GwySIValueFormat

GwySIValueFormat — Physical quantitiy formatting

Functions

Types and Values

Includes

#include <libgwyddion/gwyddion.h>

Description

GwySIValueFormat object represents instructions how to format numbers representing physical quantities, including precision and units. They are usually created based on a GwySIUnit and some data ranges with functions such as gwy_si_unit_get_format_with_resolution() or gwy_si_unit_get_format_with_digits(). Various data objects also offer method for obtaining value formats representing reasonably their coordinates or values, for instance gwy_data_field_get_value_format_xy().

Functions

gwy_si_unit_value_format_new()

GwySIValueFormat *
gwy_si_unit_value_format_new (gdouble magnitude,
                              gint precision,
                              const gchar *units);

Constructs a new value format directly.

Usually you construct value formats from a GwySIUnit using functions such as gwy_si_unit_get_format_with_digits() or obtain it from data object functions.

Parameters

magnitude

Number to divide a quantity by (a power of 1000).

 

precision

Number of decimal places to format a quantity to.

 

units

Units to put after quantity divided by magnitude .

 

Returns

Newly allocated value format.


gwy_si_unit_value_format_copy()

GwySIValueFormat *
gwy_si_unit_value_format_copy (GwySIValueFormat *format);

Copies a value format structure.

Parameters

format

A value format to copy.

 

Returns

Newly allocated value format, identical to format .


gwy_si_unit_value_format_free()

void
gwy_si_unit_value_format_free (GwySIValueFormat *format);

Frees a value format structure.

Parameters

format

A value format to free.

 

gwy_si_unit_value_format_assign()

void
gwy_si_unit_value_format_assign (GwySIValueFormat *format,
                                 GwySIValueFormat *source);

Assigns a value format from another.

Parameters

format

Destination value format.

 

source

Source value format.

 

gwy_si_unit_value_format_set_units()

void
gwy_si_unit_value_format_set_units (GwySIValueFormat *format,
                                    const gchar *units);

Sets the units field of a value format structure.

This function keeps the units and units_gstring fields consistent.

Parameters

format

A value format to set units of.

 

units

The units string.

 

Types and Values

GwySIValueFormat

typedef struct {
    gdouble magnitude;
    gint precision;
    gchar *units;
} GwySIValueFormat;

A physical quantity formatting information.

The magnitude and precision fields can be directly modified if necessary. Units must be always set with gwy_si_unit_value_format_set_units() to update the internal representation correctly.

Members

gdouble magnitude;

Number to divide a quantity by (a power of 1000).

 

gint precision;

Number of decimal places to format a quantity to.

 

gchar *units;

Units to put after quantity divided by magnitude . This field must be considered read-only as it is actually an alias to units_gstring->str .