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kicad/pcbnew/router/pns_diff_pair.cpp

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/*
* KiRouter - a push-and-(sometimes-)shove PCB router
*
* Copyright (C) 2013-2015 CERN
* Author: Tomasz Wlostowski <tomasz.wlostowski@cern.ch>
*
* 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.
*
* 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, see <http://www.gnu.org/licenses/>.
*/
#include <boost/foreach.hpp>
#include <cstdio>
#include <cstdlib>
#include <limits>
#include <geometry/shape.h>
#include <geometry/shape_rect.h>
#include <geometry/shape_circle.h>
#include <geometry/shape_segment.h>
#include "direction.h"
#include "pns_diff_pair.h"
#include "pns_router.h"
#include "pns_solid.h"
#include "pns_utils.h"
class PNS_LINE;
PNS_DP_PRIMITIVE_PAIR::PNS_DP_PRIMITIVE_PAIR( PNS_ITEM* aPrimP, PNS_ITEM* aPrimN )
{
m_primP = aPrimP->Clone();
m_primN = aPrimN->Clone();
m_anchorP = m_primP->Anchor( 0 );
m_anchorN = m_primN->Anchor( 0 );
}
void PNS_DP_PRIMITIVE_PAIR::SetAnchors( const VECTOR2I& aAnchorP, const VECTOR2I& aAnchorN )
{
m_anchorP = aAnchorP;
m_anchorN = aAnchorN;
}
PNS_DP_PRIMITIVE_PAIR::PNS_DP_PRIMITIVE_PAIR( const VECTOR2I& aAnchorP, const VECTOR2I& aAnchorN )
{
m_anchorP = aAnchorP;
m_anchorN = aAnchorN;
m_primP = m_primN = NULL;
}
PNS_DP_PRIMITIVE_PAIR::PNS_DP_PRIMITIVE_PAIR( const PNS_DP_PRIMITIVE_PAIR& aOther )
{
m_primP = m_primN = NULL;
if( aOther.m_primP )
m_primP = aOther.m_primP->Clone();
if( aOther.m_primN )
m_primN = aOther.m_primN->Clone();
m_anchorP = aOther.m_anchorP;
m_anchorN = aOther.m_anchorN;
}
PNS_DP_PRIMITIVE_PAIR& PNS_DP_PRIMITIVE_PAIR::operator=( const PNS_DP_PRIMITIVE_PAIR& aOther )
{
if( aOther.m_primP )
m_primP = aOther.m_primP->Clone();
if( aOther.m_primN )
m_primN = aOther.m_primN->Clone();
m_anchorP = aOther.m_anchorP;
m_anchorN = aOther.m_anchorN;
return *this;
}
PNS_DP_PRIMITIVE_PAIR::~PNS_DP_PRIMITIVE_PAIR()
{
delete m_primP;
delete m_primN;
}
bool PNS_DP_PRIMITIVE_PAIR::Directional() const
{
if( !m_primP )
return false;
return m_primP->OfKind( PNS_ITEM::SEGMENT );
}
DIRECTION_45 PNS_DP_PRIMITIVE_PAIR::anchorDirection( PNS_ITEM* aItem, const VECTOR2I& aP ) const
{
if( !aItem->OfKind ( PNS_ITEM::SEGMENT ) )
return DIRECTION_45();
PNS_SEGMENT* s = static_cast<PNS_SEGMENT*>( aItem );
if( s->Seg().A == aP )
return DIRECTION_45( s->Seg().A - s->Seg().B );
else
return DIRECTION_45( s->Seg().B - s->Seg().A );
}
DIRECTION_45 PNS_DP_PRIMITIVE_PAIR::DirP() const
{
return anchorDirection( m_primP, m_anchorP );
}
DIRECTION_45 PNS_DP_PRIMITIVE_PAIR::DirN() const
{
return anchorDirection( m_primN, m_anchorN );
}
static void drawGw( VECTOR2I p, int color )
{
SHAPE_LINE_CHAIN l;
l.Append( p - VECTOR2I( -50000, -50000 ) );
l.Append( p + VECTOR2I( -50000, -50000 ) );
l.Clear();
l.Append( p - VECTOR2I( 50000, -50000 ) );
l.Append( p + VECTOR2I( 50000, -50000 ) );
}
static DIRECTION_45::AngleType angle( const VECTOR2I &a, const VECTOR2I &b )
{
DIRECTION_45 dir_a( a );
DIRECTION_45 dir_b( b );
return dir_a.Angle( dir_b );
}
static bool checkGap( const SHAPE_LINE_CHAIN &p, const SHAPE_LINE_CHAIN &n, int gap )
{
int i, j;
for( i = 0; i < p.SegmentCount(); i++ )
{
for( j = 0; j < n.SegmentCount() ; j++ )
{
int dist = p.CSegment( i ).Distance( n.CSegment( j ) );
if( dist < gap - 100 )
return false;
}
}
return true;
}
void PNS_DP_GATEWAY::Reverse()
{
m_entryN = m_entryN.Reverse();
m_entryP = m_entryP.Reverse();
}
bool PNS_DIFF_PAIR::BuildInitial( PNS_DP_GATEWAY& aEntry, PNS_DP_GATEWAY &aTarget, bool aPrefDiagonal )
{
SHAPE_LINE_CHAIN p = DIRECTION_45().BuildInitialTrace ( aEntry.AnchorP(), aTarget.AnchorP(), aPrefDiagonal );
SHAPE_LINE_CHAIN n = DIRECTION_45().BuildInitialTrace ( aEntry.AnchorN(), aTarget.AnchorN(), aPrefDiagonal );
int mask = aEntry.AllowedAngles() | DIRECTION_45::ANG_STRAIGHT | DIRECTION_45::ANG_OBTUSE;
SHAPE_LINE_CHAIN sum_n, sum_p;
m_p = p;
m_n = n;
if( aEntry.HasEntryLines() )
{
if( !aEntry.Entry().CheckConnectionAngle( *this, mask ) )
return false;
sum_p = aEntry.Entry().CP();
sum_n = aEntry.Entry().CN();
sum_p.Append( p );
sum_n.Append( n );
}
else
{
sum_p = p;
sum_n = n;
}
mask = aTarget.AllowedAngles() | DIRECTION_45::ANG_STRAIGHT | DIRECTION_45::ANG_OBTUSE;
m_p = sum_p;
m_n = sum_n;
if( aTarget.HasEntryLines() )
{
PNS_DP_GATEWAY t(aTarget) ;
t.Reverse();
if( !CheckConnectionAngle( t.Entry(), mask ) )
return false;
sum_p.Append( t.Entry().CP() );
sum_n.Append( t.Entry().CN() );
}
m_p = sum_p;
m_n = sum_n;
if( !checkGap ( p, n, m_gapConstraint ) )
return false;
if( p.SelfIntersecting() || n.SelfIntersecting() )
return false;
if( p.Intersects( n ) )
return false;
return true;
}
bool PNS_DIFF_PAIR::CheckConnectionAngle( const PNS_DIFF_PAIR& aOther, int aAllowedAngles ) const
{
bool checkP, checkN;
if( m_p.SegmentCount() == 0 || aOther.m_p.SegmentCount() == 0 )
checkP = true;
else
{
DIRECTION_45 p0( m_p.CSegment( -1 ) );
DIRECTION_45 p1( aOther.m_p.CSegment( 0 ) );
checkP = ( p0.Angle( p1 ) & aAllowedAngles ) != 0;
}
if( m_n.SegmentCount() == 0 || aOther.m_n.SegmentCount() == 0 )
checkN = true;
else
{
DIRECTION_45 n0( m_n.CSegment( -1 ) );
DIRECTION_45 n1( aOther.m_n.CSegment( 0 ) );
checkN = ( n0.Angle( n1 ) & aAllowedAngles ) != 0;
}
return checkP && checkN;
}
const PNS_DIFF_PAIR PNS_DP_GATEWAY::Entry() const
{
return PNS_DIFF_PAIR( m_entryP, m_entryN, 0 );
}
void PNS_DP_GATEWAYS::BuildOrthoProjections( PNS_DP_GATEWAYS& aEntries,
const VECTOR2I& aCursorPos, int aOrthoScore )
{
BOOST_FOREACH( PNS_DP_GATEWAY g, aEntries.Gateways() )
{
VECTOR2I midpoint( ( g.AnchorP() + g.AnchorN() ) / 2 );
SEG guide_s( midpoint, midpoint + VECTOR2I( 1, 0 ) );
SEG guide_d( midpoint, midpoint + VECTOR2I( 1, 1 ) );
VECTOR2I proj_s = guide_s.LineProject( aCursorPos );
VECTOR2I proj_d = guide_d.LineProject( aCursorPos );
int dist_s = ( proj_s - aCursorPos ).EuclideanNorm();
int dist_d = ( proj_d - aCursorPos ).EuclideanNorm();
VECTOR2I proj = ( dist_s < dist_d ? proj_s : proj_d );
PNS_DP_GATEWAYS targets( m_gap );
targets.m_viaGap = m_viaGap;
targets.m_viaDiameter = m_viaDiameter;
targets.m_fitVias = m_fitVias;
targets.BuildForCursor( proj );
BOOST_FOREACH( PNS_DP_GATEWAY t, targets.Gateways() )
{
t.SetPriority( aOrthoScore );
m_gateways.push_back( t );
}
}
}
bool PNS_DP_GATEWAYS::FitGateways( PNS_DP_GATEWAYS& aEntry, PNS_DP_GATEWAYS& aTarget,
bool aPrefDiagonal, PNS_DIFF_PAIR& aDp )
{
std::vector<DP_CANDIDATE> candidates;
BOOST_FOREACH( PNS_DP_GATEWAY g_entry, aEntry.Gateways() )
{
BOOST_FOREACH( PNS_DP_GATEWAY g_target, aTarget.Gateways() )
{
for( int attempt = 0; attempt < 2; attempt++ )
{
PNS_DIFF_PAIR l( m_gap );
if( l.BuildInitial( g_entry, g_target, aPrefDiagonal ^ ( attempt ? true : false ) ) )
{
int score = ( attempt == 1 ? -3 : 0 );
score +=g_entry.Priority();
score +=g_target.Priority();
DP_CANDIDATE c;
c.score = score;
c.p = l.CP();
c.n = l.CN();
candidates.push_back( c );
}
}
}
}
int bestScore = -1000;
DP_CANDIDATE best;
bool found = false;
BOOST_FOREACH( DP_CANDIDATE c, candidates )
{
if( c.score > bestScore )
{
bestScore = c.score;
best = c;
found = true;
}
}
if( found )
{
aDp.SetGap( m_gap );
aDp.SetShape( best.p, best.n );
return true;
}
return false;
}
bool PNS_DP_GATEWAYS::checkDiagonalAlignment( const VECTOR2I& a, const VECTOR2I& b ) const
{
VECTOR2I dir ( std::abs (a.x - b.x), std::abs ( a.y - b.y ));
return (dir.x == 0 && dir.y != 0) || (dir.x == dir.y) || (dir.y == 0 && dir.x != 0);
}
void PNS_DP_GATEWAYS::BuildFromPrimitivePair( PNS_DP_PRIMITIVE_PAIR aPair, bool aPreferDiagonal )
{
VECTOR2I majorDirection;
VECTOR2I p0_p, p0_n;
int orthoFanDistance;
int diagFanDistance;
const SHAPE* shP = NULL;
if( aPair.PrimP() == NULL )
{
BuildGeneric( aPair.AnchorP(), aPair.AnchorN(), true );
return;
}
const int pvMask = PNS_ITEM::SOLID | PNS_ITEM::VIA;
if( aPair.PrimP()->OfKind( pvMask ) && aPair.PrimN()->OfKind( pvMask ) )
{
p0_p = aPair.AnchorP();
p0_n = aPair.AnchorN();
shP = aPair.PrimP()->Shape();
}
else if( aPair.PrimP()->OfKind( PNS_ITEM::SEGMENT ) && aPair.PrimN()->OfKind( PNS_ITEM::SEGMENT ) )
{
buildDpContinuation( aPair, aPreferDiagonal );
return;
}
majorDirection = ( p0_p - p0_n ).Perpendicular();
if( shP == NULL )
return;
switch( shP->Type() )
{
case SH_RECT:
{
int w = static_cast<const SHAPE_RECT*>( shP )->GetWidth();
int h = static_cast<const SHAPE_RECT*>( shP )->GetHeight();
if( w < h )
std::swap( w, h );
orthoFanDistance = w * 3/4;
diagFanDistance = ( w - h ) / 2;
break;
}
case SH_SEGMENT:
{
int w = static_cast<const SHAPE_SEGMENT*>( shP )->GetWidth();
SEG s = static_cast<const SHAPE_SEGMENT*>( shP )->GetSeg();
orthoFanDistance = w + ( s.B - s.A ).EuclideanNorm() / 2;
diagFanDistance = ( s.B - s.A ).EuclideanNorm() / 2;
break;
}
default:
BuildGeneric ( p0_p, p0_n, true );
return;
}
if( checkDiagonalAlignment( p0_p, p0_n ) )
{
int padDist = ( p0_p - p0_n ).EuclideanNorm();
for( int k = 0; k < 2; k++ )
{
VECTOR2I dir, dp, dv;
if( k == 0 )
{
dir = majorDirection.Resize( orthoFanDistance );
int d = ( padDist - m_gap ) / 2;
dp = dir.Resize( d );
dv = ( p0_n - p0_p ).Resize( d );
}
else
{
dir = majorDirection.Resize( diagFanDistance );
int d = ( padDist - m_gap ) / 2;
dp = dir.Resize( d );
dv = ( p0_n - p0_p ).Resize( d );
}
for( int i = 0; i < 2; i++ )
{
int sign = i ? -1 : 1;
VECTOR2I gw_p( p0_p + sign * ( dir + dp ) + dv );
VECTOR2I gw_n( p0_n + sign * ( dir + dp ) - dv );
SHAPE_LINE_CHAIN entryP( p0_p, p0_p + sign * dir, gw_p );
SHAPE_LINE_CHAIN entryN( p0_n, p0_n + sign * dir, gw_n );
PNS_DP_GATEWAY gw( gw_p, gw_n, false );
gw.SetEntryLines( entryP, entryN );
gw.SetPriority( 100 - k );
m_gateways.push_back( gw );
}
}
}
BuildGeneric( p0_p, p0_n, true );
}
void PNS_DP_GATEWAYS::BuildForCursor( const VECTOR2I& aCursorPos )
{
int gap = m_fitVias ? m_viaGap + m_viaDiameter : m_gap;
for( int attempt = 0; attempt < 2; attempt++ )
{
for( int i = 0; i < 4; i++ )
{
VECTOR2I dir;
if( !attempt )
{
dir = VECTOR2I( gap, gap ).Resize( gap / 2 );
if( i % 2 == 0 )
dir.x = -dir.x;
if( i / 2 == 0 )
dir.y = -dir.y;
}
else
{
if( i /2 == 0 )
dir = VECTOR2I( gap / 2 * ( ( i % 2 ) ? -1 : 1 ), 0 );
else
dir = VECTOR2I( 0, gap / 2 * ( ( i % 2 ) ? -1 : 1) );
}
if( m_fitVias )
BuildGeneric( aCursorPos + dir, aCursorPos - dir, true, true );
else
m_gateways.push_back( PNS_DP_GATEWAY( aCursorPos + dir,
aCursorPos - dir, attempt ? true : false ) );
drawGw ( aCursorPos + dir, 2 );
drawGw ( aCursorPos - dir, 3 );
}
}
}
void PNS_DP_GATEWAYS::buildEntries( const VECTOR2I& p0_p, const VECTOR2I& p0_n )
{
BOOST_FOREACH( PNS_DP_GATEWAY &g, m_gateways )
{
if( !g.HasEntryLines() )
{
SHAPE_LINE_CHAIN lead_p = DIRECTION_45().BuildInitialTrace ( g.AnchorP(), p0_p, g.IsDiagonal() ).Reverse();
SHAPE_LINE_CHAIN lead_n = DIRECTION_45().BuildInitialTrace ( g.AnchorN(), p0_n, g.IsDiagonal() ).Reverse();
g.SetEntryLines( lead_p, lead_n );
}
}
}
void PNS_DP_GATEWAYS::buildDpContinuation( PNS_DP_PRIMITIVE_PAIR aPair, bool aIsDiagonal )
{
PNS_DP_GATEWAY gw( aPair.AnchorP(), aPair.AnchorN(), aIsDiagonal );
gw.SetPriority( 100 );
m_gateways.push_back( gw );
if( !aPair.Directional() )
return;
DIRECTION_45 dP = aPair.DirP();
DIRECTION_45 dN = aPair.DirN();
int gap = ( aPair.AnchorP() - aPair.AnchorN() ).EuclideanNorm();
VECTOR2I vdP = aPair.AnchorP() + dP.Left().ToVector();
VECTOR2I vdN = aPair.AnchorN() + dN.Left().ToVector();
PNS_SEGMENT* sP = static_cast<PNS_SEGMENT*>( aPair.PrimP() );
VECTOR2I t1, t2;
if( sP->Seg().Side( vdP ) == sP->Seg().Side( vdN ) )
{
t1 = aPair.AnchorP() + dP.Left().ToVector().Resize( gap );
t2 = aPair.AnchorN() + dP.Right().ToVector().Resize( gap );
}
else
{
t1 = aPair.AnchorP() + dP.Right().ToVector().Resize( gap );
t2 = aPair.AnchorN() + dP.Left().ToVector().Resize( gap );
}
PNS_DP_GATEWAY gwL( t2, aPair.AnchorN(), !aIsDiagonal );
SHAPE_LINE_CHAIN ep = dP.BuildInitialTrace( aPair.AnchorP(), t2, !aIsDiagonal );
gwL.SetPriority( 10 );
gwL.SetEntryLines( ep , SHAPE_LINE_CHAIN() );
m_gateways.push_back( gwL );
PNS_DP_GATEWAY gwR( aPair.AnchorP(), t1, !aIsDiagonal );
SHAPE_LINE_CHAIN en = dP.BuildInitialTrace( aPair.AnchorN(), t1, !aIsDiagonal );
gwR.SetPriority( 10) ;
gwR.SetEntryLines( SHAPE_LINE_CHAIN(), en );
m_gateways.push_back( gwR );
}
void PNS_DP_GATEWAYS::BuildGeneric( const VECTOR2I& p0_p, const VECTOR2I& p0_n, bool aBuildEntries, bool aViaMode )
{
SEG st_p[2], st_n[2];
SEG d_n[2], d_p[2];
const int padToGapThreshold = 3;
int padDist = ( p0_p - p0_p ).EuclideanNorm();
st_p[0] = SEG(p0_p + VECTOR2I( -100, 0 ), p0_p + VECTOR2I( 100, 0 ) );
st_n[0] = SEG(p0_n + VECTOR2I( -100, 0 ), p0_n + VECTOR2I( 100, 0 ) );
st_p[1] = SEG(p0_p + VECTOR2I( 0, -100 ), p0_p + VECTOR2I( 0, 100 ) );
st_n[1] = SEG(p0_n + VECTOR2I( 0, -100 ), p0_n + VECTOR2I( 0, 100 ) );
d_p[0] = SEG( p0_p + VECTOR2I( -100, -100 ), p0_p + VECTOR2I( 100, 100 ) );
d_p[1] = SEG( p0_p + VECTOR2I( 100, -100 ), p0_p + VECTOR2I( -100, 100 ) );
d_n[0] = SEG( p0_n + VECTOR2I( -100, -100 ), p0_n + VECTOR2I( 100, 100 ) );
d_n[1] = SEG( p0_n + VECTOR2I( 100, -100 ), p0_n + VECTOR2I( -100, 100 ) );
// midpoint exit & side-by exits
for( int i = 0; i < 2; i++ )
{
bool straightColl = st_p[i].Collinear( st_n[i] );
bool diagColl = d_p[i].Collinear( d_n[i] );
if( straightColl || diagColl )
{
VECTOR2I dir = ( p0_n - p0_p ).Resize( m_gap / 2 );
VECTOR2I m = ( p0_p + p0_n ) / 2;
int prio = ( padDist > padToGapThreshold * m_gap ? 2 : 1);
if( !aViaMode )
{
m_gateways.push_back( PNS_DP_GATEWAY( m - dir, m + dir, diagColl, DIRECTION_45::ANG_RIGHT, prio ) );
dir = ( p0_n - p0_p ).Resize( m_gap );
m_gateways.push_back( PNS_DP_GATEWAY( p0_p - dir, p0_p - dir + dir.Perpendicular(), diagColl ) );
m_gateways.push_back( PNS_DP_GATEWAY( p0_p - dir, p0_p - dir - dir.Perpendicular(), diagColl ) );
m_gateways.push_back( PNS_DP_GATEWAY( p0_n + dir + dir.Perpendicular(), p0_n + dir, diagColl ) );
m_gateways.push_back( PNS_DP_GATEWAY( p0_n + dir - dir.Perpendicular(), p0_n + dir, diagColl ) );
}
}
}
for( int i = 0; i < 2; i++ )
{
for( int j = 0; j < 2; j++ )
{
OPT_VECTOR2I ips[2];
ips[0] = d_n[i].IntersectLines( d_p[j] );
ips[1] = st_p[i].IntersectLines( st_n[j] );
if( d_n[i].Collinear( d_p[j] ) )
ips[0] = boost::none;
if( st_p[i].Collinear( st_p[j] ) )
ips[1] = boost::none;
// diagonal-diagonal and straight-straight cases - the most typical case if the pads
// are on the same straight/diagonal line
for( int k = 0; k < 2; k++ )
{
if( ips[k] )
{
const VECTOR2I m( *ips[k] );
if( m != p0_p && m != p0_n )
{
int prio = ( padDist > padToGapThreshold * m_gap ? 10 : 20 );
VECTOR2I g_p( ( p0_p - m ).Resize( (double) m_gap * M_SQRT1_2 ) );
VECTOR2I g_n( ( p0_n - m ).Resize( (double) m_gap * M_SQRT1_2 ) );
m_gateways.push_back( PNS_DP_GATEWAY( m + g_p, m + g_n, k == 0 ? true : false, DIRECTION_45::ANG_OBTUSE, prio ) );
}
}
}
ips[0] = st_n[i].IntersectLines( d_p[j] );
ips[1] = st_p[i].IntersectLines( d_n[j] );
// diagonal-straight cases: 8 possibilities of "weirder" exists
for( int k = 0; k < 2; k++ )
{
if( ips[k] )
{
const VECTOR2I m( *ips[k] );
if( !aViaMode && m != p0_p && m != p0_n )
{
VECTOR2I g_p, g_n;
g_p = ( p0_p - m ).Resize( (double) m_gap * M_SQRT2 );
g_n = ( p0_n - m ).Resize( (double) m_gap );
if( angle( g_p, g_n ) != DIRECTION_45::ANG_ACUTE )
m_gateways.push_back( PNS_DP_GATEWAY( m + g_p, m + g_n, true ) );
g_p = ( p0_p - m ).Resize( m_gap );
g_n = ( p0_n - m ).Resize( (double) m_gap * M_SQRT2 );
if( angle( g_p, g_n ) != DIRECTION_45::ANG_ACUTE )
m_gateways.push_back( PNS_DP_GATEWAY( m + g_p, m + g_n, true ) );
}
}
}
}
}
if( aBuildEntries )
buildEntries( p0_p, p0_n );
}
PNS_DP_PRIMITIVE_PAIR PNS_DIFF_PAIR::EndingPrimitives()
{
if( m_hasVias )
return PNS_DP_PRIMITIVE_PAIR( &m_via_p, &m_via_n );
else
{
const PNS_LINE lP( PLine() );
const PNS_LINE lN( NLine() );
PNS_SEGMENT sP( lP, lP.CSegment( -1 ) );
PNS_SEGMENT sN( lN, lN.CSegment( -1 ) );
PNS_DP_PRIMITIVE_PAIR dpair( &sP, &sN );
dpair.SetAnchors( sP.Seg().B, sN.Seg().B );
return dpair;
}
}
bool commonParallelProjection( SEG n, SEG p, SEG &pClip, SEG& nClip )
{
SEG n_proj_p( p.LineProject( n.A ), p.LineProject( n.B ) );
int64_t t_a = 0;
int64_t t_b = p.TCoef( p.B );
int64_t tproj_a = p.TCoef( n_proj_p.A );
int64_t tproj_b = p.TCoef( n_proj_p.B );
if( t_b < t_a )
std::swap( t_b, t_a );
if( tproj_b < tproj_a )
std::swap( tproj_b, tproj_a );
if( t_b <= tproj_a )
return false;
if( t_a >= tproj_b )
return false;
int64_t t[4] = { 0, p.TCoef( p.B ), p.TCoef( n_proj_p.A ), p.TCoef( n_proj_p.B ) };
std::vector<int64_t> tv( t, t + 4 );
std::sort( tv.begin(), tv.end() ); // fixme: awful and disgusting way of finding 2 midpoints
int64_t pLenSq = p.SquaredLength();
VECTOR2I dp = p.B - p.A;
pClip.A.x = p.A.x + rescale( (int64_t)dp.x, tv[1], pLenSq );
pClip.A.y = p.A.y + rescale( (int64_t)dp.y, tv[1], pLenSq );
pClip.B.x = p.A.x + rescale( (int64_t)dp.x, tv[2], pLenSq );
pClip.B.y = p.A.y + rescale( (int64_t)dp.y, tv[2], pLenSq );
nClip.A = n.LineProject( pClip.A );
nClip.B = n.LineProject( pClip.B );
return true;
}
double PNS_DIFF_PAIR::Skew() const
{
return m_p.Length() - m_n.Length();
}
void PNS_DIFF_PAIR::CoupledSegmentPairs( COUPLED_SEGMENTS_VEC& aPairs ) const
{
SHAPE_LINE_CHAIN p( m_p );
SHAPE_LINE_CHAIN n( m_n );
p.Simplify();
n.Simplify();
for( int i = 0; i < p.SegmentCount(); i++ )
{
for( int j = 0; j < n.SegmentCount(); j++ )
{
SEG sp = p.CSegment( i );
SEG sn = n.CSegment( j );
SEG p_clip, n_clip;
int64_t dist = std::abs( sp.Distance( sn ) - m_width );
if( sp.ApproxParallel( sn ) && m_gapConstraint.Matches( dist ) && commonParallelProjection( sp, sn, p_clip, n_clip ) )
{
const COUPLED_SEGMENTS spair( p_clip, sp, i, n_clip, sn, j );
aPairs.push_back( spair );
}
}
}
}
int64_t PNS_DIFF_PAIR::CoupledLength( const SHAPE_LINE_CHAIN& aP, const SHAPE_LINE_CHAIN& aN ) const
{
int64_t total = 0;
for( int i = 0; i < aP.SegmentCount(); i++ )
{
for( int j = 0; j < aN.SegmentCount(); j++ )
{
SEG sp = aP.CSegment( i );
SEG sn = aN.CSegment( j );
SEG p_clip, n_clip;
int64_t dist = std::abs( sp.Distance(sn) - m_width );
if( sp.ApproxParallel( sn ) && m_gapConstraint.Matches( dist ) &&
commonParallelProjection( sp, sn, p_clip, n_clip ) )
total += p_clip.Length();
}
}
return total;
}
double PNS_DIFF_PAIR::CoupledLength() const
{
COUPLED_SEGMENTS_VEC pairs;
CoupledSegmentPairs( pairs );
double l = 0.0;
for( unsigned int i = 0; i < pairs.size(); i++ )
l += pairs[i].coupledP.Length();
return l;
}
double PNS_DIFF_PAIR::CoupledLengthFactor() const
{
double t = TotalLength();
if( t == 0.0 )
return 0.0;
return CoupledLength() / t;
}
double PNS_DIFF_PAIR::TotalLength() const
{
double lenP = m_p.Length();
double lenN = m_n.Length();
return (lenN + lenP ) / 2.0;
}
int PNS_DIFF_PAIR::CoupledLength ( const SEG& aP, const SEG& aN ) const
{
SEG p_clip, n_clip;
int64_t dist = std::abs( aP.Distance( aN ) - m_width );
if( aP.ApproxParallel( aN ) && m_gapConstraint.Matches( dist ) &&
commonParallelProjection ( aP, aN, p_clip, n_clip ) )
return p_clip.Length();
return 0;
}
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