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<title>XMonad/Layout/ThreeColumns.hs</title>
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<pre><a name="line-1"></a><span class='hs-comment'>{-# LANGUAGE FlexibleInstances, MultiParamTypeClasses #-}</span>
<a name="line-2"></a>
<a name="line-3"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-4"></a><span class='hs-comment'>-- |</span>
<a name="line-5"></a><span class='hs-comment'>-- Module : XMonad.Layout.ThreeColumns</span>
<a name="line-6"></a><span class='hs-comment'>-- Copyright : (c) Kai Grossjohann <kai@emptydomain.de></span>
<a name="line-7"></a><span class='hs-comment'>-- License : BSD3-style (see LICENSE)</span>
<a name="line-8"></a><span class='hs-comment'>--</span>
<a name="line-9"></a><span class='hs-comment'>-- Maintainer : ?</span>
<a name="line-10"></a><span class='hs-comment'>-- Stability : unstable</span>
<a name="line-11"></a><span class='hs-comment'>-- Portability : unportable</span>
<a name="line-12"></a><span class='hs-comment'>--</span>
<a name="line-13"></a><span class='hs-comment'>-- A layout similar to tall but with three columns. With 2560x1600 pixels this</span>
<a name="line-14"></a><span class='hs-comment'>-- layout can be used for a huge main window and up to six reasonable sized</span>
<a name="line-15"></a><span class='hs-comment'>-- slave windows.</span>
<a name="line-16"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-17"></a>
<a name="line-18"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>XMonad</span><span class='hs-varop'>.</span><span class='hs-conid'>Layout</span><span class='hs-varop'>.</span><span class='hs-conid'>ThreeColumns</span> <span class='hs-layout'>(</span>
<a name="line-19"></a> <span class='hs-comment'>-- * Usage</span>
<a name="line-20"></a> <span class='hs-comment'>-- $usage</span>
<a name="line-21"></a>
<a name="line-22"></a> <span class='hs-comment'>-- * Screenshots</span>
<a name="line-23"></a> <span class='hs-comment'>-- $screenshot</span>
<a name="line-24"></a> <span class='hs-conid'>ThreeCol</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span>
<a name="line-25"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-26"></a>
<a name="line-27"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>XMonad</span>
<a name="line-28"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</span> <span class='hs-conid'>XMonad</span><span class='hs-varop'>.</span><span class='hs-conid'>StackSet</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>W</span>
<a name="line-29"></a>
<a name="line-30"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Ratio</span>
<a name="line-31"></a>
<a name="line-32"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span>
<a name="line-33"></a>
<a name="line-34"></a><span class='hs-comment'>-- $usage</span>
<a name="line-35"></a><span class='hs-comment'>-- You can use this module with the following in your @~\/.xmonad\/xmonad.hs@:</span>
<a name="line-36"></a><span class='hs-comment'>--</span>
<a name="line-37"></a><span class='hs-comment'>-- > import XMonad.Layout.ThreeColumns</span>
<a name="line-38"></a><span class='hs-comment'>--</span>
<a name="line-39"></a><span class='hs-comment'>-- Then edit your @layoutHook@ by adding the ThreeCol layout:</span>
<a name="line-40"></a><span class='hs-comment'>--</span>
<a name="line-41"></a><span class='hs-comment'>-- > myLayout = ThreeCol 1 (3/100) (1/2) ||| ThreeColMid 1 (3/100) (1/2) ||| etc..</span>
<a name="line-42"></a><span class='hs-comment'>-- > main = xmonad defaultConfig { layoutHook = myLayout }</span>
<a name="line-43"></a><span class='hs-comment'>--</span>
<a name="line-44"></a><span class='hs-comment'>-- The first argument specifies how many windows initially appear in the main</span>
<a name="line-45"></a><span class='hs-comment'>-- window. The second argument argument specifies the amount to resize while</span>
<a name="line-46"></a><span class='hs-comment'>-- resizing and the third argument specifies the initial size of the columns.</span>
<a name="line-47"></a><span class='hs-comment'>-- A positive size designates the fraction of the screen that the main window</span>
<a name="line-48"></a><span class='hs-comment'>-- should occupy, but if the size is negative the absolute value designates the</span>
<a name="line-49"></a><span class='hs-comment'>-- fraction a slave column should occupy. If both slave columns are visible,</span>
<a name="line-50"></a><span class='hs-comment'>-- they always occupy the same amount of space.</span>
<a name="line-51"></a><span class='hs-comment'>--</span>
<a name="line-52"></a><span class='hs-comment'>-- The ThreeColMid variant places the main window between the slave columns.</span>
<a name="line-53"></a><span class='hs-comment'>--</span>
<a name="line-54"></a><span class='hs-comment'>-- For more detailed instructions on editing the layoutHook see:</span>
<a name="line-55"></a><span class='hs-comment'>--</span>
<a name="line-56"></a><span class='hs-comment'>-- "XMonad.Doc.Extending#Editing_the_layout_hook"</span>
<a name="line-57"></a>
<a name="line-58"></a>
<a name="line-59"></a><span class='hs-comment'>-- $screenshot</span>
<a name="line-60"></a><span class='hs-comment'>-- <<<a href="http://server.c-otto.de/xmonad/ThreeColumnsMiddle.png">http://server.c-otto.de/xmonad/ThreeColumnsMiddle.png</a>>></span>
<a name="line-61"></a>
<a name="line-62"></a><a name="ThreeCol"></a><span class='hs-comment'>-- | Arguments are nmaster, delta, fraction</span>
<a name="line-63"></a><a name="ThreeCol"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>ThreeCol</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ThreeColMid</span> <span class='hs-layout'>{</span> <span class='hs-varid'>threeColNMaster</span> <span class='hs-keyglyph'>::</span> <span class='hs-varop'>!</span><span class='hs-conid'>Int</span><span class='hs-layout'>,</span> <span class='hs-varid'>threeColDelta</span> <span class='hs-keyglyph'>::</span> <span class='hs-varop'>!</span><span class='hs-conid'>Rational</span><span class='hs-layout'>,</span> <span class='hs-varid'>threeColFrac</span> <span class='hs-keyglyph'>::</span> <span class='hs-varop'>!</span><span class='hs-conid'>Rational</span><span class='hs-layout'>}</span>
<a name="line-64"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>ThreeCol</span> <span class='hs-layout'>{</span> <span class='hs-varid'>threeColNMaster</span> <span class='hs-keyglyph'>::</span> <span class='hs-varop'>!</span><span class='hs-conid'>Int</span><span class='hs-layout'>,</span> <span class='hs-varid'>threeColDelta</span> <span class='hs-keyglyph'>::</span> <span class='hs-varop'>!</span><span class='hs-conid'>Rational</span><span class='hs-layout'>,</span> <span class='hs-varid'>threeColFrac</span> <span class='hs-keyglyph'>::</span> <span class='hs-varop'>!</span><span class='hs-conid'>Rational</span><span class='hs-layout'>}</span>
<a name="line-65"></a> <span class='hs-keyword'>deriving</span> <span class='hs-layout'>(</span><span class='hs-conid'>Show</span><span class='hs-layout'>,</span><span class='hs-conid'>Read</span><span class='hs-layout'>)</span>
<a name="line-66"></a>
<a name="line-67"></a><a name="instance%20LayoutClass%20ThreeCol%20a"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>LayoutClass</span> <span class='hs-conid'>ThreeCol</span> <span class='hs-varid'>a</span> <span class='hs-keyword'>where</span>
<a name="line-68"></a> <span class='hs-varid'>pureLayout</span> <span class='hs-layout'>(</span><span class='hs-conid'>ThreeCol</span> <span class='hs-varid'>n</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>f</span><span class='hs-layout'>)</span> <span class='hs-varid'>r</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>doL</span> <span class='hs-conid'>False</span> <span class='hs-varid'>n</span> <span class='hs-varid'>f</span> <span class='hs-varid'>r</span>
<a name="line-69"></a> <span class='hs-varid'>pureLayout</span> <span class='hs-layout'>(</span><span class='hs-conid'>ThreeColMid</span> <span class='hs-varid'>n</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>f</span><span class='hs-layout'>)</span> <span class='hs-varid'>r</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>doL</span> <span class='hs-conid'>True</span> <span class='hs-varid'>n</span> <span class='hs-varid'>f</span> <span class='hs-varid'>r</span>
<a name="line-70"></a> <span class='hs-varid'>handleMessage</span> <span class='hs-varid'>l</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=</span>
<a name="line-71"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-varid'>msum</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>fmap</span> <span class='hs-varid'>resize</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromMessage</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span>
<a name="line-72"></a> <span class='hs-layout'>,</span><span class='hs-varid'>fmap</span> <span class='hs-varid'>incmastern</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromMessage</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-73"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>resize</span> <span class='hs-conid'>Shrink</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>l</span> <span class='hs-layout'>{</span> <span class='hs-varid'>threeColFrac</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>max</span> <span class='hs-layout'>(</span><span class='hs-comment'>-</span><span class='hs-num'>0.5</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span> <span class='hs-varid'>f</span><span class='hs-comment'>-</span><span class='hs-varid'>d</span> <span class='hs-layout'>}</span>
<a name="line-74"></a> <span class='hs-varid'>resize</span> <span class='hs-conid'>Expand</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>l</span> <span class='hs-layout'>{</span> <span class='hs-varid'>threeColFrac</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>min</span> <span class='hs-num'>1</span> <span class='hs-varop'>$</span> <span class='hs-varid'>f</span><span class='hs-varop'>+</span><span class='hs-varid'>d</span> <span class='hs-layout'>}</span>
<a name="line-75"></a> <span class='hs-varid'>incmastern</span> <span class='hs-layout'>(</span><span class='hs-conid'>IncMasterN</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>l</span> <span class='hs-layout'>{</span> <span class='hs-varid'>threeColNMaster</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>max</span> <span class='hs-num'>0</span> <span class='hs-layout'>(</span><span class='hs-varid'>n</span><span class='hs-varop'>+</span><span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-layout'>}</span>
<a name="line-76"></a> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>threeColNMaster</span> <span class='hs-varid'>l</span>
<a name="line-77"></a> <span class='hs-varid'>d</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>threeColDelta</span> <span class='hs-varid'>l</span>
<a name="line-78"></a> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>threeColFrac</span> <span class='hs-varid'>l</span>
<a name="line-79"></a> <span class='hs-varid'>description</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-str'>"ThreeCol"</span>
<a name="line-80"></a>
<a name="line-81"></a><a name="doL"></a><span class='hs-definition'>doL</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Bool</span><span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span><span class='hs-keyglyph'>-></span> <span class='hs-conid'>Rational</span><span class='hs-keyglyph'>-></span> <span class='hs-conid'>Rectangle</span><span class='hs-keyglyph'>-></span> <span class='hs-conid'>W</span><span class='hs-varop'>.</span><span class='hs-conid'>Stack</span> <span class='hs-varid'>a</span><span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-conid'>Rectangle</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-82"></a><span class='hs-definition'>doL</span> <span class='hs-varid'>m</span> <span class='hs-varid'>n</span> <span class='hs-varid'>f</span> <span class='hs-varid'>r</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>ap</span> <span class='hs-varid'>zip</span> <span class='hs-layout'>(</span><span class='hs-varid'>tile3</span> <span class='hs-varid'>m</span> <span class='hs-varid'>f</span> <span class='hs-varid'>r</span> <span class='hs-varid'>n</span> <span class='hs-varop'>.</span> <span class='hs-varid'>length</span><span class='hs-layout'>)</span> <span class='hs-varop'>.</span> <span class='hs-conid'>W</span><span class='hs-varop'>.</span><span class='hs-varid'>integrate</span>
<a name="line-83"></a>
<a name="line-84"></a><a name="tile3"></a><span class='hs-comment'>-- | tile3. Compute window positions using 3 panes</span>
<a name="line-85"></a><span class='hs-definition'>tile3</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Bool</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Rational</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Rectangle</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Rectangle</span><span class='hs-keyglyph'>]</span>
<a name="line-86"></a><span class='hs-definition'>tile3</span> <span class='hs-varid'>middle</span> <span class='hs-varid'>f</span> <span class='hs-varid'>r</span> <span class='hs-varid'>nmaster</span> <span class='hs-varid'>n</span>
<a name="line-87"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>n</span> <span class='hs-varop'><=</span> <span class='hs-varid'>nmaster</span> <span class='hs-varop'>||</span> <span class='hs-varid'>nmaster</span> <span class='hs-varop'>==</span> <span class='hs-num'>0</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>splitVertically</span> <span class='hs-varid'>n</span> <span class='hs-varid'>r</span>
<a name="line-88"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>n</span> <span class='hs-varop'><=</span> <span class='hs-varid'>nmaster</span><span class='hs-varop'>+</span><span class='hs-num'>1</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>splitVertically</span> <span class='hs-varid'>nmaster</span> <span class='hs-varid'>s1</span> <span class='hs-varop'>++</span> <span class='hs-varid'>splitVertically</span> <span class='hs-layout'>(</span><span class='hs-varid'>n</span><span class='hs-comment'>-</span><span class='hs-varid'>nmaster</span><span class='hs-layout'>)</span> <span class='hs-varid'>s2</span>
<a name="line-89"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>splitVertically</span> <span class='hs-varid'>nmaster</span> <span class='hs-varid'>r1</span> <span class='hs-varop'>++</span> <span class='hs-varid'>splitVertically</span> <span class='hs-varid'>nslave1</span> <span class='hs-varid'>r2</span> <span class='hs-varop'>++</span> <span class='hs-varid'>splitVertically</span> <span class='hs-varid'>nslave2</span> <span class='hs-varid'>r3</span>
<a name="line-90"></a> <span class='hs-keyword'>where</span> <span class='hs-layout'>(</span><span class='hs-varid'>r1</span><span class='hs-layout'>,</span> <span class='hs-varid'>r2</span><span class='hs-layout'>,</span> <span class='hs-varid'>r3</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>split3HorizontallyBy</span> <span class='hs-varid'>middle</span> <span class='hs-layout'>(</span><span class='hs-keyword'>if</span> <span class='hs-varid'>f</span><span class='hs-varop'><</span><span class='hs-num'>0</span> <span class='hs-keyword'>then</span> <span class='hs-num'>1</span><span class='hs-varop'>+</span><span class='hs-num'>2</span><span class='hs-varop'>*</span><span class='hs-varid'>f</span> <span class='hs-keyword'>else</span> <span class='hs-varid'>f</span><span class='hs-layout'>)</span> <span class='hs-varid'>r</span>
<a name="line-91"></a> <span class='hs-layout'>(</span><span class='hs-varid'>s1</span><span class='hs-layout'>,</span> <span class='hs-varid'>s2</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>splitHorizontallyBy</span> <span class='hs-layout'>(</span><span class='hs-keyword'>if</span> <span class='hs-varid'>f</span><span class='hs-varop'><</span><span class='hs-num'>0</span> <span class='hs-keyword'>then</span> <span class='hs-num'>1</span><span class='hs-varop'>+</span><span class='hs-varid'>f</span> <span class='hs-keyword'>else</span> <span class='hs-varid'>f</span><span class='hs-layout'>)</span> <span class='hs-varid'>r</span>
<a name="line-92"></a> <span class='hs-varid'>nslave</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>n</span> <span class='hs-comment'>-</span> <span class='hs-varid'>nmaster</span><span class='hs-layout'>)</span>
<a name="line-93"></a> <span class='hs-varid'>nslave1</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>ceiling</span> <span class='hs-layout'>(</span><span class='hs-varid'>nslave</span> <span class='hs-varop'>%</span> <span class='hs-num'>2</span><span class='hs-layout'>)</span>
<a name="line-94"></a> <span class='hs-varid'>nslave2</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>n</span> <span class='hs-comment'>-</span> <span class='hs-varid'>nmaster</span> <span class='hs-comment'>-</span> <span class='hs-varid'>nslave1</span><span class='hs-layout'>)</span>
<a name="line-95"></a>
<a name="line-96"></a><a name="split3HorizontallyBy"></a><span class='hs-definition'>split3HorizontallyBy</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Bool</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Rational</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Rectangle</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-conid'>Rectangle</span><span class='hs-layout'>,</span> <span class='hs-conid'>Rectangle</span><span class='hs-layout'>,</span> <span class='hs-conid'>Rectangle</span><span class='hs-layout'>)</span>
<a name="line-97"></a><span class='hs-definition'>split3HorizontallyBy</span> <span class='hs-varid'>middle</span> <span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-conid'>Rectangle</span> <span class='hs-varid'>sx</span> <span class='hs-varid'>sy</span> <span class='hs-varid'>sw</span> <span class='hs-varid'>sh</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span>
<a name="line-98"></a> <span class='hs-keyword'>if</span> <span class='hs-varid'>middle</span>
<a name="line-99"></a> <span class='hs-keyword'>then</span> <span class='hs-layout'>(</span> <span class='hs-conid'>Rectangle</span> <span class='hs-layout'>(</span><span class='hs-varid'>sx</span> <span class='hs-varop'>+</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>r3w</span><span class='hs-layout'>)</span> <span class='hs-varid'>sy</span> <span class='hs-varid'>r1w</span> <span class='hs-varid'>sh</span>
<a name="line-100"></a> <span class='hs-layout'>,</span> <span class='hs-conid'>Rectangle</span> <span class='hs-layout'>(</span><span class='hs-varid'>sx</span> <span class='hs-varop'>+</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>r3w</span> <span class='hs-varop'>+</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>r1w</span><span class='hs-layout'>)</span> <span class='hs-varid'>sy</span> <span class='hs-varid'>r2w</span> <span class='hs-varid'>sh</span>
<a name="line-101"></a> <span class='hs-layout'>,</span> <span class='hs-conid'>Rectangle</span> <span class='hs-varid'>sx</span> <span class='hs-varid'>sy</span> <span class='hs-varid'>r3w</span> <span class='hs-varid'>sh</span> <span class='hs-layout'>)</span>
<a name="line-102"></a> <span class='hs-keyword'>else</span> <span class='hs-layout'>(</span> <span class='hs-conid'>Rectangle</span> <span class='hs-varid'>sx</span> <span class='hs-varid'>sy</span> <span class='hs-varid'>r1w</span> <span class='hs-varid'>sh</span>
<a name="line-103"></a> <span class='hs-layout'>,</span> <span class='hs-conid'>Rectangle</span> <span class='hs-layout'>(</span><span class='hs-varid'>sx</span> <span class='hs-varop'>+</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>r1w</span><span class='hs-layout'>)</span> <span class='hs-varid'>sy</span> <span class='hs-varid'>r2w</span> <span class='hs-varid'>sh</span>
<a name="line-104"></a> <span class='hs-layout'>,</span> <span class='hs-conid'>Rectangle</span> <span class='hs-layout'>(</span><span class='hs-varid'>sx</span> <span class='hs-varop'>+</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>r1w</span> <span class='hs-varop'>+</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>r2w</span><span class='hs-layout'>)</span> <span class='hs-varid'>sy</span> <span class='hs-varid'>r3w</span> <span class='hs-varid'>sh</span> <span class='hs-layout'>)</span>
<a name="line-105"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>r1w</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>ceiling</span> <span class='hs-varop'>$</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>sw</span> <span class='hs-varop'>*</span> <span class='hs-varid'>f</span>
<a name="line-106"></a> <span class='hs-varid'>r2w</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>ceiling</span> <span class='hs-layout'>(</span> <span class='hs-layout'>(</span><span class='hs-varid'>sw</span> <span class='hs-comment'>-</span> <span class='hs-varid'>r1w</span><span class='hs-layout'>)</span> <span class='hs-varop'>%</span> <span class='hs-num'>2</span> <span class='hs-layout'>)</span>
<a name="line-107"></a> <span class='hs-varid'>r3w</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>sw</span> <span class='hs-comment'>-</span> <span class='hs-varid'>r1w</span> <span class='hs-comment'>-</span> <span class='hs-varid'>r2w</span>
</pre></body>
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