@hackerrank/excalidraw

This is a fork of @excalidraw/excalidraw package maintained by HackerDraw Team.

If you're planning to embed Excalidraw whiteboard in your project maintained by the Excalidraw team, please refer to : https://npmjs.com/@excalidraw/excalidraw.

Excalidraw

Excalidraw exported as a component to directly embed in your projects.

Installation

You can use npm

npm install react react-dom @hackerrank/excalidraw

or via yarn

yarn add react react-dom @hackerrank/excalidraw

After installation you will see a folder excalidraw-assets and excalidraw-assets-dev in dist directory which contains the assets needed for this app in prod and dev mode respectively.

Move the folder excalidraw-assets and excalidraw-assets-dev to the path where your assets are served.

By default it will try to load the files from https://unpkg.com/@excalidraw/excalidraw/dist/

If you want to load assets from a different path you can set a variable window.EXCALIDRAW_ASSET_PATH depending on environment (for example if you have different URL's for dev and prod) to the url from where you want to load the assets.

Note

If you don't want to wait for the next stable release and try out the unreleased changes you can use @excalidraw/excalidraw-next.

Demo

Try here.

Usage

Using Web Bundler

If you are using a Web bundler (for instance, Webpack), you can import it as an ES6 module as shown below

import React, { useEffect, useState, useRef } from "react";
import Excalidraw from "@excalidraw/excalidraw";
import InitialData from "./initialData";

import "./styles.scss";

export default function App() {
  const excalidrawRef = useRef(null);

  const [viewModeEnabled, setViewModeEnabled] = useState(false);
  const [zenModeEnabled, setZenModeEnabled] = useState(false);
  const [gridModeEnabled, setGridModeEnabled] = useState(false);

  const updateScene = () => {
    const sceneData = {
      elements: [
        {
          type: "rectangle",
          version: 141,
          versionNonce: 361174001,
          isDeleted: false,
          id: "oDVXy8D6rom3H1-LLH2-f",
          fillStyle: "hachure",
          strokeWidth: 1,
          strokeStyle: "solid",
          roughness: 1,
          opacity: 100,
          angle: 0,
          x: 100.50390625,
          y: 93.67578125,
          strokeColor: "#c92a2a",
          backgroundColor: "transparent",
          width: 186.47265625,
          height: 141.9765625,
          seed: 1968410350,
          groupIds: [],
        },
      ],
      appState: {
        viewBackgroundColor: "#edf2ff",
      },
    };
    excalidrawRef.current.updateScene(sceneData);
  };

  return (
    <div className="App">
      <h1> Excalidraw Example</h1>
      <div className="button-wrapper">
        <button className="update-scene" onClick={updateScene}>
          Update Scene
        </button>
        <button
          className="reset-scene"
          onClick={() => {
            excalidrawRef.current.resetScene();
          }}
        >
          Reset Scene
        </button>
        <label>
          <input
            type="checkbox"
            checked={viewModeEnabled}
            onChange={() => setViewModeEnabled(!viewModeEnabled)}
          />
          View mode
        </label>
        <label>
          <input
            type="checkbox"
            checked={zenModeEnabled}
            onChange={() => setZenModeEnabled(!zenModeEnabled)}
          />
          Zen mode
        </label>
        <label>
          <input
            type="checkbox"
            checked={gridModeEnabled}
            onChange={() => setGridModeEnabled(!gridModeEnabled)}
          />
          Grid mode
        </label>
      </div>
      <div className="excalidraw-wrapper">
        <Excalidraw
          ref={excalidrawRef}
          initialData={InitialData}
          onChange={(elements, state) =>
            console.log("Elements :", elements, "State : ", state)
          }
          onPointerUpdate={(payload) => console.log(payload)}
          onCollabButtonClick={() =>
            window.alert("You clicked on collab button")
          }
          viewModeEnabled={viewModeEnabled}
          zenModeEnabled={zenModeEnabled}
          gridModeEnabled={gridModeEnabled}
        />
      </div>
    </div>
  );
}

To view the full example visit :point_down:

Since Excalidraw doesn't support server side rendering yet, you should render the component once the host is mounted.

import { useState, useEffect } from "react";
export default function IndexPage() {
  const [Comp, setComp] = useState(null);
  useEffect(() => {
    import("@excalidraw/excalidraw").then((comp) => setComp(comp.default));
  }, []);
  return <>{Comp && <Comp />}</>;
}

The types are available at @excalidraw/excalidraw/types, you can view example for typescript

In Browser

To use it in a browser directly:

For development use :point_down:

<script
  type="text/javascript"
  src="https://unpkg.com/@excalidraw/excalidraw/dist/excalidraw.development.js"
></script>

For production use :point_down:

<script
  type="text/javascript"
  src="https://unpkg.com/@excalidraw/excalidraw/dist/excalidraw.production.min.js"
></script>

You will need to make sure react, react-dom is available as shown in the below example. For prod please use the production versions of react, react-dom.

<!DOCTYPE html>
<html>
  <head>
    <title>Excalidraw in browser</title>
    <meta charset="UTF-8" />
    <script src="https://unpkg.com/[email protected]/umd/react.development.js"></script>
    <script src="https://unpkg.com/[email protected]/umd/react-dom.development.js"></script>

    <script
      type="text/javascript"
      src="https://unpkg.com/@excalidraw/excalidraw/dist/excalidraw.development.js"
    ></script>
  </head>

  <body>
    <div class="container">
      <h1>Excalidraw Embed Example</h1>
      <div id="app"></div>
    </div>
    <script type="text/javascript" src="src/index.js"></script>
  </body>
</html>

/*eslint-disable */
import "./styles.css";
import InitialData from "./initialData";

const App = () => {
  const excalidrawRef = React.useRef(null);

  const [viewModeEnabled, setViewModeEnabled] = React.useState(false);
  const [zenModeEnabled, setZenModeEnabled] = React.useState(false);
  const [gridModeEnabled, setGridModeEnabled] = React.useState(false);

  const updateScene = () => {
    const sceneData = {
      elements: [
        {
          type: "rectangle",
          version: 141,
          versionNonce: 361174001,
          isDeleted: false,
          id: "oDVXy8D6rom3H1-LLH2-f",
          fillStyle: "hachure",
          strokeWidth: 1,
          strokeStyle: "solid",
          roughness: 1,
          opacity: 100,
          angle: 0,
          x: 100.50390625,
          y: 93.67578125,
          strokeColor: "#c92a2a",
          backgroundColor: "transparent",
          width: 186.47265625,
          height: 141.9765625,
          seed: 1968410350,
          groupIds: [],
        },
      ],
      appState: {
        viewBackgroundColor: "#edf2ff",
      },
    };
    excalidrawRef.current.updateScene(sceneData);
  };

  return React.createElement(
    React.Fragment,
    null,
    React.createElement(
      "div",
      { className: "button-wrapper" },
      React.createElement(
        "button",
        {
          className: "update-scene",
          onClick: updateScene,
        },
        "Update Scene",
      ),
      React.createElement(
        "button",
        {
          className: "reset-scene",
          onClick: () => excalidrawRef.current.resetScene(),
        },
        "Reset Scene",
      ),
      React.createElement(
        "label",
        null,
        React.createElement("input", {
          type: "checkbox",
          checked: viewModeEnabled,
          onChange: () => setViewModeEnabled(!viewModeEnabled),
        }),
        "View mode",
      ),
      React.createElement(
        "label",
        null,
        React.createElement("input", {
          type: "checkbox",
          checked: zenModeEnabled,
          onChange: () => setZenModeEnabled(!zenModeEnabled),
        }),
        "Zen mode",
      ),
      React.createElement(
        "label",
        null,
        React.createElement("input", {
          type: "checkbox",
          checked: gridModeEnabled,
          onChange: () => setGridModeEnabled(!gridModeEnabled),
        }),
        "Grid mode",
      ),
    ),
    React.createElement(
      "div",
      {
        className: "excalidraw-wrapper",
        ref: excalidrawWrapperRef,
      },
      React.createElement(Excalidraw.default, {
        initialData: InitialData,
        onChange: (elements, state) =>
          console.log("Elements :", elements, "State : ", state),
        onPointerUpdate: (payload) => console.log(payload),
        onCollabButtonClick: () => window.alert("You clicked on collab button"),
        viewModeEnabled: viewModeEnabled,
        zenModeEnabled: zenModeEnabled,
        gridModeEnabled: gridModeEnabled,
      }),
    ),
  );
};

const excalidrawWrapper = document.getElementById("app");

ReactDOM.render(React.createElement(App), excalidrawWrapper);

To view the full example visit :point_down:

Customizing styles

Excalidraw is using CSS variables to style certain components. To override them, you should set your own on the .excalidraw and .excalidraw.theme--dark (for dark mode variables) selectors.

Make sure the selector has higher specificity, e.g. by prefixing it with your app's selector:

.your-app .excalidraw {
  --color-primary: red;
}
.your-app .excalidraw.theme--dark {
  --color-primary: pink;
}

Most notably, you can customize the primary colors, by overriding these variables:

• --color-primary
• --color-primary-darker
• --color-primary-darkest
• --color-primary-light
• --color-primary-contrast-offset — a slightly darker (in light mode), or lighter (in dark mode) --color-primary color to fix contrast issues (see Chubb illusion). It will fall back to --color-primary if not present.

For a complete list of variables, check theme.scss, though most of them will not make sense to override.

Props

| Name | Type | Default | Description | | --- | --- | --- | --- | | onChange | Function | | This callback is triggered whenever the component updates due to any change. This callback will receive the excalidraw elements and the current app state. | | initialData | {elements?: ExcalidrawElement[], appState?: AppState } | null | The initial data with which app loads. | | ref | createRef | useRef | callbackRef | { current: { readyPromise: resolvablePromise } } | | Ref to be passed to Excalidraw | | onCollabButtonClick | Function | | Callback to be triggered when the collab button is clicked | | isCollaborating | boolean | | This implies if the app is in collaboration mode | | onPointerUpdate | Function | | Callback triggered when mouse pointer is updated. | | langCode | string | en | Language code string | | renderTopRightUI | Function | | Function that renders custom UI in top right corner | | renderFooter | Function | | Function that renders custom UI footer | | renderCustomStats | Function | | Function that can be used to render custom stats on the stats dialog. | | viewModeEnabled | boolean | | This implies if the app is in view mode. | | zenModeEnabled | boolean | | This implies if the zen mode is enabled | | gridModeEnabled | boolean | | This implies if the grid mode is enabled | | libraryReturnUrl | string | | What URL should libraries.excalidraw.com be installed to | | theme | THEME.LIGHT | THEME.LIGHT | THEME.LIGHT | The theme of the Excalidraw component | | name | string | | Name of the drawing | | UIOptions | { canvasActions: CanvasActions } | DEFAULT UI OPTIONS | To customise UI options. Currently we support customising canvas actions | | onPaste | (data: ClipboardData, event: ClipboardEvent | null) => boolean | | Callback to be triggered if passed when the something is pasted in to the scene | | detectScroll | boolean | true | Indicates whether to update the offsets when nearest ancestor is scrolled. | | handleKeyboardGlobally | boolean | false | Indicates whether to bind the keyboard events to document. | | onLibraryChange | (items: LibraryItems) => void | Promise<any> | | The callback if supplied is triggered when the library is updated and receives the library items. | | autoFocus | boolean | false | Implies whether to focus the Excalidraw component on page load | | generateIdForFile | (file: File) => string | Promise<string> | Allows you to override id generation for files added on canvas | | onLinkOpen | (element: NonDeletedExcalidrawElement, event: CustomEvent) | | This prop if passed will be triggered when link of an element is clicked |

Dimensions of Excalidraw

Excalidraw takes 100% of width and height of the containing block so make sure the container in which you render Excalidraw has non zero dimensions.

onChange

Every time component updates, this callback if passed will get triggered and has the below signature.

(excalidrawElements, appState, files) => void;

1.excalidrawElements: Array of excalidrawElements in the scene.

2.appState: AppState of the scene.

3. files: The [BinaryFiles](BinaryFiles which are added to the scene.

Here you can try saving the data to your backend or local storage for example.

initialData

This helps to load Excalidraw with initialData. It must be an object or a promise which resolves to an object containing the below optional fields.

| Name | Type | Description | | --- | --- | --- | | elements | ExcalidrawElement[] | The elements with which Excalidraw should be mounted. | | appState | AppState | The App state with which Excalidraw should be mounted. | | scrollToContent | boolean | This attribute implies whether to scroll to the nearest element to center once Excalidraw is mounted. By default, it will not scroll the nearest element to the center. Make sure you pass initialData.appState.scrollX and initialData.appState.scrollY when scrollToContent is false so that scroll positions are retained | | libraryItems | LibraryItems | This library items with which Excalidraw should be mounted. | | files | BinaryFiles | The files added to the scene. |

{
  "elements": [
    {
      "type": "rectangle",
      "version": 141,
      "versionNonce": 361174001,
      "isDeleted": false,
      "id": "oDVXy8D6rom3H1-LLH2-f",
      "fillStyle": "hachure",
      "strokeWidth": 1,
      "strokeStyle": "solid",
      "roughness": 1,
      "opacity": 100,
      "angle": 0,
      "x": 100.50390625,
      "y": 93.67578125,
      "strokeColor": "#000000",
      "backgroundColor": "transparent",
      "width": 186.47265625,
      "height": 141.9765625,
      "seed": 1968410350,
      "groupIds": []
    }
  ],
  "appState": { "zenModeEnabled": true, "viewBackgroundColor": "#AFEEEE" }
}

You might want to use this when you want to load excalidraw with some initial elements and app state.

ref

You can pass a ref when you want to access some excalidraw APIs. We expose the below APIs:

| API | signature | Usage | | --- | --- | --- | | ready | boolean | This is set to true once Excalidraw is rendered | | readyPromise | resolvablePromise | This promise will be resolved with the api once excalidraw has rendered. This will be helpful when you want do some action on the host app once this promise resolves. For this to work you will have to pass ref as shown here | | updateScene | (scene: sceneData) => void | updates the scene with the sceneData | | addFiles | (files: BinaryFileData) => void | add files data to the appState | | resetScene | ({ resetLoadingState: boolean }) => void | Resets the scene. If resetLoadingState is passed as true then it will also force set the loading state to false. | | getSceneElementsIncludingDeleted | () => ExcalidrawElement[] | Returns all the elements including the deleted in the scene | | getSceneElements | () => ExcalidrawElement[] | Returns all the elements excluding the deleted in the scene | | getAppState | () => AppState | Returns current appState | | history | { clear: () => void } | This is the history API. history.clear() will clear the history | | scrollToContent | (target?: ExcalidrawElement | ExcalidrawElement[]) => void | Scroll the nearest element out of the elements supplied to the center. Defaults to the elements on the scene. | | refresh | () => void | Updates the offsets for the Excalidraw component so that the coordinates are computed correctly (for example the cursor position). You don't have to call this when the position is changed on page scroll or when the excalidraw container resizes (we handle that ourselves). For any other cases if the position of excalidraw is updated (example due to scroll on parent container and not page scroll) you should call this API. | | importLibrary | (url: string, token?: string) => void | Imports library from given URL | | setToastMessage | (message: string) => void | This API can be used to show the toast with custom message. | | id | string | Unique ID for the excalidraw component. | | getFiles | () => files | This API can be used to get the files present in the scene. It may contain files that aren't referenced by any element, so if you're persisting the files to a storage, you should compare them against stored elements. |

readyPromise

Since plain object is passed as a ref, the readyPromise is resolved as soon as the component is mounted. Most of the time you will not need this unless you have a specific use case where you can't pass the ref in the react way and want to do some action on the host when this promise resolves. You can check the example for the usage.

updateScene

You can use this function to update the scene with the sceneData. It accepts the below attributes.

| Name | Type | Description | | --- | --- | --- | | elements | ImportedDataState["elements"] | The elements to be updated in the scene | | appState | ImportedDataState["appState"] | The appState to be updated in the scene. | | collaborators | Map<string, Collaborator> | The list of collaborators to be updated in the scene. | | commitToHistory | boolean | Implies if the history (undo/redo) should be recorded. Defaults to false. | | libraryItems | LibraryItems | The libraryItems to be update in the scene. |

addFiles

Adds supplied files data to the appState.files cache on top of existing files present in the cache.

onCollabButtonClick

This callback is triggered when clicked on the collab button in excalidraw. If not supplied, the collab dialog button is not rendered.

isCollaborating

This prop indicates if the app is in collaboration mode.

onPointerUpdate

This callback is triggered when mouse pointer is updated.

({ x, y }, button, pointersMap}) => void;

1.{x, y}: Pointer coordinates

2.button: The position of the button. This will be one of ["down", "up"]

3.pointersMap: pointers map of the scene

(exportedElements, appState, canvas) => void

1. exportedElements: An array of non deleted elements which needs to be exported.
2. appState: AppState of the scene.
3. canvas: The HTMLCanvasElement of the scene.

langCode

Determines the language of the UI. It should be one of the available language codes. Defaults to en (English). We also export default language and supported languages which you can import as shown below.

import { defaultLang, languages } from "@excalidraw/excalidraw";

| name | type | | --- | --- | | defaultLang | string | | languages | Language[] |

renderTopRightUI

A function returning JSX to render custom UI in the top right corner of the app.

renderFooter

A function returning JSX to render custom UI footer. For example, you can use this to render a language picker that was previously being rendered by Excalidraw itself (for now, you'll need to implement your own language picker).

renderCustomStats

A function that can be used to render custom stats (returns JSX) in the nerd stats dialog. For example you can use this prop to render the size of the elements in the storage.

viewModeEnabled

This prop indicates whether the app is in view mode. When supplied, the value takes precedence over intialData.appState.viewModeEnabled, the view mode will be fully controlled by the host app, and users won't be able to toggle it from within the app.

zenModeEnabled

This prop indicates whether the app is in zen mode. When supplied, the value takes precedence over intialData.appState.zenModeEnabled, the zen mode will be fully controlled by the host app, and users won't be able to toggle it from within the app.

gridModeEnabled

This prop indicates whether the shows the grid. When supplied, the value takes precedence over intialData.appState.gridModeEnabled, the grid will be fully controlled by the host app, and users won't be able to toggle it from within the app.

libraryReturnUrl

If supplied, this URL will be used when user tries to install a library from libraries.excalidraw.com. Defaults to window.location.origin + window.location.pathname. To install the libraries in the same tab from which it was opened, you need to set window.name (to any alphanumeric string) — if it's not set it will open in a new tab.

theme

This prop controls Excalidraw's theme. When supplied, the value takes precedence over intialData.appState.theme, the theme will be fully controlled by the host app, and users won't be able to toggle it from within the app. You can use THEME to specify the theme.

name

This prop sets the name of the drawing which will be used when exporting the drawing. When supplied, the value takes precedence over intialData.appState.name, the name will be fully controlled by host app and the users won't be able to edit from within Excalidraw.

UIOptions

This prop can be used to customise UI of Excalidraw. Currently we support customising only canvasActions. It accepts the below parameters

canvasActions

| Attribute | Type | Default | Description | | --- | --- | --- | --- | | changeViewBackgroundColor | boolean | true | Implies whether to show Background color picker | | clearCanvas | boolean | true | Implies whether to show Clear canvas button | | export | false | exportOpts | { saveFileToDisk: true } | This prop allows to customize the UI inside the export dialog. By default it shows the "saveFileToDisk". If this prop is false the export button will not be rendered. For more details visit exportOpts. | | loadScene | boolean | true | Implies whether to show Load button | | saveToActiveFile | boolean | true | Implies whether to show Save button to save to current file | | theme | boolean | true | Implies whether to show Theme toggle | | saveAsImage | boolean | true | Implies whether to show Save as image button |

exportOpts

The below attributes can be set in UIOptions.canvasActions.export to customize the export dialog. If UIOptions.canvasActions.export is false the export button will not be rendered.

| Attribute | Type | Default | Description | | --- | --- | --- | --- | | saveFileToDisk | boolean | true | Implies if save file to disk button should be shown | | onExportToBackend | (exportedElements: readonly NonDeletedExcalidrawElement[],appState: AppState,canvas: HTMLCanvasElement | null) => void | | This callback is triggered when the shareable-link button is clicked in the export dialog. The link button will only be shown if this callback is passed. | | renderCustomUI | (exportedElements: readonly NonDeletedExcalidrawElement[],appState: AppState,canvas: HTMLCanvasElement | null) => void | | This callback should be supplied if you want to render custom UI in the export dialog. |

onPaste

This callback is triggered if passed when something is pasted into the scene. You can use this callback in case you want to do something additional when the paste event occurs.

This callback must return a boolean value or a promise which resolves to a boolean value.

In case you want to prevent the excalidraw paste action you must return false, it will stop the native excalidraw clipboard management flow (nothing will be pasted into the scene).

importLibrary

Imports library from given URL. You should call this on hashchange, passing the addLibrary value if you detect it as shown below. Optionally pass a CSRF token to skip prompting during installation (retrievable via token key from the url coming from https://libraries.excalidraw.com).

useEffect(() => {
  const onHashChange = () => {
    const hash = new URLSearchParams(window.location.hash.slice(1));
    const libraryUrl = hash.get("addLibrary");
    if (libraryUrl) {
      excalidrawRef.current.importLibrary(libraryUrl, hash.get("token"));
    }
  };
  window.addEventListener("hashchange", onHashChange, false);
  return () => {
    window.removeEventListener("hashchange", onHashChange);
  };
}, []);

Try out the Demo to see it in action.

detectScroll

Indicates whether Excalidraw should listen for scroll event on the nearest scrollable container in the DOM tree and recompute the coordinates (e.g. to correctly handle the cursor) when the component's position changes. You can disable this when you either know this doesn't affect your app or you want to take care of it yourself (calling the refresh() method).

handleKeyboardGlobally

Indicates whether to bind keyboard events to document. Disabled by default, meaning the keyboard events are bound to the Excalidraw component. This allows for multiple Excalidraw components to live on the same page, and ensures that Excalidraw keyboard handling doesn't collide with your app's (or the browser) when the component isn't focused.

Enable this if you want Excalidraw to handle keyboard even if the component isn't focused (e.g. a user is interacting with the navbar, sidebar, or similar).

onLibraryChange

This callback if supplied will get triggered when the library is updated and has the below signature.

It is invoked with empty items when user clears the library. You can use this callback when you want to do something additional when library is updated for example persisting it to local storage.

id

The unique id of the excalidraw component. This can be used to identify the excalidraw component, for example importing the library items to the excalidraw component from where it was initiated when you have multiple excalidraw components rendered on the same page as shown in multiple excalidraw demo.

autoFocus

This prop implies whether to focus the Excalidraw component on page load. Defaults to false.

generateIdForFile

Allows you to override id generation for files added on canvas (images). By default, an SHA-1 digest of the file is used.

(file: File) => string | Promise<string>

onLinkOpen

This prop if passed will be triggered when clicked on link. To handle the redirect yourself (such as when using your own router for internal links), you must call event.preventDefault().

(element: ExcalidrawElement, event: CustomEvent<{ nativeEvent: MouseEvent }>) => void

Example:

const history = useHistory();

// open internal links using the app's router, but opens external links in
// a new tab/window
const onLinkOpen: ExcalidrawProps["onLinkOpen"] = useCallback(
  (element, event) => {
    const link = element.link;
    const { nativeEvent } = event.detail;
    const isNewTab = nativeEvent.ctrlKey || nativeEvent.metaKey;
    const isNewWindow = nativeEvent.shiftKey;
    const isInternalLink =
      link.startsWith("/") || link.includes(window.location.origin);
    if (isInternalLink && !isNewTab && !isNewWindow) {
      history.push(link.replace(window.location.origin, ""));
      // signal that we're handling the redirect ourselves
      event.preventDefault();
    }
  },
  [history],
);

Does it support collaboration ?

No, Excalidraw package doesn't come with collaboration built in, since the implementation is specific to each host app. We expose APIs which you can use to communicate with Excalidraw which you can use to implement it. You can check our own implementation here.

Restore utilities

restoreAppState

Signature

How to use

import { restoreAppState } from "@excalidraw/excalidraw";

This function will make sure all the keys have appropriate values in appState and if any key is missing, it will be set to default value.

When localAppState is supplied, it's used in place of values that are missing (undefined) in appState instead of defaults. Use this as a way to not override user's defaults if you persist them. Required: supply null/undefined if not applicable.

restoreElements

Signature

How to use

import { restoreElements } from "@excalidraw/excalidraw";

This function will make sure all properties of element is correctly set and if any attribute is missing, it will be set to default value.

When localElements are supplied, they are used to ensure that existing restored elements reuse version (and increment it), and regenerate versionNonce. Use this when you import elements which may already be present in the scene to ensure that you do not disregard the newly imported elements if you're using element version to detect the updates.

restore

Signature

See restoreAppState() about localAppState, and restoreElements() about localElements.

How to use

import { restore } from "@excalidraw/excalidraw";

This function makes sure elements and state is set to appropriate values and set to default value if not present. It is a combination of restoreElements and restoreAppState.

Export utilities

exportToCanvas

Signature

| Name | Type | Default | Description | | --- | --- | --- | --- | | elements | Excalidraw Element [] | | The elements to be exported to canvas | | appState | AppState | defaultAppState | The app state of the scene | | getDimensions | (width: number, height: number) => { width: number, height: number, scale?: number } | undefined | A function which returns the width, height, and optionally scale (defaults 1), with which canvas is to be exported. | | maxWidthOrHeight | number | undefined | The maximum width or height of the exported image. If provided, getDimensions is ignored. | | files | [BinaryFiles](The BinaryFiles | undefined | The files added to the scene. |

How to use

import { exportToCanvas } from "@excalidraw/excalidraw";

This function returns the canvas with the exported elements, appState and dimensions.

exportToBlob

Signature

| Name | Type | Default | Description | | --- | --- | --- | --- | | opts | | | This param is passed to exportToCanvas. You can refer to exportToCanvas | | mimeType | string | "image/png" | Indicates the image format | | quality | number | 0.92 | A value between 0 and 1 indicating the image quality. Applies only to image/jpeg/image/webp MIME types. |

How to use

import { exportToBlob } from "@excalidraw/excalidraw";

Returns a promise which resolves with a blob. It internally uses canvas.ToBlob.

exportToSvg

Signature

| Name | Type | Default | Description | | --- | --- | --- | --- | | elements | Excalidraw Element [] | | The elements to exported as svg | | appState | AppState | defaultAppState | The app state of the scene | | exportPadding | number | 10 | The padding to be added on canvas | | files | [BinaryFiles](The BinaryFiles | undefined | The files added to the scene. |

This function returns a promise which resolves to svg of the exported drawing.

Additional attributes of appState for export\* APIs

| Name | Type | Default | Description | | --- | --- | --- | --- | | exportBackground | boolean | true | Indicates whether background should be exported | | viewBackgroundColor | string | #fff | The default background color | | exportWithDarkMode | boolean | false | Indicates whether to export with dark mode | | exportEmbedScene | boolean | false | Indicates whether scene data should be embedded in svg. This will increase the svg size. |

Extra API's

serializeAsJSON

Signature

Takes the scene elements and state and returns a JSON string. Deleted elementsas well as most properties from AppState are removed from the resulting JSON. (see serializeAsJSON() source for details).

getSceneVersion

How to use

This function returns the current scene version.

isInvisiblySmallElement

Signature

How to use

import { isInvisiblySmallElement } from "@excalidraw/excalidraw";

Returns true if element is invisibly small (e.g. width & height are zero).

loadLibraryFromBlob

import { loadLibraryFromBlob } from "@excalidraw/excalidraw";

Signature

This function loads the library from the blob.

loadFromBlob

How to use

import { loadFromBlob } from "@excalidraw/excalidraw";

Signature

This function loads the scene data from the blob. If you pass localAppState, localAppState value will be preferred over the appState derived from blob

getFreeDrawSvgPath

How to use

import { getFreeDrawSvgPath } from "@excalidraw/excalidraw";

Signature

This function returns the free draw svg path for the element.

isLinearElement

How to use

import { isLinearElement } from "@excalidraw/excalidraw";

Signature

This function returns true if the element is linear type (arrow |line) else returns false.

getNonDeletedElements

How to use

import { getNonDeletedElements } from "@excalidraw/excalidraw";

Signature

This function returns an array of deleted elements.

Exported constants

FONT_FAMILY

How to use

import { FONT_FAMILY } from "@excalidraw/excalidraw";

FONT_FAMILY contains all the font families used in Excalidraw as explained below

| Font Family | Description | | ----------- | -------------------- | | Virgil | The handwritten font | | Helvetica | The Normal Font | | Cascadia | The Code Font |

Defaults to FONT_FAMILY.Virgil unless passed in initialData.appState.currentItemFontFamily.

THEME

How to use

import { THEME } from "@excalidraw/excalidraw";

THEME contains all the themes supported by Excalidraw as explained below

| Theme | Description | | ----- | --------------- | | LIGHT | The light theme | | DARK | The Dark theme |

Defaults to THEME.LIGHT unless passed in initialData.appState.theme

Need help?

Check out the existing Q&A. If you have any queries or need help, ask us here.

Development

Install the dependencies

yarn

Start the server

yarn start

http://localhost:3001 will open in your default browser.

The example is same as the codesandbox example

Create a test release

You can create a test release by posting the below comment in your pull request

@excalibot release package

Once the version is released @excalibot will post a comment with the release version.