Re: [Boost-users] Kamada kawai spring layout algorithm

From: Meththa (meththa82_at_[hidden])
Date: 2007-09-27 08:45:19

>>Meththa wrote:
>> I want to use the Kamada Kawai spring layout algorithm and I do not 
>> know what to pass for the final parameter when calling the function. 
>> the template of the function is given below.
>>  
>> *template*<*typename* Graph, *typename* PositionMap, *typename* 
>> WeightMap, *typename* T, *bool* EdgeOrSideLength>
>>   *bool* kamada_kawai_spring_layout(*const* Graph & g, PositionMap 
>> position, WeightMap weight, /unspecified/ edge_or_side_length);
>> I do not understand what value needs to be given and what type for 
>> /unspecified edge_or_side_length./
>> // 
> >Can someone please point me in the right direction with regards to this.

>If you want the side of the bounding box to be of length "s", pass 
>boost::side_length(s)
>If you want the "normal" edge length to be e, pass boost::edge_length(e).
>
>    - Doug

Is the bouding box the placement area? I tried both ways you have suggested above and i can't seem to get rid of the compiler errors. If I leave boost::side_length(s) as it is, the compiler complains 's' is not instantiated. If I give a value instead of 's', it complains as follows.

C:/boost_1_34_1/boost/graph/kamada_kawai_spring_layout.hpp: In function `bool 
   boost::kamada_kawai_spring_layout(const Graph&, PositionMap, WeightMap, 
   boost::detail::graph::edge_or_side<EdgeOrSideLength, T>) [with Graph = 
   Graph, PositionMap = 
   boost::iterator_property_map<__gnu_cxx::__normal_iterator<boost::simple_point<double>*,
   std::vector<boost::simple_point<double>, 
   std::allocator<boost::simple_point<double> > > >, 
   boost::vec_adj_list_vertex_id_map<boost::no_property, size_t>, 
   boost::simple_point<double>, boost::simple_point<double>&>, WeightMap = 
   boost::adj_list_edge_property_map<boost::undirected_tag, 
   boost::detail::error_property_not_found, 
   boost::detail::error_property_not_found&, size_t, boost::no_property, 
   boost::edge_weight_t>, T = int, bool EdgeOrSideLength = false]':
main2.cpp:57:   instantiated from here
C:/boost_1_34_1/boost/graph/kamada_kawai_spring_layout.hpp:535: no matching 
   function for call to `boost::detail::error_property_not_found::
   error_property_not_found(double)'

Can you shed some light on this please.

Thanks - Meththa


       
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