private void UpdateLinkBundleRemove(Link link) {
if (link == null) return;
// see if there's an existing LinkBundle for this link
LinkBundle bundle = link.Bundle;
if (bundle != null) {
int oldindex = link.BundleIndex;
link.Bundle = null;
link.BundleIndex = 0;
link.InvalidateRelationships("curviness");
bundle.Links.Remove(link);
// if one or none left, remove the LinkBundle from both nodes
if (bundle.Links.Count < 2) {
// if there's only one link left in the LinkBundle, assume it shouldn't have one at all
if (bundle.Links.Count == 1) {
Link otherlink = bundle.Links[0];
otherlink.Bundle = null;
otherlink.BundleIndex = 0;
otherlink.InvalidateRelationships("curviness");
}
bundle.Node1.RemoveBundle(bundle);
bundle.Node2.RemoveBundle(bundle);
} else { // two or more links left in bundle
// oldindex value no longer used: shift down BundleIndex values > oldindex, ignoring sign,
// if they are on the same side as oldindex (i.e., if even, all even BundleIndexes that are larger than oldindex)
oldindex = Math.Abs(oldindex);
bool even = oldindex%2 == 0;
foreach (Link l in bundle.Links) {
int idx = Math.Abs(l.BundleIndex);
bool e = idx%2 == 0;
if (idx > oldindex && even == e) {
if (l.BundleIndex > 0) {
l.BundleIndex -= 2;
} else {
l.BundleIndex += 2;
}
l.InvalidateRelationships("curviness");
}
}
}
}
}
