kicad/pcbnew/router/pns_optimizer.cpp

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/*
* KiRouter - a push-and-(sometimes-)shove PCB router
*
* Copyright (C) 2013-2014 CERN
* Author: Tomasz Wlostowski <tomasz.wlostowski@cern.ch>
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*
* 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 3 of the License, or (at your
* option) any later version.
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*
* 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.
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*
* You should have received a copy of the GNU General Public License along
* with this program. If not, see <http://www.gnu.org/licenses/>.
*/
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#include <boost/foreach.hpp>
#include <geometry/shape_line_chain.h>
#include <geometry/shape_rect.h>
#include "pns_line.h"
#include "pns_node.h"
#include "pns_optimizer.h"
#include "pns_utils.h"
#include "pns_router.h"
/**
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* Cost Estimator Methods
*/
int PNS_COST_ESTIMATOR::CornerCost( const SEG& aA, const SEG& aB )
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{
DIRECTION_45 dir_a( aA ), dir_b( aB );
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switch( dir_a.Angle( dir_b ) )
{
case DIRECTION_45::ANG_OBTUSE:
return 1;
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case DIRECTION_45::ANG_STRAIGHT:
return 0;
case DIRECTION_45::ANG_ACUTE:
return 50;
case DIRECTION_45::ANG_RIGHT:
return 30;
case DIRECTION_45::ANG_HALF_FULL:
return 60;
default:
return 100;
}
}
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int PNS_COST_ESTIMATOR::CornerCost( const SHAPE_LINE_CHAIN& aLine )
{
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int total = 0;
for( int i = 0; i < aLine.SegmentCount() - 1; ++i )
total += CornerCost( aLine.CSegment( i ), aLine.CSegment( i + 1 ) );
return total;
}
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int PNS_COST_ESTIMATOR::CornerCost( const PNS_LINE& aLine )
{
return CornerCost( aLine.CLine() );
}
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void PNS_COST_ESTIMATOR::Add( PNS_LINE& aLine )
{
m_lengthCost += aLine.CLine().Length();
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m_cornerCost += CornerCost( aLine );
}
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void PNS_COST_ESTIMATOR::Remove( PNS_LINE& aLine )
{
m_lengthCost -= aLine.CLine().Length();
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m_cornerCost -= CornerCost( aLine );
}
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void PNS_COST_ESTIMATOR::Replace( PNS_LINE& aOldLine, PNS_LINE& aNewLine )
{
m_lengthCost -= aOldLine.CLine().Length();
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m_cornerCost -= CornerCost( aOldLine );
m_lengthCost += aNewLine.CLine().Length();
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m_cornerCost += CornerCost( aNewLine );
}
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bool PNS_COST_ESTIMATOR::IsBetter( PNS_COST_ESTIMATOR& aOther,
double aLengthTollerance,
double aCornerTollerance ) const
{
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if( aOther.m_cornerCost < m_cornerCost && aOther.m_lengthCost < m_lengthCost )
return true;
else if( aOther.m_cornerCost < m_cornerCost * aCornerTollerance &&
aOther.m_lengthCost < m_lengthCost * aLengthTollerance )
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return true;
return false;
}
/**
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* Optimizer
**/
PNS_OPTIMIZER::PNS_OPTIMIZER( PNS_NODE* aWorld ) :
m_world( aWorld ), m_collisionKindMask( PNS_ITEM::ANY ), m_effortLevel( MERGE_SEGMENTS )
{
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// m_cache = new SHAPE_INDEX_LIST<PNS_ITEM*>();
}
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PNS_OPTIMIZER::~PNS_OPTIMIZER()
{
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// delete m_cache;
}
struct PNS_OPTIMIZER::CACHE_VISITOR
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{
CACHE_VISITOR( const PNS_ITEM* aOurItem, PNS_NODE* aNode, int aMask ) :
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m_ourItem( aOurItem ),
m_collidingItem( NULL ),
m_node( aNode ),
m_mask( aMask )
{}
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bool operator()( PNS_ITEM* aOtherItem )
{
if( !m_mask & aOtherItem->Kind() )
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return true;
int clearance = m_node->GetClearance( aOtherItem, m_ourItem );
if( !aOtherItem->Collide( m_ourItem, clearance ) )
return true;
m_collidingItem = aOtherItem;
return false;
}
const PNS_ITEM* m_ourItem;
PNS_ITEM* m_collidingItem;
PNS_NODE* m_node;
int m_mask;
};
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void PNS_OPTIMIZER::cacheAdd( PNS_ITEM* aItem, bool aIsStatic = false )
{
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if( m_cacheTags.find( aItem ) != m_cacheTags.end() )
return;
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m_cache.Add( aItem );
m_cacheTags[aItem].m_hits = 1;
m_cacheTags[aItem].m_isStatic = aIsStatic;
}
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void PNS_OPTIMIZER::removeCachedSegments( PNS_LINE* aLine, int aStartVertex, int aEndVertex )
{
PNS_LINE::SEGMENT_REFS* segs = aLine->LinkedSegments();
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if( !segs )
return;
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if( aEndVertex < 0 )
aEndVertex += aLine->PointCount();
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for( int i = aStartVertex; i < aEndVertex - 1; i++ )
{
PNS_SEGMENT* s = (*segs)[i];
m_cacheTags.erase( s );
m_cache.Remove( s );
} // *cacheRemove( (*segs)[i] );
}
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void PNS_OPTIMIZER::CacheRemove( PNS_ITEM* aItem )
{
if( aItem->Kind() == PNS_ITEM::LINE )
removeCachedSegments( static_cast<PNS_LINE*>( aItem ) );
}
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void PNS_OPTIMIZER::CacheStaticItem( PNS_ITEM* aItem )
{
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cacheAdd( aItem, true );
}
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void PNS_OPTIMIZER::ClearCache( bool aStaticOnly )
{
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if( !aStaticOnly )
{
m_cacheTags.clear();
m_cache.Clear();
return;
}
for( CachedItemTags::iterator i = m_cacheTags.begin(); i!= m_cacheTags.end(); ++i )
{
if( i->second.m_isStatic )
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{
m_cache.Remove( i->first );
m_cacheTags.erase( i->first );
}
}
}
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bool PNS_OPTIMIZER::checkColliding( PNS_ITEM* aItem, bool aUpdateCache )
{
CACHE_VISITOR v( aItem, m_world, m_collisionKindMask );
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return m_world->CheckColliding( aItem );
// something is wrong with the cache, need to investigate.
m_cache.Query( aItem->Shape(), m_world->GetMaxClearance(), v, false );
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if( !v.m_collidingItem )
{
PNS_NODE::OPT_OBSTACLE obs = m_world->CheckColliding( aItem );
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if( obs )
{
if( aUpdateCache )
cacheAdd( obs->m_item );
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return true;
}
}
else
{
m_cacheTags[v.m_collidingItem].m_hits++;
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return true;
}
return false;
}
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bool PNS_OPTIMIZER::checkColliding( PNS_LINE* aLine, const SHAPE_LINE_CHAIN& aOptPath )
{
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PNS_LINE tmp( *aLine, aOptPath );
return checkColliding( &tmp );
}
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bool PNS_OPTIMIZER::mergeObtuse( PNS_LINE* aLine )
{
SHAPE_LINE_CHAIN& line = aLine->Line();
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int step = line.PointCount() - 3;
int iter = 0;
int segs_pre = line.SegmentCount();
if( step < 0 )
return false;
SHAPE_LINE_CHAIN current_path( line );
while( 1 )
{
iter++;
int n_segs = current_path.SegmentCount();
int max_step = n_segs - 2;
if( step > max_step )
step = max_step;
if( step < 2 )
{
line = current_path;
return current_path.SegmentCount() < segs_pre;
}
bool found_anything = false;
int n = 0;
while( n < n_segs - step )
{
const SEG s1 = current_path.CSegment( n );
const SEG s2 = current_path.CSegment( n + step );
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SEG s1opt, s2opt;
if( DIRECTION_45( s1 ).IsObtuse( DIRECTION_45( s2 ) ) )
{
VECTOR2I ip = *s1.IntersectLines( s2 );
if( s1.Distance( ip ) <= 1 || s2.Distance( ip ) <= 1 )
{
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s1opt = SEG( s1.A, ip );
s2opt = SEG( ip, s2.B );
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}
else
{
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s1opt = SEG( s1.A, ip );
s2opt = SEG( ip, s2.B );
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}
if( DIRECTION_45( s1opt ).IsObtuse( DIRECTION_45( s2opt ) ) )
{
SHAPE_LINE_CHAIN opt_path;
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opt_path.Append( s1opt.A );
opt_path.Append( s1opt.B );
opt_path.Append( s2opt.B );
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PNS_LINE opt_track( *aLine, opt_path );
if( !checkColliding( &opt_track ) )
{
current_path.Replace( s1.Index() + 1, s2.Index(), ip );
// removeCachedSegments(aLine, s1.Index(), s2.Index());
n_segs = current_path.SegmentCount();
found_anything = true;
break;
}
}
}
n++;
}
if( !found_anything )
{
if( step <= 2 )
{
line = current_path;
return line.SegmentCount() < segs_pre;
}
step--;
}
}
return line.SegmentCount() < segs_pre;
}
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bool PNS_OPTIMIZER::mergeFull( PNS_LINE* aLine )
{
SHAPE_LINE_CHAIN& line = aLine->Line();
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int step = line.SegmentCount() - 1;
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int segs_pre = line.SegmentCount();
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line.Simplify();
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if( step < 0 )
return false;
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SHAPE_LINE_CHAIN current_path( line );
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while( 1 )
{
int n_segs = current_path.SegmentCount();
int max_step = n_segs - 2;
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if( step > max_step )
step = max_step;
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if( step < 1 )
break;
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bool found_anything = mergeStep( aLine, current_path, step );
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if( !found_anything )
step--;
}
aLine->SetShape( current_path );
return current_path.SegmentCount() < segs_pre;
}
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bool PNS_OPTIMIZER::Optimize( PNS_LINE* aLine, PNS_LINE* aResult )//, int aStartVertex, int aEndVertex )
{
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if( !aResult )
aResult = aLine;
else
*aResult = *aLine;
m_keepPostures = false;
bool rv = false;
if( m_effortLevel & MERGE_SEGMENTS )
rv |= mergeFull( aResult );
if( m_effortLevel & MERGE_OBTUSE )
rv |= mergeObtuse( aResult );
if( m_effortLevel & SMART_PADS )
rv |= runSmartPads( aResult );
if( m_effortLevel & FANOUT_CLEANUP )
rv |= fanoutCleanup( aResult );
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return rv;
}
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bool PNS_OPTIMIZER::mergeStep( PNS_LINE* aLine, SHAPE_LINE_CHAIN& aCurrentPath, int step )
{
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int n = 0;
int n_segs = aCurrentPath.SegmentCount();
int cost_orig = PNS_COST_ESTIMATOR::CornerCost( aCurrentPath );
if( aLine->SegmentCount() < 4 )
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return false;
DIRECTION_45 orig_start( aLine->CSegment( 0 ) );
DIRECTION_45 orig_end( aLine->CSegment( -1 ) );
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while( n < n_segs - step )
{
const SEG s1 = aCurrentPath.CSegment( n );
const SEG s2 = aCurrentPath.CSegment( n + step );
SHAPE_LINE_CHAIN path[2];
SHAPE_LINE_CHAIN* picked = NULL;
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int cost[2];
for( int i = 0; i < 2; i++ )
{
bool postureMatch = true;
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SHAPE_LINE_CHAIN bypass = DIRECTION_45().BuildInitialTrace( s1.A, s2.B, i );
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cost[i] = INT_MAX;
if( n == 0 && orig_start != DIRECTION_45( bypass.CSegment( 0 ) ) )
postureMatch = false;
else if( n == n_segs - step && orig_end != DIRECTION_45( bypass.CSegment( -1 ) ) )
postureMatch = false;
if( (postureMatch || !m_keepPostures) && !checkColliding( aLine, bypass ) )
{
path[i] = aCurrentPath;
path[i].Replace( s1.Index(), s2.Index(), bypass );
path[i].Simplify();
cost[i] = PNS_COST_ESTIMATOR::CornerCost( path[i] );
}
}
if( cost[0] < cost_orig && cost[0] < cost[1] )
picked = &path[0];
else if( cost[1] < cost_orig )
picked = &path[1];
if( picked )
{
n_segs = aCurrentPath.SegmentCount();
aCurrentPath = *picked;
return true;
}
n++;
}
return false;
}
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PNS_OPTIMIZER::BREAKOUT_LIST PNS_OPTIMIZER::circleBreakouts( int aWidth,
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const SHAPE* aShape, bool aPermitDiagonal ) const
{
BREAKOUT_LIST breakouts;
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for( int angle = 0; angle < 360; angle += 45 )
{
const SHAPE_CIRCLE* cir = static_cast<const SHAPE_CIRCLE*>( aShape );
SHAPE_LINE_CHAIN l;
VECTOR2I p0 = cir->GetCenter();
VECTOR2I v0( cir->GetRadius() * M_SQRT2, 0 );
l.Append( p0 );
l.Append( p0 + v0.Rotate( angle * M_PI / 180.0 ) );
breakouts.push_back( l );
}
return breakouts;
}
PNS_OPTIMIZER::BREAKOUT_LIST PNS_OPTIMIZER::rectBreakouts( int aWidth,
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const SHAPE* aShape, bool aPermitDiagonal ) const
{
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const SHAPE_RECT* rect = static_cast<const SHAPE_RECT*>(aShape);
VECTOR2I s = rect->GetSize(), c = rect->GetPosition() + VECTOR2I( s.x / 2, s.y / 2 );
BREAKOUT_LIST breakouts;
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VECTOR2I d_offset;
d_offset.x = ( s.x > s.y ) ? ( s.x - s.y ) / 2 : 0;
d_offset.y = ( s.x < s.y ) ? ( s.y - s.x ) / 2 : 0;
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VECTOR2I d_vert = VECTOR2I( 0, s.y / 2 + aWidth );
VECTOR2I d_horiz = VECTOR2I( s.x / 2 + aWidth, 0 );
breakouts.push_back( SHAPE_LINE_CHAIN( c, c + d_horiz ) );
breakouts.push_back( SHAPE_LINE_CHAIN( c, c - d_horiz ) );
breakouts.push_back( SHAPE_LINE_CHAIN( c, c + d_vert ) );
breakouts.push_back( SHAPE_LINE_CHAIN( c, c - d_vert ) );
if( aPermitDiagonal )
{
int l = aWidth + std::min( s.x, s.y ) / 2;
VECTOR2I d_diag;
if( s.x >= s.y )
{
breakouts.push_back( SHAPE_LINE_CHAIN( c, c + d_offset,
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c + d_offset + VECTOR2I( l, l ) ) );
breakouts.push_back( SHAPE_LINE_CHAIN( c, c + d_offset,
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c + d_offset - VECTOR2I( -l, l ) ) );
breakouts.push_back( SHAPE_LINE_CHAIN( c, c - d_offset,
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c - d_offset + VECTOR2I( -l, l ) ) );
breakouts.push_back( SHAPE_LINE_CHAIN( c, c - d_offset,
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c - d_offset - VECTOR2I( l, l ) ) );
}
else
{
// fixme: this could be done more efficiently
breakouts.push_back( SHAPE_LINE_CHAIN( c, c + d_offset,
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c + d_offset + VECTOR2I( l, l ) ) );
breakouts.push_back( SHAPE_LINE_CHAIN( c, c - d_offset,
c - d_offset - VECTOR2I( -l, l ) ) );
breakouts.push_back( SHAPE_LINE_CHAIN( c, c + d_offset,
c + d_offset + VECTOR2I( -l, l ) ) );
breakouts.push_back( SHAPE_LINE_CHAIN( c, c - d_offset,
c - d_offset - VECTOR2I( l, l ) ) );
}
}
return breakouts;
}
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PNS_OPTIMIZER::BREAKOUT_LIST PNS_OPTIMIZER::computeBreakouts( int aWidth,
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const PNS_ITEM* aItem, bool aPermitDiagonal ) const
{
switch( aItem->Kind() )
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{
case PNS_ITEM::VIA:
{
const PNS_VIA* via = static_cast<const PNS_VIA*>( aItem );
return circleBreakouts( aWidth, via->Shape(), aPermitDiagonal );
}
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case PNS_ITEM::SOLID:
{
const SHAPE* shape = aItem->Shape();
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switch( shape->Type() )
{
case SH_RECT:
return rectBreakouts( aWidth, shape, aPermitDiagonal );
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case SH_SEGMENT:
{
const SHAPE_SEGMENT* seg = static_cast<const SHAPE_SEGMENT*> (shape);
const SHAPE_RECT rect = ApproximateSegmentAsRect ( *seg );
return rectBreakouts( aWidth, &rect, aPermitDiagonal );
}
case SH_CIRCLE:
return circleBreakouts( aWidth, shape, aPermitDiagonal );
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default:
break;
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}
}
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default:
break;
}
return BREAKOUT_LIST();
}
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PNS_ITEM* PNS_OPTIMIZER::findPadOrVia( int aLayer, int aNet, const VECTOR2I& aP ) const
{
PNS_JOINT* jt = m_world->FindJoint( aP, aLayer, aNet );
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if( !jt )
return NULL;
BOOST_FOREACH( PNS_ITEM* item, jt->LinkList() )
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{
if( item->OfKind( PNS_ITEM::VIA | PNS_ITEM::SOLID ) )
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return item;
}
return NULL;
}
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int PNS_OPTIMIZER::smartPadsSingle( PNS_LINE* aLine, PNS_ITEM* aPad, bool aEnd, int aEndVertex )
{
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int min_cost = INT_MAX; // PNS_COST_ESTIMATOR::CornerCost( line );
int min_len = INT_MAX;
DIRECTION_45 dir;
const int ForbiddenAngles = DIRECTION_45::ANG_ACUTE | DIRECTION_45::ANG_RIGHT |
DIRECTION_45::ANG_HALF_FULL | DIRECTION_45::ANG_UNDEFINED;
typedef std::pair<int, SHAPE_LINE_CHAIN> RtVariant;
std::vector<RtVariant> variants;
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BREAKOUT_LIST breakouts = computeBreakouts( aLine->Width(), aPad, true );
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SHAPE_LINE_CHAIN line = ( aEnd ? aLine->CLine().Reverse() : aLine->CLine() );
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int p_end = std::min( aEndVertex, std::min( 3, line.PointCount() - 1 ) );
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for( int p = 1; p <= p_end; p++ )
{
BOOST_FOREACH( SHAPE_LINE_CHAIN & l, breakouts ) {
for( int diag = 0; diag < 2; diag++ )
{
SHAPE_LINE_CHAIN v;
SHAPE_LINE_CHAIN connect = dir.BuildInitialTrace( l.CPoint( -1 ),
line.CPoint( p ), diag == 0 );
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DIRECTION_45 dir_bkout( l.CSegment( -1 ) );
if(!connect.SegmentCount())
continue;
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int ang1 = dir_bkout.Angle( DIRECTION_45( connect.CSegment( 0 ) ) );
int ang2 = 0;
if( (ang1 | ang2) & ForbiddenAngles )
continue;
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if( l.Length() > line.Length() )
continue;
v = l;
v.Append( connect );
for( int i = p + 1; i < line.PointCount(); i++ )
v.Append( line.CPoint( i ) );
PNS_LINE tmp( *aLine, v );
int cc = tmp.CountCorners( ForbiddenAngles );
if( cc == 0 )
{
RtVariant vp;
vp.first = p;
vp.second = aEnd ? v.Reverse() : v;
vp.second.Simplify();
variants.push_back( vp );
}
}
}
}
SHAPE_LINE_CHAIN l_best;
bool found = false;
int p_best = -1;
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BOOST_FOREACH( RtVariant& vp, variants )
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{
PNS_LINE tmp( *aLine, vp.second );
int cost = PNS_COST_ESTIMATOR::CornerCost( vp.second );
int len = vp.second.Length();
if( !checkColliding( &tmp ) )
{
if( cost < min_cost || ( cost == min_cost && len < min_len ) )
{
l_best = vp.second;
p_best = vp.first;
found = true;
if( cost == min_cost )
min_len = std::min( len, min_len );
min_cost = std::min( cost, min_cost );
}
}
}
if( found )
{
aLine->SetShape( l_best );
return p_best;
}
return -1;
}
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bool PNS_OPTIMIZER::runSmartPads( PNS_LINE* aLine )
{
SHAPE_LINE_CHAIN& line = aLine->Line();
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if( line.PointCount() < 3 )
return false;
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VECTOR2I p_start = line.CPoint( 0 ), p_end = line.CPoint( -1 );
PNS_ITEM* startPad = findPadOrVia( aLine->Layer(), aLine->Net(), p_start );
PNS_ITEM* endPad = findPadOrVia( aLine->Layer(), aLine->Net(), p_end );
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int vtx = -1;
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if( startPad )
vtx = smartPadsSingle( aLine, startPad, false, 3 );
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if( endPad )
smartPadsSingle( aLine, endPad, true,
vtx < 0 ? line.PointCount() - 1 : line.PointCount() - 1 - vtx );
aLine->Line().Simplify();
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return true;
}
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bool PNS_OPTIMIZER::Optimize( PNS_LINE* aLine, int aEffortLevel, PNS_NODE* aWorld )
{
PNS_OPTIMIZER opt( aWorld );
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opt.SetEffortLevel( aEffortLevel );
opt.SetCollisionMask( -1 );
return opt.Optimize( aLine );
}
bool PNS_OPTIMIZER::fanoutCleanup( PNS_LINE* aLine )
{
if( aLine->PointCount() < 3 )
return false;
VECTOR2I p_start = aLine->CPoint( 0 ), p_end = aLine->CPoint( -1 );
PNS_ITEM* startPad = findPadOrVia( aLine->Layer(), aLine->Net(), p_start );
PNS_ITEM* endPad = findPadOrVia( aLine->Layer(), aLine->Net(), p_end );
int thr = aLine->Width() * 10;
int len = aLine->CLine().Length();
if( !startPad )
return false;
bool startMatch = startPad->OfKind( PNS_ITEM::VIA | PNS_ITEM::SOLID );
bool endMatch = false;
if(endPad)
{
endMatch = endPad->OfKind( PNS_ITEM::VIA | PNS_ITEM::SOLID );
} else {
endMatch = aLine->EndsWithVia();
}
if( startMatch && endMatch && len < thr )
{
for(int i = 0; i < 2; i++ )
{
SHAPE_LINE_CHAIN l2 = DIRECTION_45().BuildInitialTrace( p_start, p_end, i );
PNS_ROUTER::GetInstance()->DisplayDebugLine( l2, 4, 10000 );
PNS_LINE repl;
repl = PNS_LINE( *aLine, l2 );
if( !m_world->CheckColliding( &repl ) )
{
aLine->SetShape( repl.CLine() );
return true;
}
}
}
return false;
}