diff --git a/dotscape b/dotscape
index 4fc28fd..86ba19b 100755
Binary files a/dotscape and b/dotscape differ
diff --git a/ffi/glfw-input.c b/ffi/glfw-input.c
index 5538bf6..756094c 100644
--- a/ffi/glfw-input.c
+++ b/ffi/glfw-input.c
@@ -4,8 +4,10 @@
 int PRESS = GLFW_PRESS;
 int RELEASE = GLFW_RELEASE;
 int LEFT_MOUSE_BUTTON = GLFW_MOUSE_BUTTON_1;
-int KEY_Z = GLFW_KEY_Z;
+
+int KEY_G = GLFW_KEY_G;
 int KEY_Y = GLFW_KEY_Y;
+int KEY_Z = GLFW_KEY_Z;
 
 // Calls function exported from SML 
 void mouseMoveCallback(GLFWwindow *window, double xpos, double ypos) {
diff --git a/ffi/glfw-input.sml b/ffi/glfw-input.sml
index f829574..ab59740 100644
--- a/ffi/glfw-input.sml
+++ b/ffi/glfw-input.sml
@@ -31,8 +31,10 @@ struct
     _export "mltonKeyCallback" public : (int * int * int * int -> unit) -> unit;
   val setKeyCallback = _import "setKeyCallback" public reentrant : window -> unit;
 
-  val (KEY_Z, _) =
-    _symbol "KEY_Z" public : ( unit -> int ) * ( int -> unit );
+  val (KEY_G, _) =
+    _symbol "KEY_G" public : ( unit -> int ) * ( int -> unit );
   val (KEY_Y, _) =
     _symbol "KEY_Y" public : ( unit -> int ) * ( int -> unit );
+  val (KEY_Z, _) =
+    _symbol "KEY_Z" public : ( unit -> int ) * ( int -> unit );
 end
diff --git a/functional-core/app-init.sml b/functional-core/app-init.sml
index 0bc5b17..c4d3ac2 100644
--- a/functional-core/app-init.sml
+++ b/functional-core/app-init.sml
@@ -23,6 +23,7 @@ struct
       , redo = []
       , mouseX = 0.0
       , mouseY = 0.0
+      , showGraph = true
       }
     end
 
diff --git a/functional-core/app-type.sml b/functional-core/app-type.sml
index bda5e45..38d7045 100644
--- a/functional-core/app-type.sml
+++ b/functional-core/app-type.sml
@@ -26,6 +26,7 @@ sig
     , redo: (Real32.real * Real32.real) list
     , mouseX: Real32.real
     , mouseY: Real32.real
+    , showGraph: bool
     }
 end
 
@@ -65,5 +66,6 @@ struct
     , redo: (Real32.real * Real32.real) list
     , mouseX: Real32.real
     , mouseY: Real32.real
+    , showGraph: bool
     }
 end
diff --git a/functional-core/app-update.sml b/functional-core/app-update.sml
index 2ac9ad4..da721df 100644
--- a/functional-core/app-update.sml
+++ b/functional-core/app-update.sml
@@ -174,7 +174,26 @@ struct
              in
                (model, drawMsg)
              end)
-    | [] => (* Nothing to redo. *) (model, NO_DRAW)
+    | [] => 
+        (* Nothing to redo. *) 
+        (model, NO_DRAW)
+
+  fun toggleGraph (model: app_type) =
+    if #showGraph model then
+      let
+        val model = AppWith.graphVisibility (model, false)
+        val drawMsg = DRAW_GRAPH (Vector.fromList [])
+      in
+        (model, drawMsg)
+      end
+    else
+      let
+        val model = AppWith.graphVisibility (model, true)
+        val graphLines = GraphLines.generate model
+        val drawMsg = DRAW_GRAPH graphLines
+      in
+        (model, drawMsg)
+      end
 
   fun update (model: app_type, inputMsg) =
     case inputMsg of
@@ -187,4 +206,5 @@ struct
     | RESIZE_WINDOW {width, height} => resizeWindow (model, width, height)
     | UNDO_ACTION => undoAction model
     | REDO_ACTION => redoAction model
+    | KEY_G => toggleGraph model
 end
diff --git a/functional-core/app-with.sml b/functional-core/app-with.sml
index b8484a6..d784dda 100644
--- a/functional-core/app-with.sml
+++ b/functional-core/app-with.sml
@@ -1,5 +1,7 @@
 signature APP_WITH =
 sig
+  val graphVisibility: AppType.app_type * bool -> AppType.app_type
+
   val windowResize: AppType.app_type * int * int -> AppType.app_type
 
   val mousePosition: AppType.app_type * Real32.real * Real32.real
@@ -59,6 +61,7 @@ struct
         , redo = _
         , mouseX
         , mouseY
+        , showGraph
         } = app
 
       val newUndo = newUndoHd :: undo
@@ -73,6 +76,7 @@ struct
       , windowHeight = windowHeight
       , mouseX = mouseX
       , mouseY = mouseY
+      , showGraph = showGraph
       }
     end
 
@@ -89,6 +93,7 @@ struct
         , redo = _
         , mouseX
         , mouseY
+        , showGraph
         } = app
 
       val newTriangle = {x1 = x1, y1 = y1, x2 = x2, y2 = y2, x3 = x3, y3 = y3}
@@ -105,6 +110,7 @@ struct
       , windowHeight = windowHeight
       , mouseX = mouseX
       , mouseY = mouseY
+      , showGraph = showGraph
       }
     end
 
@@ -123,6 +129,7 @@ struct
         , redo
         , mouseX
         , mouseY
+        , showGraph
         } = app
 
       val xClickPoints = ClickPoints.generate (wStart, wFinish)
@@ -138,6 +145,7 @@ struct
       , redo = redo
       , mouseX = mouseX
       , mouseY = mouseY
+      , showGraph = showGraph
       }
     end
 
@@ -177,6 +185,7 @@ struct
         , windowHeight
         , undo
         , redo
+        , showGraph
         } = app
     in
       { mouseX = mouseX
@@ -189,6 +198,7 @@ struct
       , windowHeight = windowHeight
       , undo = undo
       , redo = redo
+      , showGraph = showGraph
       }
     end
 
@@ -206,6 +216,7 @@ struct
         , redo
         , mouseX
         , mouseY
+        , showGraph
         } = app
 
       val newUndo =
@@ -225,6 +236,7 @@ struct
       , windowHeight = windowHeight
       , mouseX = mouseX
       , mouseY = mouseY
+      , showGraph = showGraph
       }
     end
 
@@ -242,6 +254,7 @@ struct
         , redo
         , mouseX
         , mouseY
+        , showGraph
         } = app
 
       val newUndo = newUndoHd :: undo
@@ -260,6 +273,37 @@ struct
       , windowHeight = windowHeight
       , mouseX = mouseX
       , mouseY = mouseY
+      , showGraph = showGraph
+      }
+    end
+
+  fun graphVisibility (app: app_type, shouldShowGraph) =
+    let
+      val
+        { triangleStage
+        , triangles
+        , xClickPoints
+        , yClickPoints
+        , windowWidth
+        , windowHeight
+        , undo
+        , redo
+        , mouseX
+        , mouseY
+        , showGraph = _
+        } = app
+    in
+      { showGraph = shouldShowGraph
+      , triangleStage = triangleStage
+      , triangles = triangles
+      , undo = undo
+      , redo = redo
+      , xClickPoints = xClickPoints
+      , yClickPoints = yClickPoints
+      , windowWidth = windowWidth
+      , windowHeight = windowHeight
+      , mouseX = mouseX
+      , mouseY = mouseY
       }
     end
 end
diff --git a/imperative-shell/input-callbacks.sml b/imperative-shell/input-callbacks.sml
index 5122021..1f7c239 100644
--- a/imperative-shell/input-callbacks.sml
+++ b/imperative-shell/input-callbacks.sml
@@ -37,6 +37,10 @@ struct
     then
       (* ctrl-y *)
       Mailbox.send (mailbox, REDO_ACTION)
+    else if
+      key = Input.KEY_G () andalso action <> Input.RELEASE () andalso mods = 0x0
+    then
+      Mailbox.send (mailbox, KEY_G)
     else
       ()
 
diff --git a/message-types/draw-msg.sml b/message-types/draw-msg.sml
index 4c048c0..a2041bc 100644
--- a/message-types/draw-msg.sml
+++ b/message-types/draw-msg.sml
@@ -5,6 +5,7 @@ sig
   | DRAW_TRIANGLES_AND_BUTTONS of
       {triangles: Real32.real vector, buttons: Real32.real vector}
   | DRAW_TRIANGLES_AND_RESET_BUTTONS of Real32.real vector
+  | DRAW_GRAPH of Real32.real vector
   | RESIZE_TRIANGLES_BUTTONS_AND_GRAPH of
       {triangles: Real32.real vector, graphLines: Real32.real vector}
   | CLEAR_BUTTONS
@@ -18,6 +19,7 @@ struct
   | DRAW_TRIANGLES_AND_BUTTONS of
       {triangles: Real32.real vector, buttons: Real32.real vector}
   | DRAW_TRIANGLES_AND_RESET_BUTTONS of Real32.real vector
+  | DRAW_GRAPH of Real32.real vector
   | RESIZE_TRIANGLES_BUTTONS_AND_GRAPH of
       {triangles: Real32.real vector, graphLines: Real32.real vector}
   | CLEAR_BUTTONS
diff --git a/message-types/input-msg.sml b/message-types/input-msg.sml
index 4f8b6f2..fde5675 100644
--- a/message-types/input-msg.sml
+++ b/message-types/input-msg.sml
@@ -7,6 +7,7 @@ sig
   | RESIZE_WINDOW of {width: int, height: int}
   | UNDO_ACTION
   | REDO_ACTION
+  | KEY_G
 end
 
 structure InputMessage :> INPUT_MESSAGE =
@@ -18,4 +19,5 @@ struct
   | RESIZE_WINDOW of {width: int, height: int}
   | UNDO_ACTION
   | REDO_ACTION
+  | KEY_G
 end