Function facetSelectionPolygons

packages/sanddance/src/axisSelection.ts:113–131

(facetRects: VegaDeckGl.types.FacetRect[])

}

function facetSelectionPolygons(facetRects: VegaDeckGl.types.FacetRect[]) {
    const polygons: SelectPolygon[] = [];
    const linesAndSearches: { lines: VegaDeckGl.types.StyledLine[], search: SearchExpressionGroup }[] = facetRects.map(({ datum, lines }, i) => {
        const group: SearchExpressionGroup = getSearchGroupFromVegaValue(datum[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: VegaDeckGl.types.StyledLine[]) {
    const points: number[][] = [];