Got rid of pure functional randomness and started using IO monad

3 files changed, 42 insertions, 40 deletions

@@ -8,30 +8,30 @@ module Fallen.Map.Overworld
   import Fallen.Point
   
   -- initOverworld : generate the overworld
-  initOverworld rg = do
+  initOverworld = do
     let m = emptyMap 150 150 Forest -- create map
-    let m' = fillMapRect 0 0 150 150 Grass m -- fill with grass
-    let (tr,rg1) = randomR (1,50) rg :: (Int,StdGen)
-    let (lr,rg2) = randomR (1,50) rg1 :: (Int,StdGen)
-    let (rr,rg3) = randomR (1,50) rg2 :: (Int,StdGen)
-    let (br,rg4) = randomR (1,50) rg3 :: (Int,StdGen)
-    let (m'',rg5) = roughen 150 tr lr rr br rg4 m' -- add surrounding forest
-    let (clumps,rg6) = randomR (30,60) rg5 :: (Int,StdGen)
-    let (m2,rg7) = drawClumps clumps rg6 m''
-    (m2,rg7)
+    let m1 = fillMapRect 0 0 150 150 Grass m -- fill with grass
+    tr <- randomRIO (1,50)
+    lr <- randomRIO (1,50)
+    rr <- randomRIO (1,50)
+    br <- randomRIO (1,50)
+    m2 <- roughen 150 tr lr rr br m1 -- add surrounding forest
+    clumps <- randomRIO (30,60)
+    m3 <- drawClumps clumps m2
+    return m3
   
   -- roughen : create the rough forest edges of the overworld
-  roughen 0 _ _ _ _ rg m = (m,rg)
-  roughen w tr lr rr br rg m = do
-          let m' = fillMapRect (w-1) 0 1 tr Forest m
-          let m'' = fillMapRect 0 (w-1) lr 1 Forest m'
-          let m2 = fillMapRect (150-rr-1) (w-1) rr 1 Forest m''
-          let m2' = fillMapRect (w-1) (150-br-1) 1 br Forest m2
-          let (str,rg1) = randomR (-2,2) rg :: (Int,StdGen)
-          let (slr,rg2) = randomR (-2,2) rg1 :: (Int,StdGen)
-          let (srr,rg3) = randomR (-2,2) rg2 :: (Int,StdGen)
-          let (sbr,rg4) = randomR (-2,2) rg3 :: (Int,StdGen)
-          roughen (w-1) (bound tr str) (bound lr slr) (bound rr srr) (bound br sbr) rg4 m2' where
+  roughen 0 _ _ _ _ m = return m
+  roughen w tr lr rr br m = do
+    let m1 = fillMapRect (w-1) 0 1 tr Forest m
+    let m2 = fillMapRect 0 (w-1) lr 1 Forest m1
+    let m3 = fillMapRect (150-rr-1) (w-1) rr 1 Forest m2
+    let m4 = fillMapRect (w-1) (150-br-1) 1 br Forest m3
+    str <- randomRIO (-2,2)
+    slr <- randomRIO (-2,2)
+    srr <- randomRIO (-2,2)
+    sbr <- randomRIO (-2,2)
+    roughen (w-1) (bound tr str) (bound lr slr) (bound rr srr) (bound br sbr) m4 where
       bound r s
         | r + s < 1 = 1
         | r + s > 50 = 50
@@ -40,20 +40,22 @@ module Fallen.Map.Overworld
   -- drawClumps : add in clumps of rocks, water, and trees
   clumpTypes = [Rock, Water, Forest]
   clumpOver = [Rock, Water, Forest, Grass]
-  drawClumps 0 rg m = (m,rg)
-  drawClumps num rg m = do
-    let (area,rg1) = randomR (1,300) rg :: (Int,StdGen)
-    let (clumpType,rg2) = randomSetElement rg1 clumpTypes
-    let (startPoint,rg3) = randomPoint 0 0 149 149 rg2
-    let (m',rg4) = drawClump area clumpType startPoint m rg3
-    drawClumps (num-1) rg4 m'
-  drawClump 0 clumpType p m rg = (updateMap p clumpType m,rg)
-  drawClump area clumpType p m rg = do
+  drawClumps :: Int -> Map -> IO Map
+  drawClumps 0 m = return m
+  drawClumps num m = do
+    area <- randomRIO (1,300)
+    clumpType <- randomSetElement clumpTypes
+    startPoint <- randomPoint 0 0 149 149
+    m' <- drawClump area clumpType startPoint m
+    drawClumps (num-1) m'
+  drawClump :: Int -> Tile -> Point -> Map -> IO Map
+  drawClump 0 clumpType p m = return $ updateMap p clumpType m
+  drawClump area clumpType p m = do
     let m' = updateMap p clumpType m
     let legalDirs = legalMoves m' p clumpOver
     if null legalDirs
-      then (m',rg)
+      then return m'
       else do
-        let (nextDir,rg1) = randomSetElement rg legalDirs
+        nextDir <- randomSetElement legalDirs
         let nextPoint = stepInDirection p nextDir
-        drawClump (area-1) clumpType nextPoint m' rg1
\ No newline at end of file
+        drawClump (area-1) clumpType nextPoint m'
\ No newline at end of file
@@ -34,10 +34,10 @@ module Fallen.Point
     West -> East
   
   -- randomPoint :: Int -> Int -> Int -> Int -> IO Point
-  randomPoint minX minY maxX maxY rg = do
-    let (x,rg1) = randomR (minX, maxX) rg :: (Int,StdGen)
-    let (y,rg2) = randomR (minY, maxY) rg1  :: (Int,StdGen)
-    ((x,y),rg2)
+  randomPoint minX minY maxX maxY = do
+    x <- randomRIO (minX, maxX)
+    y <- randomRIO (minY, maxY)
+    return (x,y)
   
   -- dirToPoint :: Point -> Point -> [Direction]
   dirToPoint p1 p2 = horizDirToPoint p1 p2 ++ vertDirToPoint p1 p2 where
@@ -3,6 +3,6 @@ module Fallen.Util
 ) where
   import System.Random
   
-  randomSetElement rg set = do
-    let (index,rg') = randomR (0,length set - 1) rg :: (Int,StdGen)
-    (set !! index, rg')
\ No newline at end of file
+  randomSetElement set = do
+    index <- randomRIO (0, length set - 1)
+    return $ set !! index
\ No newline at end of file