Function facetSelectionPolygons

docs/app/js/sanddance-app.js:10208–10243

(facetRects)

    return polygons;
}
function facetSelectionPolygons(facetRects) {
    const polygons = [];
    const linesAndSearches = facetRects.map(({ datum , lines  }, i)=>{
        let group = (0, _search.getSearchGroupFromVegaValue)(datum[(0, _sanddanceSpecs.FieldNames).FacetSearch]);
        return {
            lines,
            search: group
        };
    });
    linesAndSearches.forEach(({ lines , search  }, i)=>{
        //take any 2 lines to get a box dimension
        const [x, y] = minMaxPoints(lines.slice(2));
        polygons.push({
            search,
            polygon: [
                [
                    x.min,
                    y.min
                ],
                [
                    x.max,
                    y.min
                ],
                [
                    x.max,
                    y.max
                ],
                [
                    x.min,
                    y.max
                ]
            ]
        });
    });
    return polygons;
}
function minMaxPoints(lines) {
    const points = [];
    lines.forEach((line)=>{