go_direction_get_name ()

char const *
go_direction_get_name (GODirection d);

go_direction_is_forward ()

gboolean
go_direction_is_forward (GODirection d);

go_direction_is_horizontal ()

gboolean
go_direction_is_horizontal (GODirection d);

go_geometry_AABR_add ()

void
go_geometry_AABR_add (GOGeometryAABR *aabr0,
                      GOGeometryAABR const *aabr1);

Computes the Axis Aligned Bounding Rectangle of aabr0 and aabr1, and stores result in aabr0.

go_geometry_OBR_to_AABR ()

void
go_geometry_OBR_to_AABR (GOGeometryOBR const *obr,
                         GOGeometryAABR *aabr);

Stores Axis Aligned Bounding Rectangle of obr in aabr .

go_geometry_calc_label_anchor ()

GOGeometrySide
go_geometry_calc_label_anchor (GOGeometryOBR *obr,
                               double alpha);

go_geometry_calc_label_position ()

GOGeometrySide
go_geometry_calc_label_position (GOGeometryOBR *obr,
                                 double alpha,
                                 double offset,
                                 GOGeometrySide side,
                                 GOGeometrySide anchor);

Convenience routine that computes position of a label relative to an axis.

go_geometry_cartesian_to_polar ()

void
go_geometry_cartesian_to_polar (double x,
                                double y,
                                double *rho,
                                double *theta);

Converts cartesion coordinates to polar coordinates.

go_geometry_get_rotation_type ()

GOGeometryRotationType
go_geometry_get_rotation_type (double alpha);

Calculates rotation type for handling of special angles (alpha = n * pi / 2)

go_geometry_point_to_segment ()

double
go_geometry_point_to_segment (double xp,
                              double yp,
                              double xs,
                              double ys,
                              double w,
                              double h);

go_geometry_test_OBR_overlap ()

gboolean
go_geometry_test_OBR_overlap (GOGeometryOBR const *obr0,
                              GOGeometryOBR const *obr1);

Overlap test of Oriented Bounding Rectangles by the separating axis method.

GOGeometryAABR

typedef struct _GogViewAllocation GOGeometryAABR;

GOGeometryOBR

typedef struct {
        double x, y;
        double w, h;
        double alpha;
} GOGeometryOBR;

enum GOGeometryRotationType

enum GOGeometrySide

GO_GEOMETRY_ANGLE_TOLERANCE

#define GO_GEOMETRY_ANGLE_TOLERANCE 1E-3

enum GODirection