mesh_requirements.h

/*****************************************************************************
 * VCLib                                                                     *
 * Visual Computing Library                                                  *
 *                                                                           *
 * Copyright(C) 2021-2025                                                    *
 * Visual Computing Lab                                                      *
 * ISTI - Italian National Research Council                                  *
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 * it under the terms of the Mozilla Public License Version 2.0 as published *
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 * This program is distributed in the hope that it will be useful,           *
 * but WITHOUT ANY WARRANTY; without even the implied warranty of            *
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the              *
 * Mozilla Public License Version 2.0                                        *
 * (https://www.mozilla.org/en-US/MPL/2.0/) for more details.                *
 ****************************************************************************/
 
#ifndef VCL_MESH_REQUIREMENTS_MESH_REQUIREMENTS_H
#define VCL_MESH_REQUIREMENTS_MESH_REQUIREMENTS_H
 
#include <vclib/concepts/mesh.h>
#include <vclib/exceptions/mesh.h>
 
namespace vcl {
 
/********************
 * is/has functions *
 ********************/
 
template<MeshConcept MeshType>
bool isTriangleMesh(const MeshType& m)
{
    if constexpr (HasTriangles<MeshType>) {
        return true;
    }
    else if constexpr (HasFaces<MeshType>) {
        using F = MeshType::FaceType;
        for (const F& f : m.faces()) {
            if (f.vertexNumber() != 3)
                return false;
        }
        return true;
    }
    else {
        return false;
    }
}
 
template<MeshConcept MeshType>
bool isQuadMesh(const MeshType& m)
{
    if constexpr (HasQuads<MeshType>) {
        return true;
    }
    else if constexpr (HasFaces<MeshType>) {
        using F = MeshType::FaceType;
        for (const F& f : m.faces()) {
            if (f.vertexNumber() != 4)
                return false;
        }
        return true;
    }
    else {
        return false;
    }
}
 
template<MeshConcept MeshType>
bool isCompact(const MeshType& m)
{
    return m.isCompact();
}
 
/*********************
 * require functions *
 *********************/
 
template<FaceMeshConcept MeshType>
void requireTriangleMesh(const MeshType& m)
{
    if constexpr (!HasTriangles<MeshType>) {
        for (const auto& f : m.faces()) {
            if (f.vertexNumber() != 3) {
                throw MissingTriangularRequirementException(
                    "Triangle Mesh Required.");
            }
        }
    }
}
 
template<FaceMeshConcept MeshType>
void requireQuadMesh(const MeshType& m)
{
    if constexpr (!HasQuads<MeshType>) {
        for (const auto& f : m.faces()) {
            if (f.vertexNumber() != 4) {
                throw MissingQuadRequirementException("Quad Mesh Required.");
            }
        }
    }
}
 
template<MeshConcept MeshType>
void requireCompactness(const MeshType& m)
{
    if (!m.isCompact())
        throw MissingCompactnessException("Mesh is not compact.");
}
 
} // namespace vcl
 
#endif // VCL_MESH_REQUIREMENTS_MESH_REQUIREMENTS_H