GwyCoordTransform2DFunc ()

void                (*GwyCoordTransform2DFunc)          (gdouble x,
                                                         gdouble y,
                                                         gdouble *px,
                                                         gdouble *py,
                                                         gpointer user_data);

The type of two-dimensional coordinate transform function.

Since 2.5

gwy_data_field_correct_laplace_iteration ()

void                gwy_data_field_correct_laplace_iteration
                                                        (GwyDataField *data_field,
                                                         GwyDataField *mask_field,
                                                         GwyDataField *buffer_field,
                                                         gdouble corrfactor,
                                                         gdouble *error);

Performs one interation of Laplace data correction.

Tries to remove all the points in mask off the data by using iterative method similar to solving heat flux equation.

Use this function repeatedly until reasonable error is reached.

gwy_data_field_correct_average ()

void                gwy_data_field_correct_average      (GwyDataField *data_field,
                                                         GwyDataField *mask_field);

Fills data under mask with average value.

Simply puts average value of all the data_field values into points in data_field lying under points where mask_field values are nonzero.

gwy_data_field_mask_outliers ()

void                gwy_data_field_mask_outliers        (GwyDataField *data_field,
                                                         GwyDataField *mask_field,
                                                         gdouble thresh);

Creates mask of data that are above or below thresh*sigma from average height.

Sigma denotes root-mean square deviation of heights. This criterium corresponds to the usual Gaussian distribution outliers detection if thresh is 3.

gwy_data_field_mask_outliers2 ()

void                gwy_data_field_mask_outliers2       (GwyDataField *data_field,
                                                         GwyDataField *mask_field,
                                                         gdouble thresh_low,
                                                         gdouble thresh_high);

Creates mask of data that are above or below multiples of rms from average height.

Data that are below mean-thresh_low*sigma or above mean+thresh_high*sigma are marked as outliers, where sigma denotes the root-mean square deviation of heights.

Since 2.26

gwy_data_field_distort ()

void                gwy_data_field_distort              (GwyDataField *source,
                                                         GwyDataField *dest,
                                                         GwyCoordTransform2DFunc invtrans,
                                                         gpointer user_data,
                                                         GwyInterpolationType interp,
                                                         GwyExteriorType exterior,
                                                         gdouble fill_value);

Distorts a data field in the horizontal plane.

Note the transform function invtrans is the inverse transform, in other words it calculates the old coordinates from the new coordinates (the transform would not be uniquely defined the other way round).

Since 2.5

gwy_data_field_affine ()

void                gwy_data_field_affine               (GwyDataField *source,
                                                         GwyDataField *dest,
                                                         const gdouble *invtrans,
                                                         GwyInterpolationType interp,
                                                         GwyExteriorType exterior,
                                                         gdouble fill_value);

Performs an affine transformation of a data field in the horizontal plane.

Note the transform invtrans is the inverse transform, in other words it calculates the old coordinates from the new coordinates. This way even degenerate (non-invertible) transforms can be meaningfully used. Also note that the (column, row) coordinate system is left-handed.

Since 2.34

gwy_data_field_unrotate_find_corrections ()

GwyPlaneSymmetry    gwy_data_field_unrotate_find_corrections
                                                        (GwyDataLine *derdist,
                                                         gdouble *correction);

Finds rotation corrections.

Rotation correction is computed for for all symmetry types. In addition an estimate is made about the prevalent one.