Use Gloss for real-time visualization

app/Main.hs

@@ -8,6 +8,8 @@ import Linear.V3
 import System.Random
 import Control.Monad (replicateM)
 
+import Graphics.Gloss hiding (Point)
+
 
 --------------------------------------------------------------------------------
 -- Random body generation
@@ -76,8 +78,36 @@ csvFromInit :: Int -- ^ The number of time steps to keep
   -> String -- ^ CSV data
 csvFromInit n dt theta b = concat $ map (uncurry csvFromBodies) (take n $ steps dt theta b)
 
+
+--------------------------------------------------------------------------------
+-- Gloss
+--------------------------------------------------------------------------------
+
+width, height, offset :: Int
+width = 1000
+height = 750
+offset = 100
+
+window :: Display
+window = InWindow "Orbit" (width, height) (offset, offset)
+
+displayBody :: Body -> Picture
+displayBody b = translate (realToFrac x) (realToFrac y) $ circle (realToFrac (_bodyRadius b))
+  where P (V3 x y _) = _bodyPosition b
+
+displayBodies :: [Body] -> Picture
+displayBodies = color white . Pictures . map displayBody
+
+drawing :: Picture
+drawing = color white $ circle 80
+
 main :: IO ()
 main = do
-  bodies <- replicateM 100 randomBody
-  putStrLn $ csvFromInit 10000 (60*20) 0.5 bodies
-
+  bodies <- replicateM 300 randomBody
+  simulate
+    window
+    black
+    25
+    bodies
+    displayBodies
+    (\_ dt bs -> updateAll (realToFrac dt*1e6) 0.5 bs)