Add point.percentage property for solidgauge chart type

[vitaliy-kretsul]

This property is currently supported for stacked charts or pies. It would be convenient to have it for solid gauge chart type as well, considering that displaying gauge as a percentage is a pretty common use case.

[karolkolodziej]

Hi @vitaliy-kretsul.
Could you please elaborate on how the percentage value should be calculated for the solidgauge points?

In pie it is rather straightforward, you check the point.value / sumOfPointsInPie but I don't see how it should work in the solidgauge series.

[TorsteinHonsi]

I imagine it would make sense to calculate the percentage on the yAxis like this: https://jsfiddle.net/highcharts/fcwL4r9s/

This is quite simple to implement, I'll mark it good for beginners. Make sure it is implemented in the gauge series types, that the solid gauge inherits from.

[vitaliy-kretsul]

@karolkolodziej
I am not sure what is the best way to calculate it, but here is what I am doing currently to get percentage: https://jsfiddle.net/Cortez/7vtx5kmn/
The 'percentage' property is present on 'point' object, but it is undefined. But for pie chart it is there, and it is very convenient to use it.

[karolkolodziej]

Thank you @vitaliy-kretsul for additional feedback!

That is what I was hoping to see, now everything is clear!

[hubertkozik]

Closing as completed in #18448.