pns_joint.h

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/*
 * KiRouter - a push-and-(sometimes-)shove PCB router
 *
 * Copyright (C) 2013-2014 CERN
 * Copyright The KiCad Developers, see AUTHORS.txt for contributors.
 *
 * @author Tomasz Wlostowski <[email protected]>
 *
 * 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 <https://www.gnu.org/licenses/>.
 */
 
#ifndef __PNS_JOINT_H
#define __PNS_JOINT_H
 
#include <vector>
 
#include <math/vector2d.h>
 
#include "pns_item.h"
#include "pns_segment.h"
#include "pns_itemset.h"
 
namespace PNS {

class JOINT : public ITEM
{
public:
    struct HASH_TAG
    {
        VECTOR2I pos;
        NET_HANDLE net;
    };
 
    struct JOINT_TAG_HASH
    {
        std::size_t operator()( const JOINT::HASH_TAG& aP ) const
        {
            using std::size_t;
            using std::hash;
            using std::string;
 
            return ( (hash<int>()( aP.pos.x )
                      ^ (hash<int>()( aP.pos.y ) << 1) ) >> 1 )
                   ^ (hash<void*>()( aP.net ) << 1);
        }
    };
 
    JOINT() :
        ITEM( JOINT_T ), m_tag(), m_locked( false ) {}
 
    JOINT( const VECTOR2I& aPos, const PNS_LAYER_RANGE& aLayers, NET_HANDLE aNet = nullptr ) :
        ITEM( JOINT_T )
    {
        m_tag.pos = aPos;
        m_tag.net = aNet;
        m_layers = aLayers;
        m_locked = false;
    }
 
    JOINT( const JOINT& aB ) :
        ITEM( JOINT_T )
    {
        m_layers = aB.m_layers;
        m_tag.pos = aB.m_tag.pos;
        m_tag.net = aB.m_tag.net;
        m_linkedItems = aB.m_linkedItems;
        m_layers = aB.m_layers;
        m_locked = aB.m_locked;
    }
 
    ITEM* Clone( ) const override
    {
        assert( false );
        return nullptr;
    }

    bool IsLineCorner( bool aAllowLockedSegs = false ) const
    {
        if( m_linkedItems.Size() == 2 && m_linkedItems.Count( SEGMENT_T | ARC_T ) == 2 )
        {
            LINKED_ITEM* seg1 = static_cast<LINKED_ITEM*>( m_linkedItems[0] );
            LINKED_ITEM* seg2 = static_cast<LINKED_ITEM*>( m_linkedItems[1] );
 
            if( !aAllowLockedSegs && ( seg1->IsLocked() || seg2->IsLocked() ) )
                return false;
 
            // joints between segments of different widths are not considered trivial.
            return seg1->Width() == seg2->Width();
        }
        else if( m_linkedItems.Size() > 2 && m_linkedItems.Count( SEGMENT_T | ARC_T ) == 2 )
        {
            if( !aAllowLockedSegs )
                return false;
 
            // There will be multiple VVIAs on joints between two locked segments, because we
            // naively add a VVIA to each end of a locked segment.
            const LINKED_ITEM* seg1 = nullptr;
            const LINKED_ITEM* seg2 = nullptr;
 
            for( const ITEM* item : m_linkedItems.CItems() )
            {
                if( item->IsVirtual() )
                    continue;
 
                if( item->Kind() == SEGMENT_T || item->Kind() == ARC_T )
                {
                    if( !seg1 )
                        seg1 = static_cast<const LINKED_ITEM*>( item );
                    else
                        seg2 = static_cast<const LINKED_ITEM*>( item );
                }
                else
                {
                    return false;
                }
            }
 
            if( seg1 && seg2 )
                return seg1->Width() == seg2->Width();
        }
 
        return false;
    }
 
    bool IsNonFanoutVia() const
    {
        int vias = 0;
        int segs = 0;
        int realItems = 0;
 
        for( const ITEM* item : m_linkedItems.CItems() )
        {
            if( item->IsVirtual() )
                continue;
 
            if( item->Kind() == VIA_T )
                vias++;
            else if( item->Kind() == SEGMENT_T || item->Kind() == ARC_T )
                segs++;
 
            realItems++;
        }
 
        return ( realItems == 3 && vias == 1 && segs == 2 );
    }
 
    bool IsStitchingVia() const
    {
        return ( m_linkedItems.Size() == 1 && m_linkedItems.Count( VIA_T ) == 1 );
    }
 
    bool IsTrivialEndpoint() const
    {
        // fixme: Arcs & trivial endpoint vias
        return m_linkedItems.Size() == 1 && m_linkedItems.Count( SEGMENT_T ) == 1;
    }
 
    bool IsTraceWidthChange() const
    {
        if( m_linkedItems.Count( SEGMENT_T ) != 2 )
            return false;
 
        const LINKED_ITEM* seg1 = nullptr;
        const LINKED_ITEM* seg2 = nullptr;
 
        for( const ITEM* item : m_linkedItems.CItems() )
        {
            if( item->IsVirtual() )
                continue;
 
            if( item->Kind() == VIA_T )
            {
                return false;
            }
            else if( item->Kind() == SEGMENT_T || item->Kind() == ARC_T )
            {
                if( !seg1 )
                    seg1 = static_cast<const LINKED_ITEM*>( item );
                else
                    seg2 = static_cast<const LINKED_ITEM*>( item );
            }
        }
 
        wxCHECK( seg1 && seg2, false );
 
        return seg1->Width() != seg2->Width();
    }

    void Link( ITEM* aItem )
    {
        if( m_linkedItems.Contains( aItem ) )
            return;
 
        m_linkedItems.Add( aItem );
    }

    bool Unlink( ITEM* aItem )
    {
        m_linkedItems.Erase( aItem );
 
        if( m_linkedItems.Size() == 0 )
            m_layers = PNS_LAYER_RANGE( -1 );
 
        return m_linkedItems.Size() == 0;
    }

    LINKED_ITEM* NextSegment( LINKED_ITEM* aCurrent, bool aAllowLockedSegs = false ) const
    {
        const std::vector<ITEM*>& citems = m_linkedItems.CItems();
        const size_t              size = citems.size();
 
        LINKED_ITEM* otherItem = nullptr;
 
        for( size_t i = 0; i < size; i++ )
        {
            ITEM* item = m_linkedItems[i];
 
            if( item != aCurrent )
            {
                if ( item->OfKind( ITEM::SEGMENT_T | ITEM::ARC_T ) )
                {
                    if ( item->Net() == aCurrent->Net() && item->Layers().Overlaps( aCurrent->Layers() ) )
                    {
                        if( otherItem )
                            return nullptr;
 
                        if( !item->IsLocked() || aAllowLockedSegs )
                            otherItem = static_cast<LINKED_ITEM*>( item );
                    }
                }
                else if ( item->OfKind( ITEM::SOLID_T | ITEM::VIA_T ) )
                {
                    if( item->Kind() == ITEM::VIA_T && item->IsVirtual() && aAllowLockedSegs )
                    {
                        // Virtual via will be added at the joint between an unlocked and locked seg
                        continue;
                    }
 
                    return nullptr;
                }
            }
        }
 
        return otherItem;
    }
 
    VIA* Via() const
    {
        for( ITEM* item : m_linkedItems.CItems() )
        {
            if( item->OfKind( VIA_T ) )
                return static_cast<VIA*>( item ); // fixme: const correctness
        }
 
        return nullptr;
    }

    const HASH_TAG& Tag() const
    {
        return m_tag;
    }
 
    const VECTOR2I& Pos() const
    {
        return m_tag.pos;
    }
 
    NET_HANDLE Net() const override
    {
        return m_tag.net;
    }
 
    const std::vector<ITEM*>& LinkList() const
    {
        return m_linkedItems.CItems();
    }
 
    const ITEM_SET& CLinks() const
    {
        return m_linkedItems;
    }
 
    ITEM_SET& Links()
    {
        return m_linkedItems;
    }
 
    int LinkCount( int aMask = -1 ) const
    {
        return m_linkedItems.Count( aMask );
    }
 
    void Dump() const;
 
    bool operator==( const JOINT& rhs )  const
    {
        return m_tag.pos == rhs.m_tag.pos && m_tag.net == rhs.m_tag.net;
    }
 
    void Merge( const JOINT& aJoint )
    {
        if( !Overlaps( aJoint ) )
            return;
 
        m_layers.Merge( aJoint.m_layers );
 
        if( aJoint.IsLocked() )
            m_locked = true;
 
        for( ITEM* item : aJoint.LinkList() )
        {
            m_linkedItems.Add( item );
        }
    }
 
    bool Overlaps( const JOINT& rhs ) const
    {
        return m_tag.pos == rhs.m_tag.pos &&
            m_tag.net == rhs.m_tag.net && m_layers.Overlaps( rhs.m_layers );
    }
 
    void Lock( bool aLock = true )
    {
        m_locked = aLock;
    }
 
    bool IsLocked() const
    {
        return m_locked;
    }
 
private:
    HASH_TAG m_tag;

    ITEM_SET m_linkedItems;

    bool m_locked;
};
 
inline bool operator==( JOINT::HASH_TAG const& aP1, JOINT::HASH_TAG const& aP2 )
{
    return aP1.pos == aP2.pos && aP1.net == aP2.net;
}
 
}
 
#endif    // __PNS_JOINT_H