feat(ui): add type filter toggles

node_modules/dagre/lib/order/index.js

@@ -0,0 +1,79 @@
+"use strict";
+
+var _ = require("../lodash");
+var initOrder = require("./init-order");
+var crossCount = require("./cross-count");
+var sortSubgraph = require("./sort-subgraph");
+var buildLayerGraph = require("./build-layer-graph");
+var addSubgraphConstraints = require("./add-subgraph-constraints");
+var Graph = require("../graphlib").Graph;
+var util = require("../util");
+
+module.exports = order;
+
+/*
+ * Applies heuristics to minimize edge crossings in the graph and sets the best
+ * order solution as an order attribute on each node.
+ *
+ * Pre-conditions:
+ *
+ *    1. Graph must be DAG
+ *    2. Graph nodes must be objects with a "rank" attribute
+ *    3. Graph edges must have the "weight" attribute
+ *
+ * Post-conditions:
+ *
+ *    1. Graph nodes will have an "order" attribute based on the results of the
+ *       algorithm.
+ */
+function order(g) {
+  var maxRank = util.maxRank(g),
+    downLayerGraphs = buildLayerGraphs(g, _.range(1, maxRank + 1), "inEdges"),
+    upLayerGraphs = buildLayerGraphs(g, _.range(maxRank - 1, -1, -1), "outEdges");
+
+  var layering = initOrder(g);
+  assignOrder(g, layering);
+
+  var bestCC = Number.POSITIVE_INFINITY,
+    best;
+
+  for (var i = 0, lastBest = 0; lastBest < 4; ++i, ++lastBest) {
+    sweepLayerGraphs(i % 2 ? downLayerGraphs : upLayerGraphs, i % 4 >= 2);
+
+    layering = util.buildLayerMatrix(g);
+    var cc = crossCount(g, layering);
+    if (cc < bestCC) {
+      lastBest = 0;
+      best = _.cloneDeep(layering);
+      bestCC = cc;
+    }
+  }
+
+  assignOrder(g, best);
+}
+
+function buildLayerGraphs(g, ranks, relationship) {
+  return _.map(ranks, function(rank) {
+    return buildLayerGraph(g, rank, relationship);
+  });
+}
+
+function sweepLayerGraphs(layerGraphs, biasRight) {
+  var cg = new Graph();
+  _.forEach(layerGraphs, function(lg) {
+    var root = lg.graph().root;
+    var sorted = sortSubgraph(lg, root, cg, biasRight);
+    _.forEach(sorted.vs, function(v, i) {
+      lg.node(v).order = i;
+    });
+    addSubgraphConstraints(lg, cg, sorted.vs);
+  });
+}
+
+function assignOrder(g, layering) {
+  _.forEach(layering, function(layer) {
+    _.forEach(layer, function(v, i) {
+      g.node(v).order = i;
+    });
+  });
+}