arrow: Find coords for plotting horizontal arrows

In sherrillmix/dnar: Miscellaneous functions to deal with bioinformatic analyses

Find coords for plotting horizontal arrows

Description

Find coords for plotting horizontal arrows

Usage

arrow(
  tail,
  head,
  y,
  arrowLength = diff(graphics::par("usr")[1:2]) * 0.05,
  shaft = 0.2,
  point = 0.4,
  concat = TRUE
)

Arguments

tail	x coordinate for tail of the arrow
head	x coordinate for the head of the arrow
y	y position for middle of block
arrowLength	arrow length in usr coords
shaft	half of shaft thickness in usr coords
point	half of arrow thickness in usr coords
concat	logical indicating whether to concatenate multiple arrows into one data frame separated by NAs (e.g. ready for poly)

Value

a data.frame with columns x and y specifying coordinates for arrows

Examples

plot(1:10)
polygon(arrow(1:5,3:7*1.5,2:6))
polygon(arrow(3:6,1:4/1.5,7:10))
polygon(arrow(7:10,7:10+0:3*.1,7:10))
polygon(arrow(6:9,6:9-0:3*.1,7:10))

sherrillmix/dnar documentation built on July 18, 2022, 10:07 p.m.