将本地目录中本地图像包含到Xaringan (remark.js)演示文稿中并调整其大小...(在mac上使用via Rstudio )

Question

我希望将本地目录中的图像/材料包含到Xaringan remark.js演示文稿中，并调整大小。我在mac上通过Rmd/Rstudio完成此操作。我希望能够自定义的大小与宏的建议，在Yihui's docs

用来调整大小的建议宏不适用于我。

添加行：

.center[![trachoma](picsfigs/trachoma.jpg)]

运行正常，但是添加beforeInit："macros.js“并将宏添加到该文件编织会产生一个空白演示文稿

---
title: "A Cool Presentation"
output:
  xaringan::moon_reader:
    css: [default, metropolis, metropolis-fonts]
    seal: true
    self_contained: true
    yolo: false
    beforeInit: "macros.js"
    nature:
      autoplay: 30000
---

- Hello world 

---

--- 

# new slide??

This works:


.center[![trachoma](picsfigs/trachoma.jpg)]

---

But this does not work:

.center[![:scale 50%](picsfigs/trachoma.jpg)]

Nor this

.center[![trachoma][:scale 50%](picsfigs/trachoma.jpg)]

one more slide

---

macros.js文件：

remark.macros.scale = function (percentage) {
  var url = this;
  return '<img src="' + url + '" style="width: ' + percentage + '" />';
};

Answer 1

您需要将beforeInit: "macros.js"放在nature下，如下所示。

---
title: "A Cool Presentation"
output:
  xaringan::moon_reader:
    css: [default, metropolis, metropolis-fonts]
    seal: true
    self_contained: true
    yolo: false
    nature:
      autoplay: 30000
      beforeInit: "macros.js"
---