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ggarrow 0.1.0

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.

These binaries (installable software) and packages are in development.
They may not be fully stable and should be used with caution. We make no claims about them.