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<title>XMonad/Layout/MultiColumns.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.MultiColumns</span>
<a name="line-6"></a><span class='hs-comment'>-- Copyright : (c) Anders Engstrom <ankaan@gmail.com></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 : Anders Engstrom <ankaan@gmail.com></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'>-- This layout tiles windows in a growing number of columns. The number of</span>
<a name="line-14"></a><span class='hs-comment'>-- windows in each column can be controlled by messages.</span>
<a name="line-15"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-16"></a>
<a name="line-17"></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'>MultiColumns</span> <span class='hs-layout'>(</span>
<a name="line-18"></a> <span class='hs-comment'>-- * Usage</span>
<a name="line-19"></a> <span class='hs-comment'>-- $usage</span>
<a name="line-20"></a>
<a name="line-21"></a> <span class='hs-varid'>multiCol</span><span class='hs-layout'>,</span>
<a name="line-22"></a> <span class='hs-conid'>MultiCol</span><span class='hs-layout'>,</span>
<a name="line-23"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-24"></a>
<a name="line-25"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>XMonad</span>
<a name="line-26"></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-27"></a>
<a name="line-28"></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-29"></a>
<a name="line-30"></a><span class='hs-comment'>-- $usage</span>
<a name="line-31"></a><span class='hs-comment'>-- You can use this module with the following in your @~\/.xmonad\/xmonad.hs@:</span>
<a name="line-32"></a><span class='hs-comment'>--</span>
<a name="line-33"></a><span class='hs-comment'>-- > import XMonad.Layout.MultiColumns</span>
<a name="line-34"></a><span class='hs-comment'>--</span>
<a name="line-35"></a><span class='hs-comment'>-- Then edit your @layoutHook@ by adding the multiCol layout:</span>
<a name="line-36"></a><span class='hs-comment'>--</span>
<a name="line-37"></a><span class='hs-comment'>-- > myLayouts = multiCol [1] 4 0.01 0.5 ||| etc..</span>
<a name="line-38"></a><span class='hs-comment'>-- > main = xmonad defaultConfig { layoutHook = myLayouts }</span>
<a name="line-39"></a><span class='hs-comment'>--</span>
<a name="line-40"></a><span class='hs-comment'>-- Or alternatively:</span>
<a name="line-41"></a><span class='hs-comment'>--</span>
<a name="line-42"></a><span class='hs-comment'>-- > myLayouts = Mirror (multiCol [1] 2 0.01 (-0.25)) ||| etc..</span>
<a name="line-43"></a><span class='hs-comment'>-- > main = xmonad defaultConfig { layoutHook = myLayouts }</span>
<a name="line-44"></a><span class='hs-comment'>--</span>
<a name="line-45"></a><span class='hs-comment'>-- The maximum number of windows in a column can be controlled using the</span>
<a name="line-46"></a><span class='hs-comment'>-- IncMasterN messages and the column containing the focused window will be</span>
<a name="line-47"></a><span class='hs-comment'>-- modified. If the value is 0, all remaining windows will be placed in that</span>
<a name="line-48"></a><span class='hs-comment'>-- column when all columns before that has been filled.</span>
<a name="line-49"></a><span class='hs-comment'>--</span>
<a name="line-50"></a><span class='hs-comment'>-- The size can be set to between 1 and -0.5. If the value is positive, the</span>
<a name="line-51"></a><span class='hs-comment'>-- master column will be of that size. The rest of the screen is split among</span>
<a name="line-52"></a><span class='hs-comment'>-- the other columns. But if the size is negative, it instead indicates the</span>
<a name="line-53"></a><span class='hs-comment'>-- size of all non-master columns and the master column will cover the rest of</span>
<a name="line-54"></a><span class='hs-comment'>-- the screen. If the master column would become smaller than the other</span>
<a name="line-55"></a><span class='hs-comment'>-- columns, the screen is instead split equally among all columns. Therefore,</span>
<a name="line-56"></a><span class='hs-comment'>-- if equal size among all columns are desired, set the size to -0.5.</span>
<a name="line-57"></a><span class='hs-comment'>--</span>
<a name="line-58"></a><span class='hs-comment'>-- For more detailed instructions on editing the layoutHook see:</span>
<a name="line-59"></a><span class='hs-comment'>--</span>
<a name="line-60"></a><span class='hs-comment'>-- "XMonad.Doc.Extending#Editing_the_layout_hook"</span>
<a name="line-61"></a>
<a name="line-62"></a><a name="multiCol"></a><span class='hs-comment'>-- | Layout constructor.</span>
<a name="line-63"></a><span class='hs-definition'>multiCol</span>
<a name="line-64"></a> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Int</span><span class='hs-keyglyph'>]</span> <span class='hs-comment'>-- ^ Windows in each column, starting with master. Set to 0 to catch the rest.</span>
<a name="line-65"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-comment'>-- ^ Default value for all following columns.</span>
<a name="line-66"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Rational</span> <span class='hs-comment'>-- ^ How much to change size each time.</span>
<a name="line-67"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Rational</span> <span class='hs-comment'>-- ^ Initial size of master area, or column area if the size is negative.</span>
<a name="line-68"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>MultiCol</span> <span class='hs-varid'>a</span>
<a name="line-69"></a><span class='hs-definition'>multiCol</span> <span class='hs-varid'>n</span> <span class='hs-varid'>defn</span> <span class='hs-varid'>ds</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>MultiCol</span> <span class='hs-layout'>(</span><span class='hs-varid'>map</span> <span class='hs-layout'>(</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-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>max</span> <span class='hs-num'>0</span> <span class='hs-varid'>defn</span><span class='hs-layout'>)</span> <span class='hs-varid'>ds</span> <span class='hs-varid'>s</span> <span class='hs-num'>0</span>
<a name="line-70"></a>
<a name="line-71"></a><a name="MultiCol"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>MultiCol</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>MultiCol</span>
<a name="line-72"></a> <span class='hs-layout'>{</span> <span class='hs-varid'>multiColNWin</span> <span class='hs-keyglyph'>::</span> <span class='hs-varop'>!</span><span class='hs-keyglyph'>[</span><span class='hs-conid'>Int</span><span class='hs-keyglyph'>]</span>
<a name="line-73"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>multiColDefWin</span> <span class='hs-keyglyph'>::</span> <span class='hs-varop'>!</span><span class='hs-conid'>Int</span>
<a name="line-74"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>multiColDeltaSize</span> <span class='hs-keyglyph'>::</span> <span class='hs-varop'>!</span><span class='hs-conid'>Rational</span>
<a name="line-75"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>multiColSize</span> <span class='hs-keyglyph'>::</span> <span class='hs-varop'>!</span><span class='hs-conid'>Rational</span>
<a name="line-76"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>multiColActive</span> <span class='hs-keyglyph'>::</span> <span class='hs-varop'>!</span><span class='hs-conid'>Int</span>
<a name="line-77"></a> <span class='hs-layout'>}</span> <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><span class='hs-conid'>Eq</span><span class='hs-layout'>)</span>
<a name="line-78"></a>
<a name="line-79"></a><a name="instance%20LayoutClass%20MultiCol%20a"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>LayoutClass</span> <span class='hs-conid'>MultiCol</span> <span class='hs-varid'>a</span> <span class='hs-keyword'>where</span>
<a name="line-80"></a> <span class='hs-varid'>doLayout</span> <span class='hs-varid'>l</span> <span class='hs-varid'>r</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>zip</span> <span class='hs-varid'>w</span> <span class='hs-varid'>rlist</span><span class='hs-layout'>,</span> <span class='hs-varid'>resl</span><span class='hs-layout'>)</span>
<a name="line-81"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>rlist</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>doL</span> <span class='hs-layout'>(</span><span class='hs-varid'>multiColNWin</span> <span class='hs-varid'>l'</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>multiColSize</span> <span class='hs-varid'>l'</span><span class='hs-layout'>)</span> <span class='hs-varid'>r</span> <span class='hs-varid'>wlen</span>
<a name="line-82"></a> <span class='hs-varid'>w</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>W</span><span class='hs-varop'>.</span><span class='hs-varid'>integrate</span> <span class='hs-varid'>s</span>
<a name="line-83"></a> <span class='hs-varid'>wlen</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>length</span> <span class='hs-varid'>w</span>
<a name="line-84"></a> <span class='hs-comment'>-- Make sure the list of columns is big enough and update active column</span>
<a name="line-85"></a> <span class='hs-varid'>nw</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>multiColNWin</span> <span class='hs-varid'>l</span> <span class='hs-varop'>++</span> <span class='hs-varid'>repeat</span> <span class='hs-layout'>(</span><span class='hs-varid'>multiColDefWin</span> <span class='hs-varid'>l</span><span class='hs-layout'>)</span>
<a name="line-86"></a> <span class='hs-varid'>l'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>l</span> <span class='hs-layout'>{</span> <span class='hs-varid'>multiColNWin</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>take</span> <span class='hs-layout'>(</span><span class='hs-varid'>max</span> <span class='hs-layout'>(</span><span class='hs-varid'>length</span> <span class='hs-varop'>$</span> <span class='hs-varid'>multiColNWin</span> <span class='hs-varid'>l</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span> <span class='hs-varid'>getCol</span> <span class='hs-layout'>(</span><span class='hs-varid'>wlen</span><span class='hs-comment'>-</span><span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-varid'>nw</span> <span class='hs-varop'>+</span> <span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-varid'>nw</span>
<a name="line-87"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>multiColActive</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>getCol</span> <span class='hs-layout'>(</span><span class='hs-varid'>length</span> <span class='hs-varop'>$</span> <span class='hs-conid'>W</span><span class='hs-varop'>.</span><span class='hs-varid'>up</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-varid'>nw</span>
<a name="line-88"></a> <span class='hs-layout'>}</span>
<a name="line-89"></a> <span class='hs-comment'>-- Only return new layout if it has been modified</span>
<a name="line-90"></a> <span class='hs-varid'>resl</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>l'</span><span class='hs-varop'>==</span><span class='hs-varid'>l</span>
<a name="line-91"></a> <span class='hs-keyword'>then</span> <span class='hs-conid'>Nothing</span>
<a name="line-92"></a> <span class='hs-keyword'>else</span> <span class='hs-conid'>Just</span> <span class='hs-varid'>l'</span>
<a name="line-93"></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-94"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-varid'>msum</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>fmap</span> <span class='hs-varid'>resize</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromMessage</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span>
<a name="line-95"></a> <span class='hs-layout'>,</span><span class='hs-varid'>fmap</span> <span class='hs-varid'>incmastern</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromMessage</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-96"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>resize</span> <span class='hs-conid'>Shrink</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>l</span> <span class='hs-layout'>{</span> <span class='hs-varid'>multiColSize</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>max</span> <span class='hs-layout'>(</span><span class='hs-comment'>-</span><span class='hs-num'>0.5</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span> <span class='hs-varid'>s</span><span class='hs-comment'>-</span><span class='hs-varid'>ds</span> <span class='hs-layout'>}</span>
<a name="line-97"></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'>multiColSize</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>min</span> <span class='hs-num'>1</span> <span class='hs-varop'>$</span> <span class='hs-varid'>s</span><span class='hs-varop'>+</span><span class='hs-varid'>ds</span> <span class='hs-layout'>}</span>
<a name="line-98"></a> <span class='hs-varid'>incmastern</span> <span class='hs-layout'>(</span><span class='hs-conid'>IncMasterN</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>l</span> <span class='hs-layout'>{</span> <span class='hs-varid'>multiColNWin</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>take</span> <span class='hs-varid'>a</span> <span class='hs-varid'>n</span> <span class='hs-varop'>++</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>newval</span><span class='hs-keyglyph'>]</span> <span class='hs-varop'>++</span> <span class='hs-varid'>tail</span> <span class='hs-varid'>r</span> <span class='hs-layout'>}</span>
<a name="line-99"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>newval</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>max</span> <span class='hs-num'>0</span> <span class='hs-varop'>$</span> <span class='hs-varid'>head</span> <span class='hs-varid'>r</span> <span class='hs-varop'>+</span> <span class='hs-varid'>x</span>
<a name="line-100"></a> <span class='hs-varid'>r</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>drop</span> <span class='hs-varid'>a</span> <span class='hs-varid'>n</span>
<a name="line-101"></a> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>multiColNWin</span> <span class='hs-varid'>l</span>
<a name="line-102"></a> <span class='hs-varid'>ds</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>multiColDeltaSize</span> <span class='hs-varid'>l</span>
<a name="line-103"></a> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>multiColSize</span> <span class='hs-varid'>l</span>
<a name="line-104"></a> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>multiColActive</span> <span class='hs-varid'>l</span>
<a name="line-105"></a> <span class='hs-varid'>description</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-str'>"MultiCol"</span>
<a name="line-106"></a>
<a name="line-107"></a>
<a name="line-108"></a><a name="getCol"></a><span class='hs-comment'>-- | Get which column a window is in, starting at 0.</span>
<a name="line-109"></a><span class='hs-definition'>getCol</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'>Int</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span>
<a name="line-110"></a><span class='hs-definition'>getCol</span> <span class='hs-varid'>w</span> <span class='hs-layout'>(</span><span class='hs-varid'>n</span><span class='hs-conop'>:</span><span class='hs-varid'>ns</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>n</span><span class='hs-varop'><</span><span class='hs-num'>1</span> <span class='hs-varop'>||</span> <span class='hs-varid'>w</span> <span class='hs-varop'><</span> <span class='hs-varid'>n</span>
<a name="line-111"></a> <span class='hs-keyword'>then</span> <span class='hs-num'>0</span>
<a name="line-112"></a> <span class='hs-keyword'>else</span> <span class='hs-num'>1</span> <span class='hs-varop'>+</span> <span class='hs-varid'>getCol</span> <span class='hs-layout'>(</span><span class='hs-varid'>w</span><span class='hs-comment'>-</span><span class='hs-varid'>n</span><span class='hs-layout'>)</span> <span class='hs-varid'>ns</span>
<a name="line-113"></a><span class='hs-comment'>-- Should never occur...</span>
<a name="line-114"></a><span class='hs-definition'>getCol</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-comment'>-</span><span class='hs-num'>1</span>
<a name="line-115"></a>
<a name="line-116"></a><a name="doL"></a><span class='hs-definition'>doL</span> <span class='hs-keyglyph'>::</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'>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-keyglyph'>[</span><span class='hs-conid'>Rectangle</span><span class='hs-keyglyph'>]</span>
<a name="line-117"></a><span class='hs-definition'>doL</span> <span class='hs-varid'>nwin</span> <span class='hs-varid'>s</span> <span class='hs-varid'>r</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>rlist</span>
<a name="line-118"></a> <span class='hs-keyword'>where</span> <span class='hs-comment'>-- Number of columns to tile</span>
<a name="line-119"></a> <span class='hs-varid'>ncol</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>getCol</span> <span class='hs-layout'>(</span><span class='hs-varid'>n</span><span class='hs-comment'>-</span><span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-varid'>nwin</span> <span class='hs-varop'>+</span> <span class='hs-num'>1</span>
<a name="line-120"></a> <span class='hs-comment'>-- Compute the actual size</span>
<a name="line-121"></a> <span class='hs-varid'>size</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>floor</span> <span class='hs-varop'>$</span> <span class='hs-varid'>abs</span> <span class='hs-varid'>s</span> <span class='hs-varop'>*</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-layout'>(</span><span class='hs-varid'>rect_width</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span>
<a name="line-122"></a> <span class='hs-comment'>-- Extract all but last column to tile</span>
<a name="line-123"></a> <span class='hs-varid'>c</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>take</span> <span class='hs-layout'>(</span><span class='hs-varid'>ncol</span><span class='hs-comment'>-</span><span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-varid'>nwin</span>
<a name="line-124"></a> <span class='hs-comment'>-- Compute number of windows in last column and add it to the others</span>
<a name="line-125"></a> <span class='hs-varid'>col</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>c</span> <span class='hs-varop'>++</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>n</span><span class='hs-comment'>-</span><span class='hs-varid'>sum</span> <span class='hs-varid'>c</span><span class='hs-keyglyph'>]</span>
<a name="line-126"></a> <span class='hs-comment'>-- Compute width of columns</span>
<a name="line-127"></a> <span class='hs-varid'>width</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>s</span><span class='hs-varop'>></span><span class='hs-num'>0</span>
<a name="line-128"></a> <span class='hs-keyword'>then</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>ncol</span><span class='hs-varop'>==</span><span class='hs-num'>1</span>
<a name="line-129"></a> <span class='hs-comment'>-- Only one window</span>
<a name="line-130"></a> <span class='hs-keyword'>then</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>fromIntegral</span> <span class='hs-varop'>$</span> <span class='hs-varid'>rect_width</span> <span class='hs-varid'>r</span><span class='hs-keyglyph'>]</span>
<a name="line-131"></a> <span class='hs-comment'>-- Give the master it's space and split the rest equally for the other columns</span>
<a name="line-132"></a> <span class='hs-keyword'>else</span> <span class='hs-varid'>size</span><span class='hs-conop'>:</span><span class='hs-varid'>replicate</span> <span class='hs-layout'>(</span><span class='hs-varid'>ncol</span><span class='hs-comment'>-</span><span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-varid'>fromIntegral</span> <span class='hs-layout'>(</span><span class='hs-varid'>rect_width</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span> <span class='hs-comment'>-</span> <span class='hs-varid'>size</span><span class='hs-layout'>)</span> <span class='hs-varop'>`div`</span> <span class='hs-layout'>(</span><span class='hs-varid'>ncol</span><span class='hs-comment'>-</span><span class='hs-num'>1</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-133"></a> <span class='hs-keyword'>else</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>ncol</span> <span class='hs-varop'>*</span> <span class='hs-varid'>abs</span> <span class='hs-varid'>s</span> <span class='hs-varop'>>=</span> <span class='hs-num'>1</span>
<a name="line-134"></a> <span class='hs-comment'>-- Split equally</span>
<a name="line-135"></a> <span class='hs-keyword'>then</span> <span class='hs-varid'>replicate</span> <span class='hs-varid'>ncol</span> <span class='hs-varop'>$</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-layout'>(</span><span class='hs-varid'>rect_width</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span> <span class='hs-varop'>`div`</span> <span class='hs-varid'>ncol</span>
<a name="line-136"></a> <span class='hs-comment'>-- Let the master cover what is left...</span>
<a name="line-137"></a> <span class='hs-keyword'>else</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromIntegral</span> <span class='hs-layout'>(</span><span class='hs-varid'>rect_width</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span> <span class='hs-comment'>-</span> <span class='hs-layout'>(</span><span class='hs-varid'>ncol</span><span class='hs-comment'>-</span><span class='hs-num'>1</span><span class='hs-layout'>)</span><span class='hs-varop'>*</span><span class='hs-varid'>size</span><span class='hs-layout'>)</span><span class='hs-conop'>:</span><span class='hs-varid'>replicate</span> <span class='hs-layout'>(</span><span class='hs-varid'>ncol</span><span class='hs-comment'>-</span><span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-varid'>size</span>
<a name="line-138"></a> <span class='hs-comment'>-- Compute the horizontal position of columns</span>
<a name="line-139"></a> <span class='hs-varid'>xpos</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>accumEx</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromIntegral</span> <span class='hs-varop'>$</span> <span class='hs-varid'>rect_x</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span> <span class='hs-varid'>width</span>
<a name="line-140"></a> <span class='hs-comment'>-- Exclusive accumulation</span>
<a name="line-141"></a> <span class='hs-varid'>accumEx</span> <span class='hs-varid'>a</span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-conop'>:</span><span class='hs-varid'>xs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>a</span><span class='hs-conop'>:</span><span class='hs-varid'>accumEx</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-varop'>+</span><span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-varid'>xs</span>
<a name="line-142"></a> <span class='hs-varid'>accumEx</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>[]</span>
<a name="line-143"></a> <span class='hs-comment'>-- Create a rectangle for each column</span>
<a name="line-144"></a> <span class='hs-varid'>cr</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>zipWith</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>x</span> <span class='hs-varid'>w</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>r</span> <span class='hs-layout'>{</span> <span class='hs-varid'>rect_x</span><span class='hs-keyglyph'>=</span><span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>x</span><span class='hs-layout'>,</span> <span class='hs-varid'>rect_width</span><span class='hs-keyglyph'>=</span><span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>w</span> <span class='hs-layout'>}</span><span class='hs-layout'>)</span> <span class='hs-varid'>xpos</span> <span class='hs-varid'>width</span>
<a name="line-145"></a> <span class='hs-comment'>-- Split the columns into the windows</span>
<a name="line-146"></a> <span class='hs-varid'>rlist</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>concat</span> <span class='hs-varop'>$</span> <span class='hs-varid'>zipWith</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>num</span> <span class='hs-varid'>rect</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>splitVertically</span> <span class='hs-varid'>num</span> <span class='hs-varid'>rect</span><span class='hs-layout'>)</span> <span class='hs-varid'>col</span> <span class='hs-varid'>cr</span>
</pre></body>
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