feat(axis): provide splitLine.showMinLine and splitLine.showMaxLine. …

[MeetzhDing]

Brief Information

This pull request is in the type of:

• [ ] bug fixing
• [x] new feature
• [ ] others

What does this PR do?

Resolves #16946

provide splitLine.showMinLine and splitLine.showMaxLine.

When using xAxis[type=time], it allow user hide first/last splitLine.

uplot style:

After: How is it fixed in this PR?

Like showMinLabel/showMaxLabel, it add new option showMinLine adn showMaxLine.

Document Info

One of the following should be checked.

• [ ] This PR doesn't relate to document changes
• [x] The document should be updated later
• [ ] The document changes have been made in apache/echarts-doc#xxx

[echarts-bot[bot]]

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[pissang]

Please don't commit the files in the dist folder

[Ovilia]

I have some concern on this PR.

I think it may be a better idea to hide min/max line only if the first/last tick is not calculated by nice tick (which usually happens when the user deliberately sets a min/max value to the axis.

For example, in this demo, the min tick is -20 and it is expected to be displayed because -20 is a nice tick.

While in another case, the axis is set to have min: -22. In this case, the splitLine of -22 is expected to be hidden if showMinLine is set to be false.

I think this logic may make more sense. @pissang What do you think?

[MeetzhDing]

@Ovilia @pissang how to judge whether it is nice tick? Or is this any plan yet?

[Ovilia]

@MeetzhDing Sorry for the late reply. You can find the code here.

[MeetzhDing]

@Ovilia showMinLine type is boolean | 'auto' now

    // null/undefined (true) | true | false | 'auto' (true when nick tick only)
    showMinLine?: boolean | 'auto',
    // null/undefined (true) | true | false | 'auto' (true when nick tick only)
    showMaxLine?: boolean | 'auto',

[MeetzhDing]

@Ovilia please check pr again

[MeetzhDing]

@Ovilia please check pr again

[MeetzhDing]

@Ovilia please check again

[echarts-bot[bot]]

Document changes are required in this PR. Please also make a PR to apache/echarts-doc for document changes and update the issue id in the PR description. When the doc PR is merged, the maintainers will remove the PR: awaiting doc label.