# selfarrow: adds a circular, self-pointing arrow to a plot In diagram: Functions for Visualising Simple Graphs (Networks), Plotting Flow Diagrams

## Description

adds a circular arrow, from and to the same point

## Usage

 ```1 2``` ```selfarrow(pos, lwd = 2, lty = 1, lcol = "black", arr.pos = 0.5, path = "L", curve = c(0.1, 0.1), dr = 0.01, code = 1, ...) ```

## Arguments

 `pos ` 2-valued vector with coordinates (x,y) of points *from and to* which to draw arrow. `lwd ` line width. `lty ` line type. `lcol ` line color. `arr.pos ` relative position of arrowhead. `path ` position of circle: R, L, U, D for right, left, up and down respectively. `curve ` relative size of curve (fraction of arrow length). `dr ` size of segments, in radians, to draw ellipse (decrease for smoother). `code ` how to put the arrowhead. `... ` arguments passed to function Arrows.

## Details

draws a circular arrow from and to one point

The position of the arrowhead on the circle is set with `arr.pos`, a value between 0 (at start) and 1(at end of circle)

The type of the arrowhead is set with `arr.type` which can take the values:

• "simple" : uses comparable R function arrows.

• "triangle": uses filled triangle.

• "curved" : draws arrowhead with curved edges.

• "circle" : draws circular head.

• "ellipse" : draws ellepsoid head

• "T" : draws T-shaped (blunt) head

see `Arrowhead` for details on arrow head.

## Value

coordinates (x,y) where arrowhead is drawn

## Author(s)

Karline Soetaert <[email protected]>

`straightarrow`, `segmentarrow`, `curvedarrow`, `bentarrow`,`treearrow`, `splitarrow`,

`arrows`: the comparable R function,

`Arrows`: more complicated arrow function from package shape.

## Examples

 ``` 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17``` ```openplotmat(main = "selfarrow") pos <- coordinates(3, mx = 0.05) text(pos, LETTERS[1:3], cex = 2) for (i in 1:3) selfarrow(pos = pos[i, ], path = "R", arr.pos = 0.2, curve = c(0.05, 0.1), lcol = "darkred") for (i in 1:3) selfarrow(pos = pos[i, ], path = "L", arr.pos = 0.7, lcol = "darkblue", curve = c(0.05, 0.05)) for (i in 1:3) selfarrow(pos = pos[i, ], path = "L", arr.pos = 0.5, lcol = "darkgreen", code = i, arr.type = "triangle") ```

### Example output

```Loading required package: shape
```

diagram documentation built on Aug. 16, 2017, 5:04 p.m.