only precess when in "Precession" mode, see #54

phetsims · Jan 4, 2025 · 81e48ae · 81e48ae
1 parent 08d8c5d
commit 81e48ae
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Showing 2 changed files with 11 additions and 4 deletions.
diff --git a/js/bloch-sphere/model/BlochSphereModel.ts b/js/bloch-sphere/model/BlochSphereModel.ts
@@ -148,9 +148,14 @@ export default class BlochSphereModel implements TModel {
       }
     );
 
-    this.magneticFieldStrengthProperty.link( magneticFieldStrength => {
-      this.singleMeasurementBlochSphere.rotatingSpeedProperty.value = magneticFieldStrength;
-    } );
+    Multilink.multilink(
+      [ this.magneticFieldStrengthProperty, this.selectedSceneProperty ],
+      ( magneticFieldStrength, selectedScene ) => {
+        this.singleMeasurementBlochSphere.rotatingSpeedProperty.value = selectedScene === BlochSphereScene.PRECESSION ?
+                                                                        magneticFieldStrength :
+                                                                        0;
+      }
+    );
 
     this.preparationBlochSphere.polarAngleProperty.link( polarAngle => {
       this.singleMeasurementBlochSphere.polarAngleProperty.value = polarAngle;

diff --git a/js/bloch-sphere/model/ComplexBlochSphere.ts b/js/bloch-sphere/model/ComplexBlochSphere.ts
@@ -46,7 +46,9 @@ export default class ComplexBlochSphere extends AbstractBlochSphere {
    * Abstract method that should run calculations to update the Bloch Sphere representation.
    */
   public override step( dt: number ): void {
-    this.azimuthalAngleProperty.value = Utils.moduloBetweenDown( this.azimuthalAngleProperty.value + this.rotatingSpeedProperty.value * dt, 0, 2 * Math.PI );
+    this.azimuthalAngleProperty.value = Utils.moduloBetweenDown(
+      this.azimuthalAngleProperty.value + this.rotatingSpeedProperty.value * dt, 0, 2 * Math.PI
+    );
   }
 
   public override reset(): void {