Arrowheads

Describe arrowheads to draw on the ends of a lines_grob() or segments_grob() (pass as their arrow = argument).

Usage

vl_arrow(
  angle = 30,
  length = vl_unit(0.25, "in"),
  ends = c("last", "first", "both"),
  type = c("open", "closed")
)

Arguments

angle

Half-angle of the head at the tip, in degrees (default 30).

length

Head length as an absolute vl_unit() (default vl_unit(0.25, "in")).

ends

Which ends get a head: "last" (default), "first", or "both".

type

"open" (a two-barb V) or "closed" (a filled triangle).

Value

A vellum_arrow object.

Examples

lines_grob(c(0.1, 0.9), c(0.1, 0.9), arrow = vl_arrow(type = "closed"))
#> <vellum::grob_lines>
#>  @ name     : NULL
#>  @ gp       : <vellum::vl_gpar>
#>  .. @ col       : NULL
#>  .. @ fill      : NULL
#>  .. @ lwd       : NULL
#>  .. @ alpha     : NULL
#>  .. @ lty       : NULL
#>  .. @ lineend   : NULL
#>  .. @ linejoin  : NULL
#>  .. @ linemitre : NULL
#>  .. @ fontfamily: NULL
#>  .. @ fontface  : NULL
#>  .. @ fontsize  : NULL
#>  .. @ lineheight: NULL
#>  @ vp       : NULL
#>  @ id       : NULL
#>  @ role     : NULL
#>  @ keys     : NULL
#>  @ meta     : NULL
#>  @ x        : unit [1:2] 0.1native, 0.9native
#>  @ y        : unit [1:2] 0.1native, 0.9native
#>  @ arrow    :List of 4
#>  .. $ angle : num 30
#>  .. $ length: unit [1:1] 0.25in
#>  .. $ ends  : chr "last"
#>  .. $ type  : chr "closed"
#>  .. - attr(*, "class")= chr "vellum_arrow"
#>  @ start_cap: NULL
#>  @ end_cap  : NULL
#>  @ offset   : NULL
#>  @ sketch   : NULL