DrawCircle

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Draw a Circle

Draw one or several circle on an existing plot.

Keywords
aplot
Usage
DrawCircle(x = 0, y = x, r.out = 1, r.in = 0, theta.1 = 0, theta.2 = 2*pi, border = par("fg"), col = NA, lty = par("lty"), lwd = par("lwd"), nv = 100, plot = TRUE)
Arguments
x, y
a vector (or scalar) of xy-coordinates for the center(s) of the circle(s).

r.out
a vector (or scalar) of the outer radius of the circle.

r.in
a vector (or scalar) of a potential inner radius of an annulus.

theta.1
a vector (or scalar) of the starting angle(s). The sectors are built counterclockwise.

theta.2
a vector (or scalar) of the ending angle(s).

nv
number of vertices to draw the circle.

border
color for circle borders. The default is par("fg"). Use border = NA to omit borders.

col
color(s) to fill or shade the circle(s) with. The default NA (or also NULL) means do not fill, i.e., draw transparent circles, unless density is specified.

lty
line type for borders and shading; defaults to "solid".

lwd
line width for borders and shading.

plot
logical. If TRUE the structure will be plotted. If FALSE only the points are calculated and returned. Use this option if you want to combine several geometric structures to a polygon.

Details

All geometric arguments will be recycled.

Value

The function invisibly returns a list of the calculated coordinates for all shapes.

See Also

polygon, DrawRegPolygon, DrawEllipse, DrawArc

Aliases
  • DrawCircle
Examples
Canvas(xlim = c(-5,5), xpd=TRUE)
cols <- Pal("Helsana")[1:4]

# Draw ring
DrawCircle (r.in = 1, r.out = 5, border="darkgrey", col=SetAlpha(hyellow, 0.2), lwd=2)

# Draw circle
DrawCircle (r.in = 6, border=hgreen, lwd=3)

# Draw sectors
geom <- rbind(c(-pi, 0, .25, .5), c(0, pi, 1, 2),
              c(-pi/2, pi/2, 2, 2.5), c(pi/2, 3 * pi/2, 3, 4),
              c(pi - pi/8, pi + pi/8, 1.5, 2.5))

DrawCircle (r.in = geom[,3], r.out = geom[,4],
           theta.1 = geom[,1], theta.2 = geom[,2],
           col = SetAlpha(cols, 0.6),
           border = cols, lwd=1)


# clipping
Canvas(bg="lightgrey", main="Yin ~ Yang")
DrawCircle (r.out = 1, col="white")
clip(0, 2, 2, -2)
DrawCircle(col="black")
clip(-2, 2, 2, -2)
DrawCircle (y = c(-0.5,0.5), r.out = 0.5, col=c("black", "white"), border=NA)
DrawCircle (y = c(-0.5,0.5), r.out = 0.1, col=c("white", "black"), border=NA)
DrawCircle ()


# overplotting circles
Canvas(xlim=c(-5,5))
DrawCircle (r.out=4:1, col=c("white", "steelblue2", "white", "red"), lwd=3, nv=300)


# rotation
x <- seq(-3, 3, length.out=10)
y <- rep(0, length.out=length(x))

Canvas(xlim=c(-5,5), bg="black")

sapply( (0:11) * pi/6, function(theta) {
  xy <- Rotate(x, y=y, theta=theta)
  DrawCircle (x=xy$x, y=xy$y, r.in=2.4, border="white")
} )
Documentation reproduced from package DescTools, version 0.99.19, License: GPL (>= 2)

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