How can I have two different scale_fill_manual active in a ggplot command
ggplot2, graph, r
Solution
The problem is that you are using `"a"` and `"b"` in both `rects` and `scores`, so they get mapped to the same color. Since the rectangles seem to be placeholder values, change them to something distinct that sorts later than anything in `scores`.
rects$col <- c("Z1","Z2","Z3","Z4","Z5")
Now you can make one `scale_fill_manual` with all (7) colors.
ggplot() +
geom_rect(data = rects, aes(xmin = -Inf, xmax = Inf, ymin = ystart,
ymax = yend, fill=col), alpha = 0.3) +
opts(legend.position="none") +
geom_bar(data=scores, aes(x=category, y=percentage, fill=type), stat="identity") +
scale_fill_manual(values=c("indianred1", "indianred4", medals)) +
scale_x_continuous(breaks = 1:4, labels = labels)
Problem
This question follows on from my earlier one about background colours in ggplot2. From the answers there, I am now able to use `geom_rect` to give a background to my plot that has five different colours. On top of that I'd like to plot a barchart that uses two different colours. I can do each of these tasks separately, but when I try to combine them the `scale_fill_manual` commands clash. Here's what I'm trying: ``` scores = data.frame(category = 1:4, percentage = c(34,62,41,44), type = c("a","a","a","b")) rects <- data.frame(ystart = c(0,25,45,65,85), yend = c(25,45,65,85,100), col = letters[1:5]) labels = c("ER", "OP", "PAE", "Overall") medals = c("navy","goldenrod4","darkgrey","gold","cadetblue1") ggplot() + geom_rect(data = rects, aes(xmin = -Inf, xmax = Inf, ymin = ystart, ymax = yend, fill=col), alpha = 0.3) + scale_fill_manual(values=medals) + opts(legend.position="none") + geom_bar(data=scores, aes(x=category, y=percentage, fill=type), stat="identity") + #scale_fill_manual(values = c("indianred1", "indianred4")) + scale_x_continuous(breaks = 1:4, labels = labels) ``` As written, this makes the two barchart colours the same as the first two background colours. Removing the "`#`" on the second `scale_fill_manual` command (penultimate line) overrides the background colour commands to make the bars the colours I want but makes the background have just the two colours I want in the `barchart`. How can I have one `scale_fill_manual` command applying to the `geom_rect` background and the other to the `geom_bar` barchart (or how can I achieve the same effect by other means)?