# Advanced examples

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## Resizing images

You can tell an image to shrink to or fill the screen by using [`r-stretch`](https://revealjs.com/layout/#stretch). Very handy if the image is too large or too small!

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You can also specify the exact height and width using HTML.

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- The HTML width/height sizes are relative to those specified in the `mkslides.yml` file.
  - These sizes are called the canvas sizes
  - In this example: `1920x1080`.
  - E.g.
    - an `img` with width `960` will take 50% of the width.
    - an `img` with height `540` will take 50% of the height.
  - When the browser is resized, Reveal.js wil take care of the scaling so you don't have to. You just do everything relative to the resolution set in `mkslides.yml`.

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## Video

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## Website

Anything that allows you to embed a website, you can use too:

You can scroll, zoom in/out, ... .

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Not all websites allow this unfortunately, so be sure to test it out in advance!

_Tip: some websites capture the keyboard, causing the arrow keys (or others) to not work anymore. E.g. cookie banners etc. ._

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## Mermaid Graphs

You can use [Mermaid](https://mermaid.js.org/intro/) graphs:

```mermaid
%%{
  init: {
    "flowchart": {
    },
  }
}%%

graph TD
    A[Enter Chart Definition] --> B(Preview)
    B --> C{decide}
    C --> D[Keep]
    C --> E[Edit Definition]
    E --> B
    D --> F[Save Image and Code]
    F --> B
```

This is done by the [Reveal.js Mermaid](https://github.com/zjffun/reveal.js-mermaid-plugin) plugin.

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## PlantUML Graphs

You can also use [PlantUML](https://plantuml.com/) graphs:

```language-plantuml
@startuml
scale 2
Alice -> Bob: Authentication Request
Bob --> Alice: Authentication Response
Alice -> Bob: Another authentication Request
Alice <-- Bob: Another authentication Response
@enduml
```

This is done by the [Reveal.js PlantUML](https://github.com/zjffun/reveal.js-mermaid-plugin) plugin.

_Tip: use PlantUML's `scale` to enlarge or shrink the graph._

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## Fragments

- Item 1 
- Item 2 
- Item 3

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## Fragments.

You can specify a custom order of appearance.

- Item 1 
- Item 2 
- Item 3

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## Custom background color

[Documentation](https://revealjs.com/backgrounds/)

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## Custom background image

[Documentation](https://revealjs.com/backgrounds/)

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## Multi-column slides

This defies the use of markdown, but if you really want it you can use some HTML and CSS magic:

- Bullet
  - Bullet
- Bullet
- Bullet

</div>

<div>

1. List
   1. List
2. List
3. List

</div>

<div>

Lorem ipsum dolor sit amet, consectetur adipiscing elit, ...

</div>

<div>

![](./img/hello.webp)

</div>

Based on [this StackOverflow post](https://stackoverflow.com/a/44392145).

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## Want to center something?

This defies the use of markdown, but if you really want it you can use some HTML and CSS magic:

![](./img/hello.webp)

</div>

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## Transitions

You can change the way slides transition from one to the next by setting the [`transition`](https://revealjs.com/transitions/) option in the `reveal.json` file.

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## Permanently show the notes

You can set the slideshow to permanently show the notes by setting the [`showNotes`](https://revealjs.com/speaker-view/) option in the `reveal.json` file.

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## And a lot more!

- https://github.com/HoGentTIN/hogent-revealmd
  - Inspired by the work of [Bert Van Vreckem](https://github.com/bertvv) at https://github.com/HoGentTIN/hogent-revealjs
- https://github.com/MartenBE/mkslides-reveal
- https://github.com/webpro/reveal-md
- https://revealjs.com/

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