角度符号在地图轴标签中不正确 [英] degree symbol incorrect in map axis labels

问题描述

如果我使用 geom_sf 创建地图，则轴标签的度数符号错误.我得到的度数符号在文本中垂直居中，而不是像超级符号一样升起.

例如，

 库(sf)库(ggplot2)nc = st_read(system.file("shape/nc.shp"，package ="sf")))ggplot()+geom_sf(data = nc)+主题(axis.text = element_text(size = 16)) 

当我在网上看到示例时，它们通常看起来是正确的(例如，下图，复制自

我尝试使用 library(extrafont)更改字体，但是这个问题仍然存在于我尝试过的每种字体中.

更新

我不认为这是特定于ggplot的问题，因为对于在 plotmath 中使用 degree 关键字的任何图形，我都会得到相同的结果.例如

  par(mar = c(0,0,0,0))plot.new()文字(0.5,0.5，bquote(120 * degree * N)，cex = 5) 

我在 Linux (Kubuntu 19.04)， R 3.5.2， ggplot2 v.3.2.1， sf v.0.7-7.不知道可能还有其他信息，但是我可以使用其他要求的信息来更新答案.

解决方案

最终设法找到答案:

从X11开始，它说:

符号显示不正确的问题(例如quote(pi)和在具有以下功能的Linux系统上可以看到expression(10 ^ degree))安装了Wine Symbol字体–然后，fontconfig更喜欢此字体，并且误解了其编码.将以下行添加到〜/.fonts.conf"或"/etc/fonts/local.conf"可能会解决此问题首选URW Type 1符号字体.

 < fontconfig>< match target ="pattern">< test name ="family">< string>符号</string></test>< edit name ="family" mode ="prepend" binding ="same">< string>标准符号L</string></edit></match></fontconfig> 

将这些行添加到/etc/fonts/local.conf 中为我解决了这个问题.

If I create maps using geom_sf, the axis labels have the wrong symbol for degrees. I get degree symbols that are vertically centred in the text, rather than raised like superscipts.

For example,

library(sf)                                            
library(ggplot2)                                       
nc = st_read(system.file("shape/nc.shp", package="sf"))

ggplot() +                                             
  geom_sf(data = nc) +
  theme(axis.text = element_text(size=16))

When I see examples online, they typically look correct (e.g. image below, copied from here), so I guess it is related to something in my local setup.

I have tried changing font, using library(extrafont) but this problem remains in every font I tried.

Update

I don't think this is a ggplot-specific issue, as I get the same thing with any graphics that uses the degree keyword in plotmath. For example

par(mar=c(0,0,0,0))
plot.new()
text(0.5,0.5, bquote(120*degree*N), cex=5)

I am on Linux (Kubuntu 19.04), R 3.5.2, ggplot2 v. 3.2.1, sf v. 0.7-7. Not sure what other information might be relevant, but I can update answer with anything else that is requested.

解决方案

Finally managed to track down the answer:

From ?X11 it says:

Problems with incorrect rendering of symbols (e.g., of quote(pi) and expression(10^degree)) have been seen on Linux systems which have the Wine symbol font installed – fontconfig then prefers this and misinterprets its encoding. Adding the following lines to ‘~/.fonts.conf’ or ‘/etc/fonts/local.conf’ may circumvent this problem by preferring the URW Type 1 symbol font.

<fontconfig>
<match target="pattern">
  <test name="family"><string>Symbol</string></test>
  <edit name="family" mode="prepend" binding="same">
    <string>Standard Symbols L</string>
  </edit>
</match>
</fontconfig>

Adding these lines to /etc/fonts/local.conf solved the problem for me.

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