drc_rtree.h

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/*
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2020-2021 KiCad Developers, see AUTHORS.txt for contributors.
 * Copyright (C) 2020 CERN
 *
 * 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, you may find one here:
 * http://www.gnu.org/licenses/old-licenses/gpl-3.0.html
 * or you may search the http://www.gnu.org website for the version 3 license,
 * or you may write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
 */

#ifndef DRC_RTREE_H_
#define DRC_RTREE_H_

#include <eda_rect.h>
#include <board_item.h>
#include <pad.h>
#include <fp_text.h>
#include <memory>
#include <unordered_set>
#include <set>
#include <vector>

#include <geometry/rtree.h>
#include <geometry/shape.h>
#include <geometry/shape_segment.h>
#include <math/vector2d.h>

class DRC_RTREE
{

public:

 struct ITEM_WITH_SHAPE
 {
 ITEM_WITH_SHAPE( BOARD_ITEM *aParent, SHAPE* aShape,
 std::shared_ptr<SHAPE> aParentShape = nullptr ) :
 parent ( aParent ),
 shape ( aShape ),
 parentShape( aParentShape )
 {};

 BOARD_ITEM* parent;
 SHAPE* shape;
 std::shared_ptr<SHAPE> parentShape;
 };

private:

 using drc_rtree = RTree<ITEM_WITH_SHAPE*, int, 2, double>;

public:

 DRC_RTREE()
 {
 for( int layer : LSET::AllLayersMask().Seq() )
 m_tree[layer] = new drc_rtree();

 m_count = 0;
 }

 ~DRC_RTREE()
 {
 for( auto tree : m_tree )
 {
 for( auto el : *tree )
 delete el;

 delete tree;
 }
 }

 void Insert( BOARD_ITEM* aItem, PCB_LAYER_ID aLayer, int aWorstClearance = 0 )
 {
 wxCHECK( aLayer != UNDEFINED_LAYER, /* void */ );

 if( aItem->Type() == PCB_FP_TEXT_T && !static_cast<FP_TEXT*>( aItem )->IsVisible() )
 return;

 std::vector<SHAPE*> subshapes;
 std::shared_ptr<SHAPE> shape = aItem->GetEffectiveShape( ToLAYER_ID( aLayer ) );
 subshapes.clear();

 if( shape->HasIndexableSubshapes() )
 shape->GetIndexableSubshapes( subshapes );
 else
 subshapes.push_back( shape.get() );

 if( aItem->Type() == PCB_PAD_T )
 {
 PAD* pad = static_cast<PAD*>( aItem );

 if( pad->GetDrillSizeX() )
 {
 const SHAPE* hole = pad->GetEffectiveHoleShape();
 subshapes.push_back( const_cast<SHAPE*>( hole ) );
 }
 }

 for( SHAPE* subshape : subshapes )
 {
 BOX2I bbox = subshape->BBox();

 bbox.Inflate( aWorstClearance );

 const int mmin[2] = { bbox.GetX(), bbox.GetY() };
 const int mmax[2] = { bbox.GetRight(), bbox.GetBottom() };
 ITEM_WITH_SHAPE* itemShape = new ITEM_WITH_SHAPE( aItem, subshape, shape );

 m_tree[aLayer]->Insert( mmin, mmax, itemShape );
 m_count++;
 }
 }

 void clear()
 {
 for( auto tree : m_tree )
 tree->RemoveAll();

 m_count = 0;
 }

 bool CheckColliding( SHAPE* aRefShape, PCB_LAYER_ID aTargetLayer, int aClearance = 0,
 std::function<bool( BOARD_ITEM*)> aFilter = nullptr ) const
 {
 BOX2I box = aRefShape->BBox();
 box.Inflate( aClearance );

 int min[2] = { box.GetX(), box.GetY() };
 int max[2] = { box.GetRight(), box.GetBottom() };

 int count = 0;

 auto visit =
 [&] ( ITEM_WITH_SHAPE* aItem ) -> bool
 {
 if( !aFilter || aFilter( aItem->parent ) )
 {
 int actual;

 if( aRefShape->Collide( aItem->shape, aClearance, &actual ) )
 {
 count++;
 return false;
 }
 }

 return true;
 };

 this->m_tree[aTargetLayer]->Search( min, max, visit );
 return count > 0;
 }

 int QueryColliding( BOARD_ITEM* aRefItem,
 PCB_LAYER_ID aRefLayer,
 PCB_LAYER_ID aTargetLayer,
 std::function<bool( BOARD_ITEM* )> aFilter = nullptr,
 std::function<bool( BOARD_ITEM* )> aVisitor = nullptr,
 int aClearance = 0 ) const
 {
 // keep track of BOARD_ITEMs that have been already found to collide (some items
 // might be build of COMPOUND/triangulated shapes and a single subshape collision
 // means we have a hit)
 std::unordered_set<BOARD_ITEM*> collidingCompounds;

 // keep track of results of client filter so we don't ask more than once for compound
 // shapes
 std::map<BOARD_ITEM*, bool> filterResults;

 EDA_RECT box = aRefItem->GetBoundingBox();
 box.Inflate( aClearance );

 int min[2] = { box.GetX(), box.GetY() };
 int max[2] = { box.GetRight(), box.GetBottom() };

 std::shared_ptr<SHAPE> refShape = aRefItem->GetEffectiveShape( aRefLayer );

 int count = 0;

 auto visit =
 [&]( ITEM_WITH_SHAPE* aItem ) -> bool
 {
 if( aItem->parent == aRefItem )
 return true;

 if( collidingCompounds.find( aItem->parent ) != collidingCompounds.end() )
 return true;

 bool filtered;
 auto it = filterResults.find( aItem->parent );

 if( it == filterResults.end() )
 {
 filtered = aFilter && !aFilter( aItem->parent );
 filterResults[ aItem->parent ] = filtered;
 }
 else
 {
 filtered = it->second;
 }

 if( filtered )
 return true;

 if( refShape->Collide( aItem->shape, aClearance ) )
 {
 collidingCompounds.insert( aItem->parent );
 count++;

 if( aVisitor )
 return aVisitor( aItem->parent );
 }

 return true;
 };

 this->m_tree[aTargetLayer]->Search( min, max, visit );
 return count;
 }

 bool QueryColliding( EDA_RECT aBox, SHAPE* aRefShape, PCB_LAYER_ID aLayer, int aClearance,
 int* aActual, VECTOR2I* aPos ) const
 {
 aBox.Inflate( aClearance );

 int min[2] = { aBox.GetX(), aBox.GetY() };
 int max[2] = { aBox.GetRight(), aBox.GetBottom() };

 bool collision = false;
 int actual = INT_MAX;
 VECTOR2I pos;

 auto visit =
 [&]( ITEM_WITH_SHAPE* aItem ) -> bool
 {
 int curActual;
 VECTOR2I curPos;

 if( aRefShape->Collide( aItem->shape, aClearance, &curActual, &curPos ) )
 {
 collision = true;

 if( curActual < actual )
 {
  actual = curActual;
 pos = curPos;
 }

 // Stop looking after we have a true collision
 if( actual <= 0 )
 return false;
 }

 return true;
 };

 this->m_tree[aLayer]->Search( min, max, visit );

 if( collision )
 {
 if( aActual )
 *aActual = std::max( 0, actual );

 if( aPos )
 *aPos = pos;

 return true;
 }

 return false;
 }

 bool QueryColliding( EDA_RECT aBox, SHAPE* aRefShape, PCB_LAYER_ID aLayer ) const
 {
 SHAPE_POLY_SET* poly = dynamic_cast<SHAPE_POLY_SET*>( aRefShape );

 int min[2] = { aBox.GetX(), aBox.GetY() };
 int max[2] = { aBox.GetRight(), aBox.GetBottom() };
 bool collision = false;

 // Special case the polygon case. Otherwise we'll call its Collide() method which will
 // triangulate it as well and then do triangle/triangle collisions. This ends up being
 // slower than 4 calls to PointInside().
 auto polyVisitor =
 [&]( ITEM_WITH_SHAPE* aItem ) -> bool
 {
 SHAPE* shape = aItem->shape;
 wxASSERT( dynamic_cast<SHAPE_POLY_SET::TRIANGULATED_POLYGON::TRI*>( shape ) );
 auto tri = static_cast<SHAPE_POLY_SET::TRIANGULATED_POLYGON::TRI*>( shape );

 const SHAPE_LINE_CHAIN& outline = poly->Outline( 0 );

 if( outline.PointInside( tri->GetPoint( 0 ) )
 || outline.PointInside( tri->GetPoint( 1 ) )
 || outline.PointInside( tri->GetPoint( 2 ) )
 || tri->PointInside( outline.CPoint( 0 ) ) )
 {
 collision = true;
 return false;
 }

 return true;
 };

 auto visitor =
 [&]( ITEM_WITH_SHAPE* aItem ) -> bool
 {
 if( aRefShape->Collide( aItem->shape, 0 ) )
 {
 collision = true;
 return false;
 }

 return true;
 };

 if( poly && poly->OutlineCount() == 1 )
 this->m_tree[aLayer]->Search( min, max, polyVisitor );
 else
 this->m_tree[aLayer]->Search( min, max, visitor );

 return collision;
 }

 typedef std::pair<PCB_LAYER_ID, PCB_LAYER_ID> LAYER_PAIR;

 struct PAIR_INFO
 {
 PAIR_INFO( LAYER_PAIR aPair, ITEM_WITH_SHAPE* aRef, ITEM_WITH_SHAPE* aTest ) :
 layerPair( aPair ),
 refItem( aRef ),
 testItem( aTest )
 { };

 LAYER_PAIR layerPair;
 ITEM_WITH_SHAPE* refItem;
 ITEM_WITH_SHAPE* testItem;
 };

 int QueryCollidingPairs( DRC_RTREE* aRefTree,
 std::vector<LAYER_PAIR> aLayerPairs,
 std::function<bool( const LAYER_PAIR&,
 ITEM_WITH_SHAPE*, ITEM_WITH_SHAPE*,
 bool* aCollision )> aVisitor,
 int aMaxClearance,
 std::function<bool(int, int )> aProgressReporter ) const
 {
 std::vector<PAIR_INFO> pairsToVisit;

 for( LAYER_PAIR& layerPair : aLayerPairs )
 {
 const PCB_LAYER_ID refLayer = layerPair.first;
 const PCB_LAYER_ID targetLayer = layerPair.second;

 for( ITEM_WITH_SHAPE* refItem : aRefTree->OnLayer( refLayer ) )
 {
 BOX2I box = refItem->shape->BBox();
 box.Inflate( aMaxClearance );

 int min[2] = { box.GetX(), box.GetY() };
 int max[2] = { box.GetRight(), box.GetBottom() };

 auto visit =
 [&]( ITEM_WITH_SHAPE* aItemToTest ) -> bool
 {
 // don't collide items against themselves
 if( aItemToTest->parent == refItem->parent )
 return true;

 pairsToVisit.emplace_back( layerPair, refItem, aItemToTest );
 return true;
 };

 this->m_tree[targetLayer]->Search( min, max, visit );
 };
 }

 // keep track of BOARD_ITEMs pairs that have been already found to collide (some items
 // might be build of COMPOUND/triangulated shapes and a single subshape collision
 // means we have a hit)
 std::map< std::pair<BOARD_ITEM*, BOARD_ITEM*>, int> collidingCompounds;

 int progress = 0;
 int count = pairsToVisit.size();

 for( const PAIR_INFO& pair : pairsToVisit )
 {
 if( !aProgressReporter( progress++, count ) )
 break;

 BOARD_ITEM* a = pair.refItem->parent;
 BOARD_ITEM* b = pair.testItem->parent;

 // store canonical order so we don't collide in both directions (a:b and b:a)
 if( static_cast<void*>( a ) > static_cast<void*>( b ) )
 std::swap( a, b );

 // don't report multiple collisions for compound or triangulated shapes
 if( collidingCompounds.count( { a, b } ) )
 continue;

 bool collisionDetected = false;

 if( !aVisitor( pair.layerPair, pair.refItem, pair.testItem, &collisionDetected ) )
 break;

 if( collisionDetected )
 collidingCompounds[ { a, b } ] = 1;
 }

 return 0;
 }

 size_t size() const
 {
 return m_count;
 }

 bool empty() const
 {
 return m_count == 0;
 }

 using iterator = typename drc_rtree::Iterator;

 struct DRC_LAYER
 {
 DRC_LAYER( drc_rtree* aTree ) : layer_tree( aTree )
 {
 m_rect = { { INT_MIN, INT_MIN }, { INT_MAX, INT_MAX } };
 };

 DRC_LAYER( drc_rtree* aTree, const EDA_RECT aRect ) : layer_tree( aTree )
 {
 m_rect = { { aRect.GetX(), aRect.GetY() },
 { aRect.GetRight(), aRect.GetBottom() } };
 };

 drc_rtree::Rect m_rect;
 drc_rtree* layer_tree;

 iterator begin()
 {
 return layer_tree->begin( m_rect );
 }

 iterator end()
 {
 return layer_tree->end( m_rect );
 }
 };

 DRC_LAYER OnLayer( PCB_LAYER_ID aLayer ) const
 {
 return DRC_LAYER( m_tree[int( aLayer )] );
 }

 DRC_LAYER Overlapping( PCB_LAYER_ID aLayer, const wxPoint& aPoint, int aAccuracy = 0 ) const
 {
 EDA_RECT rect( aPoint, wxSize( 0, 0 ) );
 rect.Inflate( aAccuracy );
 return DRC_LAYER( m_tree[int( aLayer )], rect );
 }

 DRC_LAYER Overlapping( PCB_LAYER_ID aLayer, const EDA_RECT& aRect ) const
 {
 return DRC_LAYER( m_tree[int( aLayer )], aRect );
 }


private:
 drc_rtree* m_tree[PCB_LAYER_ID_COUNT];
 size_t m_count;
};


#endif /* DRC_RTREE_H_ */