Random visualizations

We can switch between visualizations by adding and removing them over time. In the following example, we start with one active visualization and then every few seconds, toggle a random visualization on or off.

First, add an activate method to the abstract Visualization class, which takes a Boolean enabled parameter. The Boolean active variable is read-only:

    public boolean active = true;
    public abstract void activate(boolean enabled);

Its implementation will depend on the specific visualization. RenderBox library provides an enabled flag that's used when we render objects. The ones that instantiate a single Plane component are the easiest, such as WaveformVisualization and FFTVisualization. To each of these, add the following code:

    @Override
    public void activate(boolean enabled) {
        active = enabled;
        plane.enabled = enabled;
    }

For the GeometricVisualization class, we can enable (and disable) each of the component cubes:

    @Override...