Function axisSelectionPolygons

docs/app/js/sanddance-app.js:10158–10207

(axis, vertical, axisSelectionType, column)

    return polygonLayer;
}
function axisSelectionPolygons(axis, vertical, axisSelectionType, column) {
    const polygons = [];
    const size = 50;
    const getSearch = axisSelectionType === "exact" ? (a, c, i)=>({
            expressions: [
                (0, _expression.selectExactAxis)(a, c, i)
            ]
        }) : (0, _expression.selectBetweenAxis);
    const { domain , ticks  } = axis;
    if (ticks.length > 0 && domain) {
        const dim = vertical ? 1 : 0;
        const between = Math.abs(ticks[0].sourcePosition[dim] - domain.sourcePosition[dim]) > 1;
        let divisions;
        if (between) {
            divisions = [];
            for(let i = 1; i < ticks.length; i++)divisions.push((ticks[i].sourcePosition[dim] + ticks[i - 1].sourcePosition[dim]) / 2);
        } else divisions = ticks.slice(1, -1).map((tick)=>tick.sourcePosition[dim]);
        const add = (p2, i)=>{
            const coords = [
                [
                    p1,
                    q1
                ],
                [
                    p2,
                    q1
                ],
                [
                    p2,
                    q2
                ],
                [
                    p1,
                    q2
                ]
            ];
            polygons.push({
                search: getSearch(axis, column, i),
                polygon: vertical ? coords.map((xy)=>xy.reverse()) : coords
            });
            p1 = p2;
        };
        let p1 = domain.sourcePosition[dim];
        const q1 = domain.sourcePosition[vertical ? 0 : 1];
        const q2 = q1 - size;
        divisions.forEach(add);
        add(domain.targetPosition[dim], ticks.length - (between ? 1 : 2));
    }
    return polygons;
}
function facetSelectionPolygons(facetRects) {
    const polygons = [];
    const linesAndSearches = facetRects.map(({ datum , lines  }, i)=>{