From 5e8a85bae1b906e687e3381f93c02f83566b59fb Mon Sep 17 00:00:00 2001
From: chrisklus <christopher.klusendorf@colorado.edu>
Date: Wed, 1 May 2019 21:52:17 -0600
Subject: [PATCH] Instrument thermometer tick marks, see
 https://github.com/phetsims/blackbody-spectrum/issues/83

---
 .../view/BlackbodySpectrumThermometer.js      | 16 ++++---
 ...body-spectrum-phet-io-elements-baseline.js | 44 +++++++++++++++++++
 2 files changed, 54 insertions(+), 6 deletions(-)

diff --git a/js/blackbody-spectrum/view/BlackbodySpectrumThermometer.js b/js/blackbody-spectrum/view/BlackbodySpectrumThermometer.js
index 87453e0..82b4142 100644
--- a/js/blackbody-spectrum/view/BlackbodySpectrumThermometer.js
+++ b/js/blackbody-spectrum/view/BlackbodySpectrumThermometer.js
@@ -71,9 +71,11 @@ define( function( require ) {
     ThermometerNode.call( this, options.minTemperature, options.maxTemperature, temperatureProperty, options );
 
     // labeled tick marks
-    for ( var i = 0; i < TICK_MARKS.length; i++ ) {
-      this.addChild( this.createLabeledTick( TICK_MARKS[ i ].text, TICK_MARKS[ i ].temperature, options ) );
-    }
+    const tickContainer = new Node( {
+      children: _.range( 0, TICK_MARKS.length ).map( i => this.createLabeledTick( i, options ) ),
+      tandem: options.tandem.createTandem( 'labelsNode' )
+    } );
+    this.addChild( tickContainer );
 
     var thumbDimension = new Dimension2( options.thumbSize, options.thumbSize );
     // @private thumb node thermometer's slider
@@ -125,13 +127,15 @@ define( function( require ) {
 
     /**
      * Creates a labeled tick mark.
-     * @param {string} text
-     * @param {number} temperature
+     * @param {number} tickMarkIndex
      * @param {Object} options - options that were provided to BlackbodySpectrumThermometer constructor
      * @returns {Node}
      * @private
      */
-    createLabeledTick: function( text, temperature, options ) {
+    createLabeledTick: function( tickMarkIndex, options ) {
+      const text = TICK_MARKS[ tickMarkIndex ].text;
+      const temperature = TICK_MARKS[ tickMarkIndex ].temperature;
+
       var objectHeight = -this.temperatureToYPos( temperature );
       var tickMarkLength = options.tubeWidth * 0.5;
 
diff --git a/js/phet-io/blackbody-spectrum-phet-io-elements-baseline.js b/js/phet-io/blackbody-spectrum-phet-io-elements-baseline.js
index 725ac31..e9acf3a 100644
--- a/js/phet-io/blackbody-spectrum-phet-io-elements-baseline.js
+++ b/js/phet-io/blackbody-spectrum-phet-io-elements-baseline.js
@@ -1816,6 +1816,50 @@ window.phet.phetio.phetioElementsBaseline =
       "phetioStudioControl": true,
       "phetioTypeName": "PropertyIO.<BooleanIO>"
     },
+    "blackbodySpectrum.blackbodySpectrumScreen.view.thermometerNode.labelsNode": {
+      "phetioDocumentation": "",
+      "phetioEventType": "model",
+      "phetioFeatured": false,
+      "phetioHighFrequency": false,
+      "phetioPlayback": false,
+      "phetioReadOnly": false,
+      "phetioState": false,
+      "phetioStudioControl": true,
+      "phetioTypeName": "NodeIO"
+    },
+    "blackbodySpectrum.blackbodySpectrumScreen.view.thermometerNode.labelsNode.opacityProperty": {
+      "phetioDocumentation": "Opacity of the parent NodeIO, between 0 (invisible) and 1 (fully visible)",
+      "phetioEventType": "model",
+      "phetioFeatured": false,
+      "phetioHighFrequency": false,
+      "phetioPlayback": false,
+      "phetioReadOnly": false,
+      "phetioState": true,
+      "phetioStudioControl": true,
+      "phetioTypeName": "NumberPropertyIO"
+    },
+    "blackbodySpectrum.blackbodySpectrumScreen.view.thermometerNode.labelsNode.pickableProperty": {
+      "phetioDocumentation": "Sets whether the node will be pickable (and hence interactive), see the NodeIO documentation for more details",
+      "phetioEventType": "model",
+      "phetioFeatured": false,
+      "phetioHighFrequency": false,
+      "phetioPlayback": false,
+      "phetioReadOnly": false,
+      "phetioState": true,
+      "phetioStudioControl": true,
+      "phetioTypeName": "PropertyIO.<NullableIO.<BooleanIO>>"
+    },
+    "blackbodySpectrum.blackbodySpectrumScreen.view.thermometerNode.labelsNode.visibleProperty": {
+      "phetioDocumentation": "Controls whether the Node will be visible (and interactive), see the NodeIO documentation for more details.",
+      "phetioEventType": "model",
+      "phetioFeatured": false,
+      "phetioHighFrequency": false,
+      "phetioPlayback": false,
+      "phetioReadOnly": false,
+      "phetioState": true,
+      "phetioStudioControl": true,
+      "phetioTypeName": "PropertyIO.<BooleanIO>"
+    },
     "blackbodySpectrum.blackbodySpectrumScreen.view.thermometerNode.opacityProperty": {
       "phetioDocumentation": "Opacity of the parent NodeIO, between 0 (invisible) and 1 (fully visible)",
       "phetioEventType": "model",