Function initializeNodeDepth

src/chart/sankey/sankeyLayout.ts:308–350

* Compute the original y-position for each node

(
    nodesByBreadth: GraphNode[][],
    edges: GraphEdge[],
    height: number,
    width: number,
    nodeGap: number,
    orient: LayoutOrient
)

 * Compute the original y-position for each node
 */
function initializeNodeDepth(
    nodesByBreadth: GraphNode[][],
    edges: GraphEdge[],
    height: number,
    width: number,
    nodeGap: number,
    orient: LayoutOrient
) {
    let minKy = Infinity;
    zrUtil.each(nodesByBreadth, function (nodes) {
        const n = nodes.length;
        let sum = 0;
        zrUtil.each(nodes, function (node) {
            sum += node.getLayout().value;
        });
        const ky = orient === 'vertical'
                    ? (width - (n - 1) * nodeGap) / sum
                    : (height - (n - 1) * nodeGap) / sum;

        if (ky < minKy) {
            minKy = ky;
        }
    });

    zrUtil.each(nodesByBreadth, function (nodes) {
        zrUtil.each(nodes, function (node, i) {
            const nodeDy = node.getLayout().value * minKy;
            if (orient === 'vertical') {
                node.setLayout({x: i}, true);
                node.setLayout({dx: nodeDy}, true);
            }
            else {
                node.setLayout({y: i}, true);
                node.setLayout({dy: nodeDy}, true);
            }
        });
    });

    zrUtil.each(edges, function (edge) {
        const edgeDy = +edge.getValue() * minKy;
        edge.setLayout({dy: edgeDy}, true);
    });
}

/**
 * Resolve the collision of initialized depth (y-position)