# 6 Data Visualization with Makie.jl

From the japanese word Maki-e, which is a technique to sprinkle lacquer with gold and silver powder. Data is the gold and silver of our age, so let’s spread it out beautifully on the screen!

Simon Danisch, Creator of Makie.jl

Makie.jl is a high-performance, extendable, and multi-platform plotting ecosystem for the Julia programming language. In our opinion, it is the prettiest and most versatile plotting package.

Makie.jl is the frontend package that defines all plotting functions. It is reexported by every backend (the machinery behind-the-scenes making the figure), so you don’t have to specifically install or import it. There are three main backends which concretely implement all abstract rendering capabilities defined in Makie. One for non-interactive 2D publication-quality vector graphics: CairoMakie.jl. Another for interactive 2D and 3D plotting in standalone GLFW.jl windows (also GPU-powered), GLMakie.jl. And the third one, a WebGL-based interactive 2D and 3D plotting that runs within browsers, WGLMakie.jl. See Makie’s documentation for more.

In this book we will only show examples for CairoMakie.jl and GLMakie.jl.

You can activate any backend by using the appropriate package and calling its activate! function. For example:

using GLMakie
GLMakie.activate!()

Now, we will start with publication-quality plots. But, before going into plotting it is important to know how to save our plots. The easiest option to save a figure fig is to type save("filename.png", fig). Other formats are also available for CairoMakie.jl, such as svg and pdf. Regarding the resolution output, this one can be easily scale by calling extra arguments. For vector formats you specify pt_per_unit, e.g.

save("filename.pdf", fig; pt_per_unit = 2)

or

save("filename.pdf", fig; pt_per_unit = 0.5)

to scale up or down respectively. For png’s you specify px_per_unit, also scaling up or down as previously mentioned. For a complete overview please visit Backends & Output in the official documentation.

DRAFT - CC BY-NC-SA 4.0 Jose Storopoli, Rik Huijzer, Lazaro Alonso