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diff --git a/src/Xmobar/X11/Boxes.hs b/src/Xmobar/X11/Boxes.hs
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+------------------------------------------------------------------------------
+-- |
+-- Module: Xmobar.X11.Boxes
+-- Copyright: (c) 2022 Jose Antonio Ortega Ruiz
+-- License: BSD3-style (see LICENSE)
+--
+-- Maintainer: jao@gnu.org
+-- Stability: unstable
+-- Portability: unportable
+--Start date: Fri Sep 16, 2022 04:01
+--
+-- Borders and boxes
+--
+------------------------------------------------------------------------------
+
+module Xmobar.X11.Boxes (boxLines, borderRect) where
+
+import Xmobar.Run.Parsers
+import Xmobar.Config.Types
+
+boxLines :: Box -> Double -> Double -> Double -> [(Double, Double, Double, Double)]
+boxLines (Box bd offset lw _ margins) ht x0 x1 =
+  case bd of
+    BBTop  -> [rtop];   BBBottom -> [rbot];   BBVBoth -> [rtop, rbot]
+    BBLeft -> [rleft];  BBRight  -> [rright]; BBHBoth -> [rleft, rright]
+    BBFull -> [rtop, rbot, rleft, rright]
+  where (BoxMargins top right bot left) = margins
+        (BoxOffset align m) = offset
+        ma = fromIntegral m
+        (p0, p1) = case align of L -> (0, -ma); C -> (ma, -ma); R -> (ma, 0)
+        lc = fromIntegral lw / 2
+        [mt, mr, mb, ml] = map fromIntegral [top, right, bot, left]
+        xmin = x0 - ml - lc
+        xmax = x1 + mr + lc
+        ymin = mt + lc
+        ymax = ht - mb - lc
+        rtop = (xmin + p0, ymin, xmax + p1, ymin)
+        rbot = (xmin + p0, ymax, xmax + p1, ymax)
+        rleft = (xmin, ymin + p0, xmin, ymax + p1)
+        rright = (xmax, ymin + p0, xmax, ymax + p1)
+
+borderRect :: Border -> Double -> Double -> (Double, Double, Double, Double)
+borderRect bdr w h =
+  case bdr of
+    TopB -> (0, 0, w - 1, 0)
+    BottomB -> (0, h - 1, w - 1, 0)
+    FullB -> (0, 0, w - 1, h - 1)
+    TopBM m -> (0, fi m, w - 1, 0)
+    BottomBM m -> (0, h - fi m, w - 1, 0)
+    FullBM m -> (fi m, fi m, w - 2 * fi m, h - 2 * fi m)
+    NoBorder -> (-1, -1, -1, -1)
+  where fi = fromIntegral