[Feature] A new tickMode is needed

[da730]

What problem does this feature solve?

axis.label.tick.tickMode must support a new mode.
the tick count is related with the height of axis. Higher axis will have more ticks.

What does the proposed API look like?

adding a new mode for tickMode
axis:{
label:{
tick:{
tickMode: 'auto'
}
}
}

or:
make the tickCount support callback function, in which user can get the height of the axis from the parameter and using their own formular to calculate the tick count.

[xiaoluoHe]

I would prefer the second option: tickcount supports custom function.

[kkxxkk2019]

I would prefer the second option: tickcount supports custom function.

yes, i agree with you.