[英]ggplot how to get legend line colours match those on the main plot
我正在 ggplot 中创建一个简单的点和线图,类似于下面的示例:
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")
我发现与每一行关联的“名称”的字母顺序控制了图例中的顺序,我可以使用 scale_linetype_manual 将所需的线条样式与这些线条匹配。 但是,我无法弄清楚如何让绘图上的线条颜色与线型图例中的颜色相匹配,它只使用最后指定的线条颜色?
这就是我要做的。
geom_hline
调用,让ggplot2
根据来自vert_data
data.frame
的数据自动绘制水平线。linetype
和colour
的图例。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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