DrawAnnulus: Draw One or Several Annuli

Description

Draw an annulus (or a sequence of annuli) with given center coordinates, fill and border colors on an existing plot using classical graphics.

Usage

DrawAnnulus(x = 0, y = x, radius.in = 1, radius.out = 2, nv = 100, 
            border = par("fg"), col = par("bg"), lty = par("lty"), 
            lwd = par("lwd"), plot = TRUE)

Arguments

x, y

a vector (or scalar) of xy-coordinates of the center(s).

radius.in

a vector (or scalar) of the inner radius of the annulus(i).

radius.out

a vector (or scalar) of the outer radius of the annulus(i).

number of vertices to draw the circles. Default is 100.

border

color for the border(s). The default is par("fg"). Use border = NA to omit borders. If there are shading lines, border = TRUE means use the same colour for the border as for the shading lines.

col

color(s) to fill or shade the annulus with. The default NA (or also NULL) means do not fill, i.e., draw transparent rectangles, 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 xy-points are calculated and returned. Use this option if you want to combine several geometric structures to a single polygon.

Value

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

Details

All geometric arguments are recycled if necessary.

Examples

Run this code

Canvas(0.5)
DrawRegPolygon(nv=4, rot=pi/4, col="lightblue")
DrawAnnulus(radius.in=0.3, radius.out=0.45, col="lightgrey", border="darkgrey", lwd=5)

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