Annotation_raster does not work with scale_x_reverse

[bleutner]

Annotation_raster is not displayed, when one scale is reversed.

qplot(mpg, wt, data = mtcars) + annotation_raster(rainbow, xmin = 15,xmax = 20, ymin = 3, ymax = 4)

swiching xmin and xmax, doesn't affect plotting
qplot(mpg, wt, data = mtcars) + annotation_raster(rainbow, xmin = 20, xmax = 15, ymin = 3, ymax = 4)

doesn't work
qplot(mpg, wt, data = mtcars) + annotation_raster(rainbow, xmin = 15, xmax = 20, ymin = 3, ymax = 4) + scale_x_reverse()

Workaround: negative Coordinates
qplot(mpg, wt, data = mtcars) + annotation_raster(rainbow, xmin=-15,xmax=-20, ymin=3, ymax=4) + scale_x_reverse()

[hadley]

This sounds like a great feature, but unfortunately we don't currently have the development bandwidth to support it. If you'd like to submit a pull request that implements this feature, please follow the instructions in the development vignette.