feat(LineDraw):series-lines support the effect animation go back

[wangguisong]

Brief Information

This pull request is in the type of:

• bug fixing
• new feature
• others

What does this PR do?

add the effect.goback property in series-lines to enable the effect animation can go back to the starting point after reaching the destination. it`s necessary to indicates a round trip flight.

Fixed issues

Details

Before: What was the problem?

the effect animation in series-lines is one-way, can not indicates a round trip flight.

After: How is it fixed in this PR?

add the effect.goback property in series-lines to enable the effect animation can go back

Misc

• The API has been changed (apache/echarts-doc#xxx).
• 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]

Thanks for your contribution!
The community will review it ASAP. In the meanwhile, please checkout the coding standard and Wiki about How to make a pull request.

[pissang]

Wow looks great! Could we rename the option from goback to roundTrip to be more meaningful?

[wangguisong]

Wow looks great! Could we rename the option from goback to roundTrip to be more meaningful?

yes, of cause

[echarts-bot]

Congratulations! Your PR has been merged. Thanks for your contribution! 👍