arrow                  package:grid                  R Documentation

Describe arrows to add to a line.

Description:

     Produces a description of what arrows to add to a line. The result
     can be passed to a function that draws a line, e.g., 'grid.lines'.

Usage:

     arrow(angle = 30, length = unit(0.25, "inches"),
           ends = "last", type = "open")

Arguments:

   angle: The angle of the arrow head in degrees (smaller numbers
          produce narrower, pointier arrows).  Essentially describes
          the width of the arrow head.

  length: A unit specifying the length of the arrow head (from tip to
          base).

    ends: One of '"last"', '"first"', or '"both"', indicating which
          ends of the line to draw arrow heads.

    type: One of '"open"' or '"closed"' indicating whether the arrow
          head should be a closed triangle.

Examples:

     arrow()

