Plot an arrow

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Description

It plots a polygon arrow subject to criteria concerning position, length, width, direction and color.

In plots of the cross-wavelet power (or wavelet coherency) spectrum of two time series as performed by function wc.image, arrows are used as a symbolic indicator of phase-differences between the series in the time/frequency domain.

This code has been developed by Huidong Tian (archived R package WaveletCo).

Usage

1
arrow(x, y, l = 0.1, w = 0.3*l, alpha, col.arrow = 'black')

Arguments

x

the x coordinate of the center of the arrow.

y

the y coordinate of the center of arrow.

l

the length of arrow. Default: 0.1.

w

the width of arrow. Default: 0.3*l.

alpha

the direction of the arrow, range from 0 to 2*pi.

col.arrow

color of arrows. Default: "black".

Author(s)

Code developed by Huidong Tian.

References

Tian, H., and Cazelles, B., 2012. WaveletCo. Available at http://cran.r-project.org/src/contrib/Archive/WaveletCo/, archived April 2013; accessed July 26, 2013.

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