Added pan + zoom to diagram viewer; show_diagram() didn't return; added PyQt, PyOpenGL, NumPy as dependencies in the docs
#include <boost/iterator/indirect_iterator.hpp>
#include <boost/python.hpp>
#include <boost/python/iterator.hpp>
#include <boost/python/return_internal_reference.hpp>
namespace bp = boost::python;
#include "chain.h"
namespace dp = dionysus::python;
template<class Chain>
boost::indirect_iterator<typename Chain::const_iterator> chain_begin(Chain& c) { return boost::make_indirect_iterator(c.begin()); }
template<class Chain>
boost::indirect_iterator<typename Chain::const_iterator> chain_end(Chain& c) { return boost::make_indirect_iterator(c.end()); }
void export_chain()
{
bp::class_<dp::VSPChain>("SPChain")
.def("__iter__", bp::range<bp::return_internal_reference<1> >(&chain_begin<dp::VSPChain>, &chain_end<dp::VSPChain>))
.def("__len__", &dp::VSPChain::size)
;
bp::class_<dp::VDPChain>("DPChain")
.def("__iter__", bp::range<bp::return_internal_reference<1> >(&chain_begin<dp::VDPChain>, &chain_end<dp::VDPChain>))
.def("__len__", &dp::VDPChain::size)
;
}