diff --git a/dotscape b/dotscape
index 8e6a97b..66f2e3c 100755
Binary files a/dotscape and b/dotscape differ
diff --git a/temp-squares/fcore/app-update.sml b/temp-squares/fcore/app-update.sml
index c0005c8..e9083ff 100644
--- a/temp-squares/fcore/app-update.sml
+++ b/temp-squares/fcore/app-update.sml
@@ -41,4 +41,16 @@ struct
       Vector.concat [tl, tr, bl, br]
     end
 
+  fun mouseMoveOrRelease (model: app_type) =
+    let
+      val drawVec =
+        case ClickPoints.getClickPositionFromMouse model of
+          SOME (hIdx, vIdx) => getDotVecFromIndices (model, hIdx, vIdx)
+        | NONE => Vector.fromList []
+
+      val drawMsg = DRAW_DOT drawVec
+      val drawMsg = [DRAW drawMsg]
+    in
+      (model, drawMsg)
+    end
 end
diff --git a/temp-squares/fcore/click-points.sml b/temp-squares/fcore/click-points.sml
index d0922de..0b9edd2 100644
--- a/temp-squares/fcore/click-points.sml
+++ b/temp-squares/fcore/click-points.sml
@@ -10,6 +10,35 @@ struct
         (Real32.fromInt idx * increment) + start)
     end
 
+  (*
+   * Range to detect from clickable position. 
+   * For example, if we have a clickable position at (x, y) = (500, 500),
+   * with a range of 15, we can detect clicks targeting this position 
+   * from top left at (485, 485) to bottom right at (515, 515).
+   * *)
+  val range = 15.0
+
+  fun getClickPos (clickPoints, mousePos, idx) =
+    if idx = Vector.length clickPoints then
+      NONE
+    else
+      let
+        val curPos = Vector.sub (clickPoints, idx)
+      in
+        if mousePos < curPos - range orelse mousePos > curPos + range then
+          getClickPos (clickPoints, mousePos, idx + 1)
+        else
+          SOME idx
+      end
+
+  fun getClickPositionFromMouse (app: AppType.app_type) =
+    case getClickPos (#xClickPoints app, #mouseX app, 0) of
+      SOME hIdx =>
+        (case getClickPos (#yClickPoints app, #mouseY app, 0) of
+           SOME vIdx => SOME (hIdx, vIdx)
+         | NONE => NONE)
+    | NONE => NONE
+
   fun getDrawDot (xpos, ypos, windowWidth, windowHeight) =
     let
       (* calculate normalised device coordinates *)