Add BEVEL style for start and end caps of the polylines

[vladcioricagoogle]

This is needed for achieving a straight line between polylines with different colors. Current ButtCap is not joining the polylines in a smooth way because it leaves open spaces on curves.

[wangela]

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@vladcioricagoogle Thank you for opening this issue. 🙏
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[wangela]

After we merge #338 to upgrade to Maps SDK 18.1.0 which supports polyline customization, it will be easier to achieve this. The supported options in 18.1.0 for customizing start and end caps are ButtCap (default), RoundCap, SquareCap, and CustomCap. Would RoundCap satisfy your use case for curves?

[vladcioricagoogle]

Not really. current SDK already supports ButtCap RoundCap and SquareCap but it doesn't know how to join polylines with different colours in curves for the ButtCap. We will need something similar to what Google Maps is doing for drawing polylines with traffic mode on (where there are multiple colors). Can we achieve something like that for this SDK?

[wangela]

The best place to request a BevelCap type is in the Issue Tracker for Maps SDK for Android. In the meantime, if you need it sooner, you can generate CustomCap bitmaps that meet your needs.

[wangela]

Just a note, the current draft implementation for Polylines selects ButtCap; we may need a separate PR to support all cap types. Up to @lenoch0d if you want to add cap types to #308.