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{-# LANGUAGE ScopedTypeVariables #-}
module Dump
( dumpWorld
, printWorld)
where
import Body
import World
import System.IO
import Data.List
import Text.Printf
import qualified Data.Vector.Unboxed as V
-- | Dump the bodies in a world to a file.
dumpWorld :: World -> FilePath -> IO ()
dumpWorld world filePath
= do h <- openFile filePath WriteMode
mapM_ (hWriteBody h)
$ V.toList
$ worldBodies world
hClose h
-- | Print the bodies in a world to stdout
printWorld :: World -> IO ()
printWorld world
= do mapM_ (hWriteBody stdout)
$ V.toList
$ worldBodies world
-- | Write a single body to a file.
hWriteBody :: Handle -> Body -> IO ()
hWriteBody h ((px, py, mass), (vx, vy), (ax, ay))
= hPutStrLn h
$ concat
$ ( (padRc 8 ' ' $ show mass)
: " "
: (intersperse " "
$ map (\f -> printf "%15.8f" f) [ px, py, vx, vy, ax, ay ]))
-- | Right justify a doc, padding with a given character.
padRc :: Int -> Char -> String -> String
padRc n c str
= replicate (n - length str) c ++ str
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