plotrix (version 3.8-4)

draw.circle: Draw a circle

Description

Draws a circle on an existing plot.

Usage

draw.circle(x,y,radius,nv=100,border=NULL,col=NA,lty=1,density=NULL,
  angle=45,lwd=1)

Value

A list with the x and y coordinates of the points on the circumference of the last circle displayed.

Arguments

x,y

Coordinates of the center of the circle.

radius

Radius (or radii) of the circle(s) in user units.

nv

Number of vertices to draw the circle.

border

Color to use for drawing the circumference.

col

Color to use for filling the circle.

lty

Line type for the circumference.

density

Density for patterned fill. See polygon.

angle

Angle of patterned fill. See polygon.

lwd

Line width for the circumference.

Author

Jim Lemon, thanks to David Winsemius for the density and angle args

Details

draw.circle uses the dimensions of the plot and the x and y coordinates to draw a circle rather than an ellipse.

See Also

polygon

Examples

 plot(1:5,seq(1,10,length=5),type="n",xlab="",ylab="",main="Test draw.circle")
 draw.circle(2,4,c(1,0.66,0.33),border="purple",
  col=c("#ff00ff","#ff77ff","#ffccff"),lty=1,lwd=1)
 draw.circle(2.5,8,0.6,border="red",lty=3,lwd=3)
 draw.circle(4,3,0.7,border="green",col="yellow",lty=1,
  density=5,angle=30,lwd=10)
 draw.circle(3.5,8,0.8,border="blue",lty=2,lwd=2)