junction_helpers.cpp

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#include "junction_helpers.h"
 
#include <sch_line.h>
 
using namespace JUNCTION_HELPERS;
 
POINT_INFO JUNCTION_HELPERS::AnalyzePoint( const EE_RTREE& aItems, const VECTOR2I& aPosition,
 bool aBreakCrossings )
{
 enum layers
 {
 WIRES = 0,
 BUSES
 };
 
 POINT_INFO info{};
 info.hasBusEntry = false;
 info.hasExplicitJunctionDot = false;
 info.isJunction = false;
 info.hasBusEntryToMultipleWires = false;
 
 bool breakLines[2] = { false };
 std::unordered_set<int> exitAngles[2];
 std::vector<const SCH_LINE*> midPointLines[2];
 
 // A pin at 90° still shouldn't match a line at 90° so just give pins unique numbers
 int uniqueAngle = 10000;
 
 for( const SCH_ITEM* item : aItems.Overlapping( aPosition ) )
 {
 if( item->GetEditFlags() & STRUCT_DELETED )
 continue;
 
 switch( item->Type() )
 {
 case SCH_JUNCTION_T:
 if( item->HitTest( aPosition, -1 ) )
 info.hasExplicitJunctionDot = true;
 
 break;
 
 case SCH_LINE_T:
 {
 const SCH_LINE* line = static_cast<const SCH_LINE*>( item );
 int layer;
 
 if( line->GetStartPoint() == line->GetEndPoint() )
 break;
 else if( line->GetLayer() == LAYER_WIRE )
 layer = WIRES;
 else if( line->GetLayer() == LAYER_BUS )
 layer = BUSES;
 else
 break;
 
 if( line->IsConnected( aPosition ) )
 {
 breakLines[layer] = true;
 exitAngles[layer].insert( line->GetAngleFrom( aPosition ) );
 }
 else if( line->HitTest( aPosition, -1 ) )
 {
 if( aBreakCrossings )
 breakLines[layer] = true;
 
 // Defer any line midpoints until we know whether or not we're breaking them
 midPointLines[layer].push_back( line );
 }
 }
 break;
 
 case SCH_BUS_WIRE_ENTRY_T:
 if( item->IsConnected( aPosition ) )
 {
 breakLines[BUSES] = true;
 exitAngles[BUSES].insert( uniqueAngle++ );
 breakLines[WIRES] = true;
 exitAngles[WIRES].insert( uniqueAngle++ );
 info.hasBusEntry = true;
 }
 
 break;
 
 case SCH_SYMBOL_T:
 case SCH_SHEET_T:
 if( item->IsConnected( aPosition ) )
 {
 breakLines[WIRES] = true;
 exitAngles[WIRES].insert( uniqueAngle++ );
 }
 
 break;
 
 default: break;
 }
 }
 
 for( int layer : { WIRES, BUSES } )
 {
 if( breakLines[layer] )
 {
 for( const SCH_LINE* line : midPointLines[layer] )
 {
 exitAngles[layer].insert( line->GetAngleFrom( aPosition ) );
 exitAngles[layer].insert( line->GetReverseAngleFrom( aPosition ) );
 }
 }
 }
 
 if( info.hasBusEntry )
 {
 // The bus entry and one wire is 2 wires, and the one entry is exactly one bus
 // Any more wires must be multiple wires, but any more buses means a wire
 // crossing at the bus entry root.
 info.hasBusEntryToMultipleWires =
 exitAngles[WIRES].size() > 2 && exitAngles[BUSES].size() == 1;
 }
 
 // Any three things of the same type is a junction of some sort
 info.isJunction = exitAngles[WIRES].size() >= 3 || exitAngles[BUSES].size() >= 3;
 
 return info;
}