via ends on a zone
const ZONE_CONTAINER* TRACKS_CLEANER::zoneForTrackEndpoint( const TRACK *aTrack,
ENDPOINT_T aEndPoint )
{
// Vias are special cased, since they get a layer range, not a single one
LAYER_ID top_layer, bottom_layer;
const VIA* via = dyn_cast<const VIA*>( aTrack );
if( via )
via->LayerPair( &top_layer, &bottom_layer );
else
{
top_layer = aTrack->GetLayer();
bottom_layer = top_layer;
}
return m_Brd->HitTestForAnyFilledArea( aTrack->GetEndPoint( aEndPoint ),
top_layer, bottom_layer, aTrack->GetNetCode() );
}
/** Utility: does the endpoint unconnected processed for one endpoint of one track
* Returns true if the track must be deleted, false if not necessarily */
bool TRACKS_CLEANER::testTrackEndpointDangling( TRACK *aTrack, ENDPOINT_T aEndPoint )
{
bool flag_erase = false;
TRACK* other = aTrack->GetTrack( m_Brd->m_Track, NULL, aEndPoint, true, false );
if( (other == NULL) && (zoneForTrackEndpoint( aTrack, aEndPoint ) == NULL) )
flag_erase = true; // Start endpoint is neither on pad, zone or other track
else // segment, via or zone connected to this end
{
// Fill connectivity informations
if( aEndPoint == ENDPOINT_START )
aTrack->start = other;
else
aTrack->end = other;
/* If a via is connected to this end, test if this via has a second item connected.
* If not, remove the current segment (the via would then become
* unconnected and remove on the following pass) */
VIA* via = dyn_cast<VIA*>( other );
if( via )
{
// search for another segment following the via
aTrack->SetState( BUSY, true );
other = via->GetTrack( m_Brd->m_Track, NULL, aEndPoint, true, false );
// There is a via on the start but it goes nowhere
if( (other == NULL) &&
(zoneForTrackEndpoint( via, aEndPoint ) == NULL) )
flag_erase = true;
aTrack->SetState( BUSY, false );
}
}
return flag_erase;
}
/*
* Delete dangling tracks
* Vias:
* If a via is only connected to a dangling track, it also will be removed
*/
bool TRACKS_CLEANER::deleteUnconnectedTracks()
{
if( m_Brd->m_Track == NULL )
return false;
bool modified = false;
bool item_erased;
do // Iterate when at least one track is deleted
{
item_erased = false;
TRACK* next_track;
for( TRACK *track = m_Brd->m_Track; track != NULL; track = next_track )
{
next_track = track->Next();
bool flag_erase = false; // Start without a good reason to erase it
/* if a track endpoint is not connected to a pad, test if
* the endpoint is connected to another track or to a zone.
* For via test, an enhancement could be to test if
* connected to 2 items on different layers. Currently
* a via must be connected to 2 items, that can be on the
* same layer */
// Check if there is nothing attached on the start
if( !(track->GetState( START_ON_PAD )) )
flag_erase |= testTrackEndpointDangling( track, ENDPOINT_START );
// Check if there is nothing attached on the end
if( !(track->GetState( END_ON_PAD )) )
flag_erase |= testTrackEndpointDangling( track, ENDPOINT_END );
if( flag_erase )
{
// remove segment from board
m_Brd->GetRatsnest()->Remove( track );
track->ViewRelease();
track->DeleteStructure();
/* keep iterating, because a track connected to the deleted track
* now perhaps is not connected and should be deleted */
item_erased = true;
modified = true;
}
}
} while( item_erased );
return modified;
}
// Delete null length track segments
bool TRACKS_CLEANER::delete_null_segments()
{
TRACK *nextsegment;
bool modified = false;
// Delete null segments
for( TRACK *segment = m_Brd->m_Track; segment; segment = nextsegment )
{
nextsegment = segment->Next();
if( segment->IsNull() ) // Length segment = 0; delete it
{
m_Brd->GetRatsnest()->Remove( segment );
segment->ViewRelease();
segment->DeleteStructure();
modified = true;
}
}
return modified;
}
bool TRACKS_CLEANER::remove_duplicates_of_track( const TRACK *aTrack )
{
bool modified = false;
TRACK *nextsegment;
for( TRACK *other = aTrack->Next(); other; other = nextsegment )
{
nextsegment = other->Next();
// New netcode, break out (can't be there any other)
if( aTrack->GetNetCode() != other->GetNetCode() )
break;
// Must be of the same type, on the same layer and the endpoints
// must be the same (maybe swapped)
if( (aTrack->Type() != other->Type()) &&
(aTrack->GetLayer() != other->GetLayer()) )
{
if( ((aTrack->GetStart() == other->GetStart()) &&
(aTrack->GetEnd() == other->GetEnd())) ||
((aTrack->GetStart() == other->GetEnd()) &&
(aTrack->GetEnd() == other->GetStart())))
{
m_Brd->GetRatsnest()->Remove( other );
other->ViewRelease();
other->DeleteStructure();
modified = true;
}
}
}
return modified;
}
bool TRACKS_CLEANER::merge_collinear_of_track( TRACK *aSegment )
{
bool merged_this = false;
// *WHY* doesn't C++ have prec and succ (or ++ --) like PASCAL?
for( ENDPOINT_T endpoint = ENDPOINT_START; endpoint <= ENDPOINT_END;
endpoint = ENDPOINT_T( endpoint + 1 ) )
{
// search for a possible segment connected to the current endpoint of the current one
TRACK *other = aSegment->Next();
if( other )
{
other = aSegment->GetTrack( other, NULL, endpoint, true, false );
if( other )
{
// the two segments must have the same width and the other
// cannot be a via
if( (aSegment->GetWidth() == other->GetWidth()) &&
(other->Type() == PCB_TRACE_T) )
{
// There can be only one segment connected
other->SetState( BUSY, true );
TRACK *yet_another = aSegment->GetTrack( m_Brd->m_Track, NULL,
endpoint, true, false );
other->SetState( BUSY, false );
if( !yet_another )
{
// Try to merge them
TRACK *segDelete = mergeCollinearSegmentIfPossible( aSegment,
other, endpoint );
// Merge succesful, the other one has to go away
if( segDelete )
{
m_Brd->GetRatsnest()->Remove( segDelete );
segDelete->ViewRelease();
segDelete->DeleteStructure();
merged_this = true;
}
}
}
}
}
}
return merged_this;
}
// Delete null length segments, and intermediate points ..
bool TRACKS_CLEANER::clean_segments()
{
bool modified = false;
// Easy things first
modified |= delete_null_segments();
// Delete redundant segments, i.e. segments having the same end points and layers
for( TRACK *segment = m_Brd->m_Track; segment; segment = segment->Next() )
modified |= remove_duplicates_of_track( segment );
// merge collinear segments:
TRACK *nextsegment;
for( TRACK *segment = m_Brd->m_Track; segment; segment = nextsegment )
{
nextsegment = segment->Next();
if( segment->Type() == PCB_TRACE_T )
{
bool merged_this = merge_collinear_of_track( segment );
if( merged_this ) // The current segment was modified, retry to merge it again
{
nextsegment = segment->Next();
modified = true;
}
}
}
return modified;
}
/* Utility: check for parallelism between two segments */
static bool parallelism_test( int dx1, int dy1, int dx2, int dy2 )
{
/* The following condition list is ugly and repetitive, but I have
* not a better way to express clearly the trivial cases. Hope the
* compiler optimize it better than always doing the product
* below... */
// test for vertical alignment (easy to handle)
if( dx1 == 0 )
return dx2 == 0;
if( dx2 == 0 )
return dx1 == 0;
// test for horizontal alignment (easy to handle)
if( dy1 == 0 )
return dy2 == 0;
if( dy2 == 0 )
return dy1 == 0;
/* test for alignment in other cases: Do the usual cross product test
* (the same as testing the slope, but without a division) */
return ((double)dy1 * dx2 == (double)dx1 * dy2);
}
/** Function used by clean_segments.
* Test if aTrackRef and aCandidate (which must have a common end) are collinear.
* and see if the common point is not on a pad (i.e. if this common point can be removed).
* the ending point of aTrackRef is the start point (aEndType == START)
* or the end point (aEndType != START)
* flags START_ON_PAD and END_ON_PAD must be set before calling this function
* if the common point can be deleted, this function
* change the common point coordinate of the aTrackRef segm
* (and therefore connect the 2 other ending points)
* and return aCandidate (which can be deleted).
* else return NULL
*/
TRACK* TRACKS_CLEANER::mergeCollinearSegmentIfPossible( TRACK* aTrackRef, TRACK* aCandidate,
ENDPOINT_T aEndType )
{
// First of all, they must be of the same width and must be both actual tracks
if( (aTrackRef->GetWidth() != aCandidate->GetWidth()) ||
(aTrackRef->Type() != PCB_TRACE_T) ||
(aCandidate->Type() != PCB_TRACE_T) )
return NULL;
// Trivial case: exactly the same track
if( ( aTrackRef->GetStart() == aCandidate->GetStart() ) &&
( aTrackRef->GetEnd() == aCandidate->GetEnd() ) )
return aCandidate;
if( ( aTrackRef->GetStart() == aCandidate->GetEnd() ) &&
( aTrackRef->GetEnd() == aCandidate->GetStart() ) )
return aCandidate;
// Weed out non-parallel tracks
if ( !parallelism_test( aTrackRef->GetEnd().x - aTrackRef->GetStart().x,
aTrackRef->GetEnd().y - aTrackRef->GetStart().y,
aCandidate->GetEnd().x - aCandidate->GetStart().x,
aCandidate->GetEnd().y - aCandidate->GetStart().y ) )
return NULL;
/* Here we have 2 aligned segments:
* We must change the pt_ref common point only if not on a pad
* (this function) is called when there is only 2 connected segments,
* and if this point is not on a pad, it can be removed and the 2 segments will be merged
*/
if( aEndType == ENDPOINT_START )
{
// We do not have a pad, which is a always terminal point for a track
if( aTrackRef->GetState( START_ON_PAD) )
return NULL;
/* change the common point coordinate of pt_segm to use the other point
* of pt_segm (pt_segm will be removed later) */
if( aTrackRef->GetStart() == aCandidate->GetStart() )
{
aTrackRef->SetStart( aCandidate->GetEnd());
aTrackRef->start = aCandidate->end;
aTrackRef->SetState( START_ON_PAD, aCandidate->GetState( END_ON_PAD) );
aTrackRef->ViewUpdate( KIGFX::VIEW_ITEM::GEOMETRY );
return aCandidate;
}
else
{
aTrackRef->SetStart( aCandidate->GetStart() );
aTrackRef->start = aCandidate->start;
aTrackRef->SetState( START_ON_PAD, aCandidate->GetState( START_ON_PAD) );
aTrackRef->ViewUpdate( KIGFX::VIEW_ITEM::GEOMETRY );
return aCandidate;
}
}
else // aEndType == END
{
// We do not have a pad, which is a always terminal point for a track
if( aTrackRef->GetState( END_ON_PAD) )
return NULL;
/* change the common point coordinate of pt_segm to use the other point
* of pt_segm (pt_segm will be removed later) */
if( aTrackRef->GetEnd() == aCandidate->GetStart() )
{
aTrackRef->SetEnd( aCandidate->GetEnd() );
aTrackRef->end = aCandidate->end;
aTrackRef->SetState( END_ON_PAD, aCandidate->GetState( END_ON_PAD) );
aTrackRef->ViewUpdate( KIGFX::VIEW_ITEM::GEOMETRY );
return aCandidate;
}
else
{
aTrackRef->SetEnd( aCandidate->GetStart() );
aTrackRef->end = aCandidate->start;
aTrackRef->SetState( END_ON_PAD, aCandidate->GetState( START_ON_PAD) );
aTrackRef->ViewUpdate( KIGFX::VIEW_ITEM::GEOMETRY );
return aCandidate;
}
}
return NULL;
}
bool PCB_EDIT_FRAME::RemoveMisConnectedTracks()
{
/* finds all track segments which are mis-connected (to more than one net).
* When such a bad segment is found, it is flagged to be removed.
* All tracks having at least one flagged segment are removed.
*/
TRACK* segment;
TRACK* other;
TRACK* next;
int net_code_s, net_code_e;
bool isModified = false;
for( segment = GetBoard()->m_Track; segment; segment = segment->Next() )
{
segment->SetState( FLAG0, false );
// find the netcode for segment using anything connected to the "start" of "segment"
net_code_s = -1;
if( segment->start && segment->start->Type()==PCB_PAD_T )
{
// get the netcode of the pad to propagate.
net_code_s = ((D_PAD*)(segment->start))->GetNetCode();
}
else
{
other = segment->GetTrack( GetBoard()->m_Track, NULL, ENDPOINT_START, false, false );
if( other )
net_code_s = other->GetNetCode();
}
if( net_code_s < 0 )
continue; // the "start" of segment is not connected
// find the netcode for segment using anything connected to the "end" of "segment"
net_code_e = -1;
if( segment->end && segment->end->Type()==PCB_PAD_T )
{
net_code_e = ((D_PAD*)(segment->end))->GetNetCode();
}
else
{
other = segment->GetTrack( GetBoard()->m_Track, NULL, ENDPOINT_END, false, false );
if( other )
net_code_e = other->GetNetCode();
}
if( net_code_e < 0 )
continue; // the "end" of segment is not connected
// Netcodes do not agree, so mark the segment as "to be removed"
if( net_code_s != net_code_e )
{
segment->SetState( FLAG0, true );
}
}
// Remove tracks having a flagged segment
for( segment = GetBoard()->m_Track; segment; segment = next )
{
next = segment->Next();
if( segment->GetState( FLAG0 ) ) // Segment is flagged to be removed
{
segment->SetState( FLAG0, false );
isModified = true;
GetBoard()->m_Status_Pcb = 0;
Remove_One_Track( NULL, segment );
// the current segment is deleted,
// we do not know the next "not yet tested" segment,
// so restart to the beginning
next = GetBoard()->m_Track;
}
}
return isModified;
}
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