Add an Ellipse to existing plot

Usage

ellipse(
  x = 0,
  y = x,
  radius.x = 1,
  radius.y = radius.x,
  rot = 0,
  nv = 512,
  border = par("fg"),
  col = par("bg"),
  lty = par("lty"),
  lwd = par("lwd"),
  plot = TRUE
)

Arguments

x, y: the x and y co-ordinates for the center(s) of the ellipse(s).
radius.x: scalar or a vector giving the semi-major axis of the ellipse.
radius.y: a scalar or a vector giving the semi-minor axis of the ellipse.
rot: angle of rotation in radians.
nv: number of vertices to draw the ellipses.
border: color for borders. The default is par("fg"). Use border = NA to omit borders.
col: color(s) to fill or shade the annulus sector with. The default NA (or also NULL) means do not fill (say draw transparent).
lty: line type for borders and shading; defaults to "solid".
lwd: line width for borders and shading.
plot: logical. If TRUE the structure will be plotted. If FALSE only the points are calculated and returned. Use this if you want to combine several geometric structures to a single polygon.

Value

The function invisibly returns a list of the calculated coordinates for all shapes.

Examples

plot(c(0, 1), c(0, 1), type = "n")
ellipse(.5, .5, radius.x = 0.5, radius.y = .25, col = "darkgreen", border = "red")