now using built-in timing facilities

examples/example00.hs

@@ -32,7 +32,10 @@ main = do
     }
   withAffection conf
 
-type UserData = M.Map String G.GeglNode
+data UserData = UserData
+  { nodeGraph   :: M.Map String G.GeglNode
+  , elapsedTime :: Double
+  }
 
 load :: SDL.Surface -> IO UserData
 load _ = do
@@ -49,12 +52,16 @@ load _ = do
     , ("checkerboard", checkerboard)
     ]
   traceM "loading complete"
-  return myMap
+  return $ UserData
+    { nodeGraph = myMap
+    , elapsedTime = 0
+    }
 
 draw :: AffectionState (AffectionData UserData) IO ()
 draw = do
   traceM "drawing"
   AffectionData{..} <- get
+  let UserData{..} = userState
   liftIO $ SDL.lockSurface drawSurface
   pixels <- liftIO $ SDL.surfacePixels drawSurface
   let SDL.Surface rawSurfacePtr _ = drawSurface
@@ -64,7 +71,7 @@ draw = do
   SDL.V2 (CInt rw) (CInt rh) <- SDL.surfaceDimensions drawSurface
   let (w, h) = (fromIntegral rw, fromIntegral rh)
   liftIO $ G.gegl_node_blit
-    (userState M.! "checkerboard" :: G.GeglNode)
+    (nodeGraph M.! "checkerboard" :: G.GeglNode)
     1
     (G.GeglRectangle 0 0 w h)
     format
@@ -77,9 +84,18 @@ draw = do
 update :: Double -> AffectionState (AffectionData UserData) IO ()
 update sec = do
   traceM "updating"
-  -- traceM $ show sec
-  liftIO $ delaySec 5
-  ud@AffectionData{..} <- get
-  put $ ud
+  -- liftIO $ delaySec 5
+  ad@AffectionData{..} <- get
+  let ud@UserData{..} = userState
+  traceM $ show elapsedTime
+  if elapsedTime < 5
+  then
+    put $ ad
+      { userState = ud
+        { elapsedTime = elapsedTime + sec
+        }
+      }
+  else
+    put $ ad
       { quitEvent = True
       }