I am trying to create a circular plot and am stuck at a point:

dat1 <- data.frame (xvar = 1:10, y = 6, ymin = 4, ymax = 4.5)

Using this data, I can produce a circular ribbon plot in ggplot2 

require(ggplot2) 
 ggplot(dat1, aes(x=xvar, y=y)) +  geom_ribbon(aes(ymin=ymin, ymax=ymax),
  col = "blue", fill = "blue2") + ylim (c(0,6)) + coord_polar()

However I want more.

I want to fill the segment of the ribbon with different colors and labels using the following data. 

 filld <- data.frame (start = c(1, 4, 6, 7.5, 8, 9), end = c(4, 6, 7.5, 8, 9, 10),
                         label = c("A", "B", "C", "A", "C", "D"))
  filld
##    start  end label
## 1   1.0  4.0     A
## 2   4.0  6.0     B
## 3   6.0  7.5     C
## 4   7.5  8.0     A
## 5   8.0  9.0     C
## 6   9.0 10.0     D

The ribbon will be filled with different color by label variable. For example, the segment A will start from 1 and end at 4. Then segment B will start and end at 6 and filled with different color. Segments with same label (such as A and C) will be connected by line.

The resulting plot will look like this:

r ggplot2
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