diff --git a/dotscape b/dotscape
index 95450d8..b876354 100755
Binary files a/dotscape and b/dotscape differ
diff --git a/fcore/graph-lines.sml b/fcore/graph-lines.sml
index bd35199..e6e180e 100644
--- a/fcore/graph-lines.sml
+++ b/fcore/graph-lines.sml
@@ -11,8 +11,8 @@ struct
       Vector.concat acc
     else
       let
-        val halfWidth = Real32.fromInt (windowWidth div 2)
-        val halfHeight = Real32.fromInt (windowHeight div 2)
+        val halfWidth = Real32.fromInt windowWidth / 2.0
+        val halfHeight = Real32.fromInt windowHeight / 2.0
 
         val curX = Vector.sub (xClickPoints, pos)
         val minusX = (curX - halfWidth - 1.0) / halfWidth
@@ -35,14 +35,12 @@ struct
       acc
     else
       let
-        val halfWidth = windowHeight div 2
-        val halfWidth = Real32.fromInt halfWidth
-        val halfHeight = windowHeight div 2
-        val halfHeight = Real32.fromInt halfHeight
+        val halfWidth = Real32.fromInt windowWidth / 2.0
+        val halfHeight = Real32.fromInt windowHeight / 2.0
 
         val curY = Vector.sub (yClickPoints, pos)
-        val minusY = ~(curY - halfHeight - 1.0) / halfHeight
-        val plusY = ~(curY - halfHeight + 1.0) / halfHeight
+        val minusY = (~(curY - halfHeight - 1.0)) / halfHeight
+        val plusY = (~(curY - halfHeight + 1.0)) / halfHeight
 
         val minX = Vector.sub (xClickPoints, 0)
         val minX = (minX - halfWidth) / halfWidth