pcbnew: Commit polygon points to new constrained zone

Adds leader points if they are not already existing in the zone

Fixes: lp:1846028
* https://bugs.launchpad.net/kicad/+bug/1846028

common/preview_items/polygon_geom_manager.cpp

@@ -97,9 +97,9 @@ bool POLYGON_GEOM_MANAGER::IsSelfIntersecting( bool aIncludeLeaderPts ) const
 }
 
 
-void POLYGON_GEOM_MANAGER::SetCursorPosition( const VECTOR2I& aPos, LEADER_MODE aModifier )
+void POLYGON_GEOM_MANAGER::SetCursorPosition( const VECTOR2I& aPos )
 {
-    updateLeaderPoints( aPos, aModifier );
+    updateLeaderPoints( aPos );
 }
 
 
@@ -181,8 +181,14 @@ void POLYGON_GEOM_MANAGER::updateLeaderPoints( const VECTOR2I& aEndPoint, LEADER
         m_leaderPts = SHAPE_LINE_CHAIN( lastPt, newEnd );
 
         if( pt )
+        {
+            // This checks for backtracking from the point to intersection
+            if( SEG( lastPt, newEnd ).Collinear( SEG( newEnd, *pt ) ) )
+                m_leaderPts = SHAPE_LINE_CHAIN( lastPt, *pt );
+            else
                 m_leaderPts.Append( *pt );
         }
+    }
     else
     {
         // direct segment

include/preview_items/polygon_geom_manager.h

@@ -128,7 +128,7 @@ public:
     /**
      * Set the current cursor position
      */
-    void SetCursorPosition( const VECTOR2I& aPos, LEADER_MODE aModifier );
+    void SetCursorPosition( const VECTOR2I& aPos );
 
     /**
      * @return true if the polygon in "in progress", i.e. it has at least

pcbnew/tools/drawing_tool.cpp

@@ -1420,6 +1420,7 @@ int DRAWING_TOOL::DrawZone( const TOOL_EVENT& aEvent )
     // the geometry manager which handles the zone geometry, and
     // hands the calculated points over to the zone creator tool
     POLYGON_GEOM_MANAGER polyGeomMgr( zoneTool );
+    bool constrainAngle = false;
 
     std::string tool = aEvent.GetCommandStr().get();
     m_frame->PushTool( tool );
@@ -1450,6 +1451,11 @@ int DRAWING_TOOL::DrawZone( const TOOL_EVENT& aEvent )
                 evt->IsPrime() ? evt->Position() : m_controls->GetMousePosition(), layers );
         m_controls->ForceCursorPosition( true, cursorPos );
 
+        if( ( sourceZone && sourceZone->GetHV45() ) || constrainAngle || evt->Modifier( MD_CTRL ) )
+            polyGeomMgr.SetLeaderMode( POLYGON_GEOM_MANAGER::LEADER_MODE::DEG45 );
+        else
+            polyGeomMgr.SetLeaderMode( POLYGON_GEOM_MANAGER::LEADER_MODE::DIRECT );
+
         auto cleanup = [&] () {
             polyGeomMgr.Reset();
             started = false;
@@ -1524,6 +1530,8 @@ int DRAWING_TOOL::DrawZone( const TOOL_EVENT& aEvent )
                 if( !started )
                 {
                     started = true;
+                    constrainAngle = ( polyGeomMgr.GetLeaderMode() ==
+                            POLYGON_GEOM_MANAGER::LEADER_MODE::DEG45 );
                     m_controls->SetAutoPan( true );
                     m_controls->CaptureCursor( true );
                 }
@@ -1547,9 +1555,7 @@ int DRAWING_TOOL::DrawZone( const TOOL_EVENT& aEvent )
         else if( polyGeomMgr.IsPolygonInProgress()
                  && ( evt->IsMotion() || evt->IsDrag( BUT_LEFT ) ) )
         {
-            polyGeomMgr.SetCursorPosition( cursorPos, evt->Modifier( MD_CTRL )
-                                                      ? POLYGON_GEOM_MANAGER::LEADER_MODE::DEG45
-                                                      : POLYGON_GEOM_MANAGER::LEADER_MODE::DIRECT );
+            polyGeomMgr.SetCursorPosition( cursorPos );
 
             if( polyGeomMgr.IsSelfIntersecting( true ) )
             {

pcbnew/tools/zone_create_helper.cpp

@@ -60,6 +60,7 @@ std::unique_ptr<ZONE_CONTAINER> ZONE_CREATE_HELPER::createNewZone( bool aKeepout
     zoneInfo.m_CurrentZone_Layer = m_params.m_layer;
     zoneInfo.m_NetcodeSelection = board.GetHighLightNetCode();
     zoneInfo.SetIsKeepout( m_params.m_keepout );
+    zoneInfo.m_Zone_45_Only = ( m_params.m_leaderMode == POLYGON_GEOM_MANAGER::LEADER_MODE::DEG45 );
 
     if( m_params.m_mode != ZONE_MODE::GRAPHIC_POLYGON )
     {
@@ -285,14 +286,18 @@ void ZONE_CREATE_HELPER::OnComplete( const POLYGON_GEOM_MANAGER& aMgr )
         {
             auto pts = aMgr.GetLeaderLinePoints();
 
-            if( outline->TotalVertices() > 0 )
-                outline->RemoveVertex( outline->TotalVertices() - 1 );
-
             // The first 2 points of the leader are the continuation of the previous segment
             // The third point is where it intersects with the extension from the 0-th segment
-            for( int i = 2; i < pts.PointCount(); i++ )
+            for( int i = 0; i < pts.PointCount(); i++ )
+            {
+                auto pt = pts.CPoint( i );
+
+                // If we have at least 2 points, then we need to check if the leader points
+                // already exist before re-adding them to the finalized polygon
+                if( pts.PointCount() < 2 || ( pts.CPoint( -1 ) != pt && pts.CPoint( -2 ) != pt ) )
                     outline->Append( pts.CPoint( i ) );
             }
+        }
 
         outline->Outline( 0 ).SetClosed( true );
         outline->RemoveNullSegments();

pcbnew/tools/zone_create_helper.h

@@ -60,6 +60,9 @@ public:
 
         ///> Zone settings source (for similar and cutout zones)
         ZONE_CONTAINER* m_sourceZone;
+
+        ///> Zone leader mode
+        POLYGON_GEOM_MANAGER::LEADER_MODE m_leaderMode;
     };
 
     /**