Tell GraphViz to use round nodes.

app/Main.hs

@@ -18,10 +18,10 @@ import Icons
 import Rendering
 
 -- todo: Find out how to hide unqualified names such that recursive drawings are connected correctly
+-- todo: Find out and fix why connectinos to sub-icons need to be qualified twice (eg. "lam0" .> "arg" .> "arg")
 -- todo: Rotate based on difference from ideal tangent angle, not line distance.
 -- todo: layout and rotate considering external connections.
 -- todo: add port to bottom of guard.
--- todo: give GraphViz square or circular icons such that rotation can not cause icons to inersect.
 -- todo: use constants for icon name strings in Main
 -- todo: figure out local vs. global icon positions
 
@@ -78,7 +78,8 @@ superEdges =
   iconToIcon "y" "lam0",
   iconToIcon "z" "lam0",
   iconToIcon "q" "lam0",
-  iconToIcon "A" "z"
+  iconToIcon "A" "z",
+  iconToPort ("lam0" .> "foo" .> "foo") "lam0" 0
   ]
 
 superIcons = toNames [
@@ -120,7 +121,7 @@ super3Edges =
 d1Name = toName "d1"
 super3Drawing = Drawing super3Icons super2Edges [(d1Name, super2Drawing)]
 
-factIcons = toNames
+fact0Icons = toNames
   [
   ("g0", GuardIcon 2),
   ("one", TextBoxIcon "1"),
@@ -136,7 +137,7 @@ factIcons = toNames
   ("res", ResultIcon)
   ]
 
-factEdges = [
+fact0Edges = [
     iconToPort "eq0" "eq0Ap" 0,
     portToPort "eq0Ap" 2 "g0" 1,
     iconToPort "-1" "-1Ap" 0,
@@ -152,7 +153,22 @@ factEdges = [
     iconToPort "res" "g0" 0
   ]
 
-factDrawing = Drawing factIcons factEdges []
+fact0Drawing = Drawing fact0Icons fact0Edges []
+fact0Name = toName "fac0"
+
+factLam0Icons = toNames [
+  ("lam0", LambdaRegionIcon 1 fact0Name),
+  ("fac", TextBoxIcon "factorial")
+  ]
+
+factLam0Edges = [
+  iconToPort ("lam0" .> "arg" .> "arg") "lam0" 0,
+  iconToPort "lam0" ("lam0" .> "recurAp") 0,
+  --portToPort "lam0" 0 ("lam0" .> "*Ap2") 3,
+  iconToIcon "lam0" "fac"
+  ]
+
+factLam0Drawing = Drawing factLam0Icons factLam0Edges [(fact0Name, fact0Drawing)]
 
 -- This is left commented out for a future test of the manual connect functions.
 -- connectNodes g =
@@ -164,7 +180,7 @@ factDrawing = Drawing factIcons factEdges []
 
 main1 :: IO ()
 main1 = do
-  placedNodes <- renderDrawing factDrawing
+  placedNodes <- renderDrawing factLam0Drawing
   mainWith (placedNodes # bgFrame 0.1 black)
 
 main2 = mainWith (guardIcon 3 # bgFrame 0.1 black)

app/Rendering.hs

@@ -16,7 +16,6 @@ import Diagrams.Backend.SVG(B)
 import Data.GraphViz
 import qualified Data.GraphViz.Attributes.Complete as GVA
 --import Data.GraphViz.Commands
-import Data.Map((!))
 import qualified Data.Map as Map
 import Data.Maybe(fromMaybe, isJust)
 import qualified Debug.Trace
@@ -68,7 +67,7 @@ makeConnections edges = applyAll connections
 connectedPorts :: [Edge] -> Name -> [(Int, Name, Maybe Int)]
 connectedPorts edges name = map edgeToPort $ filter nameInEdge edges
   where
-    nameInEdge (n1, p1, n2, p2) = (name == n1 && (isJust p1)) || (name == n2 && (isJust p2))
+    nameInEdge (n1, p1, n2, p2) = (name == n1 && isJust p1) || (name == n2 && isJust p2)
     edgeToPort (n1, p1, n2, p2) =
       if name == n1
         then (fromMaybe (error "connectedPorts port is Nothing") p1, n2, p2)
@@ -99,9 +98,9 @@ angleWithMinDist myLocation edges =
     totalLength angle = (angle, totalLenghtOfLines angle myLocation edges)
 
 -- constant
-scaleFactor = 0.025
+scaleFactor = 0.02
 
-getFromMapAndScale posMap name = scaleFactor *^ (posMap ! name)
+getFromMapAndScale posMap name = scaleFactor *^ (posMap Map.! name)
 
 -- | rotateNodes rotates the nodes such that the distance of its connecting lines
 -- are minimized.
@@ -138,14 +137,18 @@ placeNodes layoutResult nameDiagramMap edges = mconcat placedNodes
     placedNodes = map placeNode rotatedNameDiagramMap
     --placedNodes = map placeNode nameDiagramMap
     -- todo: Not sure if the diagrams should already be centered at this point.
-    placeNode (name, diagram) = place (diagram # centerXY) (scaleFactor *^ (positionMap ! name))
+    placeNode (name, diagram) = place (diagram # centerXY) (scaleFactor *^ (positionMap Map.! name))
 
 doGraphLayout graph nameDiagramMap connectNodes edges = do
   layoutResult <- layoutGraph' layoutParams Neato graph
   return $ placeNodes layoutResult nameDiagramMap edges # connectNodes
   where
     layoutParams :: GraphvizParams Int v e () v
-    layoutParams = defaultDiaParams{
+    layoutParams = defaultParams{
+      globalAttributes =
+        [ NodeAttrs [shape Circle]
+        , GraphAttrs [GVA.Overlap GVA.ScaleXYOverlaps]
+        ],
       fmtEdge = const [arrowTo noArrow],
       fmtNode = nodeAttribute
       }
@@ -153,9 +156,10 @@ doGraphLayout graph nameDiagramMap connectNodes edges = do
     nodeAttribute (nodeInt, _) =
       -- todo: Potential bug. GVA.Width and GVA.Height have a minimum of 0.01
       -- throw an error if the width or height are less than 0.01
-      [GVA.Shape BoxShape, GVA.Width (width dia), GVA.Height (height dia)]
+      [GVA.Width shapeDimensions, GVA.Height shapeDimensions]
       where
-        --todo: Hack!!! Using (!!) here relies upon the implementation of Diagrams.TwoD.GraphViz.mkGraph
+        shapeDimensions = max (width dia) (height dia)
+        --todo: Hack! Using (!!) here relies upon the implementation of Diagrams.TwoD.GraphViz.mkGraph
         -- to name the nodes in order
         (_, dia) = nameDiagramMap !! nodeInt