一幅图中两个图例之间的距离较小(例如颜色和尺寸比例) [英] Smaller gap between two legends in one plot (e.g. color and size scale)

问题描述

如何缩小一个绘图中两个参考线之间的距离.在下面的示例中，这两个指南来自颜色和尺寸比例，我想更改两者之间的距离，以使标题尺寸"恰好位于图例点的下方1.在这个例子中是有意义的，但是在我的实际应用中却可以.

how do I reduce the gap between two guides in one plot. In the example below, the two guides are from a color and size scale and I want to change the gap between the two so that the title 'size' is right below the legend-point for 1. Design-wise, it might not make sense in this example but in my actual application it does.

df=data.frame(x=rnorm(100),y=rnorm(100),color=factor(rbinom(100,1,0.5)),size=runif(100))
ggplot(df,aes(x=x,y=y,color=color,size=size)) + geom_point()

这是情节.我想使由绿线和箭头突出显示的间隙更小.

Here is the plot. I would like to make the gap highlighted by the green line and the arrow smaller.

推荐答案

我试图自定义legend或guide参数，但找不到解决方案.我希望使用ggplot2设置提供解决方案.

I tried to play to customize legend or guide parameters but I can't find a solution. I hope give a solution using ggplot2 settings.

这里有2个基于gtable和grid软件包的解决方案.

Here 2 solutions based on the gtable and grid packages.

对于gtable解决方案，代码是从问题.

for the gtable solution, the code is inspired from this question.

  library(gtable)
  # Data transformation
  data <- ggplot_build(p)
  gtable <- ggplot_gtable(data)
  # Determining index of legends table
  lbox <- which(sapply(gtable$grobs, paste) == "gtable[guide-box]")
  # changing the space between the 2 legends: here -0.5 lines
  guide <- gtable$grobs[[lbox]]
  gtable$grobs[[lbox]]$heights <- unit.c(guide$heights[1:2],
                                    unit(-.5,'lines'),  ## you can the GAP here
                                    guide$heights[4:5])
  # Plotting
  grid.draw(gtable)

类似于使用grid包(我们在图例的视口中重新绘制)

Similar using the grid package ( we redraw in the viewport of the legend)

pp <- grid.get('guide',grep=T)
 depth <- downViewport(pp$wrapvp$name)
 guide <- grid.get('guide',grep=T)
 grid.rect(gp=gpar(fill='white'))
 guide$heights <- unit.c(guide$heights[1:2],unit(-0.2,'lines'),guide$heights[4],unit(0.1,'lines'))
 grid.draw(guide)
 upViewport(depth)

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