# Using pie charts as vertices in graph plots

`vertex.shape.pie.Rd`

More complex vertex images can be used to express addtional information about vertices. E.g. pie charts can be used as vertices, to denote vertex classes, fuzzy classification of vertices, etc.

## Details

The vertex shape ‘pie’ makes igraph draw a pie chart for every vertex. There are some extra graphical vertex parameters that specify how the pie charts will look like:

- pie
Numeric vector, gives the sizes of the pie slices.

- pie.color
A list of color vectors to use for the pies. If it is a list of a single vector, then this is used for all pies. It the color vector is shorter than the number of areas in a pie, then it is recycled.

- pie.angle
The slope of shading lines, given as an angle in degrees (counter-clockwise).

- pie.density
The density of the shading lines, in lines per inch. Non-positive values inhibit the drawing of shading lines.

- pie.lty
The line type of the border of the slices.

## Author

Gabor Csardi csardi.gabor@gmail.com

## Examples

```
g <- make_ring(10)
values <- lapply(1:10, function(x) sample(1:10,3))
if (interactive()) {
plot(g, vertex.shape="pie", vertex.pie=values,
vertex.pie.color=list(heat.colors(5)),
vertex.size=seq(10,30,length.out=10), vertex.label=NA)
}
```