# treearrow: adds a dendrogram-like branched arrow between several points In diagram: Functions for Visualising Simple Graphs (Networks), Plotting Flow Diagrams

## Description

connects two sets of points with a dendrogram-like structure,

adds an arrowhead at a certain distance.

## Usage

 ```1 2``` ```treearrow(from, to, lwd = 2, lty = 1, lcol = "black", arr.col = lcol, arr.side = 2, arr.pos = 0.5, line.pos = 0.5, path = "H", ...) ```

## Arguments

 `from ` matrix of coordinates (x,y) of points *from* which to draw arrow. `to ` matrix of coordinates (x,y) of points *to* which to draw arrow. `lwd ` line width. `lty ` line type. `lcol ` line color. `arr.col ` arrow color. `arr.side ` segment number on which arrowhead is drawn (1,2). `arr.pos ` relative position of arrowhead on segment on which arrowhead is drawn. `line.pos ` relative position of (horizontal/vertical) line. `path ` Vertical, Horizontal. `... ` other arguments passed to function straightarrow.

## Details

a tree-shaped arrow is drawn between points '(`from`, `to`)', where both `from` and `to` can be several points.

How the segments are drawn is set with `path` which can take on the values:

• "H": (horizontal): first left or right.

• "V": (vertical): first down- or upward.

The segment(s) on which the arrow head is drawn is set with `arr.side`, which is one or more values in (1, 2)

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

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` from package `shape` for details on arrow head.

## Value

coordinates (x,y) where arrowhead is drawn

## Author(s)

Karline Soetaert <[email protected]>

`straightarrow`, `segmentarrow`, `curvedarrow`, `selfarrow`, `bentarrow`, `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 18``` ```openplotmat(main = "treearrow") pos <- coordinates(c(3, 2, 4, 1)) treearrow(from = pos[1:5, ], to = pos[6:10, ]) for (i in 1:10) textrect(pos[i, ], lab = i, cex = 2, radx = 0.05) openplotmat(main = "treearrow") pos <- coordinates(c(2, 4), hor = FALSE) treearrow(from = pos[1:2, ], to = pos[3:6, ], arr.side = 1:2, path = "V") for (i in 1:6) textrect(pos[i, ], lab = i, cex = 2, radx = 0.05) openplotmat(main = "treearrow") pos <- coordinates(c(3, 5, 7, 7, 5, 3)) treearrow(from = pos[1:15, ], to = pos[15:30, ], arr.side = 0) for (i in 1:30) textrect(pos[i, ], lab = i, cex = 1.2, radx = 0.025) ```

diagram documentation built on May 31, 2017, 2:44 a.m.