GwyGrainValue

GwyGrainValue — Grain value resource type

Functions

GwyGrainValueGroup	gwy_grain_value_get_group ()
const gchar *	gwy_grain_value_get_symbol ()
void	gwy_grain_value_set_symbol ()
const gchar *	gwy_grain_value_get_symbol_markup ()
void	gwy_grain_value_set_symbol_markup ()
gint	gwy_grain_value_get_power_xy ()
void	gwy_grain_value_set_power_xy ()
gint	gwy_grain_value_get_power_z ()
void	gwy_grain_value_set_power_z ()
GwyGrainValueFlags	gwy_grain_value_get_flags ()
void	gwy_grain_value_set_flags ()
GwyGrainQuantity	gwy_grain_value_get_quantity ()
const gchar *	gwy_grain_value_get_expression ()
gboolean	gwy_grain_value_set_expression ()
const gchar *	gwy_grain_value_group_name ()
GwyInventory *	gwy_grain_values ()
GwyGrainValue *	gwy_grain_values_get_grain_value ()
GwyGrainValue *	gwy_grain_values_get_grain_value_by_symbol ()
GwyGrainValue *	gwy_grain_values_get_builtin_grain_value ()
void	gwy_grain_values_calculate ()

Types and Values

enum	GwyGrainValueGroup
enum	GwyGrainValueFlags
	GwyGrainValueData
struct	GwyGrainValue
struct	GwyGrainValueClass

Object Hierarchy

    GObject
    ╰── GwyResource
        ╰── GwyGrainValue

Includes

#include <libprocess/gwyprocess.h>

Description

Functions

gwy_grain_value_get_group ()

GwyGrainValueGroup
gwy_grain_value_get_group (GwyGrainValue *gvalue);

Gets the group of a grain value.

All user-defined grain values belong to GWY_GRAIN_VALUE_GROUP_USER group, built-in grain values belong to other groups.

Parameters

gvalue

A grain value object.

Returns

The group of gvalue .

Since: 2.8

gwy_grain_value_get_symbol ()

const gchar *
gwy_grain_value_get_symbol (GwyGrainValue *gvalue);

Gets the plain symbol representing a grain value.

The plain symbol is used in expressions. It has to be a valid identifier and it should be easy to type. (Note currently it is not possible to use user-defined grain quantities in expressions for other user-defined grain quantities.)

Parameters

gvalue

A grain value object.

Returns

Plain symbol of gvalue , owned by gvalue .

Since: 2.8

gwy_grain_value_set_symbol ()

void
gwy_grain_value_set_symbol (GwyGrainValue *gvalue,
                            const gchar *symbol);

Sets the plain symbol representing a grain value.

See gwy_grain_value_get_symbol() for details.

Parameters

gvalue	A grain value object.
symbol	The new symbol.

Since: 2.8

gwy_grain_value_get_symbol_markup ()

const gchar *
gwy_grain_value_get_symbol_markup (GwyGrainValue *gvalue);

Gets the rich text symbol representing a grain value.

The returned value can contain Pango markup and is suitable for instance for graph axis labels.

Parameters

gvalue

A grain value object.

Returns

Rich text symbol of gvalue , owned by gvalue .

Since: 2.8

gwy_grain_value_set_symbol_markup ()

void
gwy_grain_value_set_symbol_markup (GwyGrainValue *gvalue,
                                   const gchar *symbol);

Sets the rich text symbol representing a grain value.

See gwy_grain_value_get_symbol_markup() for details.

Parameters

gvalue	A grain value object.
symbol	The new symbol.

Since: 2.8

gwy_grain_value_get_power_xy ()

gint
gwy_grain_value_get_power_xy (GwyGrainValue *gvalue);

Gets the power of lateral dimensions in a grain value.

The units of a grain value are determined as the product of lateral units and value units, raised to certain powers. For instance lengths in the horizontal plane have xy power of 1 and areas have 2, whereas volumes have xy power of 2 and value power of 1.

Parameters

gvalue

A grain value object.

Returns

The power of lateral dimensions.

Since: 2.8

gwy_grain_value_set_power_xy ()

void
gwy_grain_value_set_power_xy (GwyGrainValue *gvalue,
                              gint power_xy);

Sets the power of lateral dimensions in a grain value.

Parameters

gvalue	A grain value object.
power_xy	The new lateral dimensions power.

Since: 2.8

gwy_grain_value_get_power_z ()

gint
gwy_grain_value_get_power_z (GwyGrainValue *gvalue);

Gets the power of value (height) in a grain value.

See gwy_grain_value_get_power_xy() for details.

Parameters

gvalue

A grain value object.

Returns

The power of value (height).

Since: 2.8

gwy_grain_value_set_power_z ()

void
gwy_grain_value_set_power_z (GwyGrainValue *gvalue,
                             gint power_z);

Sets the power of value (height) in a grain value.

Parameters

gvalue	A grain value object.
power_z	The new value (height) power.

Since: 2.8

gwy_grain_value_get_flags ()

GwyGrainValueFlags
gwy_grain_value_get_flags (GwyGrainValue *gvalue);

Obtains the special attributes of a grain quantity.

Parameters

gvalue

A grain value object.

Returns

The special attribute flags set on gvalue . See GwyGrainValueFlags for their description.

Since: 2.8

gwy_grain_value_set_flags ()

void
gwy_grain_value_set_flags (GwyGrainValue *gvalue,
                           GwyGrainValueFlags flags);

Sets the special attributes of a grain quantity.

The value of flags determines the complete new set of flags. To set individual flags, obtain the current set with gwy_grain_value_get_flags() first and then set/unset individual flags.

Parameters

gvalue	A grain value object.
flags	The special attributes to set on gvalue .

Since: 2.8

gwy_grain_value_get_quantity ()

GwyGrainQuantity
gwy_grain_value_get_quantity (GwyGrainValue *gvalue);

Gets the built-in grain quantity corresponding to a grain value.

Parameters

gvalue

A grain value object.

Returns

The corresponding built-in GwyGrainQuantity if gvalue is a built-it grain value, -1 if gvalue is an user-defined grain value.

Since: 2.8

gwy_grain_value_get_expression ()

const gchar *
gwy_grain_value_get_expression (GwyGrainValue *gvalue);

Gets the expression of a user-defined grain value.

Parameters

gvalue

A grain value object.

Returns

The expression as a string owned by gvalue , NULL if gvalue is a built-in grain value.

Since: 2.8

gwy_grain_value_set_expression ()

gboolean
gwy_grain_value_set_expression (GwyGrainValue *gvalue,
                                const gchar *expression,
                                GError **error);

Sets the expression of a user-defined grain value.

It is an error to call this function on a built-in quantity.

Parameters

gvalue	A grain value object.
expression	New grain value expression.
error	Return location for the error, or NULL to ignore errors.

Returns

TRUE if the expression is compilable and references only known grain quantities. FALSE is the expression is not calculable, in this case the gvalue 's expression is unchanged.

Since: 2.8

gwy_grain_value_group_name ()

const gchar *
gwy_grain_value_group_name (GwyGrainValueGroup group);

Obtains the name of a grain value group.

Parameters

group

Grain value group.

Returns

The grain value group name as a constant untranslated string, owned by the library.

Since: 2.8

gwy_grain_values ()

GwyInventory *
gwy_grain_values (void);

Gets the inventory with all the grain values.

Returns

Grain value inventory.

Since: 2.8

gwy_grain_values_get_grain_value ()

GwyGrainValue *
gwy_grain_values_get_grain_value (const gchar *name);

Convenience function to get a grain quantity from gwy_grain_values() by name.

Parameters

name

Grain quantity name.

Returns

Grain quantity identified by name or NULL if there is no such grain quantity.

Since: 2.8

gwy_grain_values_get_grain_value_by_symbol ()

GwyGrainValue *
gwy_grain_values_get_grain_value_by_symbol
                               (const gchar *symbol);

Convenience function to get a grain quantity from gwy_grain_values() by its symbol.

Parameters

symbol

Grain quantity symbol.

Returns

Grain quantity with smybol symbol or NULL if there is no such grain quantity.

Since: 2.37

gwy_grain_values_get_builtin_grain_value ()

GwyGrainValue *
gwy_grain_values_get_builtin_grain_value
                               (GwyGrainQuantity quantity);

Obtains the built-in grain value corresponding to given enum value.

Parameters

quantity

A GwyGrainQuantity value.

Returns

The built-in grain value corresponding to quantity , NULL if there is no such grain value.

Since: 2.8

gwy_grain_values_calculate ()

void
gwy_grain_values_calculate (gint nvalues,
                            GwyGrainValue **gvalues,
                            gdouble **results,
                            GwyDataField *data_field,
                            gint ngrains,
                            const gint *grains);

Calculates a set of grain values.

See also gwy_data_field_grains_get_quantities() for a simplier function for built-in grain values.

Parameters

nvalues	Number of items in gvalues .
gvalues	Array of grain value objects.
results	Array of length nvalues of arrays of length ngrains +1 of doubles to put the calculated values to.
data_field	Data field used for marking. For some values its values are not used, but its dimensions determine the dimensions of grains .
grains	Grain numbers filled with gwy_data_field_number_grains().
ngrains	The number of grains as returned by gwy_data_field_number_grains().

Since: 2.8

Types and Values

enum GwyGrainValueGroup

Members

GWY_GRAIN_VALUE_GROUP_ID
GWY_GRAIN_VALUE_GROUP_POSITION
GWY_GRAIN_VALUE_GROUP_VALUE
GWY_GRAIN_VALUE_GROUP_AREA
GWY_GRAIN_VALUE_GROUP_VOLUME
GWY_GRAIN_VALUE_GROUP_BOUNDARY
GWY_GRAIN_VALUE_GROUP_SLOPE
GWY_GRAIN_VALUE_GROUP_CURVATURE
GWY_GRAIN_VALUE_GROUP_MOMENT
GWY_GRAIN_VALUE_GROUP_USER

enum GwyGrainValueFlags

Special attributes of grain values.

Members

GWY_GRAIN_VALUE_SAME_UNITS	Certain grain quantities, such as the surface area or absolute inclination, are only meaningful if value (height) is the same physical quantity as lateral dimensions. These have this flag set to TRUE.
GWY_GRAIN_VALUE_IS_ANGLE	Angular quantities are internally always calculated in radians, however they can be presented in degrees in the user interface. To enable such special handling, set this flag to TRUE.

Since: 2.8

GwyGrainValueData

typedef struct {
    GwyGrainValueGroup group;
    gchar *symbol_markup;
    gchar *symbol;
    gchar *reserveds;
    gint power_xy;
    gint power_z;
    guint flags;
    gint reservedi;
} GwyGrainValueData;

struct GwyGrainValue

struct GwyGrainValue;

struct GwyGrainValueClass

struct GwyGrainValueClass {
    GwyResourceClass parent_class;

    void (*reserved1)(void);
    void (*reserved2)(void);
};