From 6bdffaf86341d118a965f7316c7141baea58d87c Mon Sep 17 00:00:00 2001
From: Joe Crayne <joe@jerkface.net>
Date: Thu, 18 Jul 2019 17:22:32 -0400
Subject: meshsketch: key-stroke to toggle whirling camera animation.

---
 MeshSketch.hs | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/MeshSketch.hs b/MeshSketch.hs
index d9290fd..56bbdaa 100644
--- a/MeshSketch.hs
+++ b/MeshSketch.hs
@@ -101,6 +101,7 @@ ringPointAttr ('r':'p':c:cs) = toLower c : cs
 -- State created by uploadState.
 data State = State
     { stAnimator     :: Animator
+    , stWhirl        :: IORef (Maybe Int)
     , stCamera       :: IORef Camera
     , stFullscreen   :: IO ()
     , stSkyboxes     :: Skyboxes
@@ -212,8 +213,10 @@ initializeState mm storage = do
     plane <- newIORef $ Just (xzPlaneVector G.// [(3,-1)])
     recentPts <- newIORef Give0
     angle <- newIORef 0
+    whirl <- newIORef Nothing
     let st = State
             { stAnimator     = tm
+            , stWhirl        = whirl
             , stCamera       = cam
             , stFullscreen   = toggle
             , stSkyboxes     = skyboxes
@@ -232,7 +235,6 @@ initializeState mm storage = do
             , stObjects      = objsRef
             , stMasks        = masksRef
             }
-    -- _ <- addAnimation tm (whirlingCamera st)
     return st
 
 destroyState :: GLArea -> State -> IO ()
@@ -906,6 +908,13 @@ onEvent mm realized ev = do
                 KEY_F -> do
                     put 'F'
                     stFullscreen st
+                KEY_A -> do
+                    mw <- readIORef (stWhirl st)
+                    case mw of
+                        Just w -> do removeAnimation (stAnimator st) w
+                                     writeIORef (stWhirl st) Nothing
+                        Nothing -> do w <- addAnimation (stAnimator st) (whirlingCamera st)
+                                      writeIORef (stWhirl st) (Just w)
                 _ -> return ()
 
         e -> return ()
-- 
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