Create a sketchy arrow grob

Draws one or more hand-drawn arrows. The shaft is a quadratic Bezier (so it can curve) and the arrowhead is roughened and oriented to the curve's end tangent, both assembled in device inches so the head stays crisp and correctly angled on any panel shape. The arrowhead size can adapt to the shaft length.

Usage

sketch_arrow_grob(
  x0,
  y0,
  cx,
  cy,
  x1,
  y1,
  roughness = 1,
  bowing = 1,
  n_passes = 2L,
  seed = NULL,
  arrow_length = NULL,
  arrow_angle = 25,
  arrow_type = "open",
  arrow_head = NULL,
  ends = "last",
  gp = gpar(),
  name = NULL,
  vp = NULL
)

Arguments

x0, y0

Shaft start in npc [0,1] (vectors, one per arrow).

cx, cy

Quadratic-Bezier control point in npc (vectors). For a straight arrow pass the chord midpoint.

x1, y1

Shaft end / arrow tip in npc (vectors).

roughness, bowing, n_passes, seed

Sketch parameters.

arrow_length

Arrowhead length in inches. NULL (default) adapts it to the shaft length.

arrow_angle

Half-angle of the arrowhead in degrees. Default 25.

arrow_type

"open" (default) draws a two-stroke V; "closed" draws a filled rough triangle. Superseded by arrow_head; kept for back-compat.

arrow_head

Head style, one of sketch_arrowheads() ("triangle_open", "triangle_filled", "barb", "fishtail", "dot", "bar"). NULL (default) derives it from arrow_type.

ends

Which end(s) carry a head: "last" (default), "first", or "both".

gp

A grid::gpar() for the strokes (per-arrow col recycled).

name, vp

Passed to grid::gTree().

Value

A SketchArrowGrob grob subclass.

See also

Other grob-layer: sketch_band_grob(), sketch_callout_grob(), sketch_dotplot_grob(), sketch_ellipse_grob(), sketch_engrave_grob(), sketch_path_grob(), sketch_polygon_grob(), sketch_repel_grob(), sketch_spray_grob(), sketch_stroke_grob(), sketch_wedge_grob()