feat(pointer): add createPointerVelocity kinematics and momentum decay tracker

[deny-dz]

Summary

This PR introduces createPointerVelocity to @solid-primitives/pointer:

• Kinematic Pointer Velocity Tracking: Calculates instantaneous pointer velocity vectors (vx, vy, and scalar speed in pixels per second) from raw pointer movement deltas ($\vec{v} = \frac{\Delta \vec{p}}{\Delta t}$).
• Automatic Idle Momentum Decay: Automatically zeroes velocity when pointer movement pauses, essential for gesture inertia, fling physics, and interactive pan-zoom velocity calculations.

Changes

• packages/pointer/src/velocity.ts: createPointerVelocity implementation.
• packages/pointer/src/index.ts: Re-export velocity helpers.
• packages/pointer/test/velocity.test.ts: Vitest test suite.
• .changeset/pointer-velocity-momentum.md: Minor changeset.

[changeset-bot]

🦋 Changeset detected

Latest commit: 469ca1e

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@solid-primitives/pointer	Minor

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[coderabbitai]

Warning

Review limit reached

@deny-dz, you've reached your PR review limit, so we couldn't start this review.

Next review available in: 56 minutes

Limit details: You’ve used all 4 included reviews currently available.

You've used all free OSS reviews for now. Wait for the free limit to reset to keep reviewing this public repository.

How can I continue?

Wait for the limit to reset, then comment @coderabbitai review or push new commits to the PR.

An organization admin can change what happens after included review limits in Billing.

How do review limits work?

CodeRabbit enforces per-developer PR review limits within each organization.

For paid Pro and Pro+ reviews, CodeRabbit uses a developer's included PR review attempts over the past 7 days to set the current hourly allowance. At typical activity levels, the full plan allowance applies. Higher sustained activity can lower the allowance until earlier attempts leave the 7-day window.

Please refer docs for additional details.

Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 526eb836-1c79-4597-b11d-5555e34ac967

📥 Commits

Reviewing files that changed from the base of the PR and between c7b608c and 469ca1e.

📒 Files selected for processing (4)

• .changeset/pointer-velocity-momentum.md
• packages/pointer/src/index.ts
• packages/pointer/src/velocity.ts
• packages/pointer/test/velocity.test.ts

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands.}

[davedbase]

Hi there! Thank you for all the PRs. This is quite a bit of effort. These are all designed for our 1.0 primitives. I'm wondering how you'd like to have these ported to 2.0 though as that is mostly our primary focus moving forward. Would you like to adapt to both or perhaps lean into improving 2.0?

[deny-dz]

Hi @davedbase!

We're definitely leaning 100% into Solid 2.0. We'll update the PRs to match Solid 2.0 conventions (using onSettled and 2.0 reactive scheduling) as soon as we confirm the target branch (next).

[davedbase]

Hi @davedbase!

We're definitely leaning 100% into Solid 2.0. We'll update the PRs to match Solid 2.0 conventions (using onSettled and 2.0 reactive scheduling) as soon as we confirm the target branch (next).

Yes please, no main branch is currently Solid 1.0 support. The next branch is for Solid 2.0 support. You'll need to retarget that branch in all relevant PRs.