plotrix (version 3.8-2)

floating.pie: Display a floating pie chart

Description

Displays a pie chart at an arbitrary position on an existing plot

Usage

floating.pie(xpos=0,ypos=0,x,edges=200,radius=1,col=NULL,startpos=0,
  shadow=FALSE,shadow.col=c("#ffffff","#cccccc"),explode=0,...)

Value

The bisecting angle of the sectors in radians. Useful for placing text labels for each sector. If any values in x were zero or NA, no angle is returned for that value. This means that the user must adjust the labels accordingly if pie.labels is called.

If floating.pie is called with no graphics device, it will try to open one with the appropriate dimensions.

If pie.labels is called, ensure that the center of the pie chart and any explode values are the same.

Arguments

xpos,ypos

x and y position of the center of the pie chart

x

a numeric vector for which each value will be a sector

edges

the number of lines forming a circle

radius

the radius of the pie in user units

col

the colors of the sectors - defaults to rainbow

startpos

The starting position for drawing sectors in radians.

shadow

Logical - whether to draw a shadow

shadow.col

Colors to use for a shadow.

explode

How much to "explode" one or more of the sectors.

...

graphical parameters passed to polygon

Author

Jim Lemon

Details

floating.pie displays a pie chart with an optional shadow on an existing plot (see polygon.shadow). floating.pie now accepts NAs or zeros in x, but simply ignores them.

floating.pie can be useful when multiple pie charts are placed on a plot overlaying something else, like a map.

See Also

pie.labels, boxed.labels, polygon.shadow

Examples

 plot(1:5,type="n",main="Floating Pie test",xlab="",ylab="",axes=FALSE)
 box()
 polygon(c(0,0,5.5,5.5),c(0,3,3,0),border="#44aaff",col="#44aaff")
 floating.pie(1.7,3,c(2,4,4,2,8),radius=0.5,
  col=c("#ff0000","#80ff00","#00ffff","#44bbff","#8000ff"))
 floating.pie(3.1,3,c(1,4,5,2,8),radius=0.5,
  col=c("#ff0000","#80ff00","#00ffff","#44bbff","#8000ff"))
 floating.pie(4,1.5,c(3,4,6,7),radius=0.5,
  col=c("#ff0066","#00cc88","#44bbff","#8000ff"))
 draw.circle(3.9,2.1,radius=0.04,col="white")
 draw.circle(3.9,2.1,radius=0.04,col="white")
 draw.circle(3.9,2.1,radius=0.04,col="white")
 draw.circle(4,2.3,radius=0.04,col="white")
 draw.circle(4.07,2.55,radius=0.04,col="white")
 draw.circle(4.03,2.85,radius=0.04,col="white")
 text(c(1.7,3.1,4),c(3.7,3.7,3.7),c("Pass","Pass","Fail"))
 plot(0,xlim=c(-1.5,1.5),ylim=c(-1.5,1.5),type="n",axes=FALSE,
  main="Floating pie with minor explosions",xlab="",ylab="")
 floating.pie(x=1:5,explode=c(0,0.1,0,0.2,0))