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Force Directed Graph Visualization: Do not let nodes overlap

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This really won't scale with lots of nodes
This commit is contained in:
Vishesh Handa
2020-08-03 00:55:44 +02:00
parent c5deb3e988
commit b27f63f829
1 changed files with 25 additions and 3 deletions
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28
lib/main_graph.dart
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@ -159,7 +159,7 @@ class Graph extends ChangeNotifier {
List<Node> nodes = []; List<Node> nodes = [];
List<Edge> edges = []; List<Edge> edges = [];
Map<String, List<int>> _neighbours = {}; Map<String, Set<int>> _neighbours = {};
Map<String, int> _nodeIndexes; Map<String, int> _nodeIndexes;
void notify() { void notify() {
@ -177,7 +177,7 @@ class Graph extends ChangeNotifier {
var _nodes = _neighbours[n.label]; var _nodes = _neighbours[n.label];
if (_nodes != null) { if (_nodes != null) {
return _nodes; return _nodes.union(computeOverlappingNodes(n)).toList();
} }
var nodes = <int>{}; var nodes = <int>{};
@ -193,8 +193,30 @@ class Graph extends ChangeNotifier {
} }
} }
_nodes = nodes.toList();
_neighbours[n.label] = _nodes; _neighbours[n.label] = _nodes;
return nodes.union(computeOverlappingNodes(n)).toList();
}
// These nodes aren't actually neighbours, but we don't want nodes to
// ever overlap, so I'm making the ones that are close by neighbours
Set<int> computeOverlappingNodes(Node n) {
var _nodes = <int>{};
for (var i = 0; i < nodes.length; i++) {
var node = nodes[i];
if (node.label == n.label) {
continue;
}
var dx = node.x - n.x;
var dy = node.y - n.y;
var dist = sqrt((dx * dx) + (dy * dy));
if (dist <= 60) {
// print('${node.label} and ${n.label} are too close - $dist');
_nodes.add(i);
}
}
return _nodes; return _nodes;
} }