diff --git a/dot-to-dot b/dot-to-dot
index 1e3f27b..f392f5b 100755
Binary files a/dot-to-dot and b/dot-to-dot differ
diff --git a/dot-to-dot.mlb b/dot-to-dot.mlb
index 7f51bfe..56c2ac2 100644
--- a/dot-to-dot.mlb
+++ b/dot-to-dot.mlb
@@ -11,12 +11,12 @@ in
 end
 
 functional-core/app-type.sml
-imperative-shell/constants.sml
 
 ann
   "allowVectorExps true"
 in
-  imperative-shell/app-draw.sml
+  imperative-shell/constants.sml
 end
+imperative-shell/app-draw.sml
 
 imperative-shell/shell.sml
diff --git a/functional-core/app-type.sml b/functional-core/app-type.sml
index ecb7524..1cf2e9f 100644
--- a/functional-core/app-type.sml
+++ b/functional-core/app-type.sml
@@ -35,7 +35,7 @@ struct
       | [] => acc
   in
     fun getTrianglesVector (app: app_type) =
-      let val lst = helpGetTrianglseVector (#triangles app, [])
+      let val lst = helpGetTrianglesVector (#triangles app, [])
       in Vector.concat lst
       end
   end
diff --git a/imperative-shell/app-draw.sml b/imperative-shell/app-draw.sml
index fc4cc9a..bafdc20 100644
--- a/imperative-shell/app-draw.sml
+++ b/imperative-shell/app-draw.sml
@@ -1,10 +1,9 @@
-structure AppDraw = 
+structure AppDraw =
 struct
   type draw_object =
     { vertexBuffer: Word32.word
     , vertexShader: Word32.word
     , fragmentBuffer: Word32.word
-    , fragmentBuffer: Word32.word
     , fragmentShader: Word32.word
     , program: Word32.word
     }
@@ -18,8 +17,7 @@ struct
 
       val fragmentBuffer = Gles3.createBuffer ()
       val fragmentShader = Gles3.createShader (Gles3.FRAGMENT_SHADER ())
-      val _ = Gles3.shaderSource
-        (fragmentShader, fragmentShaderString)
+      val _ = Gles3.shaderSource (fragmentShader, fragmentShaderString)
       val _ = Gles3.compileShader fragmentShader
 
       val program = Gles3.createProgram ()
@@ -35,708 +33,32 @@ struct
       }
     end
 
-  val graphLines = 
-    #[
-      (* x = ~0.95 *)
-      ~0.949, ~1.0,
-      ~0.951, ~1.0,
-      ~0.951, 1.0,
-
-      ~0.951, 1.0,
-      ~0.949, 1.0,
-      ~0.949, ~1.0,
-
-      (* x = ~0.9 *)
-      ~0.898, ~1.0,
-      ~0.902, ~1.0,
-      ~0.902, 1.0,
-
-      ~0.902, 1.0,
-      ~0.898, 1.0,
-      ~0.898, ~1.0,
-
-      (* x = ~0.85 *)
-      ~0.849, ~1.0,
-      ~0.851, ~1.0,
-      ~0.851, 1.0,
-
-      ~0.851, 1.0,
-      ~0.849, 1.0,
-      ~0.849, ~1.0,
-
-      (* x = ~0.8 *)
-      ~0.798, ~1.0,
-      ~0.802, ~1.0,
-      ~0.802, 1.0,
-
-      ~0.802, 1.0,
-      ~0.798, 1.0,
-      ~0.798, ~1.0,
-
-      (* x = ~0.75 *)
-      ~0.749, ~1.0,
-      ~0.751, ~1.0,
-      ~0.751, 1.0,
-
-      ~0.751, 1.0,
-      ~0.749, 1.0,
-      ~0.749, ~1.0,
-
-      (* x = ~0.7 *)
-      ~0.698, ~1.0,
-      ~0.702, ~1.0,
-      ~0.702, 1.0,
-
-      ~0.702, 1.0,
-      ~0.698, 1.0,
-      ~0.698, ~1.0,
-
-      (* x = ~0.65 *)
-      ~0.649, ~1.0,
-      ~0.651, ~1.0,
-      ~0.651, 1.0,
-
-      ~0.651, 1.0,
-      ~0.649, 1.0,
-      ~0.649, ~1.0,
-
-      (* x = ~0.6 *)
-      ~0.598, ~1.0,
-      ~0.602, ~1.0,
-      ~0.602, 1.0,
-
-      ~0.602, 1.0,
-      ~0.598, 1.0,
-      ~0.598, ~1.0,
-
-      (* x = ~0.55 *)
-      ~0.549, ~1.0,
-      ~0.551, ~1.0,
-      ~0.551, 1.0,
-
-      ~0.551, 1.0,
-      ~0.549, 1.0,
-      ~0.549, ~1.0,
-
-      (* x = ~0.5 *)
-      ~0.498, ~1.0,
-      ~0.502, ~1.0,
-      ~0.502, 1.0,
-
-      ~0.502, 1.0,
-      ~0.498, 1.0,
-      ~0.498, ~1.0,
-
-      (* x = ~0.45 *)
-      ~0.449, ~1.0,
-      ~0.451, ~1.0,
-      ~0.451, 1.0,
-
-      ~0.451, 1.0,
-      ~0.449, 1.0,
-      ~0.449, ~1.0,
-
-      (* x = ~0.4 *)
-      ~0.398, ~1.0,
-      ~0.402, ~1.0,
-      ~0.402, 1.0,
-
-      ~0.402, 1.0,
-      ~0.398, 1.0,
-      ~0.398, ~1.0,
-
-      (* x = ~0.35 *)
-      ~0.349, ~1.0,
-      ~0.351, ~1.0,
-      ~0.351, 1.0,
-
-      ~0.351, 1.0,
-      ~0.349, 1.0,
-      ~0.349, ~1.0,
-
-      (* x = ~0.3 *)
-      ~0.298, ~1.0,
-      ~0.302, ~1.0,
-      ~0.302, 1.0,
-
-      ~0.302, 1.0,
-      ~0.298, 1.0,
-      ~0.298, ~1.0,
-
-      (* x = ~0.25 *)
-      ~0.249, ~1.0,
-      ~0.251, ~1.0,
-      ~0.251, 1.0,
-
-      ~0.251, 1.0,
-      ~0.249, 1.0,
-      ~0.249, ~1.0,
-
-      (* x = ~0.2 *)
-      ~0.198, ~1.0,
-      ~0.202, ~1.0,
-      ~0.202, 1.0,
-
-      ~0.202, 1.0,
-      ~0.198, 1.0,
-      ~0.198, ~1.0,
-
-      (* x = ~0.15 *)
-      ~0.149, ~1.0,
-      ~0.151, ~1.0,
-      ~0.151, 1.0,
-
-      ~0.151, 1.0,
-      ~0.149, 1.0,
-      ~0.149, ~1.0,
-
-      (* x = ~0.1 *)
-      ~0.098, ~1.0,
-      ~0.102, ~1.0,
-      ~0.102, 1.0,
-
-      ~0.102, 1.0,
-      ~0.098, 1.0,
-      ~0.098, ~1.0,
-
-      (* x = ~0.05 *)
-      ~0.049, ~1.0,
-      ~0.051, ~1.0,
-      ~0.051, 1.0,
-
-      ~0.051, 1.0,
-      ~0.049, 1.0,
-      ~0.049, ~1.0,
-
-      (* x = 0.0 *)
-      ~0.002, ~1.0,
-      0.002, ~1.0,
-      0.002, 1.0,
-
-      0.002, 1.0,
-      ~0.002, 1.0,
-      ~0.002, ~1.0,
-
-      (* x = 0.05 *)
-      0.049, ~1.0,
-      0.051, ~1.0,
-      0.051, 1.0,
-
-      0.051, 1.0,
-      0.049, 1.0,
-      0.049, ~1.0,
-
-      (* x = 0.0 *)
-      0.098, ~1.0,
-      0.102, ~1.0,
-      0.102, 1.0,
-
-      0.102, 1.0,
-      0.098, 1.0,
-      0.098, ~1.0,
-
-      (* x = 0.15 *)
-      0.149, ~1.0,
-      0.151, ~1.0,
-      0.151, 1.0,
-
-      0.151, 1.0,
-      0.149, 1.0,
-      0.149, ~1.0,
-
-      (* x = 0.2 *)
-      0.198, ~1.0,
-      0.202, ~1.0,
-      0.202, 1.0,
-
-      0.202, 1.0,
-      0.198, 1.0,
-      0.198, ~1.0,
-
-      (* x = 0.25 *)
-      0.249, ~1.0,
-      0.251, ~1.0,
-      0.251, 1.0,
-
-      0.251, 1.0,
-      0.249, 1.0,
-      0.249, ~1.0,
-
-      (* x = 0.3 *)
-      0.298, ~1.0,
-      0.302, ~1.0,
-      0.302, 1.0,
-
-      0.302, 1.0,
-      0.298, 1.0,
-      0.298, ~1.0,
-
-      (* x = 0.35 *)
-      0.349, ~1.0,
-      0.351, ~1.0,
-      0.351, 1.0,
-
-      0.351, 1.0,
-      0.349, 1.0,
-      0.349, ~1.0,
-
-      (* x = 0.4 *)
-      0.398, ~1.0,
-      0.402, ~1.0,
-      0.402, 1.0,
-
-      0.402, 1.0,
-      0.398, 1.0,
-      0.398, ~1.0,
-
-      (* x = 0.45 *)
-      0.449, ~1.0,
-      0.451, ~1.0,
-      0.451, 1.0,
-
-      0.451, 1.0,
-      0.449, 1.0,
-      0.449, ~1.0,
-
-      (* x = 0.5 *)
-      0.498, ~1.0,
-      0.502, ~1.0,
-      0.502, 1.0,
-
-      0.502, 1.0,
-      0.498, 1.0,
-      0.498, ~1.0,
-
-      (* x = 0.55 *)
-      0.549, ~1.0,
-      0.551, ~1.0,
-      0.551, 1.0,
-
-      0.551, 1.0,
-      0.549, 1.0,
-      0.549, ~1.0,
-
-      (* x = 0.6 *)
-      0.598, ~1.0,
-      0.602, ~1.0,
-      0.602, 1.0,
-
-      0.602, 1.0,
-      0.598, 1.0,
-      0.598, ~1.0,
-
-      (* x = 0.65 *)
-      0.649, ~1.0,
-      0.651, ~1.0,
-      0.651, 1.0,
-
-      0.651, 1.0,
-      0.649, 1.0,
-      0.649, ~1.0,
-
-      (* x = 0.7 *)
-      0.698, ~1.0,
-      0.702, ~1.0,
-      0.702, 1.0,
-
-      0.702, 1.0,
-      0.698, 1.0,
-      0.698, ~1.0,
-
-      (* x = 0.75 *)
-      0.749, ~1.0,
-      0.751, ~1.0,
-      0.751, 1.0,
-
-      0.751, 1.0,
-      0.749, 1.0,
-      0.749, ~1.0,
-
-      (* x = 0.8 *)
-      0.798, ~1.0,
-      0.802, ~1.0,
-      0.802, 1.0,
-
-      0.802, 1.0,
-      0.798, 1.0,
-      0.798, ~1.0,
-
-      (* x = 0.85 *)
-      0.849, ~1.0,
-      0.851, ~1.0,
-      0.851, 1.0,
-
-      0.851, 1.0,
-      0.849, 1.0,
-      0.849, ~1.0,
-
-      (* x = 0.9 *)
-      0.898, ~1.0,
-      0.902, ~1.0,
-      0.902, 1.0,
-
-      0.902, 1.0,
-      0.898, 1.0,
-      0.898, ~1.0,
-
-      (* x = 0.95 *)
-      0.949, ~1.0,
-      0.951, ~1.0,
-      0.951, 1.0,
-
-      0.951, 1.0,
-      0.949, 1.0,
-      0.949, ~1.0,
-
-      (* y = ~0.95 *)
-      ~1.0, ~0.949,
-      ~1.0, ~0.951,
-      1.0, ~0.951, 
-
-      1.0, ~0.951,
-      1.0, ~0.949,
-      ~1.0, ~0.949,
-
-      (* y = ~0.9 *)
-      ~1.0, ~0.898, 
-      ~1.0, ~0.902, 
-      1.0, ~0.902, 
-
-      1.0, ~0.902, 
-      1.0, ~0.898, 
-      ~1.0, ~0.898, 
-
-      (* y = ~0.85 *)
-      ~1.0, ~0.849, 
-      ~1.0, ~0.851, 
-      1.0, ~0.851, 
-
-      1.0, ~0.851, 
-      1.0, ~0.849, 
-      ~1.0, ~0.849, 
-
-      (* y = ~0.8 *)
-      ~1.0, ~0.798, 
-      ~1.0, ~0.802, 
-      1.0, ~0.802, 
-
-      1.0, ~0.802, 
-      1.0, ~0.798, 
-      ~1.0, ~0.798, 
-
-      (* y = ~0.75 *)
-      ~1.0, ~0.749, 
-      ~1.0, ~0.751, 
-      1.0, ~0.751, 
-
-      1.0, ~0.751, 
-      1.0, ~0.749, 
-      ~1.0, ~0.749, 
-
-      (* y = ~0.7 *)
-      ~1.0, ~0.698, 
-      ~1.0, ~0.702, 
-      1.0, ~0.702, 
-
-      1.0, ~0.702, 
-      1.0, ~0.698, 
-      ~1.0, ~0.698, 
-
-      (* y = ~0.65 *)
-      ~1.0, ~0.649, 
-      ~1.0, ~0.651, 
-      1.0, ~0.651, 
-
-      1.0, ~0.651, 
-      1.0, ~0.649, 
-      ~1.0, ~0.649, 
-
-      (* y = ~0.6 *)
-      ~1.0, ~0.598, 
-      ~1.0, ~0.602, 
-      1.0, ~0.602, 
-
-      1.0, ~0.602, 
-      1.0, ~0.598, 
-      ~1.0, ~0.598, 
-
-      (* y = ~0.55 *)
-      ~1.0, ~0.549, 
-      ~1.0, ~0.551, 
-      1.0, ~0.551, 
-
-      1.0, ~0.551, 
-      1.0, ~0.549, 
-      ~1.0, ~0.549, 
-
-      (* y = ~0.5 *)
-      ~1.0, ~0.498, 
-      ~1.0, ~0.502, 
-      1.0, ~0.502, 
-
-      1.0, ~0.502, 
-      1.0, ~0.498, 
-      ~1.0, ~0.498, 
-
-      (* y = ~0.45 *)
-      ~1.0, ~0.449, 
-      ~1.0, ~0.451, 
-      1.0, ~0.451, 
-
-      1.0, ~0.451, 
-      1.0, ~0.449, 
-      ~1.0, ~0.449, 
-
-      (* y = ~0.4 *)
-      ~1.0, ~0.398, 
-      ~1.0, ~0.402, 
-      1.0, ~0.402, 
-
-      1.0, ~0.402, 
-      1.0, ~0.398, 
-      ~1.0, ~0.398, 
-
-      (* y = ~0.35 *)
-      ~1.0, ~0.349, 
-      ~1.0, ~0.351, 
-      1.0, ~0.351, 
-
-      1.0, ~0.351, 
-      1.0, ~0.349, 
-      ~1.0, ~0.349, 
-
-      (* y = ~0.3 *)
-      ~1.0, ~0.298, 
-      ~1.0, ~0.302, 
-      1.0, ~0.302, 
-
-      1.0, ~0.302, 
-      1.0, ~0.298, 
-      ~1.0, ~0.298, 
-
-      (* y = ~0.25 *)
-      ~1.0, ~0.249, 
-      ~1.0, ~0.251, 
-      1.0, ~0.251, 
-
-      1.0, ~0.251, 
-      1.0, ~0.249, 
-      ~1.0, ~0.249, 
-
-      (* y = ~0.2 *)
-      ~1.0, ~0.198, 
-      ~1.0, ~0.202, 
-      1.0, ~0.202, 
-
-      1.0, ~0.202, 
-      1.0, ~0.198, 
-      ~1.0, ~0.198, 
-
-      (* y = ~0.15 *)
-      ~1.0, ~0.149, 
-      ~1.0, ~0.151, 
-      1.0, ~0.151, 
-
-      1.0, ~0.151, 
-      1.0, ~0.149, 
-      ~1.0, ~0.149, 
-
-      (* y = ~0.1 *)
-      ~1.0, ~0.098, 
-      ~1.0, ~0.102, 
-      1.0, ~0.102, 
-
-      1.0, ~0.102, 
-      1.0, ~0.098, 
-      ~1.0, ~0.098, 
-
-      (* y = ~0.05 *)
-      ~1.0, ~0.049, 
-      ~1.0, ~0.051, 
-      1.0, ~0.051, 
-
-      1.0, ~0.051, 
-      1.0, ~0.049, 
-      ~1.0, ~0.049, 
-
-      (* y = 0.0 *)
-      ~1.0, ~0.002, 
-      ~1.0, 0.002, 
-      1.0, 0.002, 
-
-      1.0, 0.002, 
-      1.0, ~0.002, 
-      ~1.0, ~0.002, 
-
-      (* y = 0.05 *)
-      ~1.0, 0.049, 
-      ~1.0, 0.051, 
-      1.0, 0.051, 
-
-      1.0, 0.051, 
-      1.0, 0.049, 
-      ~1.0, 0.049, 
-
-      (* y = 0.0 *)
-      ~1.0, 0.098, 
-      ~1.0, 0.102, 
-      1.0, 0.102, 
-
-      1.0, 0.102, 
-      1.0, 0.098, 
-      ~1.0, 0.098, 
-
-      (* y = 0.15 *)
-      ~1.0, 0.149, 
-      ~1.0, 0.151, 
-      1.0, 0.151, 
-
-      1.0, 0.151, 
-      1.0, 0.149, 
-      ~1.0, 0.149, 
-
-      (* y = 0.2 *)
-      ~1.0, 0.198, 
-      ~1.0, 0.202, 
-      1.0, 0.202, 
-
-      1.0, 0.202, 
-      1.0, 0.198, 
-      ~1.0, 0.198, 
-
-      (* y = 0.25 *)
-      ~1.0, 0.249, 
-      ~1.0, 0.251, 
-      1.0, 0.251, 
-
-      1.0, 0.251, 
-      1.0, 0.249, 
-      ~1.0, 0.249, 
-
-      (* y = 0.3 *)
-      ~1.0, 0.298, 
-      ~1.0, 0.302, 
-      1.0, 0.302, 
-
-      1.0, 0.302, 
-      1.0, 0.298, 
-      ~1.0, 0.298, 
-
-      (* y = 0.35 *)
-      ~1.0, 0.349, 
-      ~1.0, 0.351, 
-      1.0, 0.351, 
-
-      1.0, 0.351, 
-      1.0, 0.349, 
-      ~1.0, 0.349, 
-
-      (* y = 0.4 *)
-      ~1.0, 0.398, 
-      ~1.0, 0.402, 
-      1.0, 0.402, 
-
-      1.0, 0.402, 
-      1.0, 0.398, 
-      ~1.0, 0.398, 
-
-      (* y = 0.45 *)
-      ~1.0, 0.449, 
-      ~1.0, 0.451, 
-      1.0, 0.451, 
-
-      1.0, 0.451, 
-      1.0, 0.449, 
-      ~1.0, 0.449, 
-
-      (* y = 0.5 *)
-      ~1.0, 0.498, 
-      ~1.0, 0.502, 
-      1.0, 0.502, 
-
-      1.0, 0.502, 
-      1.0, 0.498, 
-      ~1.0, 0.498, 
-
-      (* y = 0.55 *)
-      ~1.0, 0.549, 
-      ~1.0, 0.551, 
-      1.0, 0.551, 
-
-      1.0, 0.551, 
-      1.0, 0.549, 
-      ~1.0, 0.549, 
-
-      (* y = 0.6 *)
-      ~1.0, 0.598, 
-      ~1.0, 0.602, 
-      1.0, 0.602, 
-
-      1.0, 0.602, 
-      1.0, 0.598, 
-      ~1.0, 0.598, 
-
-      (* y = 0.65 *)
-      ~1.0, 0.649, 
-      ~1.0, 0.651, 
-      1.0, 0.651, 
-
-      1.0, 0.651, 
-      1.0, 0.649, 
-      ~1.0, 0.649, 
-
-      (* y = 0.7 *)
-      ~1.0, 0.698, 
-      ~1.0, 0.702, 
-      1.0, 0.702, 
-
-      1.0, 0.702, 
-      1.0, 0.698, 
-      ~1.0, 0.698, 
-
-      (* y = 0.75 *)
-      ~1.0, 0.749, 
-      ~1.0, 0.751, 
-      1.0, 0.751, 
-
-      1.0, 0.751, 
-      1.0, 0.749, 
-      ~1.0, 0.749, 
-
-      (* y = 0.8 *)
-      ~1.0, 0.798, 
-      ~1.0, 0.802, 
-      1.0, 0.802, 
-
-      1.0, 0.802, 
-      1.0, 0.798, 
-      ~1.0, 0.798, 
-
-      (* y = 0.85 *)
-      ~1.0, 0.849, 
-      ~1.0, 0.851, 
-      1.0, 0.851, 
-
-      1.0, 0.851, 
-      1.0, 0.849, 
-      ~1.0, 0.849, 
-
-      (* y = 0.9 *)
-      ~1.0, 0.898, 
-      ~1.0, 0.902, 
-      1.0, 0.902, 
-
-      1.0, 0.902, 
-      1.0, 0.898, 
-      ~1.0, 0.898, 
-
-      (* y = 0.95 *)
-      ~1.0, 0.949, 
-      ~1.0, 0.951, 
-      1.0, 0.951, 
-
-      1.0, 0.951, 
-      1.0, 0.949, 
-      ~1.0, 0.949
-     ]
+  fun initGraphLines () =
+    let
+      val graphDrawObject = initDrawObject
+        (Constants.graphVertexShaderString, Constants.graphFragmentShaderString)
+      val {vertexBuffer, program, ...} = graphDrawObject
+
+      val _ = Gles3.bindBuffer vertexBuffer
+      val _ =
+        Gles3.bufferData
+          ( Constants.graphLines
+          , Vector.length Constants.graphLines
+          , Gles3.STATIC_DRAW ()
+          )
+      val _ = Gles3.vertexAttribPointer (0, 2)
+      val _ = Gles3.enableVertexAttribArray 0
+    in
+      graphDrawObject
+    end
+
+  fun drawGraphLines (graphDrawObject: draw_object) =
+    let
+      val {program, ...} = graphDrawObject
+      val _ = Gles3.useProgram (program)
+      val _ = Gles3.drawArrays
+        (Gles3.TRIANGLES (), 0, Vector.length Constants.graphLines div 2)
+    in
+      ()
+    end
 end
diff --git a/imperative-shell/constants.sml b/imperative-shell/constants.sml
index 0ea1c43..0068c1e 100644
--- a/imperative-shell/constants.sml
+++ b/imperative-shell/constants.sml
@@ -15,5 +15,710 @@ struct
     \void main()\n\
     \{\n\
     \   FragColor = vec4(0.0f, 0.0f, 0.0f, 1.0f);\n\
-    \}";
+    \}"
+
+  val graphLines: Real32.real vector = 
+    #[
+      (* x = ~0.95 *)
+      ~0.949, ~1.0,
+      ~0.951, ~1.0,
+      ~0.951, 1.0,
+
+      ~0.951, 1.0,
+      ~0.949, 1.0,
+      ~0.949, ~1.0,
+
+      (* x = ~0.9 *)
+      ~0.898, ~1.0,
+      ~0.902, ~1.0,
+      ~0.902, 1.0,
+
+      ~0.902, 1.0,
+      ~0.898, 1.0,
+      ~0.898, ~1.0,
+
+      (* x = ~0.85 *)
+      ~0.849, ~1.0,
+      ~0.851, ~1.0,
+      ~0.851, 1.0,
+
+      ~0.851, 1.0,
+      ~0.849, 1.0,
+      ~0.849, ~1.0,
+
+      (* x = ~0.8 *)
+      ~0.798, ~1.0,
+      ~0.802, ~1.0,
+      ~0.802, 1.0,
+
+      ~0.802, 1.0,
+      ~0.798, 1.0,
+      ~0.798, ~1.0,
+
+      (* x = ~0.75 *)
+      ~0.749, ~1.0,
+      ~0.751, ~1.0,
+      ~0.751, 1.0,
+
+      ~0.751, 1.0,
+      ~0.749, 1.0,
+      ~0.749, ~1.0,
+
+      (* x = ~0.7 *)
+      ~0.698, ~1.0,
+      ~0.702, ~1.0,
+      ~0.702, 1.0,
+
+      ~0.702, 1.0,
+      ~0.698, 1.0,
+      ~0.698, ~1.0,
+
+      (* x = ~0.65 *)
+      ~0.649, ~1.0,
+      ~0.651, ~1.0,
+      ~0.651, 1.0,
+
+      ~0.651, 1.0,
+      ~0.649, 1.0,
+      ~0.649, ~1.0,
+
+      (* x = ~0.6 *)
+      ~0.598, ~1.0,
+      ~0.602, ~1.0,
+      ~0.602, 1.0,
+
+      ~0.602, 1.0,
+      ~0.598, 1.0,
+      ~0.598, ~1.0,
+
+      (* x = ~0.55 *)
+      ~0.549, ~1.0,
+      ~0.551, ~1.0,
+      ~0.551, 1.0,
+
+      ~0.551, 1.0,
+      ~0.549, 1.0,
+      ~0.549, ~1.0,
+
+      (* x = ~0.5 *)
+      ~0.498, ~1.0,
+      ~0.502, ~1.0,
+      ~0.502, 1.0,
+
+      ~0.502, 1.0,
+      ~0.498, 1.0,
+      ~0.498, ~1.0,
+
+      (* x = ~0.45 *)
+      ~0.449, ~1.0,
+      ~0.451, ~1.0,
+      ~0.451, 1.0,
+
+      ~0.451, 1.0,
+      ~0.449, 1.0,
+      ~0.449, ~1.0,
+
+      (* x = ~0.4 *)
+      ~0.398, ~1.0,
+      ~0.402, ~1.0,
+      ~0.402, 1.0,
+
+      ~0.402, 1.0,
+      ~0.398, 1.0,
+      ~0.398, ~1.0,
+
+      (* x = ~0.35 *)
+      ~0.349, ~1.0,
+      ~0.351, ~1.0,
+      ~0.351, 1.0,
+
+      ~0.351, 1.0,
+      ~0.349, 1.0,
+      ~0.349, ~1.0,
+
+      (* x = ~0.3 *)
+      ~0.298, ~1.0,
+      ~0.302, ~1.0,
+      ~0.302, 1.0,
+
+      ~0.302, 1.0,
+      ~0.298, 1.0,
+      ~0.298, ~1.0,
+
+      (* x = ~0.25 *)
+      ~0.249, ~1.0,
+      ~0.251, ~1.0,
+      ~0.251, 1.0,
+
+      ~0.251, 1.0,
+      ~0.249, 1.0,
+      ~0.249, ~1.0,
+
+      (* x = ~0.2 *)
+      ~0.198, ~1.0,
+      ~0.202, ~1.0,
+      ~0.202, 1.0,
+
+      ~0.202, 1.0,
+      ~0.198, 1.0,
+      ~0.198, ~1.0,
+
+      (* x = ~0.15 *)
+      ~0.149, ~1.0,
+      ~0.151, ~1.0,
+      ~0.151, 1.0,
+
+      ~0.151, 1.0,
+      ~0.149, 1.0,
+      ~0.149, ~1.0,
+
+      (* x = ~0.1 *)
+      ~0.098, ~1.0,
+      ~0.102, ~1.0,
+      ~0.102, 1.0,
+
+      ~0.102, 1.0,
+      ~0.098, 1.0,
+      ~0.098, ~1.0,
+
+      (* x = ~0.05 *)
+      ~0.049, ~1.0,
+      ~0.051, ~1.0,
+      ~0.051, 1.0,
+
+      ~0.051, 1.0,
+      ~0.049, 1.0,
+      ~0.049, ~1.0,
+
+      (* x = 0.0 *)
+      ~0.002, ~1.0,
+      0.002, ~1.0,
+      0.002, 1.0,
+
+      0.002, 1.0,
+      ~0.002, 1.0,
+      ~0.002, ~1.0,
+
+      (* x = 0.05 *)
+      0.049, ~1.0,
+      0.051, ~1.0,
+      0.051, 1.0,
+
+      0.051, 1.0,
+      0.049, 1.0,
+      0.049, ~1.0,
+
+      (* x = 0.0 *)
+      0.098, ~1.0,
+      0.102, ~1.0,
+      0.102, 1.0,
+
+      0.102, 1.0,
+      0.098, 1.0,
+      0.098, ~1.0,
+
+      (* x = 0.15 *)
+      0.149, ~1.0,
+      0.151, ~1.0,
+      0.151, 1.0,
+
+      0.151, 1.0,
+      0.149, 1.0,
+      0.149, ~1.0,
+
+      (* x = 0.2 *)
+      0.198, ~1.0,
+      0.202, ~1.0,
+      0.202, 1.0,
+
+      0.202, 1.0,
+      0.198, 1.0,
+      0.198, ~1.0,
+
+      (* x = 0.25 *)
+      0.249, ~1.0,
+      0.251, ~1.0,
+      0.251, 1.0,
+
+      0.251, 1.0,
+      0.249, 1.0,
+      0.249, ~1.0,
+
+      (* x = 0.3 *)
+      0.298, ~1.0,
+      0.302, ~1.0,
+      0.302, 1.0,
+
+      0.302, 1.0,
+      0.298, 1.0,
+      0.298, ~1.0,
+
+      (* x = 0.35 *)
+      0.349, ~1.0,
+      0.351, ~1.0,
+      0.351, 1.0,
+
+      0.351, 1.0,
+      0.349, 1.0,
+      0.349, ~1.0,
+
+      (* x = 0.4 *)
+      0.398, ~1.0,
+      0.402, ~1.0,
+      0.402, 1.0,
+
+      0.402, 1.0,
+      0.398, 1.0,
+      0.398, ~1.0,
+
+      (* x = 0.45 *)
+      0.449, ~1.0,
+      0.451, ~1.0,
+      0.451, 1.0,
+
+      0.451, 1.0,
+      0.449, 1.0,
+      0.449, ~1.0,
+
+      (* x = 0.5 *)
+      0.498, ~1.0,
+      0.502, ~1.0,
+      0.502, 1.0,
+
+      0.502, 1.0,
+      0.498, 1.0,
+      0.498, ~1.0,
+
+      (* x = 0.55 *)
+      0.549, ~1.0,
+      0.551, ~1.0,
+      0.551, 1.0,
+
+      0.551, 1.0,
+      0.549, 1.0,
+      0.549, ~1.0,
+
+      (* x = 0.6 *)
+      0.598, ~1.0,
+      0.602, ~1.0,
+      0.602, 1.0,
+
+      0.602, 1.0,
+      0.598, 1.0,
+      0.598, ~1.0,
+
+      (* x = 0.65 *)
+      0.649, ~1.0,
+      0.651, ~1.0,
+      0.651, 1.0,
+
+      0.651, 1.0,
+      0.649, 1.0,
+      0.649, ~1.0,
+
+      (* x = 0.7 *)
+      0.698, ~1.0,
+      0.702, ~1.0,
+      0.702, 1.0,
+
+      0.702, 1.0,
+      0.698, 1.0,
+      0.698, ~1.0,
+
+      (* x = 0.75 *)
+      0.749, ~1.0,
+      0.751, ~1.0,
+      0.751, 1.0,
+
+      0.751, 1.0,
+      0.749, 1.0,
+      0.749, ~1.0,
+
+      (* x = 0.8 *)
+      0.798, ~1.0,
+      0.802, ~1.0,
+      0.802, 1.0,
+
+      0.802, 1.0,
+      0.798, 1.0,
+      0.798, ~1.0,
+
+      (* x = 0.85 *)
+      0.849, ~1.0,
+      0.851, ~1.0,
+      0.851, 1.0,
+
+      0.851, 1.0,
+      0.849, 1.0,
+      0.849, ~1.0,
+
+      (* x = 0.9 *)
+      0.898, ~1.0,
+      0.902, ~1.0,
+      0.902, 1.0,
+
+      0.902, 1.0,
+      0.898, 1.0,
+      0.898, ~1.0,
+
+      (* x = 0.95 *)
+      0.949, ~1.0,
+      0.951, ~1.0,
+      0.951, 1.0,
+
+      0.951, 1.0,
+      0.949, 1.0,
+      0.949, ~1.0,
+
+      (* y = ~0.95 *)
+      ~1.0, ~0.949,
+      ~1.0, ~0.951,
+      1.0, ~0.951, 
+
+      1.0, ~0.951,
+      1.0, ~0.949,
+      ~1.0, ~0.949,
+
+      (* y = ~0.9 *)
+      ~1.0, ~0.898, 
+      ~1.0, ~0.902, 
+      1.0, ~0.902, 
+
+      1.0, ~0.902, 
+      1.0, ~0.898, 
+      ~1.0, ~0.898, 
+
+      (* y = ~0.85 *)
+      ~1.0, ~0.849, 
+      ~1.0, ~0.851, 
+      1.0, ~0.851, 
+
+      1.0, ~0.851, 
+      1.0, ~0.849, 
+      ~1.0, ~0.849, 
+
+      (* y = ~0.8 *)
+      ~1.0, ~0.798, 
+      ~1.0, ~0.802, 
+      1.0, ~0.802, 
+
+      1.0, ~0.802, 
+      1.0, ~0.798, 
+      ~1.0, ~0.798, 
+
+      (* y = ~0.75 *)
+      ~1.0, ~0.749, 
+      ~1.0, ~0.751, 
+      1.0, ~0.751, 
+
+      1.0, ~0.751, 
+      1.0, ~0.749, 
+      ~1.0, ~0.749, 
+
+      (* y = ~0.7 *)
+      ~1.0, ~0.698, 
+      ~1.0, ~0.702, 
+      1.0, ~0.702, 
+
+      1.0, ~0.702, 
+      1.0, ~0.698, 
+      ~1.0, ~0.698, 
+
+      (* y = ~0.65 *)
+      ~1.0, ~0.649, 
+      ~1.0, ~0.651, 
+      1.0, ~0.651, 
+
+      1.0, ~0.651, 
+      1.0, ~0.649, 
+      ~1.0, ~0.649, 
+
+      (* y = ~0.6 *)
+      ~1.0, ~0.598, 
+      ~1.0, ~0.602, 
+      1.0, ~0.602, 
+
+      1.0, ~0.602, 
+      1.0, ~0.598, 
+      ~1.0, ~0.598, 
+
+      (* y = ~0.55 *)
+      ~1.0, ~0.549, 
+      ~1.0, ~0.551, 
+      1.0, ~0.551, 
+
+      1.0, ~0.551, 
+      1.0, ~0.549, 
+      ~1.0, ~0.549, 
+
+      (* y = ~0.5 *)
+      ~1.0, ~0.498, 
+      ~1.0, ~0.502, 
+      1.0, ~0.502, 
+
+      1.0, ~0.502, 
+      1.0, ~0.498, 
+      ~1.0, ~0.498, 
+
+      (* y = ~0.45 *)
+      ~1.0, ~0.449, 
+      ~1.0, ~0.451, 
+      1.0, ~0.451, 
+
+      1.0, ~0.451, 
+      1.0, ~0.449, 
+      ~1.0, ~0.449, 
+
+      (* y = ~0.4 *)
+      ~1.0, ~0.398, 
+      ~1.0, ~0.402, 
+      1.0, ~0.402, 
+
+      1.0, ~0.402, 
+      1.0, ~0.398, 
+      ~1.0, ~0.398, 
+
+      (* y = ~0.35 *)
+      ~1.0, ~0.349, 
+      ~1.0, ~0.351, 
+      1.0, ~0.351, 
+
+      1.0, ~0.351, 
+      1.0, ~0.349, 
+      ~1.0, ~0.349, 
+
+      (* y = ~0.3 *)
+      ~1.0, ~0.298, 
+      ~1.0, ~0.302, 
+      1.0, ~0.302, 
+
+      1.0, ~0.302, 
+      1.0, ~0.298, 
+      ~1.0, ~0.298, 
+
+      (* y = ~0.25 *)
+      ~1.0, ~0.249, 
+      ~1.0, ~0.251, 
+      1.0, ~0.251, 
+
+      1.0, ~0.251, 
+      1.0, ~0.249, 
+      ~1.0, ~0.249, 
+
+      (* y = ~0.2 *)
+      ~1.0, ~0.198, 
+      ~1.0, ~0.202, 
+      1.0, ~0.202, 
+
+      1.0, ~0.202, 
+      1.0, ~0.198, 
+      ~1.0, ~0.198, 
+
+      (* y = ~0.15 *)
+      ~1.0, ~0.149, 
+      ~1.0, ~0.151, 
+      1.0, ~0.151, 
+
+      1.0, ~0.151, 
+      1.0, ~0.149, 
+      ~1.0, ~0.149, 
+
+      (* y = ~0.1 *)
+      ~1.0, ~0.098, 
+      ~1.0, ~0.102, 
+      1.0, ~0.102, 
+
+      1.0, ~0.102, 
+      1.0, ~0.098, 
+      ~1.0, ~0.098, 
+
+      (* y = ~0.05 *)
+      ~1.0, ~0.049, 
+      ~1.0, ~0.051, 
+      1.0, ~0.051, 
+
+      1.0, ~0.051, 
+      1.0, ~0.049, 
+      ~1.0, ~0.049, 
+
+      (* y = 0.0 *)
+      ~1.0, ~0.002, 
+      ~1.0, 0.002, 
+      1.0, 0.002, 
+
+      1.0, 0.002, 
+      1.0, ~0.002, 
+      ~1.0, ~0.002, 
+
+      (* y = 0.05 *)
+      ~1.0, 0.049, 
+      ~1.0, 0.051, 
+      1.0, 0.051, 
+
+      1.0, 0.051, 
+      1.0, 0.049, 
+      ~1.0, 0.049, 
+
+      (* y = 0.0 *)
+      ~1.0, 0.098, 
+      ~1.0, 0.102, 
+      1.0, 0.102, 
+
+      1.0, 0.102, 
+      1.0, 0.098, 
+      ~1.0, 0.098, 
+
+      (* y = 0.15 *)
+      ~1.0, 0.149, 
+      ~1.0, 0.151, 
+      1.0, 0.151, 
+
+      1.0, 0.151, 
+      1.0, 0.149, 
+      ~1.0, 0.149, 
+
+      (* y = 0.2 *)
+      ~1.0, 0.198, 
+      ~1.0, 0.202, 
+      1.0, 0.202, 
+
+      1.0, 0.202, 
+      1.0, 0.198, 
+      ~1.0, 0.198, 
+
+      (* y = 0.25 *)
+      ~1.0, 0.249, 
+      ~1.0, 0.251, 
+      1.0, 0.251, 
+
+      1.0, 0.251, 
+      1.0, 0.249, 
+      ~1.0, 0.249, 
+
+      (* y = 0.3 *)
+      ~1.0, 0.298, 
+      ~1.0, 0.302, 
+      1.0, 0.302, 
+
+      1.0, 0.302, 
+      1.0, 0.298, 
+      ~1.0, 0.298, 
+
+      (* y = 0.35 *)
+      ~1.0, 0.349, 
+      ~1.0, 0.351, 
+      1.0, 0.351, 
+
+      1.0, 0.351, 
+      1.0, 0.349, 
+      ~1.0, 0.349, 
+
+      (* y = 0.4 *)
+      ~1.0, 0.398, 
+      ~1.0, 0.402, 
+      1.0, 0.402, 
+
+      1.0, 0.402, 
+      1.0, 0.398, 
+      ~1.0, 0.398, 
+
+      (* y = 0.45 *)
+      ~1.0, 0.449, 
+      ~1.0, 0.451, 
+      1.0, 0.451, 
+
+      1.0, 0.451, 
+      1.0, 0.449, 
+      ~1.0, 0.449, 
+
+      (* y = 0.5 *)
+      ~1.0, 0.498, 
+      ~1.0, 0.502, 
+      1.0, 0.502, 
+
+      1.0, 0.502, 
+      1.0, 0.498, 
+      ~1.0, 0.498, 
+
+      (* y = 0.55 *)
+      ~1.0, 0.549, 
+      ~1.0, 0.551, 
+      1.0, 0.551, 
+
+      1.0, 0.551, 
+      1.0, 0.549, 
+      ~1.0, 0.549, 
+
+      (* y = 0.6 *)
+      ~1.0, 0.598, 
+      ~1.0, 0.602, 
+      1.0, 0.602, 
+
+      1.0, 0.602, 
+      1.0, 0.598, 
+      ~1.0, 0.598, 
+
+      (* y = 0.65 *)
+      ~1.0, 0.649, 
+      ~1.0, 0.651, 
+      1.0, 0.651, 
+
+      1.0, 0.651, 
+      1.0, 0.649, 
+      ~1.0, 0.649, 
+
+      (* y = 0.7 *)
+      ~1.0, 0.698, 
+      ~1.0, 0.702, 
+      1.0, 0.702, 
+
+      1.0, 0.702, 
+      1.0, 0.698, 
+      ~1.0, 0.698, 
+
+      (* y = 0.75 *)
+      ~1.0, 0.749, 
+      ~1.0, 0.751, 
+      1.0, 0.751, 
+
+      1.0, 0.751, 
+      1.0, 0.749, 
+      ~1.0, 0.749, 
+
+      (* y = 0.8 *)
+      ~1.0, 0.798, 
+      ~1.0, 0.802, 
+      1.0, 0.802, 
+
+      1.0, 0.802, 
+      1.0, 0.798, 
+      ~1.0, 0.798, 
+
+      (* y = 0.85 *)
+      ~1.0, 0.849, 
+      ~1.0, 0.851, 
+      1.0, 0.851, 
+
+      1.0, 0.851, 
+      1.0, 0.849, 
+      ~1.0, 0.849, 
+
+      (* y = 0.9 *)
+      ~1.0, 0.898, 
+      ~1.0, 0.902, 
+      1.0, 0.902, 
+
+      1.0, 0.902, 
+      1.0, 0.898, 
+      ~1.0, 0.898, 
+
+      (* y = 0.95 *)
+      ~1.0, 0.949, 
+      ~1.0, 0.951, 
+      1.0, 0.951, 
+
+      1.0, 0.951, 
+      1.0, 0.949, 
+      ~1.0, 0.949
+     ]
 end
diff --git a/imperative-shell/shell.sml b/imperative-shell/shell.sml
index fbf5c80..17edf32 100644
--- a/imperative-shell/shell.sml
+++ b/imperative-shell/shell.sml
@@ -5,39 +5,42 @@ struct
   datatype msg = KEY of int * int * int * int
 
   fun keyCallback mailbox (key, scancode, action, mode) =
-    (print "hello\n";
-    Mailbox.send  (mailbox, (KEY (key, scancode, action, mode))))
+    ( print "hello\n"
+    ; Mailbox.send (mailbox, (KEY (key, scancode, action, mode)))
+    )
 
   fun callbackListener mailbox =
-  let
-    val _ =
-      case Mailbox.recv mailbox of
-         KEY (key, scancode, action, mode) =>
-           print (String.concat
-             [ "key: "
-             , Int.toString key
-             , " scancode: "
-             , Int.toString scancode
-             , " action: "
-             , Int.toString action
-             , " mode: "
-             , Int.toString mode
-             , "\n"
-             ])
-  in
-    callbackListener mailbox
-  end
+    let
+      val _ =
+        case Mailbox.recv mailbox of
+          KEY (key, scancode, action, mode) =>
+            print (String.concat
+              [ "key: "
+              , Int.toString key
+              , " scancode: "
+              , Int.toString scancode
+              , " action: "
+              , Int.toString action
+              , " mode: "
+              , Int.toString mode
+              , "\n"
+              ])
+    in
+      callbackListener mailbox
+    end
 
-  fun loop (window) =
+  fun loop (window, graphDrawObject) =
     if not (Glfw.windowShouldClose window) then
       let
-        val _ = Gles3.clearColor (0.1, 0.1, 0.1, 0.1)
+        val _ = Gles3.clearColor (1.0, 1.0, 1.0, 1.0)
         val _ = Gles3.clear ()
 
+        val _ = AppDraw.drawGraphLines graphDrawObject
+
         val _ = Glfw.pollEvents ()
         val _ = Glfw.swapBuffers window
       in
-        loop (window)
+        loop (window, graphDrawObject)
       end
     else
       Glfw.terminate ()
@@ -53,6 +56,8 @@ struct
       val _ = Glfw.makeContextCurrent window
       val _ = Gles3.loadGlad ()
 
+      val graphDrawObject = AppDraw.initGraphLines ()
+
       val inputMailbox = Mailbox.mailbox ()
       (* Set callback sender *)
       val _ = CML.spawn (fn () =>
@@ -66,7 +71,7 @@ struct
       (* Set callback listener *)
       val _ = CML.spawn (fn () => callbackListener inputMailbox)
     in
-      loop (window)
+      loop (window, graphDrawObject)
     end
 end