pcbnew: Retain 45° constraint

This also finishes the polygon with 45° lines when chosen as a create
option.

Fixes: lp:1833673
* https://bugs.launchpad.net/kicad/+bug/1833673

common/preview_items/polygon_geom_manager.cpp

@@ -20,6 +20,7 @@
  * or you may write to the Free Software Foundation, Inc.,
  * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
  */
+#include <limits>
 
 #include <preview_items/polygon_geom_manager.h>
 
@@ -67,6 +68,7 @@ bool POLYGON_GEOM_MANAGER::AddPoint( const VECTOR2I& aPt )
 
 void POLYGON_GEOM_MANAGER::SetFinished()
 {
+
     m_client.OnComplete( *this );
 }
 
@@ -144,16 +146,44 @@ void POLYGON_GEOM_MANAGER::updateLeaderPoints( const VECTOR2I& aEndPoint, LEADER
 {
     wxCHECK( m_lockedPoints.PointCount() > 0, /*void*/ );
     const VECTOR2I& lastPt = m_lockedPoints.CLastPoint();
-    auto newEnd = VECTOR2I( aEndPoint );
 
     if( m_leaderMode == LEADER_MODE::DEG45 || aModifier == LEADER_MODE::DEG45 )
     {
         const VECTOR2I lineVector( aEndPoint - lastPt );
         // get a restricted 45/H/V line from the last fixed point to the cursor
-        newEnd = lastPt + GetVectorSnapped45( lineVector );
+        auto newEnd = lastPt + GetVectorSnapped45( lineVector );
+
+        SEG first( lastPt, newEnd );
+        SEG test_seg = m_lockedPoints.CSegment( 0 );
+
+        auto pt = first.IntersectLines( m_lockedPoints.CSegment( 0 ) );
+        int  dist = pt ? ( aEndPoint - *pt ).EuclideanNorm() : std::numeric_limits<int>::max();
+
+        for( int i = 1; i < 8; i++ )
+        {
+            test_seg.B = ( test_seg.B - test_seg.A ).Rotate( M_PI_4 ) + test_seg.A;
+            auto pt2 = first.IntersectLines( test_seg );
+            if( pt2 )
+            {
+                int dist2 = ( aEndPoint - *pt2 ).EuclideanNorm();
+                if( dist2 < dist )
+                {
+                    dist = dist2;
+                    pt = pt2;
+                }
+            }
         }
 
-    // direct segment
         m_leaderPts = SHAPE_LINE_CHAIN( lastPt, newEnd );
+
+        if( pt )
+            m_leaderPts.Append( *pt );
+    }
+    else
+    {
+        // direct segment
+        m_leaderPts = SHAPE_LINE_CHAIN( lastPt, aEndPoint );
+    }
+
     m_client.OnGeometryChange( *this );
 }

include/preview_items/polygon_geom_manager.h

@@ -95,6 +95,11 @@ public:
      */
     void SetLeaderMode( LEADER_MODE aMode );
 
+    LEADER_MODE GetLeaderMode() const
+    {
+        return m_leaderMode;
+    }
+
     /**
      * Enables/disables self-intersecting polygons.
      * @param aEnabled true if self-intersecting polygons are enabled.

pcbnew/tools/edit_points.cpp

@@ -36,30 +36,27 @@ bool EDIT_POINT::WithinPoint( const VECTOR2I& aPoint, unsigned int aSize ) const
 }
 
 
-EDIT_POINTS::EDIT_POINTS( EDA_ITEM* aParent ) :
-    EDA_ITEM( NOT_USED ), m_parent( aParent )
+EDIT_POINTS::EDIT_POINTS( EDA_ITEM* aParent )
+        : EDA_ITEM( NOT_USED ), m_parent( aParent ), m_allowPoints( true )
 {
 }
 
 
 EDIT_POINT* EDIT_POINTS::FindPoint( const VECTOR2I& aLocation, KIGFX::VIEW *aView ) // fixme: ugly
 {
-    float size = aView->ToWorld( EDIT_POINT::POINT_SIZE );
+    unsigned size = std::abs<int>( KiROUND( aView->ToWorld( EDIT_POINT::POINT_SIZE ) ) );
 
-    std::deque<EDIT_POINT>::iterator pit, pitEnd;
-    for( pit = m_points.begin(), pitEnd = m_points.end(); pit != pitEnd; ++pit )
+    if( m_allowPoints )
+    {
+        for( auto& point : m_points )
         {
-        EDIT_POINT& point = *pit;
-
             if( point.WithinPoint( aLocation, size ) )
                 return &point;
         }
+    }
 
-    std::deque<EDIT_LINE>::iterator lit, litEnd;
-    for( lit = m_lines.begin(), litEnd = m_lines.end(); lit != litEnd; ++lit )
+    for( auto& line : m_lines )
     {
-        EDIT_LINE& line = *lit;
-
         if( line.WithinPoint( aLocation, size ) )
             return &line;
     }

pcbnew/tools/edit_points.h

@@ -219,11 +219,11 @@ public:
     ///> @copydoc EDIT_POINT::ApplyConstraint()
     virtual void ApplyConstraint() override
     {
-        m_origin.ApplyConstraint();
-        m_end.ApplyConstraint();
-
         if( m_constraint )
             m_constraint->Apply();
+
+        m_origin.ApplyConstraint();
+        m_end.ApplyConstraint();
     }
 
     /**
@@ -492,6 +492,17 @@ public:
         return m_lines.size();
     }
 
+    void SetAllowPoints( bool aAllow = true )
+    {
+        m_allowPoints = aAllow;
+    }
+
+    bool GetAllowPoints() const
+    {
+        return m_allowPoints;
+    }
+
+
     ///> @copydoc VIEW_ITEM::ViewBBox()
     virtual const BOX2I ViewBBox() const override;
 
@@ -524,6 +535,7 @@ private:
     std::deque<EDIT_POINT> m_points;    ///< EDIT_POINTs for modifying m_parent
     std::deque<EDIT_LINE> m_lines;      ///< EDIT_LINEs for modifying m_parent
     std::list<int> m_contours;          ///< Indices of end contour points
+    bool m_allowPoints;                 ///< If false, only allow editing of EDIT_LINES
 };
 
 #endif /* EDIT_POINTS_H_ */

pcbnew/tools/point_editor.cpp

@@ -200,6 +200,7 @@ public:
             {
                 auto zone = static_cast<const ZONE_CONTAINER*>( aItem );
                 buildForPolyOutline( points, zone->Outline(), aGal );
+                points->SetAllowPoints( !zone->GetHV45() );
                 break;
             }
 
@@ -367,7 +368,10 @@ int POINT_EDITOR::OnSelectionChange( const TOOL_EVENT& aEvent )
             //TODO: unify the constraints to solve simultaneously instead of sequentially
             m_editedPoint->SetPosition( grid.BestSnapAnchor( evt->Position(),
                     snapLayers, { item } ) );
-            bool enableAltConstraint = !!evt->Modifier( MD_CTRL );
+
+            // The alternative constraint limits to 45°
+            bool enableAltConstraint =
+                    ( !!evt->Modifier( MD_CTRL ) || !m_editPoints->GetAllowPoints() );
 
             if( enableAltConstraint != (bool) m_altConstraint )  // alternative constraint
                 setAltConstraint( enableAltConstraint );

pcbnew/tools/zone_create_helper.cpp

@@ -295,6 +295,22 @@ void ZONE_CREATE_HELPER::OnComplete( const POLYGON_GEOM_MANAGER& aMgr )
             outline->Append( finalPoints.CPoint( i ) );
         }
 
+        // In DEG45 mode, we may have intermediate points in the leader that should be
+        // included as they are shown in the preview.  These typically maintain the
+        // 45 constraint
+        if( aMgr.GetLeaderMode() == POLYGON_GEOM_MANAGER::LEADER_MODE::DEG45 )
+        {
+            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++ )
+                outline->Append( pts.CPoint( i ) );
+        }
+
         outline->Outline( 0 ).SetClosed( true );
         outline->RemoveNullSegments();