feat(axis): enale boundaryGap for category axis

[xdbobname]

Brief Information

This pull request is in the type of:

• bug fixing
• new feature
• others

What does this PR do?

I'd like to align ending axis labels with the boundary, but the boundaryGap not suitable for category axis chart.

Fixed issues

#19636

Details

Before: What was the problem?

place axis label space-between

After: How does it behave after the fixing?

Document Info

One of the following should be checked.

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

Misc

ZRender Changes

• This PR depends on ZRender changes (ecomfe/zrender#xxx).

Related test cases or examples to use the new APIs

N.A.

Others

Merging options

• Please squash the commits into a single one when merging.

Other information

[echarts-bot]

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[echarts-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.

[github-actions]

The changes brought by this PR can be previewed at: https://echarts.apache.org/examples/editor?version=PR-19638@2821dbe

[Ovilia]

This seems to be more like some kind of margin/padding than boundaryGap to me, since its value is in pixels rather than the unit of the axis.

Consider the real world cases where this feature should be useful and add the cases in the test. And when you are clear about where this feature should be used, give it a better name (margin?pardding?offset?...) to isolate from boundaryGap.

[cooljser]

So great. I need this feature. There has a line chart on the top of page, and a bar chart on the bottom of page. Although there xAxis is different, i want to align the left xAxis.

[xdbobname]

So great. I need this feature. There has a line chart on the top of page, and a bar chart on the bottom of page. Although their xAxis is different, i want to align the left xAxis.

maybe you wannna say "left yAxis"? emmm, it has nothing to do with this pr, which customize the distance between yAxis and the line chart start point

[cooljser]

So great. I need this feature. There has a line chart on the top of page, and a bar chart on the bottom of page. Although their xAxis is different, i want to align the left xAxis.

maybe you wannna say "left yAxis"? emmm, it has nothing to do with this pr, which customize the distance between yAxis and the line chart start point

like this situation. I want to setting the gap between yAxis and bar.