remove getParticleAtom, fixes #153

js/chart-intro/model/ChartIntroModel.ts

@@ -140,13 +140,6 @@ class ChartIntroModel extends BANModel<ParticleNucleus> {
     // count it in a shell position).
     this.particleAtom.removeParticleFromShell && this.particleAtom.removeParticleFromShell( particle );
   }
-
-  /**
-   * Return the model of the cluster of mini-particles.
-   */
-  public override getParticleAtom(): ParticleAtom {
-    return this.miniParticleAtom;
-  }
 }
 
 buildANucleus.register( 'ChartIntroModel', ChartIntroModel );

js/chart-intro/view/ChartIntroScreenView.ts

@@ -348,7 +348,7 @@ class ChartIntroScreenView extends BANScreenView<ChartIntroModel> {
     this.isMiniAtomConnected = false;
 
     // animate mini particle atom
-    const alphaParticle = super.emitAlphaParticle();
+    const alphaParticle = super.emitAlphaParticle( this.model.miniParticleAtom );
     this.model.miniParticleAtom.reconfigureNucleus();
 
     // animate nucleons in NucleonShellView
@@ -368,7 +368,7 @@ class ChartIntroScreenView extends BANScreenView<ChartIntroModel> {
 
     // animate mini particleAtom
     const nucleonTypeToChange = betaDecayType === DecayType.BETA_MINUS_DECAY ? ParticleType.NEUTRON : ParticleType.PROTON;
-    const particleToEmit = super.betaDecay( betaDecayType );
+    const particleToEmit = super.betaDecay( betaDecayType, this.model.miniParticleAtom );
     this.createMiniParticleView( particleToEmit );
 
     // animate the shell view

js/common/model/BANModel.ts

@@ -240,17 +240,8 @@ class BANModel<T extends ParticleAtom> {
     particle.animationEndedEmitter.removeAllListeners();
   }
 
-  /**
-   * Return the model of the cluster of nucleons, which is the main model in the Decay Screen and the mini nucleus in
-   * the Chart Screen.
-   */
-  public getParticleAtom(): ParticleAtom {
-    return this.particleAtom;
-  }
-
-
-// 2D array that defines the table structure.
-// The rows are the proton number, for example the first row is protonNumber = 0. The numbers in the rows are the neutron number.
+  // 2D array that defines the table structure.
+  // The rows are the proton number, for example the first row is protonNumber = 0. The numbers in the rows are the neutron number.
   public static readonly POPULATED_CELLS = [
     [ 1, 4, 6 ],
     [ 0, 1, 2, 3, 4, 5, 6 ],

js/common/view/BANScreenView.ts

@@ -583,8 +583,6 @@ abstract class BANScreenView<M extends BANModel<ParticleAtom | ParticleNucleus>>
       this.model.removeParticle( particle );
     }
     else {
-      // Remove particles flying away from the mini-nucleus. Dispose emitter deals with the view portion.
-      assert && assert( !this.model.getParticleAtom().containsParticle( particle ), 'Particle is a decaying particle so it should not be a part of the miniParticleAtom.' );
       particle.dispose();
     }
   }
@@ -759,8 +757,7 @@ abstract class BANScreenView<M extends BANModel<ParticleAtom | ParticleNucleus>>
    * Creates an alpha particle by removing the needed nucleons from the nucleus, arranging them, and then animates the
    * particle out of view.
    */
-  protected emitAlphaParticle(): AlphaParticle {
-    const particleAtom = this.model.getParticleAtom();
+  protected emitAlphaParticle( particleAtom: ParticleAtom = this.model.particleAtom ): AlphaParticle {
     assert && assert( this.model.particleAtom.protonCountProperty.value >= AlphaParticle.NUMBER_OF_ALLOWED_PROTONS &&
     this.model.particleAtom.neutronCountProperty.value >= AlphaParticle.NUMBER_OF_ALLOWED_NEUTRONS,
       'The particleAtom needs 2 protons and 2 neutrons to emit an alpha particle.' );
@@ -796,8 +793,8 @@ abstract class BANScreenView<M extends BANModel<ParticleAtom | ParticleNucleus>>
   /**
    * Changes the nucleon type of a particle in the atom and emits an electron or positron from behind that particle.
    */
-  protected betaDecay( betaDecayType: DecayType ): Particle {
-    const particleAtom = this.model.getParticleAtom();
+  protected betaDecay( betaDecayType: DecayType, particleAtom: ParticleAtom = this.model.particleAtom ): Particle {
+    console.log( particleAtom );
     let particleArray;
     let particleToEmit: Particle;
     if ( betaDecayType === DecayType.BETA_MINUS_DECAY ) {