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)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. |
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).
a 2-column matrix with x-y values of the ellipse
Karline Soetaert <karline.soetaert@nioz.nl>
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)Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.