Changes in version 0.1.1.9000                      

  - Added the grob_arrow(offset) argument for drawing arrows at some
    offset.
  - Added the geom_arrow(sep) parameter, allowing co-located arrows to
    be dodged (#8).
  - New asymmetric arrow ornaments (#8):
      - arrow_head_halfline()
      - arrow_head_halfwing()

                 Changes in version 0.1.1 (2025-09-14)                  

This is a small release adapting to new features in ggplot2 4.0.0 and
fixing a bug.

  - Geom default have been adapted to the dynamic theming in
    ggplot2 4.0.0.
  - element_arrow() is implemented as an S7 class from ggplot2 4.0.0
    onwards.
  - Graphical properties are better preserved when arrows are forced
    (#9).

                 Changes in version 0.1.0 (2024-06-05)                  

Initial CRAN submission

Geom layers

Several geom functions:

  - geom_arrow() that works like geom_path().
  - geom_arrow_segment() that works like geom_segment()
  - geom_arrow_chain() that works like a type = "b" plot from base R.
  - geom_arrow_curve() that works like geom_curve().

Arrow grob

The function grob_arrow() creates a grid grob that largely mimics the
polylineGrob() grob, with the following differences.

  - Arrow ornaments can be placed at the end, start or middle of the
    line.
      - arrow_{head/fins/mid} controls the shape of the ornament.
      - length_{head/fins/mid} controls the size of the ornament.
      - justify controls where an ornament is placed relative to the
        line ends.
      - mid_place controls where middle (interior) arrows are placed.
      - resect{_head/_fins} can shorten the endpoints.
      - force_arrow determines if arrows are drawn on lines that are too
        short to accommodate ornaments.
  - The linewidth of the line can vary within a line.
      - shaft_width controls the linewidth for every point in x and y
  - A line can be shortened from their endpoints using the
    resect{_head/_fins} arguments.
  - The line is treated as a polygon, so fill controls the colour of the
    line, whereas colour controls the colour of an outline.

Arrow scales

The arrow_{head/fins/mid} have been promoted from parameters to
aesthetics. Correspondingly, there are now 3 discrete scales for these 3
aesthetics.

Arrow shapes

Added the following shapes for ornaments:

  - arrow_head_wings() that looks like a classic arrow.
  - arrow_head_line() that are two line protruding from the tip of the
    line.
  - arrow_head_minimal() that is just a stumpy line-end.
  - arrow_fins_feather() two stacked parallelograms.
  - arrow_fins_line() also two lines but in opposite direction.
  - arrow_fins_minimal() that is just a line-end with a triangle taken
    out.
  - arrow_cup() that forms an arc around a point.

Other

An annotate_arrow() layer to specifically do arrow annotations. An
element_arrow() to replace line elements in the theme() by arrows.