| Chapter 4. Working with the Graph Structure | ||
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This page is from the outdated yFiles for Java 2.13 documentation. You can find the most up-to-date documentation for all yFiles products on the yFiles documentation overview page.
Please see the following links for more information about the yFiles product family of diagramming programming libraries and corresponding yFiles products for modern web apps, for cross-platform Java(FX) applications, and for applications for the Microsoft .NET environment.
Table of Contents
This chapter presents first steps to using the yFiles graph structure and outlines general programming aspects. It explains technical consequences of some of the concepts in more detail. Also, it introduces well-known graph analyzing algorithms indispensable to the serious graph worker.
Class Graph
offers three constructors, one to create an empty graph, i.e., one
where node and edge set are empty, the other two to create new instances which
are either partial or complete copies of an already existing graph.
// Create a new, empty graph. Graph graph = new Graph(); // Create a complete copy of 'graph'. Graph graphCopy = new Graph(graph);
It is also possible to ask an instance of type Graph to create a complete copy of itself or to create a new empty graph instance.
When populating an existing graph with graph elements, it is important to observe certain preconditions:
// 'graph' is of type y.base.Graph. // Create 10 nodes. Node n[] = new Node[10]; for (int i = 0; i < 10; i++) n[i] = graph.createNode(); // Create 5 edges. Each edge has "even" source node and "odd" target node. Edge e[] = new Edge[5]; for (int i = 0, j = 0; i < 10; i += 2, j++) e[j] = graph.createEdge(n[i], n[i + 1]);
For further code examples see also GraphDemo.java and RandomGraphGenerator.java from the tutorial demo applications.
Note that the Java code snippets presented in the course of this document serve as examples to demonstrate how to use the functionality yFiles provides. Although they are all correct, they are not complete and will most likely not compile when copied directly.
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