reset concentration alerter when rest of sim is reset, see #176

js/common/view/GasConcentrationAlerter.ts

@@ -50,6 +50,9 @@ const DATE_CHANGE_UTTERANCE_OPTIONS = {
 
 class GasConcentrationAlerter extends Alerter {
 
+  // reference to the model, used in the methods
+  private readonly model: ConcentrationModel;
+
   // Time that has passed since last alert, when this equals ALERT_INTERVAL, a new alert is sent the UtteranceQueue.
   private timeSinceLastAlert: number;
 
@@ -77,8 +80,6 @@ class GasConcentrationAlerter extends Alerter {
   private netEnergyProperty: IReadOnlyProperty<number>;
   private previousNetInflowOfEnergy: number;
 
-  private model: ConcentrationModel;
-
   public constructor( model: ConcentrationModel, providedOptions?: AlerterOptions ) {
 
     const options = optionize<AlerterOptions, EmptyObjectType, AlerterOptions>()( {
@@ -89,6 +90,7 @@ class GasConcentrationAlerter extends Alerter {
 
     super( options );
 
+    this.model = model;
     this.useVerboseSurfaceTemperatureAlert = true;
     this.temperatureChangeAlertCount = 0;
     this.timeSinceLastAlert = 0;
@@ -276,6 +278,16 @@ class GasConcentrationAlerter extends Alerter {
       this.timeSinceLastAlert = 0;
     }
   }
+
+  /**
+   * Reset this to its initial state.  For this to work properly, the model must be reset prior to calling this method.
+   */
+  public reset(): void {
+    this.temperatureChangeAlertCount = 0;
+    this.timeSinceLastAlert = 0;
+    this.previousNetInflowOfEnergy = this.model.netInflowOfEnergyProperty.value;
+    this.previousConcentration = this.model.concentrationProperty.value;
+  }
 }
 
 greenhouseEffect.register( 'GasConcentrationAlerter', GasConcentrationAlerter );

js/common/view/GreenhouseEffectObservationWindow.ts

@@ -481,6 +481,10 @@ class GreenhouseEffectObservationWindow extends Node {
     // Does nothing in the base class, override as necessary in subclasses.
   }
 
+  public reset(): void {
+    // Does nothing in the base class, override as necessary in subclasses.
+  }
+
   // static values
   public static SIZE: Dimension2 = SIZE;
   public static CONTROL_AND_INSTRUMENT_INSET: number = CONTROL_AND_INSTRUMENT_INSET;

js/common/view/LandscapeObservationWindow.ts

@@ -190,6 +190,10 @@ class LandscapeObservationWindow extends GreenhouseEffectObservationWindow {
   public override step( dt: number ): void {
     this.gasConcentrationAlerter.step( dt );
   }
+
+  public override reset(): void {
+    this.gasConcentrationAlerter.reset();
+  }
 }
 
 greenhouseEffect.register( 'LandscapeObservationWindow', LandscapeObservationWindow );

js/waves/view/WavesScreenView.ts

@@ -313,6 +313,7 @@ class WavesScreenView extends GreenhouseEffectScreenView {
 
   public override reset(): void {
     super.reset();
+    this.observationWindow.reset();
   }
 }