273ba62e0e
Something was bothering me a bit with the discussion around sqrt's being slow. Looks like `Math.hypot` has a performance cost associated with it. Looking at the Chromium source code: https://chromium.googlesource.com/v8/v8/+/4.3.21/src/math.js?autodive=0%2F%2F#19 and https://source.chromium.org/chromium/chromium/src/+/main:v8/src/builtins/math.tq;l=36?q=math&sq=&ss=chromium%2Fchromium%2Fsrc:v8%2Fsrc%2F it looks like maybe we'd be avoiding the multiple arguments that can be passed into Math.hypot which is maybe the source of the perf hit. Also, interestingly in `math.tq` you can see it doing this funky sqrt calculation: `Float64Sqrt((a / max) * (a / max) + (b / max) * (b / max)) * max` - I think that possibly is trying to avoid some overflow in some cases with bigger numbers, but also possibly with a perf hit. [edit]: OK, actually on Firefox, doing sqrt seems slower - but digging more into this, it looks like doing `** 0.5` instead of `sqrt` is much faster. More related articles: - https://stackoverflow.com/questions/71898044/why-is-math-hypot-so-slow - https://stackoverflow.com/questions/3764978/why-hypot-function-is-so-slow - https://www.reddit.com/r/javascript/comments/wk3e57/askjs_why_mathsqrt_is_so_slow_in_firefox/ [edit again!] looks like this is being fixed in the latest Chrome! https://blog.seokho.dev/development/2024/03/18/V8-optimize-MathHypot.html ``` ┌─────────┬───────┬─────────┬─────────┬─────────┬────────┐ │ (index) │ Cold │ Slowest │ Fastest │ Average │ Total │ ├─────────┼───────┼─────────┼─────────┼─────────┼────────┤ │ old │ 13.39 │ 10.07 │ 9.69 │ 9.98 │ 998.57 │ │ sqrt │ 8.19 │ 6.66 │ 6.61 │ 6.67 │ 667.6 │ │ pow 0.5 │ 1.89 │ 0.28 │ 0.28 │ 0.3 │ 29.79 │ │ new │ 1.64 │ 0.28 │ 0.28 │ 0.29 │ 28.95 │ └─────────┴───────┴─────────┴─────────┴─────────┴────────┘ ``` ### Change Type <!-- ❗ Please select a 'Scope' label ❗️ --> - [x] `sdk` — Changes the tldraw SDK - [ ] `dotcom` — Changes the tldraw.com web app - [ ] `docs` — Changes to the documentation, examples, or templates. - [ ] `vs code` — Changes to the vscode plugin - [ ] `internal` — Does not affect user-facing stuff <!-- ❗ Please select a 'Type' label ❗️ --> - [ ] `bugfix` — Bug fix - [ ] `feature` — New feature - [x] `improvement` — Improving existing features - [ ] `chore` — Updating dependencies, other boring stuff - [ ] `galaxy brain` — Architectural changes - [ ] `tests` — Changes to any test code - [ ] `tools` — Changes to infrastructure, CI, internal scripts, debugging tools, etc. - [ ] `dunno` — I don't know |
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| CHANGELOG.md | ||
| CLA.md | ||
| CODE_OF_CONDUCT.md | ||
| CONTRIBUTING.md | ||
| lazy.config.ts | ||
| lerna.json | ||
| LICENSE.md | ||
| package.json | ||
| README.md | ||
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tldraw
Welcome to the public monorepo for tldraw. tldraw is a library for creating infinite canvas experiences in React. It's the software behind the digital whiteboard tldraw.com.
- Read the docs and learn more at tldraw.dev.
- Learn about our license.
Installation
npm i tldraw
Usage
import { Tldraw } from 'tldraw'
import 'tldraw/tldraw.css'
export default function App() {
return (
<div style={{ position: 'fixed', inset: 0 }}>
<Tldraw />
</div>
)
}
Learn more at tldraw.dev.
Local development
The local development server will run our examples app. The basic example will show any changes you've made to the codebase.
To run the local development server, first clone this repo.
Install dependencies:
yarn
Start the local development server:
yarn dev
Open the example project at localhost:5420.
License
tldraw's source code and distributed packages are provided under the non-commercial tldraw license.
This license does not permit commercial use. If you wish to use tldraw in a commercial product or enterprise, you will need to purchase a commercial license. To obtain a commercial license, please contact us at sales@tldraw.com.
To learn more, see our license page.
Trademarks
The tldraw name and logo are trademarks of tldraw. Please see our trademark guidelines for info on acceptable usage.
Community
Have questions, comments or feedback? Join our discord or start a discussion.
Contribution
Please see our contributing guide. Found a bug? Please submit an issue.
Contributors
Star History
Contact
Find us on Twitter at @tldraw or email sales@tldraw.com. You can also join our discord for quick help and support.