Space out placed footprints with some padding.

Fixes: lp:1788917
* https://bugs.launchpad.net/kicad/+bug/1788917

pcbnew/autorouter/spread_footprints.cpp

@@ -65,6 +65,8 @@ typedef std::vector<TSubRect> CSubRectArray;
 // Use 0.01 mm units to calculate placement, to avoid long calculation time
 const int scale = (int)(0.01 * IU_PER_MM);
 
+const int PADDING = (int)(1 * IU_PER_MM);
+
 // Populates a list of rectangles, from a list of modules
 void fillRectList( CSubRectArray& vecSubRects, std::vector <MODULE*>& aModuleList )
 {
@@ -73,7 +75,8 @@ void fillRectList( CSubRectArray& vecSubRects, std::vector <MODULE*>& aModuleLis
     for( unsigned ii = 0; ii < aModuleList.size(); ii++ )
     {
         EDA_RECT fpBox = aModuleList[ii]->GetFootprintRect();
-        TSubRect fpRect( fpBox.GetWidth()/scale, fpBox.GetHeight()/scale, ii );
+        TSubRect fpRect( ( fpBox.GetWidth() + PADDING ) / scale,
+                         ( fpBox.GetHeight() + PADDING ) / scale, ii );
         vecSubRects.push_back( fpRect );
     }
 }
@@ -284,7 +287,7 @@ void PCB_EDIT_FRAME::SpreadFootprints( std::vector<MODULE*>* aFootprints,
                 islastItem = true;
 
             footprintListBySheet.push_back( footprint );
-            subsurface += footprint->GetArea();
+            subsurface += footprint->GetArea( PADDING );
 
             if( islastItem )
             {

pcbnew/class_module.cpp

@@ -62,7 +62,6 @@ MODULE::MODULE( BOARD* parent ) :
     m_ModuleStatus = MODULE_PADS_LOCKED;
     m_arflag = 0;
     m_CntRot90 = m_CntRot180 = 0;
-    m_Surface  = 0.0;
     m_Link     = 0;
     m_LastEditTime  = 0;
     m_LocalClearance = 0;
@@ -464,7 +463,14 @@ void MODULE::DrawEdgesOnly( EDA_DRAW_PANEL* panel, wxDC* DC, const wxPoint& offs
 void MODULE::CalculateBoundingBox()
 {
     m_BoundaryBox = GetFootprintRect();
-    m_Surface = std::abs( (double) m_BoundaryBox.GetWidth() * m_BoundaryBox.GetHeight() );
+}
+
+
+double MODULE::GetArea( int aPadding ) const
+{
+    double w = std::abs( m_BoundaryBox.GetWidth() ) + aPadding;
+    double h = std::abs( m_BoundaryBox.GetHeight() ) + aPadding;
+    return w * h;
 }
 
 

pcbnew/class_module.h

@@ -569,7 +569,7 @@ public:
      */
     wxString GetNextPadName( bool aFillSequenceGaps ) const;
 
-    double GetArea() const { return m_Surface; }
+    double GetArea( int aPadding = 0 ) const;
 
     timestamp_t GetLink() const { return m_Link; }
     void SetLink( timestamp_t aLink )            { m_Link = aLink; }
@@ -746,7 +746,6 @@ private:
     ZoneConnection m_ZoneConnection;
     timestamp_t m_LastEditTime;
     int m_arflag;           ///< Use to trace ratsnest and auto routing.
-    double m_Surface;       ///< Bounding box area
     timestamp_t m_Link;     ///< Temporary logical link used during editing
     int m_CntRot90;         ///< Horizontal automatic placement cost ( 0..10 ).
     int m_CntRot180;        ///< Vertical automatic placement cost ( 0..10 ).