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[pratihast22089 <>]

Thank you Andreas.




Andreas Fabri wrote:
> 
> 
> Hello,
> 
> what you observe is not CGAL specific. You would also have it with
> 
> #include <iostream>
> int main()
> {
>    double x;
>    std:cin >> x;
>    std::cout << x << std::endl;
>    return 0;
> }
> 
> You have to increase the precison.
> http://www.cplusplus.com/reference/iostream/ios_base/precision/
> 
> #include <iostream>
> int main()
> {
>    double x;
>    std:cin >> x;
>    std::cout.precision(20);
>    std::cout << x << std::endl;
>    return 0;
> }
> 
> best regards,
> 
> andreas
> 
> 
> pratihast22089 wrote:
>> 
>> 
>> Sebastien Loriot wrote:
>>> pratihast22089 wrote:
>>>> hi,
>>>>
>>>> I am facing one simple problem regarding file stream. 
>>>> I have the data file  like this:
>>>>
>>>> 257507.75  471326.93  44.51
>>>>  257507.77  471326.90  44.49
>>>>  257507.89  471326.93  44.04
>>>>  257507.81  471326.81  44.51
>>>>  257507.89  471326.87  44.10
>>>>
>>>>
>>>> While Reading and writing file stream, it  truncate the number behind
>>>> point 
>>>> of first two columns but not for the third column.
>>>>
>>>> output:
>>>>
>>>>  257507  471326  44.51
>>>>  257507  471326  44.49
>>>>  257507  471326  44.04
>>>>  257507  471326  44.51
>>>>  257507  471326  44.10
>>>>
>>>>
>>>> I had included the #include <CGAL/double.h> header file.
>>>>
>>>> Could you please help me in this regrads.
>>>> Thank you in advance.
>>>>
>>>> Regards,
>>>> Arun K Pratihast
>>>>
>>>>
>>>>
>>>>   
>>> Hello,
>>>
>>> Could you please post a minimal example so that we can reproduce the 
>>> problem encountered.
>>>
>>>
>>> S.
>>>
>>> -- 
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>>>
>>>
>>>
>> 
>> hi,
>> Here is my code:
>> #include "stdafx.h"
>> 
>> #include <cassert>
>> #include <vector>
>> #include <fstream>
>> 
>> #include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
>> 
>> #include <CGAL/Weighted_alpha_shape_euclidean_traits_3.h>
>> #include <CGAL/Regular_triangulation_3.h>
>> #include <CGAL/Alpha_shape_3.h>
>> #include <CGAL/double.h>
>> 
>> #include <list>
>> #include <cassert>
>> #include <vector>
>> #include <fstream>
>> #include <utility> 
>> 
>> typedef CGAL::Exact_predicates_inexact_constructions_kernel K;
>> 
>> typedef CGAL::Weighted_alpha_shape_euclidean_traits_3<K> Gt;
>> 
>> typedef CGAL::Alpha_shape_vertex_base_3<Gt>         Vb;
>> typedef CGAL::Alpha_shape_cell_base_3<Gt>           Fb;
>> typedef CGAL::Triangulation_data_structure_3<Vb,Fb> Tds;
>> typedef CGAL::Regular_triangulation_3<Gt,Tds>       Triangulation_3;
>> typedef CGAL::Alpha_shape_3<Triangulation_3>        Alpha_shape_3;
>> 
>> typedef Alpha_shape_3::Alpha_iterator         Alpha_iterator;
>> typedef Alpha_shape_3::Cell_handle          Cell_handle;
>> typedef Alpha_shape_3::Vertex_handle        Vertex_handle;
>> typedef Alpha_shape_3::Facet                Facet;
>> typedef Alpha_shape_3::Edge                 Edge;
>> typedef Gt::Weighted_point                  Weighted_point;
>> typedef Gt::Bare_point                      Bare_point;
>> typedef K::Point_3                          Point;
>> typedef std::list<Vertex_handle>::const_iterator Vl_it;
>> 
>> 
>> int main()
>> {
>>   std::list<Weighted_point> lwp;
>>  
>>     //read input
>>   std::ifstream is("D:/Cgalcode/Polyhedronification/Debug/demo.xyz");
>>   int n;
>>   is >> n;
>>   std::cout << "Point Reading Start:" << n << " points " << std::endl;
>>  
>>   Bare_point p;
>>   for( ; n>0 ; n--)    {
>>     is >> p;
>>      std::cout<< p<<std::endl;
>>     lwp.push_back(p);
>>   }
>>   std::cout << "Point Reading End:" << std::endl;
>> 
>>              Alpha_shape_3  as(lwp.begin(), lwp.end(), 0.5, 
>> Alpha_shape_3::GENERAL);
>>              //Alpha_shape_3 as(lwp.begin(), lwp.end(), 
>> Alpha_shape_3::GENERAL);;
>>              Alpha_iterator aa = as.alpha_upper_bound(1);
>>              as.set_alpha(*aa);
>> 
>> 
>>   //build alpha_shape  in GENERAL mode and set alpha=0.15
>>   //Alpha_shape_3  as(lwp.begin(), lwp.end(), 0.015,
>> Alpha_shape_3::GENERAL);
>> 
>>   //explore the 0.15-shape - It is dual to the boundary of the union.
>>   std::list<Cell_handle> cells;
>>   std::list<Facet>       facets;
>>   std::list<Edge>        edges;
>>   
>>  
>> as.get_alpha_shape_cells(std::back_inserter(cells),Alpha_shape_3::INTERIOR);
>>   as.get_alpha_shape_facets(std::back_inserter(facets),
>> Alpha_shape_3::REGULAR);
>>   as.get_alpha_shape_facets(std::back_inserter(facets),
>> Alpha_shape_3::SINGULAR);
>>   as.get_alpha_shape_edges(std::back_inserter(edges), 
>> Alpha_shape_3::SINGULAR);
>>   std::cout << " The 0.15-shape has : " << std::endl;
>>   std::cout << cells.size() << " interior tetrahedra" << std::endl;
>>   std::cout << facets.size() << " boundary facets" << std::endl;
>>   std::cout << edges.size()  << " singular edges" << std::endl;
>>  
>> 
>> std::list<Vertex_handle> al_vs;
>> as.get_alpha_shape_vertices(back_inserter(al_vs),Alpha_shape_3::REGULAR);
>> //as.get_alpha_shape_vertices(back_inserter(al_vs),Alpha_shape_3::SINGULAR);
>> std::cout << al_vs.size() << " Vertex Size" << std::endl;
>> 
>> 
>> //Appending my code
>> std::cout << " My alpha point " << std::endl;
>> std::ofstream of;
>> of.open("D:/Cgalcode/Polyhedronification/data/arun/out_test1.xyz" );
>> 
>> for(Vl_it it=al_vs.begin();it!=al_vs.end(); it++) {
>>      
>>      std::cout <<(*it)->point()<< std::endl;
>>      of<<(*it)->point()<<"\n";
>>    
>> }
>> 
>> 
>>   return 0;
>> }
>> 
>> 
> 
> 
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> 
> 
> 

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