react-phylogeny-tree-gl/lib/utils.js

React integration of phylocanvas.gl. Component and hook for phylogenetic tree visualistion.

import { useCallback, useRef } from 'react';
export function setRootNLevelsUp(tree, nodeID, noLevels = 6, minLeafToRootLength = 5) {
    let node;
    let upLength = 0;
    if (nodeID !== null) {
        node = tree.findNodeById(nodeID);
        if (node !== undefined) {
            upLength += node.branchLength;
            const noLevelsUp = noLevels >= 1 ? noLevels : 1;
            for (let i = 0; i < noLevelsUp; i++) {
                if ('parent' in node) {
                    upLength += node.parent.branchLength;
                    node = node.parent;
                }
                else
                    break;
            }
            while (upLength < minLeafToRootLength && 'parent' in node) {
                upLength += node.parent.branchLength;
                node = node.parent;
            }
        }
    }
    if (node)
        tree.setRoot(node.id);
}
export function useGetLatest(obj) {
    const ref = useRef();
    ref.current = obj;
    return useCallback(() => ref.current, []);
}
export const EmptyArray = [];
export function getNodeLeafOffspringsIDs(node) {
    if (node.isLeaf)
        return [node.id];
    const leafIDs = node.children.reduce((acc, child) => {
        const ids = getNodeLeafOffspringsIDs(child);
        return [...acc, ...ids];
    }, []);
    return leafIDs;
}
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