r - 多图例理由

Question

我试图证明 ggplot 中的多个传说是合理的，但没有任何真正的成功。在绘图区域(灰色区域)外显示图例时，对齐方式是正确的。但是，在绘图区域内显示图例时，图例居中(我想让它们左对齐)。我曾尝试关注 this thread但它仍然无法正常工作。

我的例子:

library(ggplot2)

ggplot(mtcars, aes(wt, mpg)) +
  geom_point(aes(colour = factor(cyl), size = qsec)) +
  geom_point(aes(colour = factor(cyl), size = qsec)) +
  theme(legend.justification = c(1,0),
        legend.position = c(1,0),
        legend.margin = unit(0,"lines"),
        legend.box = "vertical",
        legend.key.size = unit(1,"lines"),
        legend.text.align = 0,
        legend.title.align = 0)

Answer 1

我们需要添加 legend.box.just = "left"进入您现有的 theme() .

ggplot(mtcars, aes(wt, mpg)) +
  geom_point(aes(colour = factor(cyl), size = qsec)) +
  geom_point(aes(colour = factor(cyl), size = qsec)) +
  theme(legend.box.just = "left",
        legend.justification = c(1,0),
        legend.position = c(1,0),
        legend.margin = unit(0,"lines"),
        legend.box = "vertical",
        legend.key.size = unit(1,"lines"),
        legend.text.align = 0,
        legend.title.align = 0)