Prevent wobble during viewport following #3695
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@TodePond I've heavily refactored the viewport following code in this PR, mind doing a little QA to make sure I haven't broken any features/behaviour I wasn't aware of? |
ds300
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May 9, 2024
TodePond
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May 9, 2024
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Great stuff David, awesome that an issue like this revealed something so useful about how we do our syncing. |
steveruizok
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May 19, 2024
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May 20, 2024
follow up to #3695 ### Change Type <!-- ❗ Please select a 'Scope' label ❗️ --> - [ ] `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 - [x] `internal` — Does not affect user-facing stuff <!-- ❗ Please select a 'Type' label ❗️ --> - [ ] `bugfix` — Bug fix - [ ] `feature` — New feature - [ ] `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. - [x] `dunno` — I don't know ### Test Plan 1. Add a step-by-step description of how to test your PR here. 2. - [ ] Unit Tests - [ ] End to end tests ### Release Notes - Add a brief release note for your PR here.
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This revives the old 'derived camera' idea to prevent cursor wobbling during viewport following.
Before this PR we updated the camera on a tick during viewport following, but the shapes and cursors were not moving on the same tick (we tried that during the perf work and it was all kinds of problematic). Frankly I've forgotten how we ever managed to eliminate wobble here in the first place?
Anyway after this PR we derive the camera based on whether or not we are following a user. When you follow a user it makes it so that your viewport contains their viewport. If your viewport is not already very close to their viewport it will animate the initial position, after which it will 'lock' in place and the derived value will be used from then on.
This exposed a minor issue in our sync engine: the fact that we send presence updates in separate websocket messages from document updates. We get into situations like this
So to fix this I made it so that we can (and do) send presence updates in the same websocket messages as document updates so the server can handle them atomically.
Change Type
sdk— Changes the tldraw SDKbugfix— Bug fixTest Plan
Release Notes