控制由ggplot2中的因子变量生成的饼图中的刻度和奇数文字 [英] Controlling ticks and odd text in a pie chart generated from a factor variable in ggplot2

问题描述

我正在使用以下代码生成一个简单的饼图:

I'm generating a simple pie chart with use of the code below:

data(mtcars)
mtcars$fac_var <- as.factor(mtcars$cyl)
require(ggplot2); require(ggthemes)

# Chart
pie_test <- ggplot(mtcars, aes(x = factor(1), fill = fac_var)) +
  geom_bar(width = 1) +
  coord_polar(theta = "y") +
  ggtitle("Title") +
  theme_pander() +
  scale_fill_tableau(name = "Something") +
  theme(axis.title = element_blank())

代码产生以下图表:

我有兴趣对上面的图表进行两个较小的修改:

I'm interested in introducing two minor modifications to the chart above:

1. 我要删除左侧中可见的图形 1 (在下图中以红色突出显示).
2. 我想使通向数字的线条更清晰地表达(在下图中以黑色突出显示).

1. I would like to remove the figure 1 visible on the left (highlighted in red in the picture below).
2. I would like to make the lines leading to to the figures more strongly pronounced (highlighted in black in the picture below).

所需的更改:

推荐答案

1.)摆脱"1-" 将主题编辑为:

1.) To get rid of the "1-" edit your theme to:

theme(axis.title = element_blank(),
      axis.ticks.y = element_blank(),
      axis.text.y = element_blank())

2.)要更改行，请将主题编辑为:

2.) To change the lines edit your theme to:

theme(axis.title = element_blank(), 
      axis.ticks.y = element_blank(),
      axis.text.y=element_blank(),
      panel.grid.major.y = element_line(size = 1, color="black", linetype = "solid"))

不是完美的解决方案，而是一种改进.饼图并不是传达数据的最佳选择.您可能要考虑条形图.如果您想进一步了解ggplot2饼图，请查看这篇文章.

Not a perfect solution but an improvement. Pie charts are not the best for conveying data. You may want to consider a bar chart. If you want more help with ggplot2 pie charts check out this post.

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