[英]ggplot how to get legend line colours match those on the main plot
我正在 ggplot 中創建一個簡單的點和線圖,類似於下面的示例:
dat <- iris %>% # dummy data
select(Sepal.Length) %>%
mutate(Type = "Sepal.Length")
ggplot() +
geom_point(data = dat, aes(x = as.numeric(row.names(dat)), y = Sepal.Length, shape = Type), colour = "orange") +
scale_shape_manual(values = 10) +
geom_hline(aes(yintercept = 6, linetype = 'C Red line'), colour = "red", size = 0.5) +
geom_hline(aes(yintercept = 5, linetype = 'A Blue line'), colour = "darkblue", size = 0.5) +
geom_hline(aes(yintercept = 7, linetype = 'B Green line'), colour = "forestgreen", size = 0.5) +
scale_linetype_manual(values = c('solid', 'dashed', 'dotted')) +
labs(linetype = "Line legend") +
labs(shape = "Point legend")
我發現與每一行關聯的“名稱”的字母順序控制了圖例中的順序,我可以使用 scale_linetype_manual 將所需的線條樣式與這些線條匹配。 但是,我無法弄清楚如何讓繪圖上的線條顏色與線型圖例中的顏色相匹配,它只使用最后指定的線條顏色?
這就是我要做的。
geom_hline
調用,讓ggplot2
根據來自vert_data
data.frame
的數據自動繪制水平線。linetype
和colour
的圖例。vert_data <- data.frame(
yintercept = c(6, 5, 7),
name = c("C Red line", "A Blue line", "B Green line"),
linetype = c("dotted", "solid", "dashed"),
colour = c("red", "darkblue", "forestgreen"))
ggplot() +
geom_point(
data = dat,
aes(x = as.numeric(row.names(dat)), y = Sepal.Length, shape = Type),
colour = "orange") +
scale_shape_manual(values = 10) +
geom_hline(
data = vert_data,
aes(yintercept = yintercept, linetype = name, colour = name),
size = 0.5) +
scale_linetype_manual(
"Line legend", values = setNames(vert_data$linetype, vert_data$name)) +
scale_colour_manual(
"Line legend", values = setNames(vert_data$colour, vert_data$name)) +
labs(shape = "Point legend")
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