# plotArrows

From geosphere v1.5-10
by Robert Hijmans

##### Plot

Plot polygons with arrow heads on each line segment, pointing towards the next vertex. This shows the direction of each line segment.

##### Usage

`plotArrows(p, fraction=0.9, length=0.15, first='', add=FALSE, ...)`

##### Arguments

- p
Polygons (either a 2 column matrix or data.frame; or a SpatialPolygons* object

- fraction
numeric between 0 and 1. When smaller then 1, interrupted lines are drawn

- length
length of the edges of the arrow head (in inches)

- first
Character to plot on first (and last) vertex

- add
Logical. If

`TRUE`

, the plot is added to an existing plot- ...
Additional arguments, see Details

##### Note

Based on an example in Software for Data Analysis by John Chambers (pp 250-251) but adjusted such that the line segments follow great circles between vertices.

##### Examples

```
# NOT RUN {
pol <- rbind(c(-180,-20), c(-160,5), c(-60, 0), c(-160,-60), c(-180,-20))
plotArrows(pol)
# }
```

*Documentation reproduced from package geosphere, version 1.5-10, License: GPL (>= 3)*

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