Error with ggplot2 and gganimate

[avrenli2]

The animated chart does not render properly and it creates the following error messages:

Error occurred in the 1st layer.
Caused by error in unit():
'x' and 'units' must have length > 0
Problem while converting geom to grob.

library(ggplot2)
library(Rcpp)
library(gifski)
library(gganimate)
library(transformr)

library(quantmod)
CHAI <- getSymbols("SBUX" , from="2020-1-1" , to="2021-1-1" , auto.assign=F) 

CATROON <- ggplot(CHAI, aes(y=SBUX.Close,x=index(CHAI)))+
  geom_area(color="pink", size=1.2 , fill="pink" , alpha=0.3)+
  geom_point(color="#8F157E", size=4)+
  labs(x="Time", y="Close Price")+
  theme_bw() + transition_reveal(index(CHAI))  

animate(CARTOON, duration=7 , fps = 30)

[teunbrand]

A more minimal reprex:

library(ggplot2)
library(gganimate)

p <- ggplot(economics, aes(date, unemploy)) +
  geom_area() +
  transition_reveal(date)

animate(p, duration = 1, fps = 30)
#> Warning: Cannot get dimensions of plot table. Plot region might not be fixed
#> Warning: Problem while converting geom to grob.
#> ℹ Error occurred in the 1st layer.
#> Caused by error in `unit()`:
#> ! 'x' and 'units' must have length > 0

^{Created on 2023-01-26 with reprex v2.0.2}

I think the problem can be fixed by setting stat = "identity".

library(ggplot2)
library(gganimate)

p <- ggplot(economics, aes(date, unemploy)) +
  geom_area(stat = "identity") +
  transition_reveal(date)

animate(p, duration = 1, fps = 30)

^{Created on 2023-01-26 with reprex v2.0.2}

But I'm not sure why gganimate errors with the default stat = "align".

[teunbrand]

I think this is probably something that ought to be fixed on gganimate's side, so I'm closing this in favour of thomasp85/gganimate#476.