Extract arrow base or tip points — ps_arrow_vertices • potentiomap

Extract arrow base or tip points

Usage

ps_arrow_vertices(
  arrows,
  which = c("last", "first"),
  out_file = NULL,
  overwrite = TRUE
)

Arguments

arrows: A line SpatVector or path to a line vector file.
which: "first" for bases or "last" for tips.
out_file: Optional vector output path.
overwrite: Overwrite out_file when it exists.

Value

A point terra::SpatVector, including an empty point vector for zero arrows.

Examples

line <- terra::vect(list(rbind(c(0, 0), c(1, 1))), type = "lines",
                    crs = "EPSG:3857")
ps_arrow_vertices(line, "last")
#> class       : SpatVector
#> geometry    : points
#> dimensions  : 1, 0  (geometries, attributes)
#> extent      : 1, 1, 1, 1  (xmin, xmax, ymin, ymax)
#> coord. ref. : WGS 84 / Pseudo-Mercator (EPSG:3857)