Allow CirclesTechnique points size to be specified in metres and pixels

[LukeParky]

Discussed in #2256

In the source documentation it is stated that both SquaresTechnique and CirclesTechnique points are measured in pixels, but it is clear that SquaresTechnique is measured in metres. I would like the ability for CirclesTechniques to be measured in metres too.

I have linked a draft PR #2271 with some of my work to complete this but it is not in a ready state and I would appreciate help.

Original Discussion:

^{Originally posted by LukeParky August 3, 2021}
Hi all, loving harp.gl but I've run into something that appears possibly inconsistent in the documentation and I'd like some advice.

Using SquaresTechnique for points, the size attribute represents size in the geo reference frame, whereas for CirclesTechnique the size attribute represents size in pixels.
In the source code PointTechniqueParams states size is in pixels so SquaresTechnique appears to be inconsistent.

I want to render a circle with the size in the geo reference frame, so having the behaviour of SquaresTechnique but rendering a circle instead of a square. Is there a way to do this using the established square or circle techniques or will I need to do some calculations to convert pixel size to geo size?

[stale]

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