plotrix (version 3.8-2)

draw.radial.line: Draw a radial line

Description

Draws a line radiating from a specified center, optionally expanding the line width as a function of distance from center.

Usage

draw.radial.line(start, end, center=c(0, 0), angle=0, deg=NA,
  expand=FALSE, col=NA, lwd=NA, ...)

Value

nil

Arguments

start

Distance from center of circular area to start of line in x/y user units.

end

Distance from center of circular area to end of line in x/y user units.

center

The center of the circular area in x/y user units.

angle

The angular position of the line in radians.

deg

The angular position of the line in degrees (takes precedence if not NA).

expand

TRUE to expand line width in proportion to distance from center.

col

The color of the line, NA for par("col").

lwd

The width of the line in device-specific units, NA for par("lwd").

...

Arguments passed to 'lines' (expand=FALSE) or 'polygon' (expand=TRUE).

Author

Ted Toal

Details

If the user passes a value for 'deg', this overrides any value passed to 'angle'.

If 'expand' is FALSE, the line width is constant (as specified by par("lwd").

If 'expand' is TRUE, the line width is equal to the lwd value at distance 'end' and contracts as it moves towards 'start'. When expand is 'TRUE', lty is ignored.

See Also

lines, linkdraw.arc

Examples

 plot(0, xlim=c(1,5), ylim=c(1,5), main="Test of radial lines", xlab="", ylab="", type="n")
 points(3, 3, pch=20)
 draw.radial.line(1, 2, center=c(3,3))
 draw.radial.line(1, 2, center=c(3,3), angle=pi/4)
 draw.radial.line(1, 2, center=c(3,3), angle=pi/4+0.1, col="blue", lwd=4, lty=3)
 draw.radial.line(0.2, 1.2, center=c(3,3), deg=120, col="red", lwd=10)
 draw.radial.line(0.2, 1.2, center=c(3,3), deg=145, col="purple", lwd=10, lend=1)
 draw.radial.line(0.5, 2, center=c(3,3), deg=225, expand=TRUE, col="gold")
 draw.radial.line(0.7, 1.4, center=c(3,3), deg=180, expand=TRUE, col="orange", lwd=30)
 draw.radial.line(0.5, 1.5, center=c(3,3), deg=235, expand=TRUE, lwd=5, col="brown")
 draw.radial.line(0.1, 1.5, center=c(3,3), deg=325, expand=TRUE, lwd=5, col="green")