pie3D: Display a 3D pie chart

Description

Displays a 3D pie chart with optional labels.

Usage

pie3D(x,edges=100,radius=1,height=0.3,theta=pi/6,start=0,border=par("fg"),
  col=NULL,labels=NULL,labelpos=NULL,labelcol=par("fg"),labelcex=1.5,
  sector.order=NULL,explode=0,shade=0.8,...)

Arguments

a numeric vector for which each value will be a sector

edges

the number of lines forming an ellipse

radius

the radius of the pie in user units

height

the height of the pie in user units

theta

The angle of viewing in radians

start

The angle at which to start drawing sectors.

border

The color of the sector border lines

col

The colors of the sectors

labels

Optional labels for each sector

labelpos

Optional positions for the labels

labelcol

The color of the labels

labelcex

The character expansion factor for the labels

sector.order

Allows the operator to specify the order in which the sectors are drawn.

explode

The amount to "explode" the pie in user units

shade

If > 0 and < 1, the proportion to reduce the brightness of the sector color to get a better 3D effect.

...

graphical parameters passed to plot

Value

The bisecting angle of the sectors in radians.

Details

pie3D scales the values in x so that they total 2*pi, dropping zeros and NAs. It then displays an empty plot, calculates the sequence for drawing the sectors and calls draw.tilted.sector to draw each sector. If labels are supplied, it will call pie3D.label to place a label for each sector. If supplied, the number of labels, label positions and sector colors must be at least equal to the number of values in x. If the labels are long, it may help to reduce the radius of the pie as in the example below.

Examples

Run this code

pieval<-c(2,4,6,8)
 pielabels<-
  c("We hate
 pies","We oppose
  pies","We don't
  care","We just love pies")
 pie3D(pieval,radius=0.9,labels=pielabels,explode=0.1,main="3D PIE OPINIONS")