kicad/pcbnew/ratsnest_data.cpp

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/*
* This program source code file is part of KICAD, a free EDA CAD application.
*
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* Copyright (C) 2013-2017 CERN
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* @author Maciej Suminski <maciej.suminski@cern.ch>
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* @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 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 ratsnest_data.cpp
* @brief Class that computes missing connections on a PCB.
*/
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#ifdef PROFILE
#include <profile.h>
#endif
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#include <ratsnest_data.h>
#include <functional>
using namespace std::placeholders;
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#include <cassert>
#include <algorithm>
#include <limits>
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#include <connectivity_algo.h>
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static uint64_t getDistance( const CN_ANCHOR_PTR& aNode1, const CN_ANCHOR_PTR& aNode2 )
{
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double dx = ( aNode1->Pos().x - aNode2->Pos().x );
double dy = ( aNode1->Pos().y - aNode2->Pos().y );
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return sqrt( dx * dx + dy * dy );
}
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static bool sortWeight( const CN_EDGE& aEdge1, const CN_EDGE& aEdge2 )
{
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return aEdge1.GetWeight() < aEdge2.GetWeight();
}
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static const std::vector<CN_EDGE> kruskalMST( std::list<CN_EDGE>& aEdges,
std::vector<CN_ANCHOR_PTR>& aNodes )
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{
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unsigned int nodeNumber = aNodes.size();
unsigned int mstExpectedSize = nodeNumber - 1;
unsigned int mstSize = 0;
bool ratsnestLines = false;
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// The output
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std::vector<CN_EDGE> mst;
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// Set tags for marking cycles
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std::unordered_map<CN_ANCHOR_PTR, int> tags;
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unsigned int tag = 0;
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for( auto& node : aNodes )
{
node->SetTag( tag );
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tags[node] = tag++;
}
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// Lists of nodes connected together (subtrees) to detect cycles in the graph
std::vector<std::list<int> > cycles( nodeNumber );
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for( unsigned int i = 0; i < nodeNumber; ++i )
cycles[i].push_back( i );
// Kruskal algorithm requires edges to be sorted by their weight
aEdges.sort( sortWeight );
while( mstSize < mstExpectedSize && !aEdges.empty() )
{
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//printf("mstSize %d %d\n", mstSize, mstExpectedSize);
auto& dt = aEdges.front();
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int srcTag = tags[dt.GetSourceNode()];
int trgTag = tags[dt.GetTargetNode()];
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// Check if by adding this edge we are going to join two different forests
if( srcTag != trgTag )
{
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// Because edges are sorted by their weight, first we always process connected
// items (weight == 0). Once we stumble upon an edge with non-zero weight,
// it means that the rest of the lines are ratsnest.
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if( !ratsnestLines && dt.GetWeight() != 0 )
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ratsnestLines = true;
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// Update tags
if( ratsnestLines )
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{
for( auto it = cycles[trgTag].begin(); it != cycles[trgTag].end(); ++it )
{
tags[aNodes[*it]] = srcTag;
}
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// Do a copy of edge, but make it RN_EDGE_MST. In contrary to RN_EDGE,
// RN_EDGE_MST saves both source and target node and does not require any other
// edges to exist for getting source/target nodes
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CN_EDGE newEdge ( dt.GetSourceNode(), dt.GetTargetNode(), dt.GetWeight() );
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assert( newEdge.GetSourceNode()->GetTag() != newEdge.GetTargetNode()->GetTag() );
assert( newEdge.GetWeight() > 0 );
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mst.push_back( newEdge );
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++mstSize;
}
else
{
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// for( it = cycles[trgTag].begin(), itEnd = cycles[trgTag].end(); it != itEnd; ++it )
// for( auto it : cycles[trgTag] )
for( auto it = cycles[trgTag].begin(); it != cycles[trgTag].end(); ++it )
{
tags[aNodes[*it]] = srcTag;
aNodes[*it]->SetTag( srcTag );
}
// Processing a connection, decrease the expected size of the ratsnest MST
--mstExpectedSize;
}
// Move nodes that were marked with old tag to the list marked with the new tag
cycles[srcTag].splice( cycles[srcTag].end(), cycles[trgTag] );
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}
// Remove the edge that was just processed
aEdges.erase( aEdges.begin() );
}
// Probably we have discarded some of edges, so reduce the size
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mst.resize( mstSize );
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return mst;
}
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class RN_NET::TRIANGULATOR_STATE
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{
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private:
std::vector<CN_ANCHOR_PTR> m_allNodes;
std::list<hed::EDGE_PTR> hedTriangulation( std::vector<hed::NODE_PTR>& aNodes )
{
hed::TRIANGULATION triangulator;
triangulator.CreateDelaunay( aNodes.begin(), aNodes.end() );
std::list<hed::EDGE_PTR> edges;
triangulator.GetEdges( edges );
return edges;
}
// Checks if all nodes in aNodes lie on a single line. Requires the nodes to
// have unique coordinates!
bool areNodesColinear( const std::vector<hed::NODE_PTR>& aNodes ) const
{
if ( aNodes.size() <= 2 )
return true;
const auto p0 = aNodes[0]->Pos();
const auto v0 = aNodes[1]->Pos() - p0;
for( unsigned i = 2; i < aNodes.size(); i++ )
{
const auto v1 = aNodes[i]->Pos() - p0;
if( v0.Cross( v1 ) != 0 )
{
return false;
}
}
return true;
}
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public:
void Clear()
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{
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m_allNodes.clear();
}
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void AddNode( CN_ANCHOR_PTR aNode )
{
m_allNodes.push_back( aNode );
}
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const std::list<CN_EDGE> Triangulate()
{
std::list<CN_EDGE> mstEdges;
std::list<hed::EDGE_PTR> triangEdges;
std::vector<hed::NODE_PTR> triNodes;
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using ANCHOR_LIST = std::vector<CN_ANCHOR_PTR>;
std::vector<ANCHOR_LIST> anchorChains;
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triNodes.reserve( m_allNodes.size() );
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anchorChains.reserve( m_allNodes.size() );
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std::sort( m_allNodes.begin(), m_allNodes.end(),
[] ( const CN_ANCHOR_PTR& aNode1, const CN_ANCHOR_PTR& aNode2 )
{
if( aNode1->Pos().y < aNode2->Pos().y )
return true;
else if( aNode1->Pos().y == aNode2->Pos().y )
{
return aNode1->Pos().x < aNode2->Pos().x;
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}
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return false;
}
);
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CN_ANCHOR_PTR prev, last;
int id = 0;
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for( auto n : m_allNodes )
{
anchorChains.push_back( ANCHOR_LIST() );
}
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for( auto n : m_allNodes )
{
if( !prev || prev->Pos() != n->Pos() )
{
auto tn = std::make_shared<hed::NODE> ( n->Pos().x, n->Pos().y );
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tn->SetId( id );
triNodes.push_back( tn );
}
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id++;
prev = n;
}
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int prevId = 0;
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for( auto n : triNodes )
{
for( int i = prevId; i < n->Id(); i++ )
anchorChains[prevId].push_back( m_allNodes[ i ] );
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prevId = n->Id();
}
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for( int i = prevId; i < id; i++ )
anchorChains[prevId].push_back( m_allNodes[ i ] );
if( triNodes.size() == 1 )
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{
return mstEdges;
}
else if( areNodesColinear( triNodes ) )
{
// special case: all nodes are on the same line - there's no
// triangulation for such set. In this case, we sort along any coordinate
// and chain the nodes together.
for(int i = 0; i < (int)triNodes.size() - 1; i++ )
{
auto src = m_allNodes[ triNodes[i]->Id() ];
auto dst = m_allNodes[ triNodes[i + 1]->Id() ];
mstEdges.emplace_back( src, dst, getDistance( src, dst ) );
}
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}
else
{
hed::TRIANGULATION triangulator;
triangulator.CreateDelaunay( triNodes.begin(), triNodes.end() );
triangulator.GetEdges( triangEdges );
for( auto e : triangEdges )
{
auto src = m_allNodes[ e->GetSourceNode()->Id() ];
auto dst = m_allNodes[ e->GetTargetNode()->Id() ];
mstEdges.emplace_back( src, dst, getDistance( src, dst ) );
}
}
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for( unsigned int i = 0; i < anchorChains.size(); i++ )
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{
auto& chain = anchorChains[i];
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if( chain.size() < 2 )
continue;
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std::sort( chain.begin(), chain.end(),
[] ( const CN_ANCHOR_PTR& a, const CN_ANCHOR_PTR& b ) {
return a->GetCluster().get() < b->GetCluster().get();
} );
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for( unsigned int j = 1; j < chain.size(); j++ )
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{
const auto& prevNode = chain[j - 1];
const auto& curNode = chain[j];
int weight = prevNode->GetCluster() != curNode->GetCluster() ? 1 : 0;
mstEdges.push_back( CN_EDGE ( prevNode, curNode, weight ) );
}
}
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return mstEdges;
}
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};
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RN_NET::RN_NET() : m_dirty( true )
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{
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m_triangulator.reset( new TRIANGULATOR_STATE );
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}
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void RN_NET::compute()
{
// Special cases do not need complicated algorithms (actually, it does not work well with
// the Delaunay triangulator)
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if( m_nodes.size() <= 2 )
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{
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m_rnEdges.clear();
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// Check if the only possible connection exists
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if( m_boardEdges.size() == 0 && m_nodes.size() == 2 )
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{
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auto last = ++m_nodes.begin();
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// There can be only one possible connection, but it is missing
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CN_EDGE edge (*m_nodes.begin(), *last );
edge.GetSourceNode()->SetTag( 0 );
edge.GetTargetNode()->SetTag( 1 );
m_rnEdges.push_back( edge );
}
else
{
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// Set tags to m_nodes as connected
for( auto node : m_nodes )
node->SetTag( 0 );
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}
return;
}
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m_triangulator->Clear();
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for( auto n : m_nodes )
{
m_triangulator->AddNode( n );
}
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#ifdef PROFILE
PROF_COUNTER cnt("triangulate");
#endif
auto triangEdges = m_triangulator->Triangulate();
#ifdef PROFILE
cnt.Show();
#endif
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for( const auto& e : m_boardEdges )
triangEdges.push_back( e );
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// Get the minimal spanning tree
#ifdef PROFILE
PROF_COUNTER cnt2("mst");
#endif
m_rnEdges = kruskalMST( triangEdges, m_nodes );
#ifdef PROFILE
cnt2.Show();
#endif
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}
void RN_NET::Update()
{
compute();
m_dirty = false;
}
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void RN_NET::Clear()
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{
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m_rnEdges.clear();
m_boardEdges.clear();
m_nodes.clear();
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m_dirty = true;
}
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void RN_NET::AddCluster( CN_CLUSTER_PTR aCluster )
{
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CN_ANCHOR_PTR firstAnchor;
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for( auto item : *aCluster )
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{
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bool isZone = dynamic_cast<CN_ZONE*>(item) != nullptr;
auto& anchors = item->Anchors();
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unsigned int nAnchors = isZone ? 1 : anchors.size();
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if( nAnchors > anchors.size() )
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nAnchors = anchors.size();
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for( unsigned int i = 0; i < nAnchors; i++ )
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{
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anchors[i]->SetCluster( aCluster );
m_nodes.push_back(anchors[i]);
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if( firstAnchor )
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{
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if( firstAnchor != anchors[i] )
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{
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m_boardEdges.emplace_back( firstAnchor, anchors[i], 0 );
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}
}
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else
{
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firstAnchor = anchors[i];
}
}
}
}
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bool RN_NET::NearestBicoloredPair( const RN_NET& aOtherNet, CN_ANCHOR_PTR& aNode1,
CN_ANCHOR_PTR& aNode2 ) const
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{
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bool rv = false;
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VECTOR2I::extended_type distMax = VECTOR2I::ECOORD_MAX;
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for( auto nodeA : m_nodes )
{
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for( auto nodeB : aOtherNet.m_nodes )
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{
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if( !nodeA->GetNoLine() )
{
auto squaredDist = (nodeA->Pos() - nodeB->Pos() ).SquaredEuclideanNorm();
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if( squaredDist < distMax )
{
rv = true;
distMax = squaredDist;
aNode1 = nodeA;
aNode2 = nodeB;
}
}
}
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}
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return rv;
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}
void RN_NET::SetVisible( bool aEnabled )
{
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for( auto& edge : m_rnEdges )
edge.SetVisible( aEnabled );
}