shape (version 1.1)

Arrowhead: adds arrowheads to a plot

Description

adds one or more arrowheads to a plot; shape is either curved, a triangle, a circle or simple

Usage

Arrowhead(x0, y0, angle=0, arr.length=0.4, arr.width=arr.length/2, 
  arr.adj=0.5, arr.type="curved", lcol="black", lty=1, arr.col=lcol, 
  npoint=5)

Arguments

x0

x-coordinates of points at which to draw arrowhead; either one value or a vector

y0

y-coordinates of points at which to draw arrowhead; either one value or a vector

angle

angle of arrowhead (anti-clockwise, relative to x-axis), in degrees [0,360]; either one value or a vector

arr.length

approximate length of arrowhead, in cm; either one value or a vector

arr.width

approximate width of arrowhead, in cm; either one value or a vector

arr.adj

0,0.5,1 specifying the adjustment of the arrowhead

arr.type

type of arrowhead to draw, one of "simple","curved","triangle","circle"

lcol

line color specifications; either one value or a vector

lty

line type specifications; either one value or a vector

arr.col

color of arrowhead; either one value or a vector

npoint

only if arr.type = "curved": number of points to draw the curve; increase for smoother arrowheads

Details

x0, y0, angle, arr.length, arr.width, lcol, lty and arr.col can be a vector, of the same length. \itemif arr.adj = 0.5, then the centre of the arrowhead is at the point at which it is drawn. \itemarr.adj = 1 causes the tip of the arrowhead to touch the point. \itemarr.adj = 0 causes the base of the arrowhead to touch the point. The type of the arrowhead is set with "arr.type" which can take the values: \item"simple" : uses comparable R function arrows \item"triangle": uses filled triangle \item"curved" : draws arrowhead with curved edges \item"circle" : draws circular head

See Also

Arrows

Examples

emptyplot(main="Arrowhead") 
  Arrowhead(x0=runif(10),y0=runif(10),angle=runif(10)*360,
  arr.length=0.3,arr.type="circle",arr.col="green")
  Arrowhead(x0=runif(10),y0=runif(10),angle=runif(10)*360,
  arr.length=0.4,arr.type="curved",arr.col="red")
  Arrowhead(x0=runif(10),y0=runif(10),angle=runif(10)*360,
  arr.length=runif(10),arr.type="triangle",arr.col=rainbow(10))