控制position_dodge的层次结构 [英] control hierarchy of position_dodge

问题描述

如果人使用躲避的条形图，是否有一种方法可以控制将哪个元素绘制在另一个元素的前面.

Is there a way to control which element is plotted in front of the other if one uses dodged bar charts.

 ggplot(mtcars, aes(x=factor(cyl), fill=factor(vs))) +
    geom_bar(position= position_dodge (width = - 0.5))

在此示例中，蓝色条形图绘制在红色条形图之前.是否有可能在不修改Alpha值的情况下撤销订单?

In this example the blue bars are plotted in front of the red ones. Is it possiple to reverse the order without hacking alpha values?

推荐答案

您在这里的控制受到限制.使用因子级别，我们可以控制i)fill的颜色排序和ii)使用group的position_dodge排序.

Your control here is limited. Using factor levels we can control i) the fill color ordering and ii) the ordering of position_dodge using group.

以下是四个选项:

p1 <- ggplot(mtcars, aes(x = factor(cyl), fill = factor(vs, 0:1), group = factor(vs, 0:1))) +
  geom_bar(position = position_dodge(width = - 0.5))

p2 <- ggplot(mtcars, aes(x = factor(cyl), fill = factor(vs, 0:1), group = factor(vs, 1:0))) +
  geom_bar(position = position_dodge(width = - 0.5))

p3 <- ggplot(mtcars, aes(x = factor(cyl), fill = factor(vs, 1:0), group = factor(vs, 0:1))) +
  geom_bar(position = position_dodge(width = - 0.5))

p4 <- ggplot(mtcars, aes(x = factor(cyl), fill = factor(vs, 1:0), group = factor(vs, 1:0))) +
  geom_bar(position = position_dodge(width = - 0.5))

library(cowplot)
plot_grid(p1, p2, p3, p4, align = 'hv')

因此，似乎只有闪避顺序很重要.至少在开发版本中，右栏总是绘制在左栏的前面.

So it seems only the dodging order is important. In the dev version at least, the right bar is always plotted in front of the left bar.

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