examples.md

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This issue is to collect all of the sim-specific things that should be mentioned in examples.md.

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• From Should wavelength values be integers? #53, mention that wavelengths are integer values, as a simplification.

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Related to #90 ...

• Mention that if radio buttons under modelRadioButtonGroup are hidden, then you should also consider hiding continuumBarNode.

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Related to PhET-iO instrumentation of Spectrometer snapshots...

Model:

Snapshots are model.spectrometer.snapshots and they are of type ObservableArray<SpectrometerSnapshotIO>. The value of an ObservableArray cannot be displayed in Studio. So if you want to get the snapshots, you can use the getPhetioElementState command in the browser console. For example:

await phetioClient.invokeAsync( 'phetioEngine', 'getPhetioElementState', [ 'modelsOfTheHydrogenAtom.spectraScreen.model.spectrometer.snapshots' ] )

View:

The snapshots dialog is capable of displaying 4 snapshots. The elements that display these snapshots are referred to as "snapshot nodes" and they have tandem names 'snapshotNode0', 'snapshotNode1', 'snapshotNode2', and 'snapshotNode3'. They appear in the dialog from top to bottom - 'snapshotNode0' is always the top snapshot, 'snapshotNode3' is always the bottom snapshot. The numbers in the tandem name do not correspond to the snapshot numbers shown in the user interface. When you delete a snapshot (by pushing the trash button) the snapshots that remain are reloaded into the snapshot nodes, and the snapshot nodes that do not have associated snapshots become invisible.