selfarrow {diagram}R Documentation

adds a circular, self-pointing arrow to a plot

Description

adds a circular arrow, from and to the same point

Usage

selfarrow(pos, lwd=2, lty=1, lcol="black", arr.pos=0.5, 
  path="L", curve=c(0.1,0.1), dr=0.01, code=1, ...)

Arguments

pos 2-valued vector with coordinates (x,y) of points *from and to* which to draw arrow
lwd line width
lty line type
lcol line color
arr.pos relative position of arrowhead
path position of circle: R, L, U, D for right, left, up and down respectively
curve relative size of curve (fraction of arrow length)
dr size of segments, in radians, to draw ellipse (decrease for smoother)
code how to put the arrowhead
... arguments passed to function Arrows

Details

draws a circular arrow from and to one point

The position of the arrowhead on the circle is set with arr.pos, a value between 0 (at start) and 1(at end of circle)

The type of the arrowhead is set with "arr.type" which can take the values:

see Arrowhead for details on arrow head

Value

coordinates (x,y) where arrowhead is drawn

Author(s)

Karline Soetaert <k.soetaert@nioo.knaw.nl>

See Also

straightarrow,segmentarrowcurvedarrow, bentarrow,treearrow, splitarrow, arrows: the comparable R function, Arrows: more complicated arrow function from package shape

Examples

  openplotmat(main="selfarrow")
  pos <- coordinates(3,mx=0.05)
  text(pos,LETTERS[1:3],cex=2)
  for (i in 1:3) selfarrow(pos=pos[i,],path="R",arr.pos=0.2,
                           curve=c(0.05,0.1), lcol="darkred")
  for (i in 1:3) selfarrow(pos=pos[i,],path="L",arr.pos=0.7,
                           lcol="darkblue", curve=c(0.05,0.05))
  for (i in 1:3) selfarrow(pos=pos[i,],path="L",arr.pos=0.5,
                           lcol="darkgreen", code=i)

[Package diagram version 1.3.1 Index]