David Luzar a918648012 feat(packages/excalidraw): add renderOverrides to allow overriding of element rendering (#12100)
* feat(packages/excalidraw): add renderOverrides to allow overriding rendering of elements

* refactor(renderer): centralize overrides and inherit label offsets

* fix(renderer): preserve frame-name editing during visual overrides

* perf(renderer): limit override culling to translated elements

* fix(renderer): keep frame-title hit bounds at document positions

* fix(renderer): skip clearing an already clear override snapshot

`setElementRenderOverrides(null)` (or an empty map) on an editor whose
snapshot is already empty no longer copies, derives offsets or schedules a
render. Every other submission still repaints, equivalent ones included:
a value comparison would cost about as much as the copy it saves on every
changing frame, so hosts are told to submit only on change and to dedupe
at their own level, where the snapshot's structure is known.

Fable 5.1, medium reasoning

* refactor(renderer): drop two override edge cases

Culling no longer keeps an off-screen container alive because its bound
label alone would be in view: the label follows its container, as it does
for document culling, and the case needed a label wider than its (short
arrow) container at the viewport edge during a translation.

Frame clipping no longer tracks whether an element carries an explicit
offset entry (`hasPositionOverride`); a non-zero offset is what matters.
An explicit zero offset leaves the element at rest, where the ordinary
overlap check already decides correctly.

Fable 5.1, medium reasoning

* perf(renderer): leave bound-label entries out of override culling

A bound label is drawn with its container and its own entry in the visible
list is skipped by the static renderer, so override culling has no reason
to adjust that entry. Doing so made a visible container whose label is
document-off-screen (a long arrow with its label past the viewport) report
the label as newly visible on every translation, which rebuilt the visible
set from the whole scene each frame. Translated elements now update only
their own membership; the label lookup per translated element goes too.

Fable 5.1, medium reasoning
2026-09-15 14:12:53 +02:00
2024-08-06 13:21:20 +02:00
2020-04-03 19:19:01 +02:00
2024-09-09 17:12:07 +02:00
2020-09-15 21:59:00 +02:00
2025-05-25 21:23:40 +02:00
2023-05-18 16:06:27 +02:00
2025-05-25 21:23:40 +02:00
2020-01-05 13:09:29 -08:00

Excalidraw

Excalidraw Editor | Blog | Documentation | Excalidraw+

An open source virtual hand-drawn style whiteboard.
Collaborative and end-to-end encrypted.


Excalidraw is released under the MIT license. npm downloads/month PRs welcome! Chat on Discord Ask DeepWiki Follow Excalidraw on Twitter

Product showcase

Create beautiful hand-drawn like diagrams, wireframes, or whatever you like.

Features

The Excalidraw editor (npm package) supports:

  • 💯 Free & open-source.
  • 🎨 Infinite, canvas-based whiteboard.
  • ✍️ Hand-drawn like style.
  • 🌓 Dark mode.
  • 🏗️ Customizable.
  • 📷 Image support.
  • 😀 Shape libraries support.
  • 🌐 Localization (i18n) support.
  • 🖼️ Export to PNG, SVG & clipboard.
  • 💾 Open format - export drawings as an .excalidraw json file.
  • ⚒️ Wide range of tools - rectangle, circle, diamond, arrow, line, free-draw, eraser...
  • ➡️ Arrow-binding & labeled arrows.
  • 🔙 Undo / Redo.
  • 🔍 Zoom and panning support.

Excalidraw.com

The app hosted at excalidraw.com is a minimal showcase of what you can build with Excalidraw. Its source code is part of this repository as well, and the app features:

  • 📡 PWA support (works offline).
  • 🤼 Real-time collaboration.
  • 🔒 End-to-end encryption.
  • 💾 Local-first support (autosaves to the browser).
  • 🔗 Shareable links (export to a readonly link you can share with others).

We'll be adding these features as drop-in plugins for the npm package in the future.

Quick start

Note: following instructions are for installing the Excalidraw npm package when integrating Excalidraw into your own app. To run the repository locally for development, please refer to our Development Guide.

Use npm or yarn to install the package.

npm install react react-dom @excalidraw/excalidraw
# or
yarn add react react-dom @excalidraw/excalidraw

Check out our documentation for more details!

Contributing

Integrations

Who's integrating Excalidraw

Google Cloud • Meta • CodeSandbox • Obsidian Excalidraw • Replit • Slite • Notion • HackerRank • and many others

Sponsors & support

If you like the project, you can become a sponsor at Open Collective or use Excalidraw+.

Thank you for supporting Excalidraw

Last but not least, we're thankful to these companies for offering their services for free:

Vercel Sentry Crowdin

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Description
Virtual whiteboard for sketching hand-drawn like diagrams
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