/// <summary>
/// Returns an IEnumerable that yields the mappings/connections defined by the mapping function (from the source nodes to
/// the target nodes) as a sequence. The alternative of returning a list would require a very long list in extreme scenarios;
/// this approach minimizes down memory usage.
/// </summary>
public IEnumerable <SubstrateConnection> GenerateConnections(SubstrateNodeSet srcNodeSet, SubstrateNodeSet tgtNodeSet)
{
// Test for scenario where srcNodeSet and tgtNodeSet are the same node set, that is, we are creating
// connections within a nodeset and therefore we need to test (and honour) _allowLocalRecurrentConnections.
if (srcNodeSet == tgtNodeSet)
{
// Mapping between nodes within a single node set.
// Break the inner loop into two. This avoids having to make the local recurrent test connection
// for every node pair - we only test when we actually have the same node as source and target.
IList <SubstrateNode> nodeList = srcNodeSet.NodeList;
int count = nodeList.Count;
for (int i = 0; i < count; i++)
{
// Loop over all nodes prior to the i'th.
SubstrateNode srcNode = nodeList[i];
for (int j = 0; j < i; j++)
{
if (_testNodePair(srcNode, nodeList[j]))
{
yield return(new SubstrateConnection(srcNode, nodeList[j]));
}
}
// Test for local recurrent connection.
if (_allowLocalRecurrentConnections && _testNodePair(srcNode, srcNode))
{
yield return(new SubstrateConnection(srcNode, srcNode));
}
// Loop over all nodes after the i'th.
for (int j = i + 1; j < count; j++)
{
if (_testNodePair(srcNode, nodeList[j]))
{
yield return(new SubstrateConnection(srcNode, nodeList[j]));
}
}
}
}
else
{
// Mapping between nodes in two distinct node sets.
foreach (SubstrateNode srcNode in srcNodeSet.NodeList)
{
foreach (SubstrateNode tgtNode in tgtNodeSet.NodeList)
{
if (_testNodePair(srcNode, tgtNode))
{
yield return(new SubstrateConnection(srcNode, tgtNode));
}
}
}
}
}
private bool TestNodePair_MaxDistance(SubstrateNode srcNode, SubstrateNode tgtNode)
{
return(CalcDistanceSquared(srcNode._position, tgtNode._position) < _maximumConnectionDistanceSquared);
}
private bool TestNodePair_MaxDistance(SubstrateNode srcNode,SubstrateNode tgtNode)
{
return CalcDistanceSquared(srcNode._position, tgtNode._position) < _maximumConnectionDistanceSquared;
}
private bool TestNodePair_NullTest(SubstrateNode srcNode, SubstrateNode tgtNode)
{
return(true);
}
private bool TestNodePair_NullTest(SubstrateNode srcNode,SubstrateNode tgtNode)
{
return true;
}