x-y coordinates of ellipse

calculates x-y values for (part of) an ellipse; the ellipse can be rotated

getellipse(rx = 1, ry = rx, mid = c(0, 0), dr = 0.01, 
           angle = 0, from = -pi, to = pi)

Arguments

rx

long radius of ellipse.

ry

short radius of ellipse.

mid

midpoint of ellipse.

dr

size of segments, in radians, to specify ellipse (decrease for smoother).

angle

rotation angle, degrees.

from

starting angle for ellipse segment, radians.

to

final angle for ellipse segment, radians. The segment is generated counterclockwise. The default is draw a full ellipse.

Value

a 2-column matrix with x-y values of the ellipse

Author

Karline Soetaert <karline.soetaert@nioz.nl>

Details

rx and ry are the horizontal and vertical radiusses of the ellipses.

points from and to are joined counterclockwise. (this has changed since version 1.3.4).

Examples

plot(getellipse(1, from = 0, to = pi/2), type = "l", col = "red",
     lwd = 2, main = "getellipse")
lines(getellipse(0.5, 0.25, mid = c(0.5, 0.5)), type = "l", 
      col = "blue", lwd = 2)
lines(getellipse(0.5, 0.25, mid = c(0.5, 0.5), angle = 45), 
      type = "l", col = "green", lwd = 2)

lines(getellipse(0.2, 0.2, mid = c(0.5, 0.5), from = 0, to = pi/2), 
      type = "l", col = "orange", lwd = 2)
lines(getellipse(0.2, 0.2, mid = c(0.5, 0.5), from = pi/2, to = 0), 
      type = "l", col = "black", lwd = 2)
lines(getellipse(0.1, 0.1, mid = c(0.75, 0.5), from = -pi/2, to = pi/2), 
      type = "l", col = "black", lwd = 2)


emptyplot(main = "getellipse")
col <- femmecol(90)
for (i in seq(0, 180, by = 2)) 
      lines(getellipse(0.5, 0.25, mid = c(0.5, 0.5), angle = i),
            type = "l", col = col[(i/2)+1], lwd = 2)