ggplot and axis numbers and labels

Question

i tried to build the following sample plot (see here for an example of a CIELAB Color Wheel). It is nearly finished, but there are still some small issues (see demo): - the

Answer 1

I don't know of any way to do this besides creating the text manually by using theme(axis.text=element_blank(),axis.ticks=element_blank()) to remove the old axes and geom_text() to add the new axis labels. I've modified your code below:

library(ggplot2)
circleFun <- function(center = c(0,0),diameter = 1, npoints = 100){
  r = diameter / 2
  tt <- seq(0,2*pi,length.out = npoints)
  xx <- center[1] + r * cos(tt)
  yy <- center[2] + r * sin(tt)
  return(data.frame(x = xx, y = yy))
}

# sample data for yellow
colorvals <- data.frame(file = 'Yellow.csv', L = 88.94026, a = -9.8599137, b=88.77139)

# build the circles for the plot
r20 <- circleFun(center = c(0, 0), diameter = 40, npoints = 100)
r40 <- circleFun(center = c(0, 0), diameter = 80, npoints = 100)
r60 <- circleFun(center = c(0, 0), diameter = 120, npoints = 100)
r80 <- circleFun(center = c(0, 0), diameter = 160, npoints = 100)
r100 <- circleFun(center = c(0, 0), diameter = 200, npoints = 100)
r120 <- circleFun(center = c(0, 0), diameter = 240, npoints = 100)
dat <- rbind(r20, r40, r60, r80, r100, r120)

# define labels and coordinates for axes
y.labs <- data.frame(x=rep(0,11),y=seq(-100,100,by=20))
y.text <- as.character(y.labs[,2])
y.text[6] <- ""
x.labs <- data.frame(x=seq(-100,100,by=20),y=rep(0,11))
x.text <- as.character(x.labs[,1])
x.text[6] <- ""

# plot the data
ggplot(data = dat, aes(x, y)) +
  geom_path() +
  geom_hline() +
  geom_vline() +
  theme(axis.text=element_blank(),axis.ticks=element_blank(),legend.position = c(1,0), legend.justification=c(1,0)) +
  xlab("a* (Grün/Rot)") +
  ylab("b* (Gelb/Blau)") +
  labs(colour="L*") +
  geom_point(data = colorvals, aes(x = a, y = b), size=3) +
  geom_text(data = colorvals, aes(x = a, y = b, label = gsub(".csv", "", file)), size = 3, vjust=0,hjust=1.2) +
  geom_text(data=x.labs, aes(x = x, y = y,label = x.text),vjust=0,hjust=.5) +
  geom_text(data=y.labs, aes(x = x, y = y,label = y.text),vjust=.5,hjust=1)