mapplots (version 1.5.2)

draw.pie: Draw pie plots in an existing plot

Description

Draw pie plots in an existing plot

Usage

draw.pie(x, y, z, radius, scale = T, labels = NA, silent = TRUE, ...)

Arguments

x, y

vector with x and y-locations of the centre of the pies

z

array where the rows correspond to x and y and the columns correspond to categories to be plotted. The function make.xyz can be useful to create z.

radius

the radius of the (largest) pie (y-scale units). This can be a single value or a vector with the same length as x.

scale

logical, should the surface area of each pie plot automatically be scaled to the sum of its z-values? Only works if radius is a vector with a length of 1.

labels

labels for each slice. Defaults to NA, labels are probably best placed in a legend by legend.pie.

silent

logical, should a progress message be displayed in the console? Defaults to FALSE.

...

other arguments to be passed to add.pie

Author

Hans Gerritsen

See Also

add.pie

Examples

data(landings)
data(coast)
xlim <- c(-12,-5)
ylim <- c(50,56)
xyz <- make.xyz(landings$Lon,landings$Lat,landings$LiveWeight,landings$Species)
col <- rainbow(5)
basemap(xlim, ylim, main = "Species composition of gadoid landings")
draw.shape(coast, col="cornsilk")
draw.pie(xyz$x, xyz$y, xyz$z, radius = 0.3, col=col)
legend.pie(-13.25,54.8,labels=c("cod","had","hke","pok","whg"), radius=0.3, bty="n", col=col,
 cex=0.8, label.dist=1.3)
legend.z <- round(max(rowSums(xyz$z,na.rm=TRUE))/10^6,0)
legend.bubble(-13.25,55.5,z=legend.z,round=1,maxradius=0.3,bty="n",txt.cex=0.6)
text(-13.25,56,"landings (kt)",cex=0.8)