OGDF Hypergraph Library: Basic Examples and Introduction

Certainly! Here's a basic example of how you can use the OGDF library to create and manipulate a hypergraph:

#include <ogdf/basic/Graph.h>
#include <ogdf/basic/Hypergraph.h>

using namespace ogdf;

int main() {
    Hypergraph hypergraph;

    // Create some nodes
    Hypernode node1 = hypergraph.newNode();
    Hypernode node2 = hypergraph.newNode();
    Hypernode node3 = hypergraph.newNode();

    // Create a hyperedge and add nodes to it
    Hyperedge hyperedge = hypergraph.newEdge();
    hypergraph.addSource(hyperedge, node1);
    hypergraph.addTarget(hyperedge, node2);

    // Print the hypergraph
    hypergraph.print(std::cout);

    return 0;
}

In this example, we include the necessary headers for the OGDF library, specifically the 'Graph' and 'Hypergraph' classes. We then create a 'Hypergraph' object called 'hypergraph'.

Next, we create three 'Hypernode' objects using the 'newNode()' function and assign them to 'node1', 'node2', and 'node3'. These nodes represent the nodes of the hypergraph.

We also create a 'Hyperedge' object called 'hyperedge' using the 'newEdge()' function. We then add 'node1' as a source and 'node2' as a target to the hyperedge using the 'addSource()' and 'addTarget()' functions.

Finally, we print the hypergraph using the 'print()' function.

Please note that this is just a basic example to get you started. OGDF provides numerous other functions and algorithms for manipulating hypergraphs, such as computing transitive closures, finding connected components, or performing layout algorithms. You can refer to the OGDF documentation for more advanced usage and explore its capabilities further.