From: Matthijs Kooijman <matthijs@stdin.nl>
Date: Mon, 24 Aug 2009 19:20:23 +0000 (+0200)
Subject: Add some comments and type signatures.
X-Git-Url: https://git.stderr.nl/gitweb?a=commitdiff_plain;h=25a54fccc78a8c85e3196428c677e213c1eab23e;p=matthijs%2Fprojects%2Ffpprac.git

Add some comments and type signatures.
---

diff --git a/FPPrac.hs b/FPPrac.hs
index 5da734e..14e8c4f 100644
--- a/FPPrac.hs
+++ b/FPPrac.hs
@@ -236,6 +236,8 @@ transKey _ _ = return ()
 
 -}
 
+-- | Handlers for various requests.
+miscHandler, winHandler, gfxHandler :: IState -> Request -> Maybe (IO ())
 {-
 miscHandler s@IS {..} (FRead  fn     ) = Just $ readFile fn >>= post s . FileContents fn
 miscHandler   IS {..} (FWrite fn cnts) = Just $ writeFile fn cnts
@@ -278,11 +280,16 @@ gfxHandler IS {..} (GfxDisc      col rt)    = Just $ ellipse buffer rt [penColor
 gfxHandler IS {..} (GfxFont      st  sz)    = Just $ buffer `set` [ fontSize := sz, fontFace := st ]
 gfxHandler IS {..} (GfxPicture   fd  pt)    = Just $ bitmapCreateFromFile fd >>= \bm -> drawBitmap buffer bm pt False [] >> bitmapGetSize bm >>= dirtyRect' sPanel pt
 -}
+-- | Helper function for gfxHanlder
+gfxHandler' :: Request -> Maybe (Cairo.Render ())
 gfxHandler' (GfxText col (Point x y) st) = Just $ do
+	-- Set the source color, move to the requested position and draw the
+	-- text
 	setSourceColor col
 	Cairo.moveTo (fromIntegral x) (fromIntegral y)
 	Cairo.showText st 
 gfxHandler' GfxClear = Just $ do
+	-- Set the source to white and paint the entire surface with it
 	Cairo.setSourceRGB 1 1 1
 	Cairo.paint
 gfxHandler' _ = Nothing