swOperation/node_modules/@antv/g2/esm/data/utils/d3-sankey/sankey.js

import { sum, max, min } from 'd3-array';
import { justify } from './align';
import { constant } from './constant';
function ascendingSourceBreadth(a, b) {
    return ascendingBreadth(a.source, b.source) || a.index - b.index;
}
function ascendingTargetBreadth(a, b) {
    return ascendingBreadth(a.target, b.target) || a.index - b.index;
}
function ascendingBreadth(a, b) {
    return a.y0 - b.y0;
}
function value(d) {
    return d.value;
}
function defaultId(d) {
    return d.index;
}
function defaultNodes(graph) {
    return graph.nodes;
}
function defaultLinks(graph) {
    return graph.links;
}
function find(nodeById, id) {
    const node = nodeById.get(id);
    if (!node)
        throw new Error('missing: ' + id);
    return node;
}
function computeLinkBreadths({ nodes }) {
    for (const node of nodes) {
        let y0 = node.y0;
        let y1 = y0;
        for (const link of node.sourceLinks) {
            link.y0 = y0 + link.width / 2;
            y0 += link.width;
        }
        for (const link of node.targetLinks) {
            link.y1 = y1 + link.width / 2;
            y1 += link.width;
        }
    }
}
export function Sankey() {
    let x0 = 0, y0 = 0, x1 = 1, y1 = 1; // extent
    let dx = 24; // nodeWidth
    let dy = 8, py; // nodePadding
    let id = defaultId;
    let align = justify;
    let depth;
    let sort;
    let linkSort;
    let nodes = defaultNodes;
    let links = defaultLinks;
    let iterations = 6;
    function sankey(arg) {
        const graph = {
            nodes: nodes(arg),
            links: links(arg),
        };
        computeNodeLinks(graph);
        computeNodeValues(graph);
        computeNodeDepths(graph);
        computeNodeHeights(graph);
        computeNodeBreadths(graph);
        computeLinkBreadths(graph);
        return graph;
    }
    sankey.update = function (graph) {
        computeLinkBreadths(graph);
        return graph;
    };
    sankey.nodeId = function (_) {
        return arguments.length
            ? ((id = typeof _ === 'function' ? _ : constant(_)), sankey)
            : id;
    };
    sankey.nodeAlign = function (_) {
        return arguments.length
            ? ((align = typeof _ === 'function' ? _ : constant(_)), sankey)
            : align;
    };
    sankey.nodeDepth = function (_) {
        return arguments.length
            ? ((depth = typeof _ === 'function' ? _ : _), sankey)
            : depth;
    };
    sankey.nodeSort = function (_) {
        return arguments.length ? ((sort = _), sankey) : sort;
    };
    sankey.nodeWidth = function (_) {
        return arguments.length ? ((dx = +_), sankey) : dx;
    };
    sankey.nodePadding = function (_) {
        return arguments.length ? ((dy = py = +_), sankey) : dy;
    };
    sankey.nodes = function (_) {
        return arguments.length
            ? ((nodes = typeof _ === 'function' ? _ : constant(_)), sankey)
            : nodes;
    };
    sankey.links = function (_) {
        return arguments.length
            ? ((links = typeof _ === 'function' ? _ : constant(_)), sankey)
            : links;
    };
    sankey.linkSort = function (_) {
        return arguments.length ? ((linkSort = _), sankey) : linkSort;
    };
    sankey.size = function (_) {
        return arguments.length
            ? ((x0 = y0 = 0), (x1 = +_[0]), (y1 = +_[1]), sankey)
            : [x1 - x0, y1 - y0];
    };
    sankey.extent = function (_) {
        return arguments.length
            ? ((x0 = +_[0][0]),
                (x1 = +_[1][0]),
                (y0 = +_[0][1]),
                (y1 = +_[1][1]),
                sankey)
            : [
                [x0, y0],
                [x1, y1],
            ];
    };
    sankey.iterations = function (_) {
        return arguments.length ? ((iterations = +_), sankey) : iterations;
    };
    function computeNodeLinks({ nodes, links }) {
        nodes.forEach((node, idx) => {
            node.index = idx;
            node.sourceLinks = [];
            node.targetLinks = [];
        });
        const nodeById = new Map(nodes.map((d) => [id(d), d]));
        links.forEach((link, idx) => {
            link.index = idx;
            let { source, target } = link;
            if (typeof source !== 'object')
                source = link.source = find(nodeById, source);
            if (typeof target !== 'object')
                target = link.target = find(nodeById, target);
            source.sourceLinks.push(link);
            target.targetLinks.push(link);
        });
        if (linkSort != null) {
            for (const { sourceLinks, targetLinks } of nodes) {
                sourceLinks.sort(linkSort);
                targetLinks.sort(linkSort);
            }
        }
    }
    function computeNodeValues({ nodes }) {
        for (const node of nodes) {
            node.value =
                node.fixedValue === undefined
                    ? Math.max(sum(node.sourceLinks, value), sum(node.targetLinks, value))
                    : node.fixedValue;
        }
    }
    function computeNodeDepths({ nodes }) {
        const n = nodes.length;
        let current = new Set(nodes);
        let next = new Set();
        let x = 0;
        while (current.size) {
            current.forEach((node) => {
                node.depth = x;
                for (const { target } of node.sourceLinks) {
                    next.add(target);
                }
            });
            if (++x > n)
                throw new Error('circular link');
            current = next;
            next = new Set();
        }
        // 如果配置了 depth，则设置自定义 depth
        if (depth) {
            const maxDepth = Math.max(max(nodes, (d) => d.depth) + 1, 0);
            let node;
            for (let i = 0; i < nodes.length; i++) {
                node = nodes[i];
                node.depth = depth.call(null, node, maxDepth);
            }
        }
    }
    function computeNodeHeights({ nodes }) {
        const n = nodes.length;
        let current = new Set(nodes);
        let next = new Set();
        let x = 0;
        while (current.size) {
            current.forEach((node) => {
                node.height = x;
                for (const { source } of node.targetLinks) {
                    next.add(source);
                }
            });
            if (++x > n)
                throw new Error('circular link');
            current = next;
            next = new Set();
        }
    }
    function computeNodeLayers({ nodes }) {
        const x = Math.max(max(nodes, (d) => d.depth) + 1, 0);
        const kx = (x1 - x0 - dx) / (x - 1);
        const columns = new Array(x).fill(0).map(() => []);
        for (const node of nodes) {
            const i = Math.max(0, Math.min(x - 1, Math.floor(align.call(null, node, x))));
            node.layer = i;
            node.x0 = x0 + i * kx;
            node.x1 = node.x0 + dx;
            if (columns[i])
                columns[i].push(node);
            else
                columns[i] = [node];
        }
        if (sort)
            for (const column of columns) {
                column.sort(sort);
            }
        return columns;
    }
    function initializeNodeBreadths(columns) {
        const ky = min(columns, (c) => (y1 - y0 - (c.length - 1) * py) / sum(c, value));
        for (const nodes of columns) {
            let y = y0;
            for (const node of nodes) {
                node.y0 = y;
                node.y1 = y + node.value * ky;
                y = node.y1 + py;
                for (const link of node.sourceLinks) {
                    link.width = link.value * ky;
                }
            }
            y = (y1 - y + py) / (nodes.length + 1);
            for (let i = 0; i < nodes.length; ++i) {
                const node = nodes[i];
                node.y0 += y * (i + 1);
                node.y1 += y * (i + 1);
            }
            reorderLinks(nodes);
        }
    }
    function computeNodeBreadths(graph) {
        const columns = computeNodeLayers(graph);
        py = Math.min(dy, (y1 - y0) / (max(columns, (c) => c.length) - 1));
        initializeNodeBreadths(columns);
        for (let i = 0; i < iterations; ++i) {
            const alpha = Math.pow(0.99, i);
            const beta = Math.max(1 - alpha, (i + 1) / iterations);
            relaxRightToLeft(columns, alpha, beta);
            relaxLeftToRight(columns, alpha, beta);
        }
    }
    // Reposition each node based on its incoming (target) links.
    function relaxLeftToRight(columns, alpha, beta) {
        for (let i = 1, n = columns.length; i < n; ++i) {
            const column = columns[i];
            for (const target of column) {
                let y = 0;
                let w = 0;
                for (const { source, value } of target.targetLinks) {
                    const v = value * (target.layer - source.layer);
                    y += targetTop(source, target) * v;
                    w += v;
                }
                if (!(w > 0))
                    continue;
                const dy = (y / w - target.y0) * alpha;
                target.y0 += dy;
                target.y1 += dy;
                reorderNodeLinks(target);
            }
            if (sort === undefined)
                column.sort(ascendingBreadth);
            if (column.length)
                resolveCollisions(column, beta);
        }
    }
    // Reposition each node based on its outgoing (source) links.
    function relaxRightToLeft(columns, alpha, beta) {
        for (let n = columns.length, i = n - 2; i >= 0; --i) {
            const column = columns[i];
            for (const source of column) {
                let y = 0;
                let w = 0;
                for (const { target, value } of source.sourceLinks) {
                    const v = value * (target.layer - source.layer);
                    y += sourceTop(source, target) * v;
                    w += v;
                }
                if (!(w > 0))
                    continue;
                const dy = (y / w - source.y0) * alpha;
                source.y0 += dy;
                source.y1 += dy;
                reorderNodeLinks(source);
            }
            if (sort === undefined)
                column.sort(ascendingBreadth);
            if (column.length)
                resolveCollisions(column, beta);
        }
    }
    function resolveCollisions(nodes, alpha) {
        const i = nodes.length >> 1;
        const subject = nodes[i];
        resolveCollisionsBottomToTop(nodes, subject.y0 - py, i - 1, alpha);
        resolveCollisionsTopToBottom(nodes, subject.y1 + py, i + 1, alpha);
        resolveCollisionsBottomToTop(nodes, y1, nodes.length - 1, alpha);
        resolveCollisionsTopToBottom(nodes, y0, 0, alpha);
    }
    // Push any overlapping nodes down.
    function resolveCollisionsTopToBottom(nodes, y, i, alpha) {
        for (; i < nodes.length; ++i) {
            const node = nodes[i];
            const dy = (y - node.y0) * alpha;
            if (dy > 1e-6)
                (node.y0 += dy), (node.y1 += dy);
            y = node.y1 + py;
        }
    }
    // Push any overlapping nodes up.
    function resolveCollisionsBottomToTop(nodes, y, i, alpha) {
        for (; i >= 0; --i) {
            const node = nodes[i];
            const dy = (node.y1 - y) * alpha;
            if (dy > 1e-6)
                (node.y0 -= dy), (node.y1 -= dy);
            y = node.y0 - py;
        }
    }
    function reorderNodeLinks({ sourceLinks, targetLinks }) {
        if (linkSort === undefined) {
            for (const { source: { sourceLinks }, } of targetLinks) {
                sourceLinks.sort(ascendingTargetBreadth);
            }
            for (const { target: { targetLinks }, } of sourceLinks) {
                targetLinks.sort(ascendingSourceBreadth);
            }
        }
    }
    function reorderLinks(nodes) {
        if (linkSort === undefined) {
            for (const { sourceLinks, targetLinks } of nodes) {
                sourceLinks.sort(ascendingTargetBreadth);
                targetLinks.sort(ascendingSourceBreadth);
            }
        }
    }
    // Returns the target.y0 that would produce an ideal link from source to target.
    function targetTop(source, target) {
        let y = source.y0 - ((source.sourceLinks.length - 1) * py) / 2;
        for (const { target: node, width } of source.sourceLinks) {
            if (node === target)
                break;
            y += width + py;
        }
        for (const { source: node, width } of target.targetLinks) {
            if (node === source)
                break;
            y -= width;
        }
        return y;
    }
    // Returns the source.y0 that would produce an ideal link from source to target.
    function sourceTop(source, target) {
        let y = target.y0 - ((target.targetLinks.length - 1) * py) / 2;
        for (const { source: node, width } of target.targetLinks) {
            if (node === source)
                break;
            y += width + py;
        }
        for (const { target: node, width } of source.sourceLinks) {
            if (node === target)
                break;
            y -= width;
        }
        return y;
    }
    return sankey;
}
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