如何删除ggplot2图表中的边距 [英] How to remove margins in ggplot2 chart

问题描述

我目前正在使用ggplot2为乳胶文档创建图，并发现ggplot2增加了许多不必要的边距:

I am currently creating plots with ggplot2 for a latex document and discovered that ggplot2 adds many unwanted margins:

• 用 plot.background = element_rect(fill ="red")涂成红色:
  • 左边距很小
  • 图片和图例之间的空白很小
  • 左右边距
  • 底部有1px的边距

  还需要哪些规则来消除这些空白?用谷歌搜索所有这些配置选项确实很困难.这是我的实际图表:

  Which more rules are needed to remove these margins? It's really difficult to google all these configuration options. This is my actual chart:

  library(ggplot2)
  library(scales)
  label <- c("A", "B", "C", "D")
  value <- c(61, 26, 9, 4)
  values <- data.frame(label, value)
  myplot <- ggplot(values, aes(x = "", y=value, fill=label))
  myplot <- myplot + theme(legend.position="bottom")
  myplot <- myplot + labs(fill="")
  myplot <- myplot + geom_bar(stat="identity", width=1)
  myplot <- myplot + geom_text(
    aes(x=1.3, y=value/2+c(0, cumsum(value)[-length(value)])),
    label=percent(value/100),
    size=2
  )
  myplot <- myplot + coord_polar(theta="y")
  myplot <- myplot + theme(plot.background=element_rect(fill="red"))
  myplot <- myplot + theme(
    plot.margin=unit(c(0,0,0,0), "mm"),
    legend.margin=unit(0, "mm"),
    axis.title=element_blank(),
    axis.ticks=element_blank()
  )
  ggsave("pie.pdf")
  

  推荐答案

  您可以通过主题元素 axis.text 和 axis.tick.length <删除其余的轴空间./code>.

  You can remove the rest of the axis space via the theme elements axis.text and axis.tick.length.

  因此，您可以在主题代码中添加以下内容:

  So you'd add something like the following to your theme code:

  axis.text = element_blank(), axis.ticks.length = unit(0, "mm")
  

  在ggplot2的当前开发版本 ggplot2_2.1.0.9001 中，有一个新的主题元素 legend.box.spacing 在这里也可能有用，可以将其删除图例与图之间的所有空间: legend.box.spacing = unit(0，"mm").

  In the current development version of ggplot2, ggplot2_2.1.0.9001, there is a new theme element legend.box.spacing that could also be useful here to remove all space between the legend and the plot: legend.box.spacing = unit(0, "mm").

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