Drawing Layers

A AlgebraOfGraphics.Layer or AlgebraOfGraphics.Layers object can be plotted using the functions draw or draw!.

Whereas draw automatically adds colorbar and legend, draw! does not, as it would be hard to infer a good default placement that works in all scenarios.

Colorbar and legend, should they be necessary, can be added separately with the colorbar! and legend! helper functions. See also Nested layouts for a complex example.