Touying (投影 in chinese, /tóuyǐng/, meaning projection) is an object-oriented and efficient package for creating presentation slides in Typst. Touying is a package derived from Polylux. Therefore, many concepts and APIs remain consistent with Polylux.

Touying provides an object-oriented programming (OOP) style syntax, allowing the simulation of “global variables” through a global singleton. This makes it easy to write themes. Touying does not rely on counter and locate to implement #pause, resulting in better performance.

If you like it, consider giving a star on GitHub. Touying is a community-driven project, feel free to suggest any ideas and contribute.

Document

Read the document to learn all about Touying.

This documentation is powered by Docusaurus. We will maintain English and Chinese versions of the documentation for Touying, and for each major version, we will maintain a documentation copy. This allows you to easily refer to old versions of the Touying documentation and migrate to new versions.

Special Features

1. #pause and #meanwhile Marks document

#slide[
  First
  
  #pause
  
  Second

  #meanwhile

  Third

  #pause

  Fourth
]

2. Dewdrop Theme Navigation Bar document

3. touying-equation Math Equation Animation document

4. #show: slides Style and #slide[..] Style document

5. Semi-transparent Cover Mode document

Quick start

Before you begin, make sure you have installed the Typst environment. If not, you can use the Web App or the Typst LSP and Typst Preview plugins for VS Code.

To use Touying, you only need to include the following code in your document:

#import "@preview/touying:0.2.1": *

#let (init, slide, slides) = utils.methods(s)
#show: init

#show: slides

= Title

== First Slide

Hello, Touying!

#pause

Hello, Typst!

It’s simple. Congratulations on creating your first Touying slide! 🎉

More Complex Examples

In fact, Touying provides various styles for writing slides. For example, the above example uses first-level and second-level titles to create new slides. However, you can also use the #slide[..] format to access more powerful features provided by Touying.

#import "@preview/touying:0.2.1": *

#let s = themes.metropolis.register(s, aspect-ratio: "16-9")
#let s = (s.methods.enable-transparent-cover)(self: s)
#let (init, slide) = utils.methods(s)
#show: init

// simple animations
#slide[
  a simple #pause *dynamic*

  #pause
  
  slide.

  #meanwhile

  meanwhile #pause with pause.
][
  second #pause pause.
]

// complex animations
#slide(setting: body => {
  set text(fill: blue)
  body
}, repeat: 3, self => [
  #let (uncover, only, alternatives) = utils.methods(self)

  in subslide #self.subslide

  test #uncover("2-")[uncover] function

  test #only("2-")[only] function

  #pause

  and paused text.
])

// math equation animations
#slide[
  == Touying Equation

  #touying-equation(`
    f(x) &= pause x^2 + 2x + 1  \
         &= pause (x + 1)^2  \
  `)

  #meanwhile

  Touying equation is very simple.
]

// multiple pages for one slide
#slide[
  == Multiple Pages for One Slide

  #lorem(200)
]

// appendix by freezing last-slide-number
#let s = (s.methods.appendix)(self: s)
#let (slide,) = utils.methods(s)

#slide[
  == Appendix
]

Acknowledgements

Thanks to…

• @andreasKroepelin for the polylux package
• @Enivex for the metropolis theme
• @drupol for the university theme
• @ntjess for contributing to fit-to-height, fit-to-width and cover-with-rect