Error with Ribbon Aesthetic in ggplot2 when Using xmin/xmax with Gradient Fill

[MathieuYeche]

Description:
I have encountered an error when using the ribbon aesthetic with gradient fill in ggplot2. The issue appears to have been introduced by the Gradients in ribbons(#5699) pull request. When combining the use of xmin/xmax aesthetics with gradient fill, the error suggests a typo at line 186 of geom-ribbon.R (likely "tranformed" instead of "transformed"). Removing the typo fixes the issue.

Additionally, on Windows, check_device("gradients", action = "abort", maybe = TRUE) does not work correctly within the default RStudio graphics device (RStudioGD), and the underlyed png support.

Steps to Reproduce:
Run the following code in R:

xr <- seq(1, 101, length.out = 100)
datarr <- data.frame(x = xr, ymin = xr-10, ymax = xr+10)

ggplot(datarr, aes(y = xr, xmin = ymin, xmax = ymax)) +
    geom_ribbon(aes(fill = xr)) +
    scale_fill_gradientn(colors = pals::parula(20))

Observed Error:

Error in `geom_ribbon()`:
! Problem while converting geom to grob.
ℹ Error occurred in the 1st layer.
Caused by error in `draw_group()`:
! object 'tranformed' not found

Expected Behavior:
The code should render a ribbon with a gradient fill without any errors.

R : 4.2.2 (not the most recent)
ggplot2 : 3.5.1.9000

This is my first bug report, so I appreciate any feedback or guidance on further redaction or necessary details.

[teunbrand]

Thanks for the report! I can reproduce the issue.

This is my first bug report, so I appreciate any feedback or guidance on further redaction or necessary details.

Would you like to try your hand at a first pull request as well?

Additionally, on Windows, check_device("gradients", action = "abort", maybe = TRUE) does not work correctly within the default RStudio graphics device (RStudioGD), and the underlyed png support.

The default Windows device isn't recommended and, as far as I know, not really maintained to support more modern features. I'd like to suggest to switch to the ragg png device or else the cairo png device.

[MathieuYeche]

Would you like to try your hand at a first pull request as well?

Thanks ! I would love to try. In which branch should I push?

[teunbrand]

After you've made a fork, you can start a new branch from the main branch (you can name it 'fix_6357' for example), make the edits, and lastly open up a PR.
Because it does not involve automatically generated code (like documentation), it should just be a matter of 1 line change, I think.