NoBoundaryCollapseToInteriorInvariant.cpp

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#include "NoBoundaryCollapseToInteriorInvariant.hpp"
#include <wmtk/Mesh.hpp>
#include <wmtk/simplex/Simplex.hpp>
 
namespace wmtk::invariants {
NoBoundaryCollapseToInteriorInvariant::NoBoundaryCollapseToInteriorInvariant(const Mesh& m)
    : Invariant(m, true, false, false)
{}
 
bool NoBoundaryCollapseToInteriorInvariant::before(const simplex::Simplex& t) const
{
    assert(t.primitive_type() == PrimitiveType::Edge);
    bool v0_on_boundary = mesh().is_boundary(PrimitiveType::Vertex, t.tuple());
    bool v1_on_boundary = mesh().is_boundary(
        PrimitiveType::Vertex,
        mesh().switch_tuple(t.tuple(), PrimitiveType::Vertex));
 
    if (v0_on_boundary && !v1_on_boundary) {
        return false;
    }
    return true;
}
} // namespace wmtk::invariants