poisson3d_3.h

Dolfin provide a high-performance linear algebra library

// This code conforms with the UFC specification version 1.0
// and was automatically generated by FFC version 0.4.1.
//
// Warning: This code was generated with the option '-l dolfin'
// and contains DOLFIN-specific wrappers that depend on DOLFIN.

#ifndef __POISSON3D_3_H
#define __POISSON3D_3_H

#include <cmath>
#include <stdexcept>
#include <fstream>
#include <ufc.h>

/// This class defines the interface for a finite element.

class UFC_Poisson3D_3BilinearForm_finite_element_0: public ufc::finite_element
{
public:

  /// Constructor
  UFC_Poisson3D_3BilinearForm_finite_element_0() : ufc::finite_element()
  {
    // Do nothing
  }

  /// Destructor
  virtual ~UFC_Poisson3D_3BilinearForm_finite_element_0()
  {
    // Do nothing
  }

  /// Return a string identifying the finite element
  virtual const char* signature() const
  {
    return "Lagrange finite element of degree 3 on a tetrahedron";
  }

  /// Return the cell shape
  virtual ufc::shape cell_shape() const
  {
    return ufc::tetrahedron;
  }

  /// Return the dimension of the finite element function space
  virtual unsigned int space_dimension() const
  {
    return 20;
  }

  /// Return the rank of the value space
  virtual unsigned int value_rank() const
  {
    return 0;
  }

  /// Return the dimension of the value space for axis i
  virtual unsigned int value_dimension(unsigned int i) const
  {
    return 1;
  }

  /// Evaluate basis function i at given point in cell
  virtual void evaluate_basis(unsigned int i,
                              double* values,
                              const double* coordinates,
                              const ufc::cell& c) const
  {
    // Extract vertex coordinates
    const double * const * element_coordinates = c.coordinates;
    
    // Compute Jacobian of affine map from reference cell
    const double J_00 = element_coordinates[1][0] - element_coordinates[0][0];
    const double J_01 = element_coordinates[2][0] - element_coordinates[0][0];
    const double J_02 = element_coordinates[3][0] - element_coordinates[0][0];
    const double J_10 = element_coordinates[1][1] - element_coordinates[0][1];
    const double J_11 = element_coordinates[2][1] - element_coordinates[0][1];
    const double J_12 = element_coordinates[3][1] - element_coordinates[0][1];
    const double J_20 = element_coordinates[1][2] - element_coordinates[0][2];
    const double J_21 = element_coordinates[2][2] - element_coordinates[0][2];
    const double J_22 = element_coordinates[3][2] - element_coordinates[0][2];
      
    // Compute sub determinants
    const double d00 = J_11*J_22 - J_12*J_21;
    const double d01 = J_12*J_20 - J_10*J_22;
    const double d02 = J_10*J_21 - J_11*J_20;
    
    const double d10 = J_02*J_21 - J_01*J_22;
    const double d11 = J_00*J_22 - J_02*J_20;
    const double d12 = J_01*J_20 - J_00*J_21;
    
    const double d20 = J_01*J_12 - J_02*J_11;
    const double d21 = J_02*J_10 - J_00*J_12;
    const double d22 = J_00*J_11 - J_01*J_10;
      
    // Compute determinant of Jacobian
    double detJ = J_00*d00 + J_10*d10 + J_20*d20;
    
    // Compute constants
    const double C0 = element_coordinates[3][0] + element_coordinates[2][0] \
                    + element_coordinates[1][0] - element_coordinates[0][0];
    const double C1 = element_coordinates[3][1] + element_coordinates[2][1] \
                    + element_coordinates[1][1] - element_coordinates[0][1];
    const double C2 = element_coordinates[3][2] + element_coordinates[2][2] \
                    + element_coordinates[1][2] - element_coordinates[0][2];
    
    // Get coordinates and map to the reference (FIAT) element
    double x = coordinates[0];
    double y = coordinates[1];
    double z = coordinates[2];
    
    x = (2.0*d00*x + 2.0*d10*y + 2.0*d20*z - d00*C0 - d10*C1 - d20*C2) / detJ;
    y = (2.0*d01*x + 2.0*d11*y + 2.0*d21*z - d01*C0 - d11*C1 - d21*C2) / detJ;
    z = (2.0*d02*x + 2.0*d12*y + 2.0*d22*z - d02*C0 - d12*C1 - d22*C2) / detJ;
    
    // Map coordinates to the reference cube
    if (std::abs(y + z) < 1e-14)
      x = 1.0;
    else
      x = -2.0 * (1.0 + x)/(y + z) - 1.0;
    if (std::abs(z - 1.0) < 1e-14)
      y = -1.0;
    else
      y = 2.0 * (1.0 + y)/(1.0 - z) - 1.0;
    
    // Reset values
    *values = 0;
    
    // Map degree of freedom to element degree of freedom
    const unsigned int dof = i;
    
    // Generate scalings
    const double scalings_y_0 = 1;
    const double scalings_y_1 = scalings_y_0*(0.5 - 0.5*y);
    const double scalings_y_2 = scalings_y_1*(0.5 - 0.5*y);
    const double scalings_y_3 = scalings_y_2*(0.5 - 0.5*y);
    const double scalings_z_0 = 1;
    const double scalings_z_1 = scalings_z_0*(0.5 - 0.5*z);
    const double scalings_z_2 = scalings_z_1*(0.5 - 0.5*z);