quarto-excalidraw

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quarto-excalidraw

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An extension to open an empty or existing Excalidraw canvas for RevealJS in Quarto

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# Excalidraw Extension For Quarto

Allows you to open up an empty [Excalidraw](https://github.com/excalidraw/excalidraw) canvas within your RevealJS presentation. Excalidraw is a virtual whiteboard for sketching hand-drawn like diagrams. It is similar to the [built-in chalkboard plugin](https://quarto.org/docs/presentations/revealjs/presenting.html#chalkboard) in Quarto. Excalidraw runs on your browser locally in your RevealJS presentation.

## Installing

```bash
quarto add parmsam/quarto-excalidraw
```

This will install the extension under the `_extensions` subdirectory.
If you're using version control, you will want to check in this directory.

## Using

Simply add the extension to the list of revealjs plugins like:

```yaml
title: "Excalidraw Example"
format:
    revealjs: default
revealjs-plugins:
  - excalidraw
```

Then all you have to do is click the 🎨 Artist Palette Emoji button to toggle the Excalidraw canvas. Excalidraw is running on your browser locally in your RevealJS presentation. Click on it again to return to your slides.

Alternatively, you can use the shortcut key to toggle the Excalidraw canvas. The default shortcut key is \` (backtick which is usually next to your 1 key).

```yaml
title: "Excalidraw Example"
format:
  revealjs:
      excalidraw:
        button: true
        shortcut: "`"
revealjs-plugins:
  - excalidraw
```

You can change the shortcut key by specifying the `shortcut` option in the configuration. You can also disable the button by setting the `button` option to `false`.

### Persistent Storage

You can enable automatic saving and loading of your drawings by setting `useLocalStorage: true`. This will save your work as you draw and restore it when you return to the presentation, making it easy to recover where you left off even if you refresh the page or close the browser.

```yaml
format:
  revealjs:
      excalidraw:
        useLocalStorage: true
```

### Templates and Libraries

There are other options you can specify in the configuration such as a reference Excalidraw file (see [template.excalidraw](template.excalidraw) for an example) to load in. You can create your own reference file by saving an Excalidraw file and then specifying the file path in `template` option. Ideally the file should be in the same directory as your Qmd file. Just be sure to include the file in the resources section of your YAML header. See [example.qmd](example.qmd) for an example of this in action.

You can do that same with [Excalidraw library files](https://github.com/excalidraw/excalidraw-libraries) like [Shinydraw](https://github.com/MikeJohnPage/shinydraw) using the `library` option.

```yaml
title: "Excalidraw Example"
format:
  revealjs:
      excalidraw:
        button: true
        shortcut: "`"
        template: "template.excalidraw"
        library: "library.excalidrawlib"
        langCode: "en"
        viewModeEnabled: false
        zenModeEnabled: false
        gridModeEnabled: false
        theme: "light"
        autoFocus: false
        useLocalStorage: true
revealjs-plugins: 
  - excalidraw
resources:
  - template.excalidraw
  - library.excalidrawlib
```

You can also specify the language code for the Excalidraw canvas, whether to enable view mode, zen mode, grid mode, and the theme. See the [Excalidraw documentation props page](https://docs.excalidraw.com/docs/@excalidraw/excalidraw/api/props/) for more information.

The `useLocalStorage` option enables automatic saving and loading of your Excalidraw drawings using the browser's localStorage. When enabled, your work will be automatically saved as you draw and restored when you return to the presentation. This is particularly useful for recovering your work if you accidentally refresh the page or close the browser. The data is stored locally in your browser and is specific to each presentation (based on the URL path).

## Example

Here is the source code for a minimal example: [example.qmd](example.qmd).

## Resources used

- https://docs.excalidraw.com/docs/@excalidraw/excalidraw/integration#browser
- https://docs.excalidraw.com/docs/@excalidraw/excalidraw/api/props/
- [Library to Prototype Shiny apps in Excalidraw](https://github.com/MikeJohnPage/shinydraw) from [MikeJohnPage](https://github.com/MikeJohnPage)

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