gnome-print-unit

Details

>struct GnomePrintUnit

struct GnomePrintUnit {

	guint version : 8; /* Has to be 0 at moment */
	guint base : 8; /* Base */
	gdouble unittobase;
	/* I am not absolutely sure, but seems that gettext can do the magic */
	guchar *name;
	guchar *abbr;
	guchar *plural;
	guchar *abbr_plural;
};

>enum GnomePrintUnitBase

typedef enum {
	GNOME_PRINT_UNIT_DIMENSIONLESS = (1 << 0), /* For percentages and like */
	GNOME_PRINT_UNIT_ABSOLUTE = (1 << 1),      /* Real world distances - i.e. mm, cm... */
	GNOME_PRINT_UNIT_DEVICE = (1 << 2),        /* Semi-real device-dependent distances i.e. pixels */
	GNOME_PRINT_UNIT_USERSPACE = (1 << 3)      /* Mathematical coordinates */
} GnomePrintUnitBase;

>GNOME_PRINT_PS_UNIT

#define GNOME_PRINT_PS_UNIT   (gnome_print_unit_get_identity (GNOME_PRINT_UNIT_ABSOLUTE))

The GnomePrintUnit structure that represents the absolute units.

>GNOME_PRINT_UNITS_ALL

#define GNOME_PRINT_UNITS_ALL (GNOME_PRINT_UNIT_DIMENSIONLESS | GNOME_PRINT_UNIT_ABSOLUTE | GNOME_PRINT_UNIT_DEVICE | GNOME_PRINT_UNIT_USERSPACE)

Convenience macro for all of the different GNOME_PRINT_UNIT_* macros.

>gnome_print_unit_get_identity ()

const GnomePrintUnit* gnome_print_unit_get_identity
                                            (guint base);

Retrieves the GnomePrintUnit structure referenced by base base.

`base` :	The base of the GnomePrintUnit to retrieve
Returns :	The GnomePrintUnit structure representing `base`. `NULL` on error

>gnome_print_unit_get_default ()

const GnomePrintUnit* gnome_print_unit_get_default
                                            (void);

Used to get the default GnomePrintUnit structure.

Returns :

A pointer to the default GnomePrintUnit structure

>gnome_print_unit_get_by_name ()

const GnomePrintUnit* gnome_print_unit_get_by_name
                                            (const guchar *name);

Get a unit based on its name, for example "Millimeter" or "Inches".

`name` :	Name of the unit, as a string pointer
Returns :	A constant pointer to a GnomePrintUnit, `NULL` on error

>gnome_print_unit_get_by_abbreviation ()

const GnomePrintUnit* gnome_print_unit_get_by_abbreviation
                                            (const guchar *abbreviation);

Get a unit based on its abbreviation, for example "cm" "pts" or "in".

`abbreviation` :	Abbreviation of the unit, as a string pointer
Returns :	A constant pointer to a GnomePrintUnit, `NULL` on error

>gnome_print_unit_get_list ()

GList*      gnome_print_unit_get_list       (guint bases);

Gets a list of the units represented by the bases bases. To get a list of all units then use GNOME_PRINT_UNITS_ALL. The list that is returned should be freed using gnome_print_unit_free_list.

`bases` :	The bases to include in the list
Returns :	A pointer to a GList, `NULL` on error

>gnome_print_unit_free_list ()

void        gnome_print_unit_free_list      (GList *units);

Used to free the list of units created by gnome_print_unit_get_list.

units :

A pointer to a GList to be freed

>gnome_print_convert_distance ()

gboolean    gnome_print_convert_distance    (gdouble *distance,
                                             const GnomePrintUnit *from,
                                             const GnomePrintUnit *to);

Check whether a conversion between from and to can be made

`distance` :	The distance to convert, and the converted value on success
`from` :	Units to convert from
`to` :	Units to convert to
Returns :	`TRUE` if the conversion is possible, `FALSE` if it is not or on error

>gnome_print_convert_distance_full ()

gboolean    gnome_print_convert_distance_full
                                            (gdouble *distance,
                                             const GnomePrintUnit *from,
                                             const GnomePrintUnit *to,
                                             gdouble ctmscale,
                                             gdouble devicescale);

Convert a distance from one unit to another. You should supply a scale as necessary.

ctmscale is userspace->absolute, devicescale is device->absolute

`distance` :	The distance to convert, and the result on success
`from` :	Units to convert from
`to` :	Units to convert to
`ctmscale` :	The userspace scale to use
`devicescale` :	The device scale to use
Returns :	`TRUE` if the conversion is possible, `FALSE` if it is not or on error