ellipse: Add an ellipse in an existing plot

In bedapub/ribiosPlot: Plotting module of ribios for visualization

Add an ellipse in an existing plot

Description

Add an ellipse in an existing plot

Usage

ellipse(
  x0 = 0,
  y0 = 0,
  a = 1,
  b = 2,
  alpha = 0,
  length = 1000,
  col = NULL,
  fill = NA,
  border,
  ...
)

Arguments

x0	x-coordinate of the ellipse center
y0	y-coordinate of the ellipse center
a	Length of semi-major axis
b	Length of semi-minor axis
alpha	Rotation of the ellipse with regard to the X-axis in radian
length	How many points are generated to simulate the ellipse
col	Ellipse border color
fill	Ellipse fill color
border	Equivalent to col
...	further parameters passed to polygon

Value

Invisible coordinates of points on the ellipse

Examples

if(interactive()) {
  plot.new()
  plot.window(xlim=c(-1, 1), ylim=c(-1,1))
  ellipseCols <- heat.colors(11)
  ellipse(0, 0, a=1, b=0.5, alpha=0)
  for(i in 1:11) {
    ellipse(0, 0, a=1, b=0.5, alpha=degree2radian(i*15), col=ellipseCols[i])
  }
  ellipse(0, 0, a=1, b=1, col="black", lwd=2)
  ellipse(0, 0, a=0.5, b=0.5, fill="steelblue")
}

bedapub/ribiosPlot documentation built on Sept. 1, 2023, 6:50 p.m.