在不改变字体大小的情况下控制字体粗细 [英] Control font thickness without changing font size

问题描述

我正在寻找一种方法来控制在 R 中绘制的文本的线条粗细，而不会改变字符的尺寸.这是一个示例(不使用 R):

I'm looking for a way to control the line thickness of text plotted in R without having the dimensions of the characters change. Here's an example (not using R):

中间字的厚度是顶部的两倍，但尺寸相同(因此没有发生缩放).最下面的字实际上是两个字:一个红色的字叠加在一个沉重的白色字上，以创建分色(对于注释繁忙的情节特别有用).

The middle word has a thickness of twice the top, yet the dimensions are the same (so no scaling happened). The bottom word is actually two words: a red word overlain on a heavy white word, to create color separation (especially useful for annotating a busy plot).

这是我拼凑起来的一组命令来尝试复制上图:

Here's a set of commands I threw together to try and replicate the figure above:

png("font.png",width=1.02, height=1.02, units="in", res=150)
par(ps=10, font=1, bg="light gray", col="black", mai=rep(0.02,4), pin=c(1,1))
plot.new()
box()
text(0.5,0.85,"FONT",cex=1)
text(0.5,0.6,"FONT",cex=2)
text(0.5,0.3,"FONT",cex=2,col="white")
text(0.5,0.3,"FONT",cex=1,col="red")
text(0.5,0.1,"FONT",cex=1, font=2, col="white")
text(0.5,0.1,"FONT",cex=1, font=1, col="red")
dev.off()

给予:

所以效果和把 font-face 改成粗体是一样的，只是大小差异不大，叠加的时候不明显.par 帮助页面似乎没有针对此的特定设置.有人有什么想法吗?

So the effect is the same as changing the font-face to bold, but the size difference is not big enough to be noticeable when overlain. The par help page doesn't appear to have a specific setting for this. Anyone have any ideas?

注意在 ggplot2 中更改 size 也不会产生我想要的效果，上次我检查过.

Note changing size in ggplot2 doesn't produce the effect I want either, last time I checked.

推荐答案

您可以尝试添加文本的多个版本，以圆形图案略微移动，

You could try adding multiple versions of the text slightly shifted in a circular pattern,

library(grid)
 stextGrob <- function (label, r=0.02, x = unit(0.5, "npc"), y = unit(0.5, "npc"), 
                        just = "centre", hjust = NULL, vjust = NULL, rot = 0, check.overlap = FALSE, 
                        default.units = "npc", name = NULL, gp = gpar(), vp = NULL){

   let <- textGrob("a", gp=gp, vp=vp)
   wlet <- grobWidth(let)
   hlet <- grobHeight(let)

   tg <- textGrob(label=label, x=x, y=y, gp=gpar(col="red"),
                  just = just, hjust = hjust, vjust = vjust, rot = rot,
                  check.overlap = check.overlap, 
                  default.units = default.units)

   tgl <- c(lapply(seq(0, 2*pi, length=36), function(theta){

     textGrob(label=label,x=x+cos(theta)*r*wlet,
              y=y+sin(theta)*r*hlet, gp=gpar(col="white"),
              just = just, hjust = hjust, vjust = vjust, rot = rot,
              check.overlap = check.overlap, 
              default.units = default.units)

     }), list(tg))


   g <- gTree(children=do.call(gList, tgl), vp=vp, name=name, gp=gp)

 }

 grid.stext <- function(...){
   g <- stextGrob(...)
   grid.draw(g)
   invisible(g)
 }

 grid.newpage()
 grid.rect(gp=gpar(fill="grey"))
 grid.stext("Yeah", gp=gpar(cex=4))

在 R-help 的档案中有一个使用基本图形的版本，它的灵感来自于此.

There's a version using base graphics lurking in the archives of R-help, from which this is inspired.

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