合并两个图，使系列的颜色在图例中重合

Question

我想把两个地块放在另一个上面。这两个图都共享相同的X和Y轴。唯一的区别是第一个图是条形图，第二个图是折线图。

library("ggplot2")

p1 <- ggplot(result_a, aes(x=type,y=as.numeric(num_excluded),fill=as.factor(year),width=.5)) +   
  geom_bar(position = "stack", stat="identity")+
  coord_flip()

p1 <- p1 + guides(fill=guide_legend(title="Legend:")) + 
  scale_fill_brewer(palette="Set1") 


p2 <- ggplot(result_a, aes(x=type,y=as.numeric(total),
                           group=as.factor(year),color=as.factor(year),
                           width=.5)) +   
  geom_line()+geom_point()+
  coord_flip()

如何将它们组合在一起以使线条和条形的颜色重合（即图例中给出的颜色的解释是指线条和条形）？

更新

dput(result_a)

structure(list(year = c(2011, 2011, 2011, 2012, 2012), type = c("AAA", "BBB", "AAA","BBB", "AAA"), num_excluded = c(5, 2, 4, 15, 2), total = c(100,20,500,300,100)))

Answer 1

你是说这样的吗？

ggplot(result_a) +   
    geom_bar(aes(x = type, y = as.numeric(num_excluded),
                 fill = as.factor(year), width=.5), position = "stack", stat = "identity") +
    geom_line(aes(x = type, y = as.numeric(total),
                  group = as.factor(year), color = as.factor(year),
                  width = .5), size = 2) +
    coord_flip()+ 
    guides(fill = guide_legend(title = "Legend:")) + 
    scale_fill_brewer(palette = "Set1") +
    scale_color_brewer(palette = "Set1", guide = FALSE)