private void writeVertices() throws IOException {
/*
* Start indexing with 1 since 0 is returned if no mapping is found.
*/
vertexIdx = 1;
for (Vertex v : graph.getVertices()) {
vertexTmpIds.put(v, vertexIdx);
writeStartTag(GraphML.NODE_TAG, getVertexAttributes(v), true);
vertexIdx++;
}
}
/**
* Creates a colorizer which color spectrum is scaled to the degree distribution of
* <tt>graph</tt>.
*
* @param graph a graph
*/
public VertexDegreeColorizer(Graph graph) {
Degree degree = Degree.getInstance();
DescriptiveStatistics distr = degree.statistics(graph.getVertices());
k_min = (int) distr.getMin();
k_max = (int) distr.getMax();
}