kicad/pcbnew/router/pns_mouse_trail_tracer.cpp

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/*
* KiRouter - a push-and-(sometimes-)shove PCB router
*
* Copyright (C) 2013-2020 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 "pns_mouse_trail_tracer.h"
#include "pns_router.h"
#include "pns_debug_decorator.h"
namespace PNS {
MOUSE_TRAIL_TRACER::MOUSE_TRAIL_TRACER()
{
m_tolerance = 0;
m_disableMouse = false;
Clear();
}
MOUSE_TRAIL_TRACER::~MOUSE_TRAIL_TRACER() {}
void MOUSE_TRAIL_TRACER::Clear()
{
m_forced = false;
m_manuallyForced = false;
m_trail.Clear();
}
void MOUSE_TRAIL_TRACER::AddTrailPoint( const VECTOR2I& aP )
{
if( m_trail.SegmentCount() == 0 )
{
m_trail.Append( aP );
}
else
{
SEG s_new( m_trail.CPoint( -1 ), aP );
if( m_trail.SegmentCount() > 2 )
{
SEG::ecoord limit = ( static_cast<SEG::ecoord>( m_tolerance ) * m_tolerance );
for( int i = 0; i < m_trail.SegmentCount() - 2; i++ )
{
const SEG& s_trail = m_trail.CSegment( i );
if( s_trail.SquaredDistance( s_new ) <= limit )
{
m_trail = m_trail.Slice( 0, i );
break;
}
}
}
m_trail.Append( aP );
}
m_trail.Simplify();
DEBUG_DECORATOR *dbg = ROUTER::GetInstance()->GetInterface()->GetDebugDecorator();
PNS_DBG( dbg, AddLine, m_trail, CYAN, 50000, "mt-trail" );
}
DIRECTION_45 MOUSE_TRAIL_TRACER::GetPosture( const VECTOR2I& aP )
{
// Tuning factor for how good the "fit" of the trail must be to the posture
const double areaRatioThreshold = 1.3;
// Tuning factor to minimize flutter
const double areaRatioEpsilon = 0.25;
// Minimum distance factor of the trail before the min area test is used to lock the solver
const double minAreaCutoffDistanceFactor = 6;
// Adjusts how far away from p0 we get before whatever posture we solved is locked in
const int lockDistanceFactor = 25;
// Adjusts how close to p0 we unlock the posture again if one was locked already
const int unlockDistanceFactor = 4;
if( m_trail.PointCount() < 2 || m_manuallyForced )
{
// If mouse trail detection is enabled; using the last seg direction as a starting point
// will give the best results. Otherwise, just assume that we switch postures every
// segment.
if( !m_manuallyForced && m_lastSegDirection != DIRECTION_45::UNDEFINED )
m_direction = m_disableMouse ? m_lastSegDirection.Right() : m_lastSegDirection;
return m_direction;
}
DEBUG_DECORATOR* dbg = ROUTER::GetInstance()->GetInterface()->GetDebugDecorator();
VECTOR2I p0 = m_trail.CPoint( 0 );
double refLength = SEG( p0, aP ).Length();
SHAPE_LINE_CHAIN straight( DIRECTION_45().BuildInitialTrace( p0, aP, false ) );
straight.SetClosed( true );
straight.Append( m_trail.Reverse() );
straight.Simplify();
PNS_DBG( dbg, AddLine, straight, m_forced ? BLUE : GREEN, 100000, "mt-straight" );
double areaS = straight.Area();
SHAPE_LINE_CHAIN diag( DIRECTION_45().BuildInitialTrace( p0, aP, true ) );
diag.Append( m_trail.Reverse() );
diag.SetClosed( true );
diag.Simplify();
PNS_DBG( dbg, AddLine, diag, YELLOW, 100000, "mt-diag" );
double areaDiag = diag.Area();
double ratio = areaS / ( areaDiag + 1.0 );
// heuristic to detect that the user dragged back the cursor to the beginning of the trace
// in this case, we cancel any forced posture and restart the trail
if( m_forced && refLength < unlockDistanceFactor * m_tolerance )
{
PNS_DBG( dbg, Message, "Posture: Unlocked and reset" );
m_forced = false;
VECTOR2I start = p0;
m_trail.Clear();
m_trail.Append( start );
}
bool areaOk = false;
// Check the actual trail area against the cutoff. This prevents flutter when the trail is
// very close to a straight line.
if( !m_forced && refLength > minAreaCutoffDistanceFactor * m_tolerance )
{
double areaCutoff = m_tolerance * refLength;
SHAPE_LINE_CHAIN trail( m_trail );
trail.SetClosed( true );
if( trail.Area() > areaCutoff )
areaOk = true;
}
DIRECTION_45 straightDirection;
DIRECTION_45 diagDirection;
DIRECTION_45 newDirection = m_direction;
straightDirection = DIRECTION_45( straight.CSegment( 0 ) );
diagDirection = DIRECTION_45( diag.CSegment( 0 ) );
if( !m_forced && areaOk && ratio > areaRatioThreshold + areaRatioEpsilon )
newDirection = diagDirection;
else if( !m_forced && areaOk && ratio < ( 1.0 / areaRatioThreshold ) - areaRatioEpsilon )
newDirection = straightDirection;
else
newDirection = m_direction.IsDiagonal() ? diagDirection : straightDirection;
if( !m_disableMouse && newDirection != m_direction )
{
PNS_DBG( dbg, Message, wxString::Format( "Posture: direction update %s => %s",
m_direction.Format(), newDirection.Format() ) );
m_direction = newDirection;
}
// If we have a last segment, correct the direction relative to it. For segment exit, we want
// to correct to the least obtuse
if( !m_manuallyForced && !m_disableMouse && m_lastSegDirection != DIRECTION_45::UNDEFINED )
{
PNS_DBG( dbg, Message,
wxString::Format( "Posture: checking direction %s against last seg %s",
m_direction.Format(), m_lastSegDirection.Format() ) );
if( straightDirection == m_lastSegDirection )
{
if( m_direction != straightDirection )
{
PNS_DBG( dbg, Message, wxString::Format( "Posture: forcing straight => %s",
straightDirection.Format() ) );
}
m_direction = straightDirection;
}
else if( diagDirection == m_lastSegDirection )
{
if( m_direction != diagDirection )
{
PNS_DBG( dbg, Message, wxString::Format( "Posture: forcing diagonal => %s",
diagDirection.Format() ) );
}
m_direction = diagDirection;
}
else
{
switch( m_direction.Angle( m_lastSegDirection ) )
{
case DIRECTION_45::ANG_HALF_FULL:
// Force a better (acute) connection
m_direction = m_direction.IsDiagonal() ? straightDirection : diagDirection;
PNS_DBG( dbg, Message, wxString::Format( "Posture: correcting half full => %s",
m_direction.Format() ) );
break;
case DIRECTION_45::ANG_ACUTE:
{
// Force a better connection by flipping if possible
DIRECTION_45 candidate = m_direction.IsDiagonal() ? straightDirection
: diagDirection;
if( candidate.Angle( m_lastSegDirection ) == DIRECTION_45::ANG_RIGHT )
{
PNS_DBG( dbg, Message, wxString::Format( "Posture: correcting right => %s",
candidate.Format() ) );
m_direction = candidate;
}
break;
}
case DIRECTION_45::ANG_RIGHT:
{
// Force a better connection by flipping if possible
DIRECTION_45 candidate = m_direction.IsDiagonal() ? straightDirection
: diagDirection;
if( candidate.Angle( m_lastSegDirection ) == DIRECTION_45::ANG_OBTUSE )
{
PNS_DBG( dbg, Message, wxString::Format( "Posture: correcting obtuse => %s",
candidate.Format() ) );
m_direction = candidate;
}
break;
}
default:
break;
}
}
}
// If we get far away from the initial point, lock in the current solution to prevent flutter
if( !m_forced && refLength > lockDistanceFactor * m_tolerance )
{
PNS_DBG( dbg, Message, "Posture: solution locked" );
m_forced = true;
}
return m_direction;
}
void MOUSE_TRAIL_TRACER::FlipPosture()
{
m_direction = m_direction.Right();
m_forced = true;
m_manuallyForced = true;
}
VECTOR2I MOUSE_TRAIL_TRACER::GetTrailLeadVector() const
{
if( m_trail.PointCount() < 2 )
{
return VECTOR2I(0, 0);
}
else
{
return m_trail.CPoint( -1 ) - m_trail.CPoint( 0 );
}
}
}