plotellipse: adds part of a colored and rotated ellipse to a plot

In shape: Functions for Plotting Graphical Shapes, Colors

adds part of a colored and rotated ellipse to a plot

Description

adds (part of) a colored, and rotated ellipse to a plot; an arrow can be drawn at a specified position.

Usage

plotellipse(rx = 1, ry = 0.2, mid = c(0,0), dr = 0.01, 
            angle = 0, from = -pi, to = pi, type = "l", lwd = 2,
            lcol = "black", col = NULL, arrow = FALSE, 
            arr.length = 0.4, arr.width = arr.length*0.5, 
            arr.type = "curved", arr.pos = 1, arr.code = 2, 
            arr.adj = 0.5, arr.col = "black", ...)

Arguments

rx	long radius of ellipse.
ry	short radius of ellipse.
mid	midpoint of ellipse.
dr	size of segments, in radians, to draw ellipse (decrease for smoother).
angle	rotation angle, degrees.
from	starting angle for ellipse segment, radians.
to	final angle for ellipse segment, radians.
type	external line or points; "n" if no line.
lwd	width of external line.
lcol	line color.
col	fill color.
arrow	drawing arrowhead yes/no.
arr.length	length of arrowhead.
arr.width	width of arrowhead.
arr.type	type of arrow.
arr.pos	position of arrow, 0=start,1=end.
arr.code	integer code determining kind of arrows to draw.
arr.adj	adjustment of arrow.
arr.col	color of arrow head.
...	arguments passed to R-function lines.

Details

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

The ellipse is drawn from the point defined by from to the point defined as to which are joined anti-clockwise.

if arrow is TRUE, an arrow is drawn along the path of the ellipse.

arr.length and arr.width set the size of the arrow.

The type of the arrowhead is set with arr.type which can take the values:

• "simple" : uses comparable R function arrows.

• "triangle": uses filled triangle.

• "curved" : draws arrowhead with curved edges.

• "circle" : draws circular head.

arr.pos, a real value between 0 and 1 gives the position (0=start,1=end).

arr.col specifies the color, arr.code specifies where the angle points to.

arr.adj specifies the position adjustment - see Arrows for details.

Author(s)

Karline Soetaert <[e-mail]>

See Also

getellipse, filledellipse, plotcircle.

Examples

emptyplot(c(-1, 1), main = "plotellipse")
plotellipse(rx = 0.8, ry = 0.3, angle = 60, col = "blue")
plotellipse(rx = 1.0, ry = 0.6, angle = 0, from = pi, to = 2*pi,
            arrow = TRUE, arr.pos = seq(0.1, 0.5, by = 0.1),
            arr.col = rainbow(5))
plotellipse(rx = 1.0, ry = 0.6, angle = 30, from = pi, to = 1.2*pi,
            col = "red")
plotellipse(rx = 0.1, ry = 0.6, from = 1.5*pi, to = pi,
            lcol = "orange", mid = c(0.2,0.2))
plotellipse(rx = 0.1, ry = 0.6, angle = 30, from = 1.5*pi, to = pi,
            lcol = "orange", mid = c(0.2,0.2))

shape documentation built on May 29, 2024, 5:07 a.m.