Template Class Grid2D

• Defined in File Grid.h

Class Documentation

template <typename T>
class Grid2D

Template class for fields on a periodic grid with trilinear interpolation.

The grid spacing is constant and equal along all three axes. Values are calculated by trilinear interpolation of the surrounding 8 grid points. The grid is periodically (default) or reflectively extended. The grid sample positions are at 1/2 * size/N, 3/2 * size/N … (2N-1)/2 * size/N.

Public Functions

Grid2D(Vector3d origin, size_t N, double spacing)

Constructor for cubic grid

Parameters

• origin: Position of the lower left front corner of the volume
• N: Number of grid points in one direction
• spacing: Spacing between grid points

Grid2D(Vector3d origin, size_t Nx, size_t Ny, double spacing)

Constructor for non-cubic grid

Parameters

• origin: Position of the lower left front corner of the volume
• Nx: Number of grid points in x-direction
• Ny: Number of grid points in y-direction
• spacing: Spacing between grid points

Grid2D(Vector3d origin, size_t Nx, size_t Ny, Vector3d spacing)

Constructor for non-cubic grid with spacing vector

Parameters

• origin: Position of the lower left front corner of the volume
• Nx: Number of grid points in x-direction
• Ny: Number of grid points in y-direction
• spacing: Spacing vector between grid points

void setOrigin(Vector3d origin)

void setGridSize(size_t Nx, size_t Ny)

Resize grid, also enlarges the volume as the spacing stays constant

size_t getGridSize() const

void setSpacing(Vector3d spacing)

Vector3d getSpacing() const

void setReflective(bool b)

void setVector(const std::vector<float> &v)

void addVector(std::unique_ptr<std::vector<T>> v2)

void pushValue(T value)

Vector3d getOrigin() const

size_t getNx() const

size_t getNy() const

bool isReflective() const

T &get(size_t ix, size_t iy)

Inspector & Mutator

const T &get(size_t ix, size_t iy) const

Inspector

T getValue(size_t ix, size_t iy)

void setValue(size_t ix, size_t iy, T value)

void addValue(size_t ix, size_t iy, T value)

std::vector<T> &getGrid()

Return a reference to the grid values

Vector3d positionFromIndex(int index) const

Position of the grid point of a given index

T closestValue(const Vector3d &position) const

Value of a grid point that is closest to a given position

T interpolate(const Vector3d &position) const

Interpolate the grid at a given position