Tissot's indicatrix — bt_tissot • bertin

Tissot's indicatrix

Usage

bt_tissot(
  bertin,
  step = 20,
  fill = "#d91848",
  fillOpacity = 0.5,
  stroke = "white",
  strokeWidth = 1.5,
  strokeOpacity = 1,
  display = TRUE
)

Arguments

bertin: map object
step: gap between graticules. The value can be a number or an array of two values
fill: fill color
fillOpacity: fill opacity
stroke: stroke color
strokeWidth: stroke width
strokeOpacity: stroke opacity
display: Boolean to allow to show or hide the layer. This parameter has no effect on the calculation of the extent

Value

map object

Examples

library(sf)
world <- st_read(system.file("gpkg/world.gpkg", package = "bertin"),
                 layer = "world", quiet = TRUE)
bt_param(projection = "Robinson", clip = TRUE) |>
  bt_outline() |>
  bt_layer(data = world, fill = "white", fillOpacity = .35) |>
  bt_tissot(step = 20) |>
  bt_draw()