Last data update: 2014.03.03
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R: adds arrowheads to a plot
adds arrowheads to a plot
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.
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y0 |
y-coordinates of points at which to draw arrowhead;
either one value or a vector.
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angle |
angle of arrowhead (anti-clockwise, relative to x-axis),
in degrees [0,360]; either one value or a vector.
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arr.length |
approximate length of arrowhead, in cm;
either one value or a vector.
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arr.width |
approximate width of arrowhead, in cm;
either one value or a vector.
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arr.adj |
0,0.5,1 specifying the adjustment of the arrowhead.
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arr.type |
type of arrowhead to draw, one of
"curved","triangle","circle","ellipse".
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lcol |
line color specifications; either one value or a vector.
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lty |
line type specifications; either one value or a vector.
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arr.col |
color of arrowhead; either one value or a vector.
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arr.lwd |
line width of arrowhead.
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npoint |
only if arr.type = "curved": number of points to
draw the curve; increase for smoother arrowheads
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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.
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arr.adj = 1 causes the tip of the arrowhead to
touch the point.
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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 <karline.soetaert@nioz.nl>
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))
Results
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