pieGrob {PieGlyph}

Create pie-chart glyph

Description

This function creates a pie-chart glyph. The proportions of the different slices are calculated automatically using the numbers in the values parameter.

Usage

pieGrob(
  x = 0.5,
  y = 0.5,
  values,
  radius = 1,
  radius_unit = "cm",
  edges = 360,
  col = "black",
  fill = NA,
  lwd = 1,
  lty = 1,
  alpha = 1,
  default.units = "npc"
)

Arguments

x

A number or unit object specifying x-location of pie chart

y

A number or unit object specifying y-location of pie chart

values

A numeric vector specifying the values of the different slices of the pie chart

radius

A number specifying the radius of the pie-chart

radius_unit

Character string specifying the unit for the radius of the pie-chart

edges

Number of edges which make up the circumference of the pie-chart (Increase for higher resolution)

col

Character specifying the colour of the border between the pie slices

fill

A character vector specifying the colour of the individual slices

lwd

Line width of the pie borders

lty

Linetype of the pie borders

alpha

Number between 0 and 1 specifying the opacity of the pie-charts

default.units

Change the default units for the position and radius of the pie-glyphs

Value

A grob object

Examples

library(grid)
grid.newpage()
p1 <- pieGrob(x = 0.2, y= 0.2,
              values = c(.7,.1,.1,.1), radius = 1,
              fill = c('purple','red','green','orange'))
grid.draw(p1)

## Change unit of radius
grid.newpage()
p2 <- pieGrob(x = 0.5, y= 0.75,
              values = c(1,2,3,4,5), radius = 1,
              radius_unit = 'in',
              fill = c('purple','yellow','green','orange','blue'))
grid.draw(p2)

## Change border attributes
grid.newpage()
p3 <- pieGrob(x = 0.5, y= 0.5,
              values = c(10, 40, 50), radius = 20,
              radius_unit = 'mm',
              col = 'red', lwd = 5, lty = 3,
              fill = c('purple','yellow','blue'))
grid.draw(p3)