Function createEdgeMapForCurveness

src/chart/helper/multipleGraphEdgeHelper.ts:146–165

(n1, n2, seriesModel, index)

 * @param {number} index
 */
export function createEdgeMapForCurveness(n1, n2, seriesModel, index) {
    if (!getAutoCurvenessParams(seriesModel)) {
        return;
    }

    const key = getKeyOfEdges(n1, n2, seriesModel);
    const edgeMap = seriesModel.__edgeMap;
    const oppositeEdges = edgeMap[getOppositeKey(key)];
    // set direction
    if (edgeMap[key] && !oppositeEdges) {
        edgeMap[key].isForward = true;
    }
    else if (oppositeEdges && edgeMap[key]) {
        oppositeEdges.isForward = true;
        edgeMap[key].isForward = false;
    }

    edgeMap[key] = edgeMap[key] || [];
    edgeMap[key].push(index);
}

/**
 * get curvature for edge