围绕点放置边框 [英] Place a border around points

问题描述

我希望在散点图上的点上放置一个黑色边框，并使用ggplot2根据数据填充散点图。另外，我想避免为黑色边框添加图例条目，因为它会在每个点上。基本上我正在寻找这个情节，但是在每个点周围都有一个黑色边框。

  df < -  data.frame（id = runif（12），x = 1：12，y = runif（12 ））
 ggplot（df，aes（x = x，y = y））+ geom_point（aes（color = id），size = 12）
  

作为奖励，我希望没有黑色边框的图例条目。我最好的尝试是：

  df < -  data.frame（id = runif（12），x = 1：12， y = runif（12））
 ggplot（df，aes（x = x，y = y））+ geom_point（aes（fill = id，color =black），size = 12）
 
  $ b 
  
 
 
 
我不明白为什么这样做 t给我我想要的，更糟的是（对于我在ggplot2中的教育）我不明白为什么它似乎没有将填充颜色映射到任何东西！任何帮助？
 
 
 
也许如果我可以得到轮廓和填充映射的权利，我可以使用像最后一组数字此处可关闭图例。
解决方案
这有点模糊，但你必须使用 pch > 20（我认为21:25是相关的形状）： fill 控制内部colo（u）环和 color 控制边缘线。
 （g0 <-ggplot（df，aes（x = x，y = y））+ geom_point（aes（fill = id），
 color = black，pch = 21，size = 5））
  
 更新 ：使用最近的ggplot2版本（例如2.0.0，不知道它有多远），默认指南是一个色彩棒。需要 g0 +指南（fill =legend）才能获得带点的图例，如图所示。默认的休息时间也发生了变化：要精确地复制此图，您需要 g0 + scale_fill_continuous（guide =legend，breaks = seq（0.2,0.8，by = 0.1） ） ... 
 
 
 
  
 
 
 
相关但不完全相同：。这个问题被接受的答案使用@ joran的答案中显示的分层技术，但是（IMO）使用 pch = 21 技术的@jbaums的答案是优越的。 （我认为 shape = 21 是一种替代方案，可能甚至是首选， pch = 21 。）
 
 
 
你应该把 color  外映射（ aes  bit），如果你想绝对地设置它而不是根据某个变量的值... 
I'd like to place a black border around points on a scatterplot that are filled based on data, using ggplot2. Also, I would like to avoid having a legend entry for the black border since it will be on each point. Basically I'm looking for this plot, but with a black border around each point.  
df <- data.frame(id=runif(12), x=1:12, y=runif(12))
ggplot(df, aes(x=x, y=y))+geom_point(aes(colour=id), size=12)


As a bonus, I'd like to not have a legend entry for the black border. My best try is:
df <- data.frame(id=runif(12), x=1:12, y=runif(12))
ggplot(df, aes(x=x, y=y))+geom_point(aes(fill=id, colour="black"), size=12)
Which gives:



I don't understand why that doesn't give me what I want, and worse (for my education in ggplot2) I don't understand why it doesn't seem to map fill color to anything! Any help?

Perhaps if I can get the outline and fill mapping right I can use a hack like the one in hte last set of figures here to turn off the legend.
解决方案
It's a bit obscure, but you have to use pch>20 (I think 21:25 are the relevant shapes): fill controls the interior colo(u)ring and colour controls the line around the edge.
(g0 <- ggplot(df, aes(x=x, y=y))+geom_point(aes(fill=id), 
       colour="black",pch=21, size=5))
update: with recent ggplot2 versions (e.g. 2.0.0, don't know how far back it goes) the default guide is a colourbar.  Need g0 + guides(fill="legend") to get a legend with points as in the plot shown here.  The default breaks have changed, too: to exactly replicate this plot you need g0 + scale_fill_continuous(guide="legend",breaks=seq(0.2,0.8,by=0.1)) ...



Related but not identical: how to create a plot with customized points in R? . The accepted answer to that question uses the layering technique shown in @joran's answer, but (IMO) the answer by @jbaums, which uses the pch=21 technique, is superior. (I think shape=21 is an alternative, and perhaps even preferred, to pch=21.)

PS you should put colour outside the mapping (aes bit) if you want to set it absolutely and not according to the value of some variable ...

                        
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