在grid.draw中使用extrafont中的字体

时间:2017-01-01 05:12:03

标签: r ggplot2 fonts gtable

假设我有这样的数据集:

dat <- data.frame
  text = c(
    "It made me feel very positive to brand X", 
    "It was clear and easy to understand",
    "I didn't like it al all"),
  value=runif(3)
)

我可以使用extrafonts包中的 TradeGothic LT CondEighteen 字体在ggplot中绘图:

library(ggplot2)
p <- ggplot(dat, aes(text, value)) + 
     geom_bar(stat="identity") +
     coord_flip() +
     labs(title="     Do you agree with the following statements?")+
     theme_bw(16)+
     theme(text=element_text(family="TradeGothic LT CondEighteen"))

ggsave('plot.pdf', plot = plot,  path = "/Users/jacobdeecurtis/Desktop")

enter image description here

但是当我在剧情中使用ggplot_gtable时:

gt <- ggplot_gtable(ggplot_build(plot))
gt$layout[which(gt$layout$name == "title"), c("l", "r")] <- c(1,         max(gt$layout$r))
grid::grid.draw(plot)

ggsave('plot.pdf', plot = plot,  path = "/Users/jacobdeecurtis/Desktop")

运行grid.draw函数后出现错误。错误是:

Error in grid.Call(L_textBounds, as.graphicsAnnot(x$label), x$x, x$y,  : 
  polygon edge not found
In addition: Warning messages:
1: In grid.Call(L_textBounds, as.graphicsAnnot(x$label), x$x, x$y,  :
  no font could be found for family "TradeGothic LT CondEighteen"...

当我不使用 TradeGothic LT CondEighteen 字体时,我不会收到错误。

感谢您的帮助!

1 个答案:

答案 0 :(得分:7)

我,呃,&#34;恰巧有&#34;这个字体的副本,并extrafont::font_import()跳舞,并得到你的错误。但是,经过进一步检查:

library(purrr)

loadfonts()

pdfFonts() %>% 
  map_chr("family") %>% 
  keep(~grepl(".*Trade.*", .))
## [1] "TradeGothic LT CondEighteen"

似乎PDF设备想要这个名字。

虽然R有很多令人敬畏的东西,但它处理字体的方式与蜥蜴乌鸦(#atla)一样细致入微,友好可用。

<强>更新

完整示例(没有损坏的data.frame创建代码并引用plot vs p,实际grid.draw() ing gt vs plot或{修改ggplot gtable后的{1}}:

p

^^部分生成以下PDF(从预览中导出为PNG):

enter image description here

library(ggplot2)
library(grid)
library(extrafont)

dat <- data.frame(
  text = c(
    "It made me feel very positive to brand X", 
    "It was clear and easy to understand",
    "I didn't like it al all"),
  value=runif(3)
)

p <- ggplot(dat, aes(text, value)) + 
  geom_bar(stat="identity") +
  coord_flip() +
  labs(title="     Do you agree with the following statements?")+
  theme_bw(16)+
  theme(text=element_text(family="TradeGothic LT CondEighteen"))

loadfonts()

ggsave('plot.pdf', plot=p,  path="~/Desktop")

^^部分生成以下PDF(从预览中导出为PNG):

enter image description here

gt <- ggplot_gtable(ggplot_build(p))
gt$layout[which(gt$layout$name == "title"), c("l", "r")] <- c(1, max(gt$layout$r))

pdf("~/Desktop/plot.pdf")
grid::grid.draw(gt)
dev.off()

这里是来自RStudio的屏幕抓取(包括RStudio UI位以显示它在RStudio图形设备中):

enter image description here

很遗憾我们必须这样做(更改字体的命名约定,以便R演示代码的各个位可以选择正确的字体),但这是R中字体的当前状态。 / p>

我为公司的研究报告生成内容,并为屏幕(开发期间)和生产PDF生成(用于创意团队的最终输出切换)分别设置主题代码。这是一个令人沮丧的拐杖,但它确实有效。