gwy_xy_new()

GwyXY *
gwy_xy_new (gdouble x,
            gdouble y);

Creates Cartesian coordinates in plane.

This is mostly useful for language bindings.

gwy_xy_copy()

GwyXY *
gwy_xy_copy (const GwyXY *xy);

Copies Cartesian coordinates in plane.

gwy_xy_free()

void
gwy_xy_free (GwyXY *xy);

Frees Cartesian coordinates in plane created with gwy_xy_copy().

gwy_xy_len()

gdouble
gwy_xy_len (const GwyXY *xy);

Computes the length of a plane vector.

gwy_xy_len2()

gdouble
gwy_xy_len2 (const GwyXY *xy);

Computes the squared length of a plane vector.

gwy_xy_dotprod()

gdouble
gwy_xy_dotprod (const GwyXY *xy,
                const GwyXY *other);

Computes the inner product of two plane vectors.

gwy_xy_crossprodz()

gdouble
gwy_xy_crossprodz (const GwyXY *xy,
                   const GwyXY *other);

Computes the Z-component of a cross-product of two vectors given as plane vectors.

The vectors are interpreted the X and Y components of two space vectors which have zero Z-components. Their cross-product then has only one nonzero component: Z. This is what the function calculates.