controlling color of factor group in ggvis - r

Question

I have a question about controlling the color of datapoints in ggvis.

I have a dataframe that I am filtering in multiple ways (within a shiny app in case it matters).

Answer 1

Solution 1

It seems as if I overlooked a very easy solution:

Just re-define the levels of the factor, and drop the factor from the fill=

I'll leave this up as it might help someone else.

dfvis$mygroup<-factor(dfvis$mygroup, levels=c("A", "B", "C", "D", "E"))

dfvis %>% 
  ggvis(x= ~x, y= ~y)  %>% 
  layer_points(fill = ~mygroup)

Solution 2

This may actually have more generalizability for ggvis users. We can take advantage of : versus :=. Make a new variable of colors for each group

dfvis$color <- c("blue","orange","green","red","purple")

Then we can use the unscaled raw value of colors with fill:= inside the ggvis function...

#:= denotes unscaled raw value
dfvis %>% 
  ggvis(x= ~x, y= ~y, fill:= ~color)  %>% 
  layer_points()

This will ensure color consistency even after filtering out other groups.