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diff --git a/src/Xmobar/Draw/Boxes.hs b/src/Xmobar/Draw/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.Draw.Boxes (Line, boxLines, BoxRect, borderRect) where
+
+import qualified Xmobar.Config.Types as T
+import qualified Xmobar.Run.Parsers as P
+
+type Line = (Double, Double, Double, Double)
+type BoxRect = (Double, Double, Double, Double)
+
+-- | Computes the coordinates of a list of lines representing a Box.
+-- The Box is to be positioned between x0 and x1, with height ht, and drawn
+-- with line width lw.  The returned lists are coordinates of the beginning
+-- and end of each line.
+boxLines :: P.Box -> Double -> Double -> Double -> [Line]
+boxLines (P.Box bd offset lw _ margins) ht x0 x1 =
+  case bd of
+    P.BBTop    -> [rtop]
+    P.BBBottom -> [rbot]
+    P.BBVBoth  -> [rtop, rbot]
+    P.BBLeft   -> [rleft]
+    P.BBRight  -> [rright]
+    P.BBHBoth  -> [rleft, rright]
+    P.BBFull   -> [rtop, rbot, rleft, rright]
+  where
+    (P.BoxMargins top right bot left) = margins
+    (P.BoxOffset align m) = offset
+    ma = fromIntegral m
+    (p0, p1) = case align of
+                 T.L -> (0, -ma)
+                 T.C -> (ma, -ma)
+                 T.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)
+
+-- | Computes the rectangle (x, y, width, height) for the given Border.
+borderRect :: T.Border -> Double -> Double -> BoxRect
+borderRect bdr w h =
+  case bdr of
+    T.TopB       -> (0, 0, w - 1, 0)
+    T.BottomB    -> (0, h - 1, w - 1, 0)
+    T.FullB      -> (0, 0, w - 1, h - 1)
+    T.TopBM m    -> (0, fi m, w - 1, 0)
+    T.BottomBM m -> (0, h - fi m, w - 1, 0)
+    T.FullBM m   -> (fi m, fi m, w - 2 * fi m, h - 2 * fi m)
+    T.NoBorder   -> (-1, -1, -1, -1)
+  where fi = fromIntegral