Arrowhead: adds arrowheads to a plot

In shape: Functions for Plotting Graphical Shapes, Colors

Description

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

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, arr.lwd = 2, 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 "curved", "triangle", "circle", "ellipse".
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.
arr.lwd	line width of arrowhead.
npoint	only if arr.type = "curved": number of points to draw the curve; increase for smoother arrowheads
...	arguments passed to the polygon function.

Details

x0, y0, angle, arr.length, arr.width, lcol, lty and arr.col can be a vector, of the same length.

• if arr.adj = 0.5, then the centre of the arrowhead is at the point at which it is drawn.

• arr.adj = 1 causes the tip of the arrowhead to touch the point.

• arr.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:

• "triangle": uses filled triangle

• "curved" : draws arrowhead with curved edges

• "circle" : draws circular head (where arr.width=arr.length)

• "ellipse" : draws ellipsoid head

Author(s)

Karline Soetaert <[e-mail]>

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))

Example output

shape documentation built on May 19, 2021, 9:09 a.m.