小编Roe*_*rst的帖子

我有一个堆积条形图,其中颜色代表类别,我调整了alpha以将它们细分为2.图例显示了alpha(灰色阴影)和颜色.但是,我想制作一个包含组合的图例.

为了结合它们,我已经看过这个问题,但是我无法将alpha和fill结合起来.这是一个可重复的图形,不起作用:

mtcars %>% 
ggplot(aes(gear, mpg, fill = as.factor(vs), alpha = as.factor(am)))+
geom_bar(stat = "identity")+
scale_fill_manual(name = "legend",
                  values = c(
                      "0" = "red",
                      "1" = "blue",
                      "0"="red",
                      "1"="blue"
                      ),
                  labels = c("V-engine, automatic", 
                             "V-engine, manual",
                             "Straight-engine, automatic",
                             "Straight-engine, manual")
                  )+
scale_alpha_manual(name = "legend",
                   values = c(
                       "0" = 1,
                       "1"=2/5,
                       "0"=1,
                       "1"=2/5
                       ),
                   labels = c(
                       "V-engine, automatic", 
                       "V-engine, manual",
                       "Straight-engine, automatic",
                       "Straight-engine, manual"
                       )  )