ggplot2:使线上的点颜色比线条颜色更深

Question

我想让图表上的每个点与线条颜色不同.这是样本数据.

df <- structure(list(yrmonth = structure(c(17167, 17167, 17167, 17198, 
17198, 17198, 17226, 17226, 17226, 17257, 17257, 17257), class = "Date"), 
    index = structure(c(2L, 1L, 3L, 2L, 1L, 3L, 2L, 1L, 3L, 2L, 
    1L, 3L), .Label = c("E-W", "N-S", "OS"), class = "factor"), 
    N = c(2, 2, 1, 2, 2, 1, 2, 2, 1, 2, 2, 1), data = c(129, 
    141, 27, 150.5, 209, 87, 247.5, 243, 188, 223, 226.5, 170
    )), .Names = c("yrmonth", "index", "N", "data"), row.names = 31:42, class = "data.frame")

这是我的情节代码.

df$yrmonth <- lubridate::ymd(df$yrmonth)

ggplot(df, aes(x=yrmonth,y=data,colour=factor(index), group=index)) + 
  geom_line(size=.4) + 
  geom_point(size=1)

我希望绿点是深绿色,橙色点是深橙色等等.

Answer 1

您可以使用填充点标记(形状21到25),这样您可以将点的填充颜色与线的颜色分开设置.在下面的代码中,我对点和线使用相同的色调(函数的h参数hcl),但点的亮度(l参数hcl)较低,因此它们将比线条更暗.我还增加了线条和磅值,以便更容易看出差异.

ggplot(df, aes(x=yrmonth,y=data)) + 
  geom_line(size=1, aes(colour=factor(index))) + 
  geom_point(size=3, aes(fill=factor(index)), shape=21, colour="#FFFFFF00") +
  scale_colour_manual(values=hcl(seq(15,375,length=4)[1:3], 100, 70)) +
  scale_fill_manual(values=hcl(seq(15,375,length=4)[1:3], 100, 40)) +
  theme_classic() +
  labs(colour="Index", fill="Index")