Geom_point : when using color and alpha : how to delete the alpha legend in ggplot?-CodePudding

I have this df that is visualized as followed:

df = data.frame(x = -10:11,
                y = seq(-5,5.5,by=0.5),
                z = rep(c(1,2),11) )

df

ggplot(df) aes(x=x,y=y,color=factor(z),alpha=z) 
  geom_point() 
  geom_hline(yintercept=0) 
  geom_vline(xintercept = 0) 
  theme_blank()

The output:

I checked all similar questions but nothing has worked out to remove the alpha legend. Thanks.

CodePudding user response：

You could add in alpha in aesthetics and use guides to remove it like this:

df = data.frame(x = -10:11,
                y = seq(-5,5.5,by=0.5),
                z = rep(c(1,2),11) )
library(ggplot2)

ggplot(df) aes(x=x,y=y,color=factor(z), alpha=z) 
  geom_point() 
  geom_hline(yintercept=0) 
  geom_vline(xintercept = 0)  
  guides(alpha = "none")

^{Created on 2023-01-20 with reprex v2.0.2}