Customize inertia values from drag pan

[jinkwon]

mapbox-gl-js version:
Latest version

Steps to Trigger Behavior

No steps. :)

Expected Behavior

There is no way to customize velocity value.
https://github.com/mapbox/mapbox-gl-js/blob/master/src/ui/handler/drag_pan.js#L153

Actual Behavior

I need options to configure velocity value.

[peterqliu]

drag pan is set at a velocity such that the map position under the mouse stays constant throughout the panning motion. How would you propose a configurable velocity would work? Or do you mean the velocity after mouseup/touchend?

[mourner]

I guess we want these const values exposed as options. E.g. Leaflet allows their customization.

[jinkwon]

@mourner That's what I wanted. 👍

[1ec5]

Relatedly, on iOS, we abandoned these options in favor of a default inertial pan that lasts about one second regardless of the strength of the gesture (mapbox/mapbox-gl-native#1266), plus a decelerationRate option (mapbox/mapbox-gl-native#5504). The default was chosen for consistency with scroll views on that platform. It would be nice to be able to tailor the internal panning for touch devices (#949) differently than when using a mouse on a desktop platform.

[jinkwon]

Is there any working progress?

[mourner]

@jinkwon not at this moment, but we'd of course welcome a pull request.

[jinkwon]

@mourner OK. ;)

[ansis]

This was implemented a while back in #8887