From 292cc1c8e528f8e955dabbcf6ec068c15dd63f3e Mon Sep 17 00:00:00 2001
From: zepumph <michael.kauzmann@colorado.edu>
Date: Tue, 27 Nov 2018 20:34:46 -0900
Subject: [PATCH] don't alert left/right when amplitude is not settled,
 https://github.com/phetsims/friction/issues/136

---
 js/friction/view/describers/BookMovementDescriber.js | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/js/friction/view/describers/BookMovementDescriber.js b/js/friction/view/describers/BookMovementDescriber.js
index 8f301460..9516f130 100644
--- a/js/friction/view/describers/BookMovementDescriber.js
+++ b/js/friction/view/describers/BookMovementDescriber.js
@@ -110,7 +110,10 @@ define( require => {
 
           // if both the left and right alerts haven't yet been alerted while separated
           if ( !this.separatedAlertPair.bothAlerted() ) {
-            this.alertDirections( direction );
+
+            if ( this.model.amplitudeProperty.value < FrictionModel.AMPLITUDE_SETTLED_THRESHOLD ) {
+              this.alertDirections( direction );
+            }
             this.separatedAlertPair.updateFromDirection( direction );
           }