Fixed aspect ratios: coord_fixed

Mix.install([
  {:giggly, path: Path.join(__DIR__, "..")},
  {:kino, "~> 0.19"}
  ])

About this notebook

This notebook follows the examples on ggplot2's reference page for coord_fixed(), in the order the page gives them. Each example shows ggplot2's code first and then Giggly's. An example Giggly cannot draw yet keeps its ggplot2 code and names what it is waiting for, so the page is also a list of what remains.

coord_fixed() is Cartesian coordinates with a fixed ratio between the length of a unit on the y axis and the length of a unit on the x axis. The default, ratio = 1, makes a unit the same length on both axes; a larger ratio makes the y axis's units longer, a smaller one the x axis's. The ratio holds however the plot is resized. It takes coord_cartesian()'s options too, such as limits. Giggly draws in Cartesian coordinates, as ggplot2 does by default, but has no coord_fixed() yet.

Fixed ratios

# ensures that the ranges of axes are equal to the specified ratio by
# adjusting the plot aspect ratio

p <- ggplot(mtcars, aes(mpg, wt)) + geom_point()
p + coord_fixed(ratio = 1)
p + coord_fixed(ratio = 5)
p + coord_fixed(ratio = 1/5)

Not in Giggly yet: coord_fixed().

Limits with a fixed ratio

p + coord_fixed(xlim = c(15, 30))

# Resize the plot to see that the specified aspect ratio is maintained

Not in Giggly yet: coord_fixed(), and the xlim option it takes from coord_cartesian().