ggplot geom_col图例未显示

时间:2018-01-07 05:02:37

标签: r plot ggplot2 legend

我试图展示一个传奇,伴随着使用ggplot和geom_col创建的情节 - 我的传奇没有出现。我最初使用geom_bar绘制这些数据(有一个可见的图例,但有一些其他问题),但经过更多的研究,使用geom_col似乎更合适。

我知道这个话题有很多google-able的问题和答案,但经过多次搜索和代码变化后,我仍然没有成功。

如何让我的传奇可见?

我的可重复代码如下。

site <- c(0.700, 0.854)
site <- lapply(site, function(x) round((x*100),1)) 
site <- unlist(site, use.names=FALSE) 
state <- c(0.726, 0.808)
state <- lapply(state, function(x) round((x*100),1)) 
state <- unlist(state, use.names=FALSE)
measure <- c("Individual", "Coalition")
measure <- unlist(measure, use.names=FALSE)
df1 <- data.frame(site,state,measure)
df2 <- melt(df1, id.vars='measure')
df2$variable <- factor(df2$variable,
                       levels = c('state','site'),ordered = TRUE)
fillcolors <- c("#7189A6", "#817BB0", "#7189A6", "#817BB0")

myplot <- 
  ggplot(df2, aes(measure, value, group = variable)) +
  geom_col(width=.75, position=position_dodge(width=0.80), fill=fillcolors)     +
  labs(title = paste0("Knowledge & Skills Gained", paste0(rep("", 0), collapse = " ")), 
      x = "", y = "", fill="") +
  scale_y_continuous(limits=c(0,100), labels = function(x){ paste0(x, "%")     }) +
  coord_flip() +
  geom_text(aes(label=(paste0(value,"%"))), size=3,
        colour = "#57585a",
        position=position_dodge(width=0.75), vjust=.3, hjust=-.1) +
  theme(legend.position="right", title = element_text(colour = "#57585a"),
        legend.text = element_text(colour="#57585a", size = 9))

  myplot

这导致以下情节:myplot

提前谢谢!

1 个答案:

答案 0 :(得分:0)

主要问题是您应该使用fill=,而不是group=

  ggplot(df2, aes(measure, value, fill = variable)) +
  geom_col(width=.75, position=position_dodge(width=0.80))     +
  labs(title = paste0("Knowledge & Skills Gained", paste0(rep("", 0), collapse = " ")),
       x = "", y = "", fill="") +
  scale_y_continuous(limits=c(0,100), labels = function(x){ paste0(x, "%")     }) +
  coord_flip() +
  geom_text(aes(label=(paste0(value,"%"))), size=3,
            colour = "#57585a",
            position=position_dodge(width=0.75), vjust=.3, hjust=-.1) + 
  scale_fill_manual(values = c("#817BB0", "#7189A6")) +   
  guides(fill = guide_legend(reverse=T))

(还有很多其他方法可以清理你的代码;我只专注于让传奇出现。)