From 4866f2e367dfcf22a9591231ba40948826a1b438 Mon Sep 17 00:00:00 2001
From: Spencer Janssen <sjanssen@cse.unl.edu>
Date: Thu, 1 Nov 2007 21:10:59 +0100
Subject: Hierarchify

darcs-hash:20071101201059-a5988-fc1f1262bec1b69e13ba18ae7cefeafc8c4471d4.gz
---
 XMonad/Layout/Circle.hs | 70 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 70 insertions(+)
 create mode 100644 XMonad/Layout/Circle.hs

(limited to 'XMonad/Layout/Circle.hs')

diff --git a/XMonad/Layout/Circle.hs b/XMonad/Layout/Circle.hs
new file mode 100644
index 0000000..2d85dfc
--- /dev/null
+++ b/XMonad/Layout/Circle.hs
@@ -0,0 +1,70 @@
+{-# LANGUAGE FlexibleInstances, MultiParamTypeClasses, TypeSynonymInstances #-}
+
+-----------------------------------------------------------------------------
+-- |
+-- Module      :  XMonad.Layout.Circle
+-- Copyright   :  (c) Peter De Wachter
+-- License     :  BSD-style (see LICENSE)
+--
+-- Maintainer  :  Peter De Wachter <pdewacht@gmail.com>
+-- Stability   :  unstable
+-- Portability :  unportable
+--
+-- Circle is an elliptical, overlapping layout, by Peter De Wachter
+--
+-----------------------------------------------------------------------------
+
+module XMonad.Layout.Circle (
+                             -- * Usage
+                             -- $usage
+                             Circle (..)
+                            ) where -- actually it's an ellipse
+
+import Data.List
+import Graphics.X11.Xlib
+import XMonad
+import XMonad.StackSet (integrate, peek)
+
+-- $usage
+-- You can use this module with the following in your Config.hs file:
+--
+-- > import XMonad.Layout.Circle
+-- > layouts = [ Layout Circle ]
+
+-- %import XMonad.Layout.Circle
+
+data Circle a = Circle deriving ( Read, Show )
+
+instance LayoutClass Circle Window where
+    doLayout Circle r s = do layout <- raiseFocus $ circleLayout r $ integrate s
+                             return (layout, Nothing)
+
+circleLayout :: Rectangle -> [a] -> [(a, Rectangle)]
+circleLayout _ []     = []
+circleLayout r (w:ws) = master : rest
+    where master = (w, center r)
+          rest   = zip ws $ map (satellite r) [0, pi * 2 / fromIntegral (length ws) ..]
+
+raiseFocus :: [(Window, Rectangle)] -> X [(Window, Rectangle)]
+raiseFocus xs = do focused <- withWindowSet (return . peek)
+                   return $ case find ((== focused) . Just . fst) xs of
+                              Just x  -> x : delete x xs
+                              Nothing -> xs
+
+center :: Rectangle -> Rectangle
+center (Rectangle sx sy sw sh) = Rectangle x y w h
+    where s = sqrt 2 :: Double
+          w = round (fromIntegral sw / s)
+          h = round (fromIntegral sh / s)
+          x = sx + fromIntegral (sw - w) `div` 2
+          y = sy + fromIntegral (sh - h) `div` 2
+
+satellite :: Rectangle -> Double -> Rectangle
+satellite (Rectangle sx sy sw sh) a = Rectangle (sx + round (rx + rx * cos a))
+                                                (sy + round (ry + ry * sin a))
+                                                w h
+    where rx = fromIntegral (sw - w) / 2
+          ry = fromIntegral (sh - h) / 2
+          w = sw * 10 `div` 25
+          h = sh * 10 `div` 25
+
-- 
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