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diff --git a/src/3rdparty/adaptagrams/libcola/connected_components.h b/src/3rdparty/adaptagrams/libcola/connected_components.h
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+/*
+ * vim: ts=4 sw=4 et tw=0 wm=0
+ *
+ * libcola - A library providing force-directed network layout using the 
+ *           stress-majorization method subject to separation constraints.
+ *
+ * Copyright (C) 2006-2008  Monash University
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ * See the file LICENSE.LGPL distributed with the library.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ *
+*/
+
+#ifndef CONNECTED_COMPONENTS_H
+#define CONNECTED_COMPONENTS_H
+#include "libcola/cola.h"
+#include <vector>
+
+namespace cola {
+// a graph component with a list of node_ids giving indices for some larger list of nodes
+// for the nodes in this component, 
+// and a list of edges - node indices relative to this component
+class Component {
+public:
+    std::vector<unsigned> node_ids;
+    std::vector<vpsc::Rectangle*> rects;
+    std::vector<cola::Edge> edges;
+    //CompoundConstraints cx, cy;
+    ~Component();
+    void moveRectangles(double x, double y);
+    vpsc::Rectangle* getBoundingBox();
+};
+// for a graph of n nodes, return connected components
+void connectedComponents(
+    const std::vector<vpsc::Rectangle*> &rs,
+    const std::vector<cola::Edge> &es,
+    //const CompoundConstraints &cx,
+    //const CompoundConstraints &cy, 
+    std::vector<Component*> &components);
+
+// move the contents of each component so that the components do not
+// overlap.
+void separateComponents(const std::vector<Component*> &components);
+
+} // namespace cola
+
+#endif // CONNECTED_COMPONENTS_H