Interactive and reactive plots with Makie

Makie—in particular, its GLMakie backend—was designed to be interactive. Makie builds its interactivity around the Observables package. For example, Makie arguments and attributes can be observables, so the plot automatically reacts to their changes. What is more, Makie extends Observables to make actions helpful in creating more straightforward interactive visualizations. In this section, through an example, we will learn how to create a simple interactive plot while exploiting the tools offered by Makie. We will plot an arc with GLMakie using a slider to choose the internal angle value. Proceed as follows:

1. Open the Julia REPL on a terminal and execute using GLMakie, to use Makie and its Open Graphics Library (OpenGL) backend. Depending on your machine or the need for precompilation, this step and the following two can take some time.
2. Execute fig = Figure() to create a new figure. The Figure objects of Makie contain...