Is there any chance to write text which is "wrapped" around the circle? I mean something like this:
plotrix::arctext
library(plotrix)
# set up a plot with a circle
plot(x = 0, y = 0, xlim = c(-2, 2), ylim = c(-2, 2))
draw.circle(x = 0, y = 0, radius = 1)
# add text
arctext(x = "wrap some text", center = c(0, 0), radius = 1.1, middle = pi/2)
arctext(x = "counterclockwise", center = c(0, 0), radius = 1.1, middle = 5*pi/4,
clockwise = FALSE, cex = 1.5)
arctext(x = "smaller & stretched", center = c(0, 0), radius = 1.1, middle = 2*pi ,
cex = 0.8, stretch = 1.2)
circlize
For greater opportunities of customization, check the circlize
package (see the circlize
book). By setting facing = "bending"
in circos.text
, the text wraps around a circle.
library(circlize)
# create some angles, labels and their corresponding factors
# which determine the sectors
deg <- seq(from = 0, to = 300, by = 60)
lab <- paste("some text", deg, "-", deg + 60)
factors <- factor(lab, levels = lab)
# initialize plot
circos.par(gap.degree = 10)
circos.initialize(factors = factors, xlim = c(0, 1))
circos.trackPlotRegion(ylim = c(0, 1))
# add text to each sector
lapply(factors, function(deg){
circos.updatePlotRegion(sector.index = deg, bg.col = "red")
circos.text(x = 0.5, y = 0.5, labels = as.character(deg), facing = "bending")
})
circos.clear()
From circlize
version 0.2.1, circos.text
has two new options: bending.inside
which is identical to original bending
and bending.outside
(see Figure 3.4 in the circlize
book). Thus, it is easy to turn the text in the bottom half of the plot using bending.outside
:
circos.par(gap.degree = 10)
circos.initialize(factors = factors, xlim = c(0, 1))
circos.trackPlotRegion(ylim = c(0, 1))
lapply(factors[1:3], function(deg){
circos.updatePlotRegion(sector.index = deg, bg.col = "red")
circos.text(x = 0.5, y = 0.5, labels = as.character(deg), facing = "bending.outside")
})
lapply(factors[4:6], function(deg){
circos.updatePlotRegion(sector.index = deg, bg.col = "red")
circos.text(x = 0.5, y = 0.5, labels = as.character(deg), facing = "bending.inside")
})
circos.clear()