QuadRule4.cpp

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#include "QuadRule4.h"
 
#include "MathLib/GeometricBasics.h"
#include "MeshLib/Node.h"
 
namespace MeshLib
{
const unsigned QuadRule4::edge_nodes[4][2] = {
    {0, 1},  // Edge 0
    {1, 2},  // Edge 1
    {2, 3},  // Edge 2
    {3, 0}   // Edge 3
};
 
double QuadRule4::computeVolume(Node const* const* _nodes)
{
    return MathLib::calcTriangleArea(*_nodes[0], *_nodes[1], *_nodes[2]) +
           MathLib::calcTriangleArea(*_nodes[2], *_nodes[3], *_nodes[0]);
}
 
bool QuadRule4::isPntInElement(Node const* const* nodes,
                               MathLib::Point3d const& pnt,
                               double eps)
{
    return (
        MathLib::isPointInTriangle(pnt, *nodes[0], *nodes[1], *nodes[2], eps) ||
        MathLib::isPointInTriangle(pnt, *nodes[0], *nodes[2], *nodes[3], eps));
}
 
unsigned QuadRule4::identifyFace(Node const* const* _nodes,
                                 Node const* nodes[3])
{
    for (unsigned i = 0; i < 4; i++)
    {
        unsigned flag(0);
        for (unsigned j = 0; j < 2; j++)
        {
            for (unsigned k = 0; k < 2; k++)
            {
                if (_nodes[edge_nodes[i][j]] == nodes[k])
                {
                    flag++;
                }
            }
        }
        if (flag == 2)
        {
            return i;
        }
    }
    return std::numeric_limits<unsigned>::max();
}
 
ElementErrorCode QuadRule4::validate(const Element* e)
{
    ElementErrorCode error_code;
    error_code[ElementErrorFlag::ZeroVolume] = hasZeroVolume(*e);
    Node const* const* _nodes = e->getNodes();
    error_code[ElementErrorFlag::NonCoplanar] =
        (!MathLib::isCoplanar(*_nodes[0], *_nodes[1], *_nodes[2], *_nodes[3]));
    // for collapsed quads (i.e. reduced to a line) this test might result
    // "false" as all four points are actually located on a line.
    if (!error_code[ElementErrorFlag::ZeroVolume])
    {
        error_code[ElementErrorFlag::NonConvex] =
            (!(MathLib::dividedByPlane(
                   *_nodes[0], *_nodes[2], *_nodes[1], *_nodes[3]) &&
               MathLib::dividedByPlane(
                   *_nodes[1], *_nodes[3], *_nodes[0], *_nodes[2])));
    }
    error_code[ElementErrorFlag::NodeOrder] = !e->testElementNodeOrder();
    return error_code;
}
 
}  // end namespace MeshLib