Auto-generate legends with Labels as Venn-diagrams

[whatnick]

datacube-ows version: master
ows_config.py version/link:: dea-config

Description

Legends of layers using multi-band mapping functions are generate by hand.

What I would like to do

Autogenerate using Matplotlib patches venn diagrams like below for multi-band styles with correct labels.

style_tmad_rgb_std = {
    "name": "tmad_rgb_std",
    "title": "TMAD multi-band false-colour (standard)",
    "abstract": "Good for cropland and forest",
    "components": {
        "red": {
            "function": "datacube_ows.band_utils.single_band_arcsec",
            "mapped_bands": True,
            "kwargs": {
                "band": "sdev",
                "scale_from": [0.017, 0.15],
            },
        },
        "green": {
            "function": "datacube_ows.band_utils.single_band_offset_log",
            "mapped_bands": True,
            "kwargs": {
                "band": "edev",
                "scale_from": [0.025, 0.1],
            },
        },
        "blue": {
            "function": "datacube_ows.band_utils.single_band_offset_log",
            "mapped_bands": True,
            "kwargs": {
                "band": "bcdev",
                "scale_from": [0.025, 0.13],
            },
        },
    },