gplot.vertex {sna} | R Documentation

## Add Vertices to a Plot

### Description

`gplot.vertex` adds one or more vertices (drawn using `polygon`) to a plot.

### Usage

    gplot.vertex(x, y, radius = 1, sides = 4, border = 1, col = 2,
        lty = NULL, rot = 0, ...)

### Arguments

`x` | a vector of x coordinates.
`y` | a vector of y coordinates.
`radius` | a vector of vertex radii.
`sides` | a vector containing the number of sides to draw for each vertex.
`border` | a vector of vertex border colors.
`col` | a vector of vertex interior colors.
`lty` | a vector of vertex border line types.
`rot` | a vector of vertex rotation angles (in degrees).
`...` | Additional arguments to `polygon`

### Details

`gplot.vertex` draws regular polygons of specified radius and number of sides, at the given coordinates. This is useful for routines such as `gplot`, which use such shapes to depict vertices.

### Value

None

### Author(s)

Carter T. Butts buttsc@uci.edu

### See Also

`gplot`, `polygon`

### Examples

    #Open a plot window, and place some vertices
    plot(0,0,type="n",xlim=c(-1.5,1.5),ylim=c(-1.5,1.5),asp=1)
    gplot.vertex(cos((1:10)/10*2*pi),sin((1:10)/10*2*pi),col=1:10,
        sides=3:12,radius=0.1)

[Package sna version 1.1 Index]