dagR: smoothArc – R documentation

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smoothArc

Draw an undirected assocation in a DAG.

Description

This draws a dashed connection between two points, curving it so that it goes through a third point. This is internally used by dag.draw to draw associations.

Usage

smoothArc(A, B, C, res = 20, gap = 0.05, p = FALSE)

Arguments

`A`	Vector of length 2, providing xy coordinates of first point.
`B`	Vector of length 2, providing xy coordinates of second point.
`C`	Vector of length 2, indicating xy coordinates through which the association should be curved.
`res`	How smooth should the curve be drawn?
`gap`	How far from point A and B should the line end?
`p`	If TRUE, the point through which the curve goes is drawn (this is to allow better moving it with `dag.move`).

Note

In the version 1.0.1 distributed as online supplemental material with Breitling (2010), the function contains arbitrary default values used during development.

Author(s)

Lutz P Breitling <l.breitling@posteo.de>

References

Breitling LP (2010). dagR: a suite of R functions for directed acyclic graphs. Epidemiology 21(4):586-587.

Examples

dag.draw(demo.dag1());
smoothArc(c(0.5,0.5), c(1,1), c(0.75,0.6), p=TRUE);
smoothArc(c(0.5,0.5), c(1,1), c(0.65,0.6), p=TRUE);
smoothArc(c(0.5,0.5), c(1,1), c(0.55,0.6), p=TRUE);
smoothArc(c(0.5,0.5), c(1,1), c(0.45,0.6), p=TRUE);

dagR

R Functions for Directed Acyclic Graphs

v1.2.0

GPL-2

Authors

Lutz P Breitling

Initial release

2021-04-17