Ability to group or somehow reduce the number of visible items

[vlsi]

Currently Group. _updateItemsInRange computes the set of visible items, however there's no way to customize the set of "actually visible" items there.

https://github.com/yotamberk/timeline-plus/blob/master/lib/timeline/component/Group.js#L851

It would be nice if that could be customized.
Possible use cases:

1. Show the heaviest ones. That is provide a callback so developer can pick the items to show
2. Merge items so reduce overall item count (like http://visjs.org/examples/network/other/clusteringByZoom.html ).

[yotamberk]

It's called clustering.
I'll consider a built in solution

[vlsi]

It's called clustering.

Is there a feature?
CHAP timeline had clustering, however the results were not that good.
On top of that, clustering was performed at render time, so if I put 100'000 items to the timeline, it just blows up.

I think it makes sense to pre-compute "clusters" (or whatever) and make timeline to use proper data set for each zoom level.

[yotamberk]

I agree this should be done.
(EDIT: Somebody has implemented something nice here: http://www.iftekhar.me/ibm/ibm-project-timeline/)
If it will interest anybody enough, it will be done.
For now, it's not on my priority list. If somebody wants to take this feature upon themselves, that would be great.

Right now, I am not free to do features that are not on my own priority if I don't get sponsored to do it.

[vlsi]

Right now, I am not free to do features that are not on my own priority if I don't get sponsored to do it.

@yotamberk , that makes perfect sense.

I'll keep issues to store findings related to the timeline if you don't mind.

[yotamberk]

Implemented and closed with #87