Draw ellipse

Description

Draws ellipses on an existing plot.

Usage

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draw.ellipse(x, y, a = 1, b = 1, angle = 0, segment = c(0, 360), 
arc.only = TRUE, deg = TRUE, nv = 100, border = NULL, 
col = NA, lty = 1, lwd = 1, ...)

Arguments

x

A vector or a matrix (if y is missing).

y

A vector, can be missing.

a,b

Vectors, radii of the ellypses along the two axes in user units.

angle

Angle of rotation in degrees (if deg=TRUE) or in radians (if deg=FALSE).

segment

Start and endpoints of arc in degrees (if deg=TRUE) or in radians (if deg=FALSE).

arc.only

Logical, if segmen the full ellipse is not drawn, radii from the ends of the arc are drawn to form a sector (see Examples).

deg

Logical, if angles are given in degrees (TRUE) or radians.

nv

Number of vertices to draw the ellipses.

border

Color to use for drawing the circumference.

col

Color to use for filling the circle.

lty

Line type for the circumference.

lwd

Line width for the circumference.

...

Additional arguments passed to polygon.

Value

Draw ellipses as a side effect. Returns NULL invisibly.

Author(s)

Peter Solymos <solymos@ualberta.ca>

See Also

polygon

Examples

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plot(c(0,10), c(0,10), type="n", main="test draw.ellipse")
draw.ellipse(c(3,7), c(8,8), c(0.5,1), c(1,0.5), col=c(2,4), angle=c(45,0), segment=rbind(c(0,45),c(45,360)))
draw.ellipse(c(3,7), c(6,6), c(0.5,1), c(1,0.5), col=c(2,4), angle=c(45,0), segment=rbind(c(0,45),c(45,360)), arc.only=FALSE)
draw.ellipse(c(3,7), c(4,4), c(0.5,1), c(1,0.5), border=c(2,4), angle=c(45,0), segment=rbind(c(0,45),c(45,360)), arc.only=FALSE)
draw.ellipse(c(3,7), c(2,2), c(0.5,1), c(1,0.5), border=1, angle=c(45,0), lty=3)
draw.ellipse(c(3,7), c(2,2), c(0.5,1), c(1,0.5), border=c(5,3), angle=c(45,0), nv=c(3,4), lty=2, lwd=2)

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