LineRule.cpp

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// SPDX-FileCopyrightText: Copyright (c) OpenGeoSys Community (opengeosys.org)
// SPDX-License-Identifier: BSD-3-Clause
 
#include "LineRule.h"
 
#include "MathLib/MathTools.h"
#include "MeshLib/Node.h"
 
namespace MeshLib
{
double LineRule::computeVolume(Node const* const* element_nodes)
{
    return std::sqrt(MathLib::sqrDist(*element_nodes[0], *element_nodes[1]));
}
 
bool LineRule::isPntInElement(Node const* const* nodes,
                              MathLib::Point3d const& pnt, double eps)
{
    auto const& a = *nodes[0];
    auto const& b = *nodes[1];
 
    if (MathLib::sqrDist(a, pnt) < eps * eps)
    {
        return true;
    }
    if (MathLib::sqrDist(b, pnt) < eps * eps)
    {
        return true;
    }
 
    double lambda;
    double distance_of_proj_pnt_to_a;
    auto const distance_from_line = MathLib::calcProjPntToLineAndDists(
        pnt, a, b, lambda, distance_of_proj_pnt_to_a);
 
    if (lambda >= 0 && lambda <= 1)
    {
        // pnt has been projected to the interior of the line
        return distance_from_line < eps;
    }
    else
    {
        // pnt has been projected outside the line segment
        // corner cases have already been treated in the beginning
        return false;
    }
}
 
unsigned LineRule::identifyFace(Node const* const* element_nodes,
                                Node const* nodes[1])
{
    if (nodes[0] == element_nodes[0])
    {
        return 0;
    }
    if (nodes[0] == element_nodes[1])
    {
        return 1;
    }
    return std::numeric_limits<unsigned>::max();
}
 
ElementErrorCode LineRule::validate(const Element* e)
{
    ElementErrorCode error_code;
    error_code[ElementErrorFlag::ZeroVolume] = hasZeroVolume(*e);
    return error_code;
}
}  // end namespace MeshLib