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<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.1.2//EN"
"http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd">
<refentry id="libgimpbase-gimpunit">
<refmeta>
<refentrytitle role="top_of_page" id="libgimpbase-gimpunit.top_of_page">gimpunit</refentrytitle>
<manvolnum>3</manvolnum>
<refmiscinfo>LIBGIMPBASE Library</refmiscinfo>
</refmeta>
<refnamediv>
<refname>gimpunit</refname>
<refpurpose>Provides a collection of predefined units and functions for creating
user-defined units.</refpurpose>
<!--[<xref linkend="desc" endterm="desc.title"/>]-->
</refnamediv>
<refsynopsisdiv id="libgimpbase-gimpunit.synopsis" role="synopsis">
<title role="synopsis.title">Synopsis</title>
<synopsis>
enum <link linkend="GimpUnit">GimpUnit</link>;
<link linkend="gint">gint</link> <link linkend="gimp-unit-get-number-of-units">gimp_unit_get_number_of_units</link> (void);
<link linkend="gint">gint</link> <link linkend="gimp-unit-get-number-of-built-in-units">gimp_unit_get_number_of_built_in_units</link>
(void);
<link linkend="GimpUnit">GimpUnit</link> <link linkend="gimp-unit-new">gimp_unit_new</link> (<link linkend="gchar">gchar</link> *identifier,
<link linkend="gdouble">gdouble</link> factor,
<link linkend="gint">gint</link> digits,
<link linkend="gchar">gchar</link> *symbol,
<link linkend="gchar">gchar</link> *abbreviation,
<link linkend="gchar">gchar</link> *singular,
<link linkend="gchar">gchar</link> *plural);
<link linkend="gboolean">gboolean</link> <link linkend="gimp-unit-get-deletion-flag">gimp_unit_get_deletion_flag</link> (<link linkend="GimpUnit">GimpUnit</link> unit);
<link linkend="void">void</link> <link linkend="gimp-unit-set-deletion-flag">gimp_unit_set_deletion_flag</link> (<link linkend="GimpUnit">GimpUnit</link> unit,
<link linkend="gboolean">gboolean</link> deletion_flag);
<link linkend="gdouble">gdouble</link> <link linkend="gimp-unit-get-factor">gimp_unit_get_factor</link> (<link linkend="GimpUnit">GimpUnit</link> unit);
<link linkend="gint">gint</link> <link linkend="gimp-unit-get-digits">gimp_unit_get_digits</link> (<link linkend="GimpUnit">GimpUnit</link> unit);
const <link linkend="gchar">gchar</link>* <link linkend="gimp-unit-get-identifier">gimp_unit_get_identifier</link> (<link linkend="GimpUnit">GimpUnit</link> unit);
const <link linkend="gchar">gchar</link>* <link linkend="gimp-unit-get-symbol">gimp_unit_get_symbol</link> (<link linkend="GimpUnit">GimpUnit</link> unit);
const <link linkend="gchar">gchar</link>* <link linkend="gimp-unit-get-abbreviation">gimp_unit_get_abbreviation</link> (<link linkend="GimpUnit">GimpUnit</link> unit);
const <link linkend="gchar">gchar</link>* <link linkend="gimp-unit-get-singular">gimp_unit_get_singular</link> (<link linkend="GimpUnit">GimpUnit</link> unit);
const <link linkend="gchar">gchar</link>* <link linkend="gimp-unit-get-plural">gimp_unit_get_plural</link> (<link linkend="GimpUnit">GimpUnit</link> unit);
#define <link linkend="GIMP-TYPE-UNIT:CAPS">GIMP_TYPE_UNIT</link>
#define <link linkend="GIMP-TYPE-PARAM-UNIT:CAPS">GIMP_TYPE_PARAM_UNIT</link>
#define <link linkend="GIMP-IS-PARAM-SPEC-UNIT:CAPS">GIMP_IS_PARAM_SPEC_UNIT</link> (pspec)
<link linkend="GParamSpec">GParamSpec</link>* <link linkend="gimp-param-spec-unit">gimp_param_spec_unit</link> (const <link linkend="gchar">gchar</link> *name,
const <link linkend="gchar">gchar</link> *nick,
const <link linkend="gchar">gchar</link> *blurb,
<link linkend="gboolean">gboolean</link> allow_pixels,
<link linkend="gboolean">gboolean</link> allow_percent,
<link linkend="GimpUnit">GimpUnit</link> default_value,
<link linkend="GParamFlags">GParamFlags</link> flags);
#define <link linkend="GIMP-VALUE-HOLDS-UNIT:CAPS">GIMP_VALUE_HOLDS_UNIT</link> (value)
</synopsis>
</refsynopsisdiv>
<refsect1 id="libgimpbase-gimpunit.description" role="desc">
<title role="desc.title">Description</title>
<para>
Provides a collection of predefined units and functions for creating
user-defined units.
</para>
</refsect1>
<refsect1 id="libgimpbase-gimpunit.details" role="details">
<title role="details.title">Details</title>
<refsect2 id="GimpUnit" role="enum">
<title>enum GimpUnit</title>
<indexterm zone="GimpUnit"><primary>GimpUnit</primary></indexterm><programlisting>typedef enum /*< skip >*/
{
GIMP_UNIT_PIXEL = 0,
GIMP_UNIT_INCH = 1,
GIMP_UNIT_MM = 2,
GIMP_UNIT_POINT = 3,
GIMP_UNIT_PICA = 4,
GIMP_UNIT_END = 5,
GIMP_UNIT_PERCENT = 65536 /*< pdb-skip >*/
} GimpUnit;
</programlisting>
<para>
</para></refsect2>
<refsect2 id="gimp-unit-get-number-of-units" role="function">
<title>gimp_unit_get_number_of_units ()</title>
<indexterm zone="gimp-unit-get-number-of-units"><primary>gimp_unit_get_number_of_units</primary></indexterm><programlisting><link linkend="gint">gint</link> gimp_unit_get_number_of_units (void);</programlisting>
<para>
Returns the number of units which are known to the <link linkend="GimpUnit"><type>GimpUnit</type></link> system.</para>
<para>
</para><variablelist role="params">
<varlistentry><term><emphasis>Returns</emphasis> :</term><listitem><simpara> The number of defined units.
</simpara></listitem></varlistentry>
</variablelist></refsect2>
<refsect2 id="gimp-unit-get-number-of-built-in-units" role="function">
<title>gimp_unit_get_number_of_built_in_units ()</title>
<indexterm zone="gimp-unit-get-number-of-built-in-units"><primary>gimp_unit_get_number_of_built_in_units</primary></indexterm><programlisting><link linkend="gint">gint</link> gimp_unit_get_number_of_built_in_units
(void);</programlisting>
<para>
Returns the number of <link linkend="GimpUnit"><type>GimpUnit</type></link>'s which are hardcoded in the unit system
(UNIT_INCH, UNIT_MM, UNIT_POINT, UNIT_PICA and the two "pseudo unit"
UNIT_PIXEL).</para>
<para>
</para><variablelist role="params">
<varlistentry><term><emphasis>Returns</emphasis> :</term><listitem><simpara> The number of built-in units.
</simpara></listitem></varlistentry>
</variablelist></refsect2>
<refsect2 id="gimp-unit-new" role="function">
<title>gimp_unit_new ()</title>
<indexterm zone="gimp-unit-new"><primary>gimp_unit_new</primary></indexterm><programlisting><link linkend="GimpUnit">GimpUnit</link> gimp_unit_new (<link linkend="gchar">gchar</link> *identifier,
<link linkend="gdouble">gdouble</link> factor,
<link linkend="gint">gint</link> digits,
<link linkend="gchar">gchar</link> *symbol,
<link linkend="gchar">gchar</link> *abbreviation,
<link linkend="gchar">gchar</link> *singular,
<link linkend="gchar">gchar</link> *plural);</programlisting>
<para>
Returns the integer ID of the new <link linkend="GimpUnit"><type>GimpUnit</type></link>.
</para>
<para>
Note that a new unit is always created with it's deletion flag
set to <link linkend="TRUE:CAPS"><literal>TRUE</literal></link>. You will have to set it to <link linkend="FALSE:CAPS"><literal>FALSE</literal></link> with
<link linkend="gimp-unit-set-deletion-flag"><function>gimp_unit_set_deletion_flag()</function></link> to make the unit definition persistent.</para>
<para>
</para><variablelist role="params">
<varlistentry><term><parameter>identifier</parameter> :</term>
<listitem><simpara> The unit's identifier string.
</simpara></listitem></varlistentry>
<varlistentry><term><parameter>factor</parameter> :</term>
<listitem><simpara> The unit's factor (how many units are in one inch).
</simpara></listitem></varlistentry>
<varlistentry><term><parameter>digits</parameter> :</term>
<listitem><simpara> The unit's suggested number of digits (see <link linkend="gimp-unit-get-digits"><function>gimp_unit_get_digits()</function></link>).
</simpara></listitem></varlistentry>
<varlistentry><term><parameter>symbol</parameter> :</term>
<listitem><simpara> The symbol of the unit (e.g. "''" for inch).
</simpara></listitem></varlistentry>
<varlistentry><term><parameter>abbreviation</parameter> :</term>
<listitem><simpara> The abbreviation of the unit.
</simpara></listitem></varlistentry>
<varlistentry><term><parameter>singular</parameter> :</term>
<listitem><simpara> The singular form of the unit.
</simpara></listitem></varlistentry>
<varlistentry><term><parameter>plural</parameter> :</term>
<listitem><simpara> The plural form of the unit.
</simpara></listitem></varlistentry>
<varlistentry><term><emphasis>Returns</emphasis> :</term><listitem><simpara> The ID of the new unit.
</simpara></listitem></varlistentry>
</variablelist></refsect2>
<refsect2 id="gimp-unit-get-deletion-flag" role="function">
<title>gimp_unit_get_deletion_flag ()</title>
<indexterm zone="gimp-unit-get-deletion-flag"><primary>gimp_unit_get_deletion_flag</primary></indexterm><programlisting><link linkend="gboolean">gboolean</link> gimp_unit_get_deletion_flag (<link linkend="GimpUnit">GimpUnit</link> unit);</programlisting>
<para>
</para>
<para>
</para><variablelist role="params">
<varlistentry><term><parameter>unit</parameter> :</term>
<listitem><simpara> The unit you want to know the <parameter>deletion_flag</parameter> of.
</simpara></listitem></varlistentry>
<varlistentry><term><emphasis>Returns</emphasis> :</term><listitem><simpara> The unit's <parameter>deletion_flag</parameter>.
</simpara></listitem></varlistentry>
</variablelist></refsect2>
<refsect2 id="gimp-unit-set-deletion-flag" role="function">
<title>gimp_unit_set_deletion_flag ()</title>
<indexterm zone="gimp-unit-set-deletion-flag"><primary>gimp_unit_set_deletion_flag</primary></indexterm><programlisting><link linkend="void">void</link> gimp_unit_set_deletion_flag (<link linkend="GimpUnit">GimpUnit</link> unit,
<link linkend="gboolean">gboolean</link> deletion_flag);</programlisting>
<para>
Sets a <link linkend="GimpUnit"><type>GimpUnit</type></link>'s <parameter>deletion_flag</parameter>. If the <parameter>deletion_flag</parameter> of a unit is
<link linkend="TRUE:CAPS"><literal>TRUE</literal></link> when GIMP exits, this unit will not be saved in the users's
"unitrc" file.
</para>
<para>
Trying to change the <parameter>deletion_flag</parameter> of a built-in unit will be silently
ignored.</para>
<para>
</para><variablelist role="params">
<varlistentry><term><parameter>unit</parameter> :</term>
<listitem><simpara> The unit you want to set the <parameter>deletion_flag</parameter> for.
</simpara></listitem></varlistentry>
<varlistentry><term><parameter>deletion_flag</parameter> :</term>
<listitem><simpara> The new deletion_flag.
</simpara></listitem></varlistentry>
</variablelist></refsect2>
<refsect2 id="gimp-unit-get-factor" role="function">
<title>gimp_unit_get_factor ()</title>
<indexterm zone="gimp-unit-get-factor"><primary>gimp_unit_get_factor</primary></indexterm><programlisting><link linkend="gdouble">gdouble</link> gimp_unit_get_factor (<link linkend="GimpUnit">GimpUnit</link> unit);</programlisting>
<para>
A <link linkend="GimpUnit"><type>GimpUnit</type></link>'s <parameter>factor</parameter> is defined to be:
</para>
<para>
distance_in_units == (<parameter>factor</parameter> * distance_in_inches)
</para>
<para>
Returns 0 for <parameter>unit</parameter> == GIMP_UNIT_PIXEL.</para>
<para>
</para><variablelist role="params">
<varlistentry><term><parameter>unit</parameter> :</term>
<listitem><simpara> The unit you want to know the factor of.
</simpara></listitem></varlistentry>
<varlistentry><term><emphasis>Returns</emphasis> :</term><listitem><simpara> The unit's factor.
</simpara></listitem></varlistentry>
</variablelist></refsect2>
<refsect2 id="gimp-unit-get-digits" role="function">
<title>gimp_unit_get_digits ()</title>
<indexterm zone="gimp-unit-get-digits"><primary>gimp_unit_get_digits</primary></indexterm><programlisting><link linkend="gint">gint</link> gimp_unit_get_digits (<link linkend="GimpUnit">GimpUnit</link> unit);</programlisting>
<para>
Returns the number of digits an entry field should provide to get
approximately the same accuracy as an inch input field with two digits.
</para>
<para>
Returns 0 for <parameter>unit</parameter> == GIMP_UNIT_PIXEL.</para>
<para>
</para><variablelist role="params">
<varlistentry><term><parameter>unit</parameter> :</term>
<listitem><simpara> The unit you want to know the digits.
</simpara></listitem></varlistentry>
<varlistentry><term><emphasis>Returns</emphasis> :</term><listitem><simpara> The suggested number of digits.
</simpara></listitem></varlistentry>
</variablelist></refsect2>
<refsect2 id="gimp-unit-get-identifier" role="function">
<title>gimp_unit_get_identifier ()</title>
<indexterm zone="gimp-unit-get-identifier"><primary>gimp_unit_get_identifier</primary></indexterm><programlisting>const <link linkend="gchar">gchar</link>* gimp_unit_get_identifier (<link linkend="GimpUnit">GimpUnit</link> unit);</programlisting>
<para>
This is an unstranslated string and must not be changed or freed.</para>
<para>
</para><variablelist role="params">
<varlistentry><term><parameter>unit</parameter> :</term>
<listitem><simpara> The unit you want to know the identifier of.
</simpara></listitem></varlistentry>
<varlistentry><term><emphasis>Returns</emphasis> :</term><listitem><simpara> The unit's identifier.
</simpara></listitem></varlistentry>
</variablelist></refsect2>
<refsect2 id="gimp-unit-get-symbol" role="function">
<title>gimp_unit_get_symbol ()</title>
<indexterm zone="gimp-unit-get-symbol"><primary>gimp_unit_get_symbol</primary></indexterm><programlisting>const <link linkend="gchar">gchar</link>* gimp_unit_get_symbol (<link linkend="GimpUnit">GimpUnit</link> unit);</programlisting>
<para>
This is e.g. "''" for UNIT_INCH.
</para>
<para>
NOTE: This string must not be changed or freed.</para>
<para>
</para><variablelist role="params">
<varlistentry><term><parameter>unit</parameter> :</term>
<listitem><simpara> The unit you want to know the symbol of.
</simpara></listitem></varlistentry>
<varlistentry><term><emphasis>Returns</emphasis> :</term><listitem><simpara> The unit's symbol.
</simpara></listitem></varlistentry>
</variablelist></refsect2>
<refsect2 id="gimp-unit-get-abbreviation" role="function">
<title>gimp_unit_get_abbreviation ()</title>
<indexterm zone="gimp-unit-get-abbreviation"><primary>gimp_unit_get_abbreviation</primary></indexterm><programlisting>const <link linkend="gchar">gchar</link>* gimp_unit_get_abbreviation (<link linkend="GimpUnit">GimpUnit</link> unit);</programlisting>
<para>
For built-in units, this function returns the translated abbreviation
of the unit.
</para>
<para>
NOTE: This string must not be changed or freed.</para>
<para>
</para><variablelist role="params">
<varlistentry><term><parameter>unit</parameter> :</term>
<listitem><simpara> The unit you want to know the abbreviation of.
</simpara></listitem></varlistentry>
<varlistentry><term><emphasis>Returns</emphasis> :</term><listitem><simpara> The unit's abbreviation.
</simpara></listitem></varlistentry>
</variablelist></refsect2>
<refsect2 id="gimp-unit-get-singular" role="function">
<title>gimp_unit_get_singular ()</title>
<indexterm zone="gimp-unit-get-singular"><primary>gimp_unit_get_singular</primary></indexterm><programlisting>const <link linkend="gchar">gchar</link>* gimp_unit_get_singular (<link linkend="GimpUnit">GimpUnit</link> unit);</programlisting>
<para>
For built-in units, this function returns the translated singular form
of the unit's name.
</para>
<para>
NOTE: This string must not be changed or freed.</para>
<para>
</para><variablelist role="params">
<varlistentry><term><parameter>unit</parameter> :</term>
<listitem><simpara> The unit you want to know the singular form of.
</simpara></listitem></varlistentry>
<varlistentry><term><emphasis>Returns</emphasis> :</term><listitem><simpara> The unit's singular form.
</simpara></listitem></varlistentry>
</variablelist></refsect2>
<refsect2 id="gimp-unit-get-plural" role="function">
<title>gimp_unit_get_plural ()</title>
<indexterm zone="gimp-unit-get-plural"><primary>gimp_unit_get_plural</primary></indexterm><programlisting>const <link linkend="gchar">gchar</link>* gimp_unit_get_plural (<link linkend="GimpUnit">GimpUnit</link> unit);</programlisting>
<para>
For built-in units, this function returns the translated plural form
of the unit's name.
</para>
<para>
NOTE: This string must not be changed or freed.</para>
<para>
</para><variablelist role="params">
<varlistentry><term><parameter>unit</parameter> :</term>
<listitem><simpara> The unit you want to know the plural form of.
</simpara></listitem></varlistentry>
<varlistentry><term><emphasis>Returns</emphasis> :</term><listitem><simpara> The unit's plural form.
</simpara></listitem></varlistentry>
</variablelist></refsect2>
<refsect2 id="GIMP-TYPE-UNIT:CAPS" role="macro">
<title>GIMP_TYPE_UNIT</title>
<indexterm zone="GIMP-TYPE-UNIT:CAPS"><primary>GIMP_TYPE_UNIT</primary></indexterm><programlisting>#define GIMP_TYPE_UNIT (gimp_unit_get_type ())
</programlisting>
<para>
<link linkend="GIMP-TYPE-UNIT:CAPS"><type>GIMP_TYPE_UNIT</type></link> is a <link linkend="GType"><type>GType</type></link> derived from <link linkend="G-TYPE-INT:CAPS"><type>G_TYPE_INT</type></link>.
</para></refsect2>
<refsect2 id="GIMP-TYPE-PARAM-UNIT:CAPS" role="macro">
<title>GIMP_TYPE_PARAM_UNIT</title>
<indexterm zone="GIMP-TYPE-PARAM-UNIT:CAPS"><primary>GIMP_TYPE_PARAM_UNIT</primary></indexterm><programlisting>#define GIMP_TYPE_PARAM_UNIT (gimp_param_unit_get_type ())
</programlisting>
<para>
</para></refsect2>
<refsect2 id="GIMP-IS-PARAM-SPEC-UNIT:CAPS" role="macro">
<title>GIMP_IS_PARAM_SPEC_UNIT()</title>
<indexterm zone="GIMP-IS-PARAM-SPEC-UNIT:CAPS"><primary>GIMP_IS_PARAM_SPEC_UNIT</primary></indexterm><programlisting>#define GIMP_IS_PARAM_SPEC_UNIT(pspec) (G_TYPE_CHECK_INSTANCE_TYPE ((pspec), GIMP_TYPE_PARAM_UNIT))
</programlisting>
<para>
</para><variablelist role="params">
<varlistentry><term><parameter>pspec</parameter> :</term>
<listitem><simpara>
</simpara></listitem></varlistentry>
</variablelist></refsect2>
<refsect2 id="gimp-param-spec-unit" role="function" condition="since:GIMP 2.4">
<title>gimp_param_spec_unit ()</title>
<indexterm zone="gimp-param-spec-unit" role="GIMP 2.4"><primary>gimp_param_spec_unit</primary></indexterm><programlisting><link linkend="GParamSpec">GParamSpec</link>* gimp_param_spec_unit (const <link linkend="gchar">gchar</link> *name,
const <link linkend="gchar">gchar</link> *nick,
const <link linkend="gchar">gchar</link> *blurb,
<link linkend="gboolean">gboolean</link> allow_pixels,
<link linkend="gboolean">gboolean</link> allow_percent,
<link linkend="GimpUnit">GimpUnit</link> default_value,
<link linkend="GParamFlags">GParamFlags</link> flags);</programlisting>
<para>
Creates a param spec to hold a units param.
See <link linkend="g-param-spec-internal"><function>g_param_spec_internal()</function></link> for more information.</para>
<para>
</para><variablelist role="params">
<varlistentry><term><parameter>name</parameter> :</term>
<listitem><simpara> Canonical name of the param
</simpara></listitem></varlistentry>
<varlistentry><term><parameter>nick</parameter> :</term>
<listitem><simpara> Nickname of the param
</simpara></listitem></varlistentry>
<varlistentry><term><parameter>blurb</parameter> :</term>
<listitem><simpara> Brief desciption of param.
</simpara></listitem></varlistentry>
<varlistentry><term><parameter>allow_pixels</parameter> :</term>
<listitem><simpara> Whether "pixels" is an allowed unit.
</simpara></listitem></varlistentry>
<varlistentry><term><parameter>allow_percent</parameter> :</term>
<listitem><simpara> Whether "perecent" is an allowed unit.
</simpara></listitem></varlistentry>
<varlistentry><term><parameter>default_value</parameter> :</term>
<listitem><simpara> Unit to use if none is assigned.
</simpara></listitem></varlistentry>
<varlistentry><term><parameter>flags</parameter> :</term>
<listitem><simpara> a combination of <link linkend="GParamFlags"><type>GParamFlags</type></link>
</simpara></listitem></varlistentry>
<varlistentry><term><emphasis>Returns</emphasis> :</term><listitem><simpara> a newly allocated <link linkend="GParamSpec"><type>GParamSpec</type></link> instance
</simpara></listitem></varlistentry>
</variablelist><para role="since">Since GIMP 2.4
</para></refsect2>
<refsect2 id="GIMP-VALUE-HOLDS-UNIT:CAPS" role="macro">
<title>GIMP_VALUE_HOLDS_UNIT()</title>
<indexterm zone="GIMP-VALUE-HOLDS-UNIT:CAPS"><primary>GIMP_VALUE_HOLDS_UNIT</primary></indexterm><programlisting>#define GIMP_VALUE_HOLDS_UNIT(value) (G_TYPE_CHECK_VALUE_TYPE ((value), GIMP_TYPE_UNIT))
</programlisting>
<para>
</para><variablelist role="params">
<varlistentry><term><parameter>value</parameter> :</term>
<listitem><simpara>
</simpara></listitem></varlistentry>
</variablelist></refsect2>
</refsect1>
<refsect1 id="libgimpbase-gimpunit.see-also">
<title>See Also</title>
<para>
<link linkend="GimpUnitMenu"><type>GimpUnitMenu</type></link>
</para>
<para>
<link linkend="GimpSizeEntry"><type>GimpSizeEntry</type></link>
</para>
</refsect1>
</refentry>
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