r - 如何使用ggplot2在甘特图中有条件地加粗y轴文本

Question

我正在尝试使用主题根据属性 ActivitySort 有条件地设置元素文本。如果值为 0，我想将文本加粗，否则我希望它保持简单。

require("tidyverse")

task0 <- c('Strategy 1', 'Strategy 1', '2017-04-01', '2020-04-01',0, "Strategy")
task1 <- c('Strategy 1', 'Collect data', '2017-04-01', '2018-04-01',1, "In Progress")
task2 <- c('Strategy 1', 'Clean data', '2018-04-01', '2018-06-01', 1, "Completed")
task3 <- c('Strategy 1', 'Analyse data', '2018-06-01', '2019-04-01',1, "Discontinued")
task10 <- c('Strategy 2', 'Strategy 2', '2017-04-01', '2020-04-01',0, "Strategy")
task11 <- c('Strategy 2', 'Collect data again', '2017-04-01', '2018-04-01',1, "In Progress")
task12 <- c('Strategy 2', 'Clean data again', '2018-04-01', '2018-06-01', 1, "Completed")
task13 <- c('Strategy 2', 'Analyse data again', '2018-06-01', '2019-04-01',1, "Discontinued")
task14 <- c('Strategy 2', 'Write report again', '2019-04-01', '2020-04-01', 1, "Planned")

dataset <- as.data.frame(rbind(task0, task1, task2, task3,task10, task11, task12, task13, task14))
names(dataset) <- c('StrategyName', 'Activity', 'Start', 'End', 'ActivitySort', "Status")


dataset <-  as_tibble(dataset)
dataset <-  dataset  %>% mutate(StartSort = as.Date(Start, "%Y-%m-%d" ))
dataset <-  dataset %>% arrange(desc(StrategyName), desc(ActivitySort), desc(StartSort),Activity,  End)

acts <- c("Strategy", "Completed","In Progress", "Discontinued","Planned")
actcols <- c("#000000","#548235", "#2E75B6", "#BF9000", "#7030A0")
els <-unique(dataset$Activity)

g.gantt <- gather(dataset, "state", "date", 3:4) %>% mutate(date = as.Date(date, "%Y-%m-%d" ), Status=factor(Status, acts[length(acts):1]), Activity=factor(Activity, els))

plot <- ggplot(g.gantt, aes(x = date, y = Activity, color = Status, group=Activity)) +
  geom_line(size = 5) +
  scale_color_manual(values=actcols, name="Status",  breaks = acts, limits = acts) +
  labs(x="Project year", y=NULL, title="Activity timeline")

plot <- plot + facet_grid(rows = vars(StrategyName),  scales="free")


plot <- plot + theme(axis.text.y=  element_text(face=ifelse((dataset$ActivitySort == 0),"bold","plain")))

plot

代码当前使用 ifelse 将文本加粗，但结果不符合预期。我只想要策略、带有黑线的项目和策略状态为粗体。请注意，目前只有第二个策略是粗体的，而期望两个策略都是粗体的。

Answer 1

您的问题在于您将数据拆分为两个方面，并且将 y 轴设置为自由。这意味着它们并不相同。通过 ifelse声明，你只是传递 9 TRUE或 FALSE与外部数据集有关的值，即您的上图获得 9 个值(其中前 4 个是 FALSE，因此没有任何内容以粗体显示)，而您的下图也获得相同的 9 个值，并且从第 5 个一个是TRUE , Strategy 2以粗体显示。
您可以通过删除 scales="free" 轻松检查这一点。部分来自 facet_grid .你应该得到这样的东西:



因此，您必须使用一个自定义函数，该函数将根据每个标签的内容加粗。
我已经修改了来自 here 的代码.

bold_labels <- function(breaks) {
  strategy <- filter(dataset, Activity %in% breaks) %>% 
    mutate(check = str_detect(Activity, "Strategy")) %>% 
    pull(check)
  labels <- purrr::map2(
    breaks, strategy,
    ~ if (.y) bquote(bold(.(.x))) else bquote(plain(.(.x)))
  )
  parse(text = labels)
}
plot <- ggplot(g.gantt, aes(x = date, y = Activity, color = Status, group=Activity)) +
  geom_line(size = 5) +
  scale_color_manual(values=actcols, name="Status",  breaks = acts, limits = acts) +
  labs(x="Project year", y=NULL, title="Activity timeline") +
  scale_y_discrete(labels = bold_labels) +
  facet_grid(rows = vars(StrategyName), scales="free_y")
plot

结果: