Knitr中的Cairo字体大小 [英] Cairo font size in Knitr

问题描述

我正在尝试在Cairo设备中设置字体大小，但是pointsize参数似乎设置了图中点的大小，而不是字体大小.我有这个MWE:

I am trying to set the font size in a Cairo device, but the pointsize argument seems to set the size of the points in the plot, and not the font size. I have this MWE:

\documentclass{article}
\begin{document}
<<setup>>=
library(maptools)
data(meuse)
coordinates(meuse) <- c("x", "y")
proj4string(meuse) <- CRS("+init=epsg:28992")
@

<<fig1, dev='cairo_pdf', dev.args=list(family ="CMU Serif", pointsize=12), fig.keep='last'>>=
plot(meuse, pch=16)
legend("topleft", "Example Text")
@
<<fig2, dev='cairo_png',fig.ext='png',dev.args=list(family ="CMU Serif", pointsize=2), fig.keep='last'>>=
plot(meuse, pch=16)
legend("topleft", "Example Text")
@
\end{document}

fig1具有大的点和普通文本，而fig2具有相同的文本但小点.

fig1 has large points and normal text, and fig2 has identical text but tiny points.

推荐答案

在R基本图形中，字体大小通常是通过参数cex(.something)设置的.在这种情况下，您可以使用legend()函数的cex参数，例如

In R base graphics, the font size is usually set via the argument cex(.something). In this specific case, you can use the cex argument of the legend() function, e.g.

plot(meuse, pch=16)
legend("topleft", "Example Text", cex=2)

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