diff --git a/Designing/WinLib/WinCalculate.lua b/Designing/WinLib/WinCalculate.lua
index b03adc4..e831874 100644
--- a/Designing/WinLib/WinCalculate.lua
+++ b/Designing/WinLib/WinCalculate.lua
@@ -1603,6 +1603,11 @@ local function CalcFillGeo( nPartId, nOutlineLayerId)
    if bRect then
       EgtSetInfo( nGeoLayerId, WIN_GEOWIDTH, vtEdge1:len())
       EgtSetInfo( nGeoLayerId, WIN_GEOHEIGHT, vtEdge2:len())
+   else
+      -- se non è rettangolare salvo le dimensioni del suo box orientato in modo ottimale
+      local _, dDim1, dDim2 = EgtCurveMinAreaRectangleXY( nCompo)
+      EgtSetInfo( nGeoLayerId, WIN_GEOWIDTH, dDim1)
+      EgtSetInfo( nGeoLayerId, WIN_GEOHEIGHT, dDim2)
    end
    EgtErase( nCompo)