From dd933921c22a2ad0822fe33d8d1420d1663bb8fe Mon Sep 17 00:00:00 2001
From: denz1994 <denz1994@gmail.com>
Date: Tue, 29 May 2018 17:47:13 -0400
Subject: [PATCH] Background added to massNodes so all svg elements are
 painted. #278.

---
 js/common/view/MassNode.js     | 4 ++++
 js/lab/view/PeriodTraceNode.js | 1 +
 2 files changed, 5 insertions(+)

diff --git a/js/common/view/MassNode.js b/js/common/view/MassNode.js
index 10159beb..3734c041 100644
--- a/js/common/view/MassNode.js
+++ b/js/common/view/MassNode.js
@@ -121,6 +121,10 @@ define( function( require ) {
     } );
     this.addChild( this.hookNode );
 
+    // Background added so all of svg elements are painted. See https://github.com/phetsims/masses-and-springs/issues/278
+    this.background = new Rectangle( this.bounds.dilated( 1.10 ), { pickable: false } );
+    this.addChild( this.background );
+
     if ( !mass.icon ) {
       var labelString = mass.mysteryLabel ? questionMarkString : StringUtils.fillIn( massValueString, { mass: mass.mass * 1000 } );
       var label = new Text( labelString, {
diff --git a/js/lab/view/PeriodTraceNode.js b/js/lab/view/PeriodTraceNode.js
index 5bd0dd30..87b62e57 100644
--- a/js/lab/view/PeriodTraceNode.js
+++ b/js/lab/view/PeriodTraceNode.js
@@ -118,6 +118,7 @@ define( function( require ) {
               // second line
               this.shape.verticalLineTo( state === 2 ? currentYPosition : secondPeakYPosition + this.path.lineWidth / 2 );
               if ( state > 2 && !this.periodTrace.thresholdReached ) {
+
                 // second connector
                 this.shape.horizontalLineTo( this.lastX );