Segment functionality doesn't work for time axis or for data in not primitive form

[PavolSvidran]

Hi, yesterday i asked about some functionality described in #9396, response is fine and in theory it is what i need.

When i tried this segment solution i cannot make it work. I am using combination of time scale and data is in object form with props x,y where x is parsed from string. I tried to simulate it and my conclusion is that it realy doesnt work or there is somethink what i missed.

In the demo linked below, you can see two charts, where first one is with time x-scale and second with normal. Both have almost same config and as you can see in the first one it doesn't work. For both charts is segment function called, but only one respect it.

Demo: https://codepen.io/jBeater/pen/GRmoaYz

Browser: Chrome
ChartJS: 4.3.1

[kurkle]

The line is split in segments when the style changes. Your pen does not have any different styles.

So if you really have some segments, it works: https://codepen.io/kurkle/pen/OJmbYrO

The difference between the two charts is the NaN point that forces a break.

That different behavior should still be considered as a bug though.

[PavolSvidran]

Yea i think that segment should be every line between two points to allow customziations just like that i asked in #9396.
For now i dont know how to solve that issue, because my chart contains a lot of points, BE change is a lot of work (FE calculations, backward compatibility of cache, custom plugins update, etc.) and FE adjust of datasets is too much performance loss.

NaN for me means data loss in that point, not a segment change to allow customization :(

[etimberg]

It sounds like this would be solved by exposing the index of each point as #8985 requested. That way, the style functions could know where they are in the line.