Sg/area dist

[skygering]

Update and fully test the area and distance function.

[rafaqz]

Tests look great.

There are a lot of separate docs... I find it easier to read one doc string on a stub function covering all the methods of the function, rather than many separate per-method docs.

[rafaqz]

Suggested change

	return T(0)
	return zero(T)

[rafaqz]

Suggested change

	return T(0)
	return zero(T)

[rafaqz]

Underscore functions should have comments rather than docs

[rafaqz]

Probably this function could have all of the area docs.

[rafaqz]

And this one all of the signed_area docs

[rafaqz]

Suggested change

	area /= 2
	return area
	return area / 2

[skygering]

There are a lot of separate docs... I find it easier to read one doc string on a stub function covering all the methods of the function, rather than many separate per-method docs.

Okay! I combined all of the docs into the stub function and then organized the others with comments. Let me know if that is easier to read.

[skygering]

Also, the code that was originally in the file had the signed_distance from a point to a multipolygon as the maximum minimum distance from a point to an element of the multipolygon. But based on LibGEOS behavior (as shown in tests) and this description of Shapely behavior, I think it should be the minimum minimum distance from the point to an element of the multipolygon. But let me know what you think.

[rafaqz]

@asinghvi17 what do you think? I have no knowledge of signed distance algs to really comment on that

[rafaqz]

The minimum minimum does seem correct to me too, based on not very much

[skygering]

I feel good about merging it if you do @rafaqz. If someone disagrees with the algorithm we can always fix it later.