How to annotate different values ​​for each face (dashed line) on R?

Question

I would like to know how to comment on every facet in my bar. Right now I am using the geom_signif function, which works fine, except that it duplicates the annotation on one face to another face.

My code is this:

geom_signif(annotation = c("p=0.01"),
            y_position = c(9), xmin = c(2), xmax = c(3))

My schedule:

Please inform. I read some similar solutions here, tried other ways, but I still can not understand what it is. This is the closest and simplest solution for what I have received so far, except that I need two different annotations (marking the p-value in this case - I used ANOVA separately) on the verge.

Answer 1

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df <- data.frame(iris,type = c(1,2))

## Construct your plot exactly as you have already done
## Annotations are replicated.
myplot <- ggplot(df, aes(x=Species,y = Sepal.Length)) + 
    geom_boxplot() + 
    facet_grid(.~type) + 
    geom_signif(annotation = c("foo"),xmin = 1, xmax = 2,y_position = 7.5)
myplot

## Disassemble plot
myplot2 <- ggplot_build(myplot)
myplot2$data[[2]]

 x xend     y  yend annotation group PANEL shape colour textsize angle hjust vjust alpha family fontface lineheight
1 1    1 7.392 7.500        foo     1     1    19  black     3.88     0   0.5     0    NA               1        1.2
2 1    2 7.500 7.500        foo     1     1    19  black     3.88     0   0.5     0    NA               1        1.2
3 2    2 7.500 7.392        foo     1     1    19  black     3.88     0   0.5     0    NA               1        1.2
4 1    1 7.392 7.500        bar     1     2    19  black     3.88     0   0.5     0    NA               1        1.2
5 1    2 7.500 7.500        bar     1     2    19  black     3.88     0   0.5     0    NA               1        1.2
6 2    2 7.500 7.392        bar     1     2    19  black     3.88     0   0.5     0    NA               1        1.2
  linetype size
1        1  0.5
2        1  0.5
3        1  0.5
4        1  0.5
5        1  0.5
6        1  0.5

## Note there are 6 observations, 3 for each "PANEL". 
## Now, change the annotation on each "PANEL".
myplot2$data[[2]]$annotation <- c(rep("foo",3),rep("bar",3))

## Reconstruct plot
myplot3 <- ggplot_gtable(myplot2)
plot(myplot3)