Function getEdgeMapLengthWithKey

src/chart/helper/multipleGraphEdgeHelper.ts:118–121

(key, seriesModel)

 * @param key
 */
const getEdgeMapLengthWithKey = function (key, seriesModel) {
    const edgeMap = seriesModel.__edgeMap;
    return edgeMap[key] ? edgeMap[key].length : 0;
};

/**
 * Count the number of edges between the same two points, used to obtain the curvature table and the parity of the edge