[google_maps_flutter] Adds support for polygon overlays to the Google Maps plugin

[matthewlloyd]

Description

Adds support for polygon overlays to the Google Maps plugin

This is relatively trivial, requiring only some additional logic
to disambiguate click events between the various possible overlays.

Checklist

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• I read the [Contributor Guide] and followed the process outlined there for submitting PRs.
• My PR includes unit or integration tests for all changed/updated/fixed behaviors (See [Contributor Guide]).
• All existing and new tests are passing.
• I updated/added relevant documentation (doc comments with ///).
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• I read and followed the [Flutter Style Guide].
• The title of the PR starts with the name of the plugin surrounded by square brackets, e.g. [shared_preferences]
• I updated pubspec.yaml with an appropriate new version according to the [pub versioning philosophy].
• I updated CHANGELOG.md to add a description of the change.
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Breaking Change

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• Yes, this is a breaking change (please indicate a breaking change in CHANGELOG.md and increment major revision).
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[iskakaushik]

@matthewlloyd , I will have time to look at this only next week. We have Google I/O coming up. Sorry for the delay on this.

[matthewlloyd]

No rush, enjoy Google I/O! I'll be watching some of the live streams.

[andreyeurope]

Any update on this?

[matthewlloyd]

Still waiting for review. If you want to use it sooner, you can always fork my repo from https://github.com/matthewlloyd/plugins and switch to the polygon branch, then reference the fork in your pubspec.yaml like this:

  google_maps_flutter:
    path: plugins/packages/google_maps_flutter

Of course if you do this and build code on my version of the plugin, there's no guarantee the API won't change during the review before it gets merged, but I think that is unlikely.

[iskakaushik]

LGTM

[iskakaushik]

@matthewlloyd , I finally got a chance to take a look at this. Please fix the changelog and pubspec. Let's merge it :-)

[matthewlloyd]

Great! I'm AFK currently but will get it updated before tomorrow morning.

[sanekyy]

Hello. Why didn't you add support for holes in the polygons? It's just one more field (list of LatLng) in polygon model.

[matthewlloyd]

No technical reason not to do so, just a lack of time and not something I needed. I'm sure the Google team would be happy to review the addition if you submit a PR.

[sanekyy]

Okay, I'll try to do it.