我有一个模拟社区中许多代理互动的程序。我正在使用Gloss库对交互进行动画处理,代理图片正确呈现,但动画没有呈现出来。我通过生成模拟来实现动画,这是一个相互作用的列表列表,我随后选择与第二个动画对应的列表,并渲染该交互。当将代码输出到终端时,模拟代码运行正常。 以下是代码:
render :: Int -> History -> Picture -- assume window to be square
render size (History int agents) = Pictures $ map (drawAgent (step`div`2) colors step) agents
where step = size*6 `div` (length agents)
--agents = nub $ concat $ map (\(Interaction a1 a2 _ ) -> [a1,a2]) int
nubNames = nub $ map (getName . name) agents --ignore the first two letters of name
colors = Map.fromList $ zipWith (\name color-> (name, color)) nubNames (cycle colorlist)
colorlist = [red,green,blue,yellow,cyan,magenta,rose,violet,azure,aquamarine,chartreuse,orange]
drawAgent :: Int -> Map.Map String Color -> Int -> Agent -> Picture
drawAgent size colors step agent =
color aColor (Polygon [(posA,posB),(posA,negB),(negA,negB),(negA,posB)])
where aColor = fromMaybe black $ Map.lookup (getName $ name agent ) colors
a = (fst $ position agent) * step
b = (snd $ position agent) * step
posA = fromIntegral $ a+size
negA = fromIntegral $ a-size
posB = fromIntegral $ b+size
negB = fromIntegral $ b-size
simulate :: Int -> [Agent] -> [History]
simulate len agents = trace ("simulation"
(playRound agents len) :
simulate len (reproduce (playRound agents len))
main = do
a <- getStdGen
G.animate (G.InWindow "My Window" (400, 400) (0,0)) G.white
(\time ->(render 400) $ ((simulate 5 (agent a))!!(floor time)))
where agent a = generate a 9
sim a = simulate 40 (agent a)
当我执行这个命令时,它会显示模拟正在运行,但只会渲染第一个交互。
$ ghc -O2 -threaded main.hs && ./main
[6 of 8] Compiling Prisoners ( Prisoners.hs, Prisoners.o )
Linking main ...
simulation
simulation
simulation
这将一直持续下去,直到我停止它,每次呈现相同的图片。我做错了什么?