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Add cg::edge_mesh(dcel) and cg::triangle_mesh(dcel)

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Nikita Lisitsa 2022-09-16 19:39:42 +03:00
parent b7e070a3a6
commit 0fe4477097
1 changed files with 54 additions and 0 deletions
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54
libs/cg/include/psemek/cg/dcel.hpp
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@ -2,6 +2,7 @@
#include <psemek/util/empty.hpp> #include <psemek/util/empty.hpp>
#include <psemek/util/ebo.hpp> #include <psemek/util/ebo.hpp>
#include <psemek/geom/simplex.hpp>
#include <cstddef> #include <cstddef>
#include <vector> #include <vector>
@ -599,4 +600,57 @@ namespace psemek::cg
return result; return result;
} }
template <typename Point, typename Edge, typename Face, typename Index, typename OutputIterator>
OutputIterator edge_mesh(dcel<Point, Edge, Face, Index> const & dcel, OutputIterator out)
{
std::vector<bool> visited(dcel.edges.size(), false);
for (Index e = 0; e < dcel.edges.size(); ++e)
{
if (visited[e]) continue;
auto twin = dcel.edges[e].twin;
visited[e] = true;
visited[twin] = true;
auto h = dcel.edge(e);
*out++ = geom::segment<Index>{h.origin().index(), h.twin().origin().index()};
}
return out;
}
template <typename Point, typename Edge, typename Face, typename Index>
auto edge_mesh(dcel<Point, Edge, Face, Index> const & dcel)
{
std::vector<geom::segment<Index>> result;
edge_mesh(dcel, std::back_inserter(result));
return result;
}
template <typename Point, typename Edge, typename Face, typename Index, typename OutputIterator>
OutputIterator triangle_mesh(dcel<Point, Edge, Face, Index> const & dcel, OutputIterator out)
{
for (Index f = 1; f < dcel.faces.size(); ++f)
{
auto h = dcel.face(f).edge();
geom::triangle<Index> t;
t[0] = h.origin().index(); h = h.next();
t[1] = h.origin().index(); h = h.next();
t[2] = h.origin().index();
*out++ = t;
}
return out;
}
template <typename Point, typename Edge, typename Face, typename Index>
auto triangle_mesh(dcel<Point, Edge, Face, Index> const & dcel)
{
std::vector<geom::triangle<Index>> result;
triangle_mesh(dcel, std::back_inserter(result));
return result;
}
} }