fix(axis): Show min/max split line for all axis types

[sebastianludwig]

Brief Information

This pull request is in the type of:

• bug fixing
• new feature
• others

What does this PR do?

Add the missing implementation of splitLine.showMinLine/.showMaxLine to radius, angle and single axis. Also add support for these properties to axisLine for polar angle axis.

Details

Before: What was the problem?

#20114 added splitLine.showMinLine and .showMaxLine and implemented it for the cartesian axis. The current documentation shows the option to be supported for other axis as well:

• https://echarts.apache.org/en/option.html#radiusAxis.splitLine.showMinLine
• https://echarts.apache.org/en/option.html#singleAxis.splitLine.showMinLine
• https://echarts.apache.org/en/option.html#angleAxis.splitLine.showMinLine

However there was simply no implementation in place. This PR fixes that.

Also, while on it, I also added support for these properties to axisLine for polar angle axis.

After: How does it behave after the fixing?

The split line fix

The axis line feature

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 doc: add angleAxis.showMinLine/showMaxLine echarts-doc#505

Misc

Security Checking

• This PR uses security-sensitive Web APIs.

ZRender Changes

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

Related test cases or examples to use the new APIs

N.A.

Merging options

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

Other information

This is my first PR in this repo. Please let me know if I missed some of the conventions.

[echarts-bot]

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[Justin-ZS]

Thanks for the PR. The overall direction looks good, and the splitLine coverage extension to radius/angle/single plus added test pages is very helpful. I left one inline comment on AngleAxisView for a possible category-axis boundary edge case. Other than that, this looks solid.

[sebastianludwig]

Good catch! I've implemented a test case showcasing the problem you foresaw

Next I changed the implementation as suggested to use radiusAxis.getExtent() directly and now the chart looks like this/correct: